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-rw-r--r--src/tmpfiles/meson.build12
-rw-r--r--src/tmpfiles/offline-passwd.c162
-rw-r--r--src/tmpfiles/offline-passwd.h9
-rw-r--r--src/tmpfiles/test-offline-passwd.c85
-rw-r--r--src/tmpfiles/tmpfiles.c4228
5 files changed, 4496 insertions, 0 deletions
diff --git a/src/tmpfiles/meson.build b/src/tmpfiles/meson.build
new file mode 100644
index 0000000..cfa3d37
--- /dev/null
+++ b/src/tmpfiles/meson.build
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+systemd_tmpfiles_sources = files(
+ 'tmpfiles.c',
+ 'offline-passwd.c',
+ 'offline-passwd.h')
+
+tests += [
+ [files('test-offline-passwd.c',
+ 'offline-passwd.c',
+ 'offline-passwd.h')],
+]
diff --git a/src/tmpfiles/offline-passwd.c b/src/tmpfiles/offline-passwd.c
new file mode 100644
index 0000000..c847266
--- /dev/null
+++ b/src/tmpfiles/offline-passwd.c
@@ -0,0 +1,162 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "chase-symlinks.h"
+#include "fd-util.h"
+#include "offline-passwd.h"
+#include "path-util.h"
+#include "user-util.h"
+
+DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR(uid_gid_hash_ops, char, string_hash_func, string_compare_func, free);
+
+static int open_passwd_file(const char *root, const char *fname, FILE **ret_file) {
+ _cleanup_free_ char *p = NULL;
+ _cleanup_close_ int fd = -1;
+
+ fd = chase_symlinks_and_open(fname, root, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC, &p);
+ if (fd < 0)
+ return fd;
+
+ FILE *f = fdopen(fd, "r");
+ if (!f)
+ return -errno;
+
+ TAKE_FD(fd);
+
+ log_debug("Reading %s entries from %s...", basename(fname), p);
+
+ *ret_file = f;
+ return 0;
+}
+
+static int populate_uid_cache(const char *root, Hashmap **ret) {
+ _cleanup_(hashmap_freep) Hashmap *cache = NULL;
+ int r;
+
+ cache = hashmap_new(&uid_gid_hash_ops);
+ if (!cache)
+ return -ENOMEM;
+
+ /* The directory list is hardcoded here: /etc is the standard, and rpm-ostree uses /usr/lib. This
+ * could be made configurable, but I don't see the point right now. */
+
+ FOREACH_STRING(fname, "/etc/passwd", "/usr/lib/passwd") {
+ _cleanup_fclose_ FILE *f = NULL;
+
+ r = open_passwd_file(root, fname, &f);
+ if (r == -ENOENT)
+ continue;
+ if (r < 0)
+ return r;
+
+ struct passwd *pw;
+ while ((r = fgetpwent_sane(f, &pw)) > 0) {
+ _cleanup_free_ char *n = NULL;
+
+ n = strdup(pw->pw_name);
+ if (!n)
+ return -ENOMEM;
+
+ r = hashmap_put(cache, n, UID_TO_PTR(pw->pw_uid));
+ if (IN_SET(r, 0 -EEXIST))
+ continue;
+ if (r < 0)
+ return r;
+ TAKE_PTR(n);
+ }
+ }
+
+ *ret = TAKE_PTR(cache);
+ return 0;
+}
+
+static int populate_gid_cache(const char *root, Hashmap **ret) {
+ _cleanup_(hashmap_freep) Hashmap *cache = NULL;
+ int r;
+
+ cache = hashmap_new(&uid_gid_hash_ops);
+ if (!cache)
+ return -ENOMEM;
+
+ FOREACH_STRING(fname, "/etc/group", "/usr/lib/group") {
+ _cleanup_fclose_ FILE *f = NULL;
+
+ r = open_passwd_file(root, fname, &f);
+ if (r == -ENOENT)
+ continue;
+ if (r < 0)
+ return r;
+
+ struct group *gr;
+ while ((r = fgetgrent_sane(f, &gr)) > 0) {
+ _cleanup_free_ char *n = NULL;
+
+ n = strdup(gr->gr_name);
+ if (!n)
+ return -ENOMEM;
+
+ r = hashmap_put(cache, n, GID_TO_PTR(gr->gr_gid));
+ if (IN_SET(r, 0, -EEXIST))
+ continue;
+ if (r < 0)
+ return r;
+ TAKE_PTR(n);
+ }
+ }
+
+ *ret = TAKE_PTR(cache);
+ return 0;
+}
+
+int name_to_uid_offline(
+ const char *root,
+ const char *user,
+ uid_t *ret_uid,
+ Hashmap **cache) {
+
+ void *found;
+ int r;
+
+ assert(user);
+ assert(ret_uid);
+ assert(cache);
+
+ if (!*cache) {
+ r = populate_uid_cache(root, cache);
+ if (r < 0)
+ return r;
+ }
+
+ found = hashmap_get(*cache, user);
+ if (!found)
+ return -ESRCH;
+
+ *ret_uid = PTR_TO_UID(found);
+ return 0;
+}
+
+int name_to_gid_offline(
+ const char *root,
+ const char *group,
+ gid_t *ret_gid,
+ Hashmap **cache) {
+
+ void *found;
+ int r;
+
+ assert(group);
+ assert(ret_gid);
+ assert(cache);
+
+ if (!*cache) {
+ r = populate_gid_cache(root, cache);
+ if (r < 0)
+ return r;
+ }
+
+ found = hashmap_get(*cache, group);
+ if (!found)
+ return -ESRCH;
+
+ *ret_gid = PTR_TO_GID(found);
+ return 0;
+}
diff --git a/src/tmpfiles/offline-passwd.h b/src/tmpfiles/offline-passwd.h
new file mode 100644
index 0000000..587af7b
--- /dev/null
+++ b/src/tmpfiles/offline-passwd.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <sys/types.h>
+
+#include "hashmap.h"
+
+int name_to_uid_offline(const char *root, const char *user, uid_t *ret_uid, Hashmap **cache);
+int name_to_gid_offline(const char *root, const char *group, gid_t *ret_gid, Hashmap **cache);
diff --git a/src/tmpfiles/test-offline-passwd.c b/src/tmpfiles/test-offline-passwd.c
new file mode 100644
index 0000000..b70cef4
--- /dev/null
+++ b/src/tmpfiles/test-offline-passwd.c
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <getopt.h>
+
+#include "offline-passwd.h"
+#include "user-util.h"
+#include "format-util.h"
+#include "tests.h"
+
+static char *arg_root = NULL;
+
+static void test_resolve_one(const char *name) {
+ bool relaxed = name || arg_root;
+
+ if (!name)
+ name = "root";
+
+ log_info("/* %s(\"%s\") */", __func__, name);
+
+ _cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
+ uid_t uid = UID_INVALID;
+ gid_t gid = GID_INVALID;
+ int r;
+
+ r = name_to_uid_offline(arg_root, name, &uid, &uid_cache);
+ log_info_errno(r, "name_to_uid_offline: %s → "UID_FMT": %m", name, uid);
+ assert_se(relaxed || r == 0);
+
+ r = name_to_uid_offline(arg_root, name, &uid, &uid_cache);
+ log_info_errno(r, "name_to_uid_offline: %s → "UID_FMT": %m", name, uid);
+ assert_se(relaxed || r == 0);
+
+ r = name_to_gid_offline(arg_root, name, &gid, &gid_cache);
+ log_info_errno(r, "name_to_gid_offline: %s → "GID_FMT": %m", name, gid);
+ assert_se(relaxed || r == 0);
+
+ r = name_to_gid_offline(arg_root, name, &gid, &gid_cache);
+ log_info_errno(r, "name_to_gid_offline: %s → "GID_FMT": %m", name, gid);
+ assert_se(relaxed || r == 0);
+}
+
+static int parse_argv(int argc, char *argv[]) {
+ static const struct option options[] = {
+ { "root", required_argument, NULL, 'r' },
+ {}
+ };
+
+ int c;
+
+ assert_se(argc >= 0);
+ assert_se(argv);
+
+ while ((c = getopt_long(argc, argv, "r:", options, NULL)) >= 0)
+ switch (c) {
+ case 'r':
+ arg_root = optarg;
+ break;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached();
+ }
+
+ return 0;
+}
+
+int main(int argc, char **argv) {
+ int r;
+
+ test_setup_logging(LOG_DEBUG);
+
+ r = parse_argv(argc, argv);
+ if (r < 0)
+ return r;
+
+ if (optind >= argc)
+ test_resolve_one(NULL);
+ else
+ while (optind < argc)
+ test_resolve_one(argv[optind++]);
+
+ return 0;
+}
diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c
new file mode 100644
index 0000000..9c3d994
--- /dev/null
+++ b/src/tmpfiles/tmpfiles.c
@@ -0,0 +1,4228 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <fnmatch.h>
+#include <getopt.h>
+#include <limits.h>
+#include <linux/fs.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <sys/file.h>
+#include <sys/xattr.h>
+#include <sysexits.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "sd-path.h"
+
+#include "acl-util.h"
+#include "alloc-util.h"
+#include "btrfs-util.h"
+#include "capability-util.h"
+#include "chase-symlinks.h"
+#include "chattr-util.h"
+#include "conf-files.h"
+#include "copy.h"
+#include "creds-util.h"
+#include "def.h"
+#include "devnum-util.h"
+#include "dirent-util.h"
+#include "dissect-image.h"
+#include "env-util.h"
+#include "errno-util.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "format-util.h"
+#include "fs-util.h"
+#include "glob-util.h"
+#include "hexdecoct.h"
+#include "io-util.h"
+#include "label.h"
+#include "log.h"
+#include "macro.h"
+#include "main-func.h"
+#include "missing_stat.h"
+#include "missing_syscall.h"
+#include "mkdir-label.h"
+#include "mount-util.h"
+#include "mountpoint-util.h"
+#include "offline-passwd.h"
+#include "pager.h"
+#include "parse-argument.h"
+#include "parse-util.h"
+#include "path-lookup.h"
+#include "path-util.h"
+#include "pretty-print.h"
+#include "rlimit-util.h"
+#include "rm-rf.h"
+#include "selinux-util.h"
+#include "set.h"
+#include "sort-util.h"
+#include "specifier.h"
+#include "stdio-util.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "terminal-util.h"
+#include "umask-util.h"
+#include "user-util.h"
+#include "virt.h"
+
+/* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
+ * them in the file system. This is intended to be used to create
+ * properly owned directories beneath /tmp, /var/tmp, /run, which are
+ * volatile and hence need to be recreated on bootup. */
+
+typedef enum OperationMask {
+ OPERATION_CREATE = 1 << 0,
+ OPERATION_REMOVE = 1 << 1,
+ OPERATION_CLEAN = 1 << 2,
+} OperationMask;
+
+typedef enum ItemType {
+ /* These ones take file names */
+ CREATE_FILE = 'f',
+ TRUNCATE_FILE = 'F', /* deprecated: use f+ */
+ CREATE_DIRECTORY = 'd',
+ TRUNCATE_DIRECTORY = 'D',
+ CREATE_SUBVOLUME = 'v',
+ CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
+ CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
+ CREATE_FIFO = 'p',
+ CREATE_SYMLINK = 'L',
+ CREATE_CHAR_DEVICE = 'c',
+ CREATE_BLOCK_DEVICE = 'b',
+ COPY_FILES = 'C',
+
+ /* These ones take globs */
+ WRITE_FILE = 'w',
+ EMPTY_DIRECTORY = 'e',
+ SET_XATTR = 't',
+ RECURSIVE_SET_XATTR = 'T',
+ SET_ACL = 'a',
+ RECURSIVE_SET_ACL = 'A',
+ SET_ATTRIBUTE = 'h',
+ RECURSIVE_SET_ATTRIBUTE = 'H',
+ IGNORE_PATH = 'x',
+ IGNORE_DIRECTORY_PATH = 'X',
+ REMOVE_PATH = 'r',
+ RECURSIVE_REMOVE_PATH = 'R',
+ RELABEL_PATH = 'z',
+ RECURSIVE_RELABEL_PATH = 'Z',
+ ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
+} ItemType;
+
+typedef enum AgeBy {
+ AGE_BY_ATIME = 1 << 0,
+ AGE_BY_BTIME = 1 << 1,
+ AGE_BY_CTIME = 1 << 2,
+ AGE_BY_MTIME = 1 << 3,
+
+ /* All file timestamp types are checked by default. */
+ AGE_BY_DEFAULT_FILE = AGE_BY_ATIME | AGE_BY_BTIME | AGE_BY_CTIME | AGE_BY_MTIME,
+ AGE_BY_DEFAULT_DIR = AGE_BY_ATIME | AGE_BY_BTIME | AGE_BY_MTIME
+} AgeBy;
+
+typedef struct Item {
+ ItemType type;
+
+ char *path;
+ char *argument;
+ void *binary_argument; /* set if binary data, in which case it takes precedence over 'argument' */
+ size_t binary_argument_size;
+ char **xattrs;
+#if HAVE_ACL
+ acl_t acl_access;
+ acl_t acl_default;
+#endif
+ uid_t uid;
+ gid_t gid;
+ mode_t mode;
+ usec_t age;
+ AgeBy age_by_file, age_by_dir;
+
+ dev_t major_minor;
+ unsigned attribute_value;
+ unsigned attribute_mask;
+
+ bool uid_set:1;
+ bool gid_set:1;
+ bool mode_set:1;
+ bool uid_only_create:1;
+ bool gid_only_create:1;
+ bool mode_only_create:1;
+ bool age_set:1;
+ bool mask_perms:1;
+ bool attribute_set:1;
+
+ bool keep_first_level:1;
+
+ bool append_or_force:1;
+
+ bool allow_failure:1;
+
+ bool try_replace:1;
+
+ OperationMask done;
+} Item;
+
+typedef struct ItemArray {
+ Item *items;
+ size_t n_items;
+
+ struct ItemArray *parent;
+ Set *children;
+} ItemArray;
+
+typedef enum DirectoryType {
+ DIRECTORY_RUNTIME,
+ DIRECTORY_STATE,
+ DIRECTORY_CACHE,
+ DIRECTORY_LOGS,
+ _DIRECTORY_TYPE_MAX,
+} DirectoryType;
+
+typedef enum {
+ CREATION_NORMAL,
+ CREATION_EXISTING,
+ CREATION_FORCE,
+ _CREATION_MODE_MAX,
+ _CREATION_MODE_INVALID = -EINVAL,
+} CreationMode;
+
+static bool arg_cat_config = false;
+static bool arg_user = false;
+static OperationMask arg_operation = 0;
+static bool arg_boot = false;
+static PagerFlags arg_pager_flags = 0;
+
+static char **arg_include_prefixes = NULL;
+static char **arg_exclude_prefixes = NULL;
+static char *arg_root = NULL;
+static char *arg_image = NULL;
+static char *arg_replace = NULL;
+
+#define MAX_DEPTH 256
+
+static OrderedHashmap *items = NULL, *globs = NULL;
+static Set *unix_sockets = NULL;
+
+STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
+STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
+STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_freep);
+STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
+STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
+STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
+STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
+
+static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
+ [CREATION_NORMAL] = "Created",
+ [CREATION_EXISTING] = "Found existing",
+ [CREATION_FORCE] = "Created replacement",
+};
+
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
+
+/* Different kinds of errors that mean that information is not available in the environment. */
+static inline bool ERRNO_IS_NOINFO(int r) {
+ return IN_SET(abs(r),
+ EUNATCH, /* os-release or machine-id missing */
+ ENOMEDIUM, /* machine-id or another file empty */
+ ENOPKG, /* machine-id is uninitialized */
+ ENXIO); /* env var is unset */
+}
+
+static int specifier_directory(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
+ struct table_entry {
+ uint64_t type;
+ const char *suffix;
+ };
+
+ static const struct table_entry paths_system[] = {
+ [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
+ [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
+ [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
+ [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
+ };
+
+ static const struct table_entry paths_user[] = {
+ [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
+ [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
+ [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
+ [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
+ };
+
+ const struct table_entry *paths;
+ _cleanup_free_ char *p = NULL;
+ unsigned i;
+ int r;
+
+ assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
+ paths = arg_user ? paths_user : paths_system;
+
+ i = PTR_TO_UINT(data);
+ assert(i < ELEMENTSOF(paths_system));
+
+ r = sd_path_lookup(paths[i].type, paths[i].suffix, &p);
+ if (r < 0)
+ return r;
+
+ if (arg_root) {
+ _cleanup_free_ char *j = NULL;
+
+ j = path_join(arg_root, p);
+ if (!j)
+ return -ENOMEM;
+
+ *ret = TAKE_PTR(j);
+ } else
+ *ret = TAKE_PTR(p);
+
+ return 0;
+}
+
+static int log_unresolvable_specifier(const char *filename, unsigned line) {
+ static bool notified = false;
+
+ /* In system mode, this is called when /etc is not fully initialized and some specifiers are
+ * unresolvable. In user mode, this is called when some variables are not defined. These cases are
+ * not considered a fatal error, so log at LOG_NOTICE only for the first time and then downgrade this
+ * to LOG_DEBUG for the rest.
+ *
+ * If we're running in a chroot (--root was used or sd_booted() reports that systemd is not running),
+ * always use LOG_DEBUG. We may be called to initialize a chroot before booting and there is no
+ * expectation that machine-id and other files will be populated.
+ */
+
+ int log_level = notified || arg_root || running_in_chroot() > 0 ?
+ LOG_DEBUG : LOG_NOTICE;
+
+ log_syntax(NULL,
+ log_level,
+ filename, line, 0,
+ "Failed to resolve specifier: %s, skipping.",
+ arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc/ detected");
+
+ if (!notified)
+ log_full(log_level,
+ "All rules containing unresolvable specifiers will be skipped.");
+
+ notified = true;
+ return 0;
+}
+
+static int user_config_paths(char*** ret) {
+ _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
+ _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
+ _cleanup_strv_free_ char **res = NULL;
+ int r;
+
+ r = xdg_user_dirs(&config_dirs, &data_dirs);
+ if (r < 0)
+ return r;
+
+ r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
+ if (r < 0 && !ERRNO_IS_NOINFO(r))
+ return r;
+
+ r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
+ if (r < 0 && !ERRNO_IS_NOINFO(r))
+ return r;
+
+ r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
+ if (r < 0 && !ERRNO_IS_NOINFO(r))
+ return r;
+
+ r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
+ if (r < 0)
+ return r;
+
+ r = strv_extend(&res, persistent_config);
+ if (r < 0)
+ return r;
+
+ r = strv_extend(&res, runtime_config);
+ if (r < 0)
+ return r;
+
+ r = strv_extend(&res, data_home);
+ if (r < 0)
+ return r;
+
+ r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
+ if (r < 0)
+ return r;
+
+ r = path_strv_make_absolute_cwd(res);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(res);
+ return 0;
+}
+
+static bool needs_glob(ItemType t) {
+ return IN_SET(t,
+ WRITE_FILE,
+ IGNORE_PATH,
+ IGNORE_DIRECTORY_PATH,
+ REMOVE_PATH,
+ RECURSIVE_REMOVE_PATH,
+ EMPTY_DIRECTORY,
+ ADJUST_MODE,
+ RELABEL_PATH,
+ RECURSIVE_RELABEL_PATH,
+ SET_XATTR,
+ RECURSIVE_SET_XATTR,
+ SET_ACL,
+ RECURSIVE_SET_ACL,
+ SET_ATTRIBUTE,
+ RECURSIVE_SET_ATTRIBUTE);
+}
+
+static bool takes_ownership(ItemType t) {
+ return IN_SET(t,
+ CREATE_FILE,
+ TRUNCATE_FILE,
+ CREATE_DIRECTORY,
+ EMPTY_DIRECTORY,
+ TRUNCATE_DIRECTORY,
+ CREATE_SUBVOLUME,
+ CREATE_SUBVOLUME_INHERIT_QUOTA,
+ CREATE_SUBVOLUME_NEW_QUOTA,
+ CREATE_FIFO,
+ CREATE_SYMLINK,
+ CREATE_CHAR_DEVICE,
+ CREATE_BLOCK_DEVICE,
+ COPY_FILES,
+ WRITE_FILE,
+ IGNORE_PATH,
+ IGNORE_DIRECTORY_PATH,
+ REMOVE_PATH,
+ RECURSIVE_REMOVE_PATH);
+}
+
+static struct Item* find_glob(OrderedHashmap *h, const char *match) {
+ ItemArray *j;
+
+ ORDERED_HASHMAP_FOREACH(j, h) {
+ size_t n;
+
+ for (n = 0; n < j->n_items; n++) {
+ Item *item = j->items + n;
+
+ if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
+ return item;
+ }
+ }
+
+ return NULL;
+}
+
+static int load_unix_sockets(void) {
+ _cleanup_set_free_ Set *sockets = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ int r;
+
+ if (unix_sockets)
+ return 0;
+
+ /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
+
+ f = fopen("/proc/net/unix", "re");
+ if (!f)
+ return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
+ "Failed to open /proc/net/unix, ignoring: %m");
+
+ /* Skip header */
+ r = read_line(f, LONG_LINE_MAX, NULL);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
+ if (r == 0)
+ return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
+
+ for (;;) {
+ _cleanup_free_ char *line = NULL;
+ char *p;
+
+ r = read_line(f, LONG_LINE_MAX, &line);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
+ if (r == 0) /* EOF */
+ break;
+
+ p = strchr(line, ':');
+ if (!p)
+ continue;
+
+ if (strlen(p) < 37)
+ continue;
+
+ p += 37;
+ p += strspn(p, WHITESPACE);
+ p += strcspn(p, WHITESPACE); /* skip one more word */
+ p += strspn(p, WHITESPACE);
+
+ if (!path_is_absolute(p))
+ continue;
+
+ r = set_put_strdup_full(&sockets, &path_hash_ops_free, p);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
+ }
+
+ unix_sockets = TAKE_PTR(sockets);
+ return 1;
+}
+
+static bool unix_socket_alive(const char *fn) {
+ assert(fn);
+
+ if (load_unix_sockets() < 0)
+ return true; /* We don't know, so assume yes */
+
+ return set_contains(unix_sockets, fn);
+}
+
+/* Accessors for the argument in binary format */
+static const void* item_binary_argument(const Item *i) {
+ assert(i);
+ return i->binary_argument ?: i->argument;
+}
+
+static size_t item_binary_argument_size(const Item *i) {
+ assert(i);
+ return i->binary_argument ? i->binary_argument_size : strlen_ptr(i->argument);
+}
+
+static DIR* xopendirat_nomod(int dirfd, const char *path) {
+ DIR *dir;
+
+ dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
+ if (dir)
+ return dir;
+
+ log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
+ if (errno != EPERM)
+ return NULL;
+
+ dir = xopendirat(dirfd, path, O_NOFOLLOW);
+ if (!dir)
+ log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
+
+ return dir;
+}
+
+static DIR* opendir_nomod(const char *path) {
+ return xopendirat_nomod(AT_FDCWD, path);
+}
+
+static inline nsec_t load_statx_timestamp_nsec(const struct statx_timestamp *ts) {
+ assert(ts);
+
+ if (ts->tv_sec < 0)
+ return NSEC_INFINITY;
+
+ if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC)
+ return NSEC_INFINITY;
+
+ return ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec;
+}
+
+static bool needs_cleanup(
+ nsec_t atime,
+ nsec_t btime,
+ nsec_t ctime,
+ nsec_t mtime,
+ nsec_t cutoff,
+ const char *sub_path,
+ AgeBy age_by,
+ bool is_dir) {
+
+ if (FLAGS_SET(age_by, AGE_BY_MTIME) && mtime != NSEC_INFINITY && mtime >= cutoff) {
+ /* Follows spelling in stat(1). */
+ log_debug("%s \"%s\": modify time %s is too new.",
+ is_dir ? "Directory" : "File",
+ sub_path,
+ FORMAT_TIMESTAMP_STYLE(mtime / NSEC_PER_USEC, TIMESTAMP_US));
+
+ return false;
+ }
+
+ if (FLAGS_SET(age_by, AGE_BY_ATIME) && atime != NSEC_INFINITY && atime >= cutoff) {
+ log_debug("%s \"%s\": access time %s is too new.",
+ is_dir ? "Directory" : "File",
+ sub_path,
+ FORMAT_TIMESTAMP_STYLE(atime / NSEC_PER_USEC, TIMESTAMP_US));
+
+ return false;
+ }
+
+ /*
+ * Note: Unless explicitly specified by the user, "ctime" is ignored
+ * by default for directories, because we change it when deleting.
+ */
+ if (FLAGS_SET(age_by, AGE_BY_CTIME) && ctime != NSEC_INFINITY && ctime >= cutoff) {
+ log_debug("%s \"%s\": change time %s is too new.",
+ is_dir ? "Directory" : "File",
+ sub_path,
+ FORMAT_TIMESTAMP_STYLE(ctime / NSEC_PER_USEC, TIMESTAMP_US));
+
+ return false;
+ }
+
+ if (FLAGS_SET(age_by, AGE_BY_BTIME) && btime != NSEC_INFINITY && btime >= cutoff) {
+ log_debug("%s \"%s\": birth time %s is too new.",
+ is_dir ? "Directory" : "File",
+ sub_path,
+ FORMAT_TIMESTAMP_STYLE(btime / NSEC_PER_USEC, TIMESTAMP_US));
+
+ return false;
+ }
+
+ return true;
+}
+
+static int dir_cleanup(
+ Item *i,
+ const char *p,
+ DIR *d,
+ nsec_t self_atime_nsec,
+ nsec_t self_mtime_nsec,
+ nsec_t cutoff_nsec,
+ dev_t rootdev_major,
+ dev_t rootdev_minor,
+ bool mountpoint,
+ int maxdepth,
+ bool keep_this_level,
+ AgeBy age_by_file,
+ AgeBy age_by_dir) {
+
+ bool deleted = false;
+ int r = 0;
+
+ FOREACH_DIRENT_ALL(de, d, break) {
+ _cleanup_free_ char *sub_path = NULL;
+ nsec_t atime_nsec, mtime_nsec, ctime_nsec, btime_nsec;
+
+ if (dot_or_dot_dot(de->d_name))
+ continue;
+
+ /* If statx() is supported, use it. It's preferable over fstatat() since it tells us
+ * explicitly where we are looking at a mount point, for free as side information. Determining
+ * the same information without statx() is hard, see the complexity of path_is_mount_point(),
+ * and also much slower as it requires a number of syscalls instead of just one. Hence, when
+ * we have modern statx() we use it instead of fstat() and do proper mount point checks,
+ * while on older kernels's well do traditional st_dev based detection of mount points.
+ *
+ * Using statx() for detecting mount points also has the benfit that we handle weird file
+ * systems such as overlayfs better where each file is originating from a different
+ * st_dev. */
+
+ STRUCT_STATX_DEFINE(sx);
+
+ r = statx_fallback(
+ dirfd(d), de->d_name,
+ AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT,
+ STATX_TYPE|STATX_MODE|STATX_UID|STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_BTIME,
+ &sx);
+ if (r == -ENOENT)
+ continue;
+ if (r < 0) {
+ /* FUSE, NFS mounts, SELinux might return EACCES */
+ r = log_full_errno(r == -EACCES ? LOG_DEBUG : LOG_ERR, r,
+ "statx(%s/%s) failed: %m", p, de->d_name);
+ continue;
+ }
+
+ if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) {
+ /* Yay, we have the mount point API, use it */
+ if (FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT)) {
+ log_debug("Ignoring \"%s/%s\": different mount points.", p, de->d_name);
+ continue;
+ }
+ } else {
+ /* So we might have statx() but the STATX_ATTR_MOUNT_ROOT flag is not supported, fall
+ * back to traditional stx_dev checking. */
+ if (sx.stx_dev_major != rootdev_major ||
+ sx.stx_dev_minor != rootdev_minor) {
+ log_debug("Ignoring \"%s/%s\": different filesystem.", p, de->d_name);
+ continue;
+ }
+
+ /* Try to detect bind mounts of the same filesystem instance; they do not differ in device
+ * major/minors. This type of query is not supported on all kernels or filesystem types
+ * though. */
+ if (S_ISDIR(sx.stx_mode)) {
+ int q;
+
+ q = fd_is_mount_point(dirfd(d), de->d_name, 0);
+ if (q < 0)
+ log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, de->d_name);
+ else if (q > 0) {
+ log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, de->d_name);
+ continue;
+ }
+ }
+ }
+
+ atime_nsec = FLAGS_SET(sx.stx_mask, STATX_ATIME) ? load_statx_timestamp_nsec(&sx.stx_atime) : 0;
+ mtime_nsec = FLAGS_SET(sx.stx_mask, STATX_MTIME) ? load_statx_timestamp_nsec(&sx.stx_mtime) : 0;
+ ctime_nsec = FLAGS_SET(sx.stx_mask, STATX_CTIME) ? load_statx_timestamp_nsec(&sx.stx_ctime) : 0;
+ btime_nsec = FLAGS_SET(sx.stx_mask, STATX_BTIME) ? load_statx_timestamp_nsec(&sx.stx_btime) : 0;
+
+ sub_path = path_join(p, de->d_name);
+ if (!sub_path) {
+ r = log_oom();
+ goto finish;
+ }
+
+ /* Is there an item configured for this path? */
+ if (ordered_hashmap_get(items, sub_path)) {
+ log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
+ continue;
+ }
+
+ if (find_glob(globs, sub_path)) {
+ log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
+ continue;
+ }
+
+ if (S_ISDIR(sx.stx_mode)) {
+ _cleanup_closedir_ DIR *sub_dir = NULL;
+
+ if (mountpoint &&
+ streq(de->d_name, "lost+found") &&
+ sx.stx_uid == 0) {
+ log_debug("Ignoring directory \"%s\".", sub_path);
+ continue;
+ }
+
+ if (maxdepth <= 0)
+ log_warning("Reached max depth on \"%s\".", sub_path);
+ else {
+ int q;
+
+ sub_dir = xopendirat_nomod(dirfd(d), de->d_name);
+ if (!sub_dir) {
+ if (errno != ENOENT)
+ r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
+
+ continue;
+ }
+
+ if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
+ log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
+ continue;
+ }
+
+ q = dir_cleanup(i,
+ sub_path, sub_dir,
+ atime_nsec, mtime_nsec, cutoff_nsec,
+ rootdev_major, rootdev_minor,
+ false, maxdepth-1, false,
+ age_by_file, age_by_dir);
+ if (q < 0)
+ r = q;
+ }
+
+ /* Note: if you are wondering why we don't support the sticky bit for excluding
+ * directories from cleaning like we do it for other file system objects: well, the
+ * sticky bit already has a meaning for directories, so we don't want to overload
+ * that. */
+
+ if (keep_this_level) {
+ log_debug("Keeping directory \"%s\".", sub_path);
+ continue;
+ }
+
+ /*
+ * Check the file timestamps of an entry against the
+ * given cutoff time; delete if it is older.
+ */
+ if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec,
+ cutoff_nsec, sub_path, age_by_dir, true))
+ continue;
+
+ log_debug("Removing directory \"%s\".", sub_path);
+ if (unlinkat(dirfd(d), de->d_name, AT_REMOVEDIR) < 0)
+ if (!IN_SET(errno, ENOENT, ENOTEMPTY))
+ r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
+
+ } else {
+ /* Skip files for which the sticky bit is set. These are semantics we define, and are
+ * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
+ if (sx.stx_mode & S_ISVTX) {
+ log_debug("Skipping \"%s\": sticky bit set.", sub_path);
+ continue;
+ }
+
+ if (mountpoint &&
+ S_ISREG(sx.stx_mode) &&
+ sx.stx_uid == 0 &&
+ STR_IN_SET(de->d_name,
+ ".journal",
+ "aquota.user",
+ "aquota.group")) {
+ log_debug("Skipping \"%s\".", sub_path);
+ continue;
+ }
+
+ /* Ignore sockets that are listed in /proc/net/unix */
+ if (S_ISSOCK(sx.stx_mode) && unix_socket_alive(sub_path)) {
+ log_debug("Skipping \"%s\": live socket.", sub_path);
+ continue;
+ }
+
+ /* Ignore device nodes */
+ if (S_ISCHR(sx.stx_mode) || S_ISBLK(sx.stx_mode)) {
+ log_debug("Skipping \"%s\": a device.", sub_path);
+ continue;
+ }
+
+ /* Keep files on this level around if this is requested */
+ if (keep_this_level) {
+ log_debug("Keeping \"%s\".", sub_path);
+ continue;
+ }
+
+ if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec,
+ cutoff_nsec, sub_path, age_by_file, false))
+ continue;
+
+ log_debug("Removing \"%s\".", sub_path);
+ if (unlinkat(dirfd(d), de->d_name, 0) < 0)
+ if (errno != ENOENT)
+ r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
+
+ deleted = true;
+ }
+ }
+
+finish:
+ if (deleted) {
+ struct timespec ts[2];
+
+ log_debug("Restoring access and modification time on \"%s\": %s, %s",
+ p,
+ FORMAT_TIMESTAMP_STYLE(self_atime_nsec / NSEC_PER_USEC, TIMESTAMP_US),
+ FORMAT_TIMESTAMP_STYLE(self_mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
+
+ timespec_store_nsec(ts + 0, self_atime_nsec);
+ timespec_store_nsec(ts + 1, self_mtime_nsec);
+
+ /* Restore original directory timestamps */
+ if (futimens(dirfd(d), ts) < 0)
+ log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
+ }
+
+ return r;
+}
+
+static bool dangerous_hardlinks(void) {
+ _cleanup_free_ char *value = NULL;
+ static int cached = -1;
+ int r;
+
+ /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
+ * what the upstream default is. */
+
+ if (cached >= 0)
+ return cached;
+
+ r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
+ if (r < 0) {
+ log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
+ return true;
+ }
+
+ r = parse_boolean(value);
+ if (r < 0) {
+ log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
+ return true;
+ }
+
+ cached = r == 0;
+ return cached;
+}
+
+static bool hardlink_vulnerable(const struct stat *st) {
+ assert(st);
+
+ return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
+}
+
+static mode_t process_mask_perms(mode_t mode, mode_t current) {
+
+ if ((current & 0111) == 0)
+ mode &= ~0111;
+ if ((current & 0222) == 0)
+ mode &= ~0222;
+ if ((current & 0444) == 0)
+ mode &= ~0444;
+ if (!S_ISDIR(current))
+ mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
+
+ return mode;
+}
+
+static int fd_set_perms(
+ Item *i,
+ int fd,
+ const char *path,
+ const struct stat *st,
+ CreationMode creation) {
+
+ bool do_chown, do_chmod;
+ struct stat stbuf;
+ mode_t new_mode;
+ uid_t new_uid;
+ gid_t new_gid;
+ int r;
+
+ assert(i);
+ assert(fd >= 0);
+ assert(path);
+
+ if (!i->mode_set && !i->uid_set && !i->gid_set)
+ goto shortcut;
+
+ if (!st) {
+ if (fstat(fd, &stbuf) < 0)
+ return log_error_errno(errno, "fstat(%s) failed: %m", path);
+ st = &stbuf;
+ }
+
+ if (hardlink_vulnerable(st))
+ return log_error_errno(SYNTHETIC_ERRNO(EPERM),
+ "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
+ path);
+ new_uid = i->uid_set && (creation != CREATION_EXISTING || !i->uid_only_create) ? i->uid : st->st_uid;
+ new_gid = i->gid_set && (creation != CREATION_EXISTING || !i->gid_only_create) ? i->gid : st->st_gid;
+
+ /* Do we need a chown()? */
+ do_chown = (new_uid != st->st_uid) || (new_gid != st->st_gid);
+
+ /* Calculate the mode to apply */
+ new_mode = i->mode_set && (creation != CREATION_EXISTING || !i->mode_only_create) ?
+ (i->mask_perms ? process_mask_perms(i->mode, st->st_mode) : i->mode) :
+ (st->st_mode & 07777);
+
+ do_chmod = ((new_mode ^ st->st_mode) & 07777) != 0;
+
+ if (do_chmod && do_chown) {
+ /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
+ * the new mode. That way there's no time window where the file exists under the old owner
+ * with more than the old access modes — and not under the new owner with more than the new
+ * access modes either. */
+
+ if (S_ISLNK(st->st_mode))
+ log_debug("Skipping temporary mode fix for symlink %s.", path);
+ else {
+ mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
+
+ if (((m ^ st->st_mode) & 07777) == 0)
+ log_debug("\"%s\" matches temporary mode %o already.", path, m);
+ else {
+ log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
+ r = fchmod_opath(fd, m);
+ if (r < 0)
+ return log_error_errno(r, "fchmod() of %s failed: %m", path);
+ }
+ }
+ }
+
+ if (do_chown) {
+ log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT, path, new_uid, new_gid);
+
+ if (fchownat(fd, "",
+ new_uid != st->st_uid ? new_uid : UID_INVALID,
+ new_gid != st->st_gid ? new_gid : GID_INVALID,
+ AT_EMPTY_PATH) < 0)
+ return log_error_errno(errno, "fchownat() of %s failed: %m", path);
+ }
+
+ /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
+ * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
+ if (do_chmod || do_chown) {
+ if (S_ISLNK(st->st_mode))
+ log_debug("Skipping mode fix for symlink %s.", path);
+ else {
+ log_debug("Changing \"%s\" to mode %o.", path, new_mode);
+ r = fchmod_opath(fd, new_mode);
+ if (r < 0)
+ return log_error_errno(r, "fchmod() of %s failed: %m", path);
+ }
+ }
+
+shortcut:
+ return label_fix_full(fd, /* inode_path= */ NULL, /* label_path= */ path, 0);
+}
+
+static int path_open_parent_safe(const char *path, bool allow_failure) {
+ _cleanup_free_ char *dn = NULL;
+ int r, fd;
+
+ if (!path_is_normalized(path))
+ return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
+ SYNTHETIC_ERRNO(EINVAL),
+ "Failed to open parent of '%s': path not normalized%s.",
+ path,
+ allow_failure ? ", ignoring" : "");
+
+ r = path_extract_directory(path, &dn);
+ if (r < 0)
+ return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
+ r,
+ "Unable to determine parent directory of '%s'%s: %m",
+ path,
+ allow_failure ? ", ignoring" : "");
+
+ r = chase_symlinks(dn, arg_root, allow_failure ? CHASE_SAFE : CHASE_SAFE|CHASE_WARN, NULL, &fd);
+ if (r == -ENOLINK) /* Unsafe symlink: already covered by CHASE_WARN */
+ return r;
+ if (r < 0)
+ return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
+ r,
+ "Failed to open path '%s'%s: %m",
+ dn,
+ allow_failure ? ", ignoring" : "");
+
+ return fd;
+}
+
+static int path_open_safe(const char *path) {
+ int r, fd;
+
+ /* path_open_safe() returns a file descriptor opened with O_PATH after
+ * verifying that the path doesn't contain unsafe transitions, except
+ * for its final component as the function does not follow symlink. */
+
+ assert(path);
+
+ if (!path_is_normalized(path))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to open invalid path '%s'.", path);
+
+ r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
+ if (r == -ENOLINK)
+ return r; /* Unsafe symlink: already covered by CHASE_WARN */
+ if (r < 0)
+ return log_error_errno(r, "Failed to open path %s: %m", path);
+
+ return fd;
+}
+
+static int path_set_perms(
+ Item *i,
+ const char *path,
+ CreationMode creation) {
+
+ _cleanup_close_ int fd = -1;
+
+ assert(i);
+ assert(path);
+
+ fd = path_open_safe(path);
+ if (fd < 0)
+ return fd;
+
+ return fd_set_perms(i, fd, path, /* st= */ NULL, creation);
+}
+
+static int parse_xattrs_from_arg(Item *i) {
+ const char *p;
+ int r;
+
+ assert(i);
+
+ assert_se(p = i->argument);
+ for (;;) {
+ _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
+
+ r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
+ if (r < 0)
+ log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
+ if (r <= 0)
+ break;
+
+ r = split_pair(xattr, "=", &name, &value);
+ if (r < 0) {
+ log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
+ continue;
+ }
+
+ if (isempty(name) || isempty(value)) {
+ log_warning("Malformed extended attribute found, ignoring: %s", xattr);
+ continue;
+ }
+
+ if (strv_push_pair(&i->xattrs, name, value) < 0)
+ return log_oom();
+
+ name = value = NULL;
+ }
+
+ return 0;
+}
+
+static int fd_set_xattrs(
+ Item *i,
+ int fd,
+ const char *path,
+ const struct stat *st,
+ CreationMode creation) {
+
+ assert(i);
+ assert(fd >= 0);
+ assert(path);
+
+ STRV_FOREACH_PAIR(name, value, i->xattrs) {
+ log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
+ if (setxattr(FORMAT_PROC_FD_PATH(fd), *name, *value, strlen(*value), 0) < 0)
+ return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
+ *name, *value, path);
+ }
+ return 0;
+}
+
+static int path_set_xattrs(
+ Item *i,
+ const char *path,
+ CreationMode creation) {
+
+ _cleanup_close_ int fd = -1;
+
+ assert(i);
+ assert(path);
+
+ fd = path_open_safe(path);
+ if (fd < 0)
+ return fd;
+
+ return fd_set_xattrs(i, fd, path, /* st = */ NULL, creation);
+}
+
+static int parse_acls_from_arg(Item *item) {
+#if HAVE_ACL
+ int r;
+
+ assert(item);
+
+ /* If append_or_force (= modify) is set, we will not modify the acl
+ * afterwards, so the mask can be added now if necessary. */
+
+ r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
+ if (r < 0)
+ log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
+#else
+ log_warning("ACLs are not supported. Ignoring.");
+#endif
+
+ return 0;
+}
+
+#if HAVE_ACL
+static int path_set_acl(
+ const char *path,
+ const char *pretty,
+ acl_type_t type,
+ acl_t acl,
+ bool modify) {
+
+ _cleanup_(acl_free_charpp) char *t = NULL;
+ _cleanup_(acl_freep) acl_t dup = NULL;
+ int r;
+
+ /* Returns 0 for success, positive error if already warned,
+ * negative error otherwise. */
+
+ if (modify) {
+ r = acls_for_file(path, type, acl, &dup);
+ if (r < 0)
+ return r;
+
+ r = calc_acl_mask_if_needed(&dup);
+ if (r < 0)
+ return r;
+ } else {
+ dup = acl_dup(acl);
+ if (!dup)
+ return -errno;
+
+ /* the mask was already added earlier if needed */
+ }
+
+ r = add_base_acls_if_needed(&dup, path);
+ if (r < 0)
+ return r;
+
+ t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
+ log_debug("Setting %s ACL %s on %s.",
+ type == ACL_TYPE_ACCESS ? "access" : "default",
+ strna(t), pretty);
+
+ r = acl_set_file(path, type, dup);
+ if (r < 0) {
+ if (ERRNO_IS_NOT_SUPPORTED(errno))
+ /* No error if filesystem doesn't support ACLs. Return negative. */
+ return -errno;
+ else
+ /* Return positive to indicate we already warned */
+ return -log_error_errno(errno,
+ "Setting %s ACL \"%s\" on %s failed: %m",
+ type == ACL_TYPE_ACCESS ? "access" : "default",
+ strna(t), pretty);
+ }
+ return 0;
+}
+#endif
+
+static int fd_set_acls(
+ Item *item,
+ int fd,
+ const char *path,
+ const struct stat *st,
+ CreationMode creation) {
+
+ int r = 0;
+#if HAVE_ACL
+ struct stat stbuf;
+
+ assert(item);
+ assert(fd >= 0);
+ assert(path);
+
+ if (!st) {
+ if (fstat(fd, &stbuf) < 0)
+ return log_error_errno(errno, "fstat(%s) failed: %m", path);
+ st = &stbuf;
+ }
+
+ if (hardlink_vulnerable(st))
+ return log_error_errno(SYNTHETIC_ERRNO(EPERM),
+ "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
+ path);
+
+ if (S_ISLNK(st->st_mode)) {
+ log_debug("Skipping ACL fix for symlink %s.", path);
+ return 0;
+ }
+
+ if (item->acl_access)
+ r = path_set_acl(FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
+
+ /* set only default acls to folders */
+ if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
+ r = path_set_acl(FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
+
+ if (ERRNO_IS_NOT_SUPPORTED(r)) {
+ log_debug_errno(r, "ACLs not supported by file system at %s", path);
+ return 0;
+ }
+
+ if (r > 0)
+ return -r; /* already warned */
+
+ /* The above procfs paths don't work if /proc is not mounted. */
+ if (r == -ENOENT && proc_mounted() == 0)
+ r = -ENOSYS;
+
+ if (r < 0)
+ return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
+#endif
+ return r;
+}
+
+static int path_set_acls(Item *item, const char *path, CreationMode creation) {
+ int r = 0;
+#if HAVE_ACL
+ _cleanup_close_ int fd = -1;
+
+ assert(item);
+ assert(path);
+
+ fd = path_open_safe(path);
+ if (fd < 0)
+ return fd;
+
+ r = fd_set_acls(item, fd, path, /* st= */ NULL, creation);
+#endif
+ return r;
+}
+
+static int parse_attribute_from_arg(Item *item) {
+
+ static const struct {
+ char character;
+ unsigned value;
+ } attributes[] = {
+ { 'A', FS_NOATIME_FL }, /* do not update atime */
+ { 'S', FS_SYNC_FL }, /* Synchronous updates */
+ { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
+ { 'a', FS_APPEND_FL }, /* writes to file may only append */
+ { 'c', FS_COMPR_FL }, /* Compress file */
+ { 'd', FS_NODUMP_FL }, /* do not dump file */
+ { 'e', FS_EXTENT_FL }, /* Extents */
+ { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
+ { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
+ { 's', FS_SECRM_FL }, /* Secure deletion */
+ { 'u', FS_UNRM_FL }, /* Undelete */
+ { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
+ { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
+ { 'C', FS_NOCOW_FL }, /* Do not cow file */
+ { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
+ };
+
+ enum {
+ MODE_ADD,
+ MODE_DEL,
+ MODE_SET
+ } mode = MODE_ADD;
+
+ unsigned value = 0, mask = 0;
+ const char *p;
+
+ assert(item);
+
+ p = item->argument;
+ if (p) {
+ if (*p == '+') {
+ mode = MODE_ADD;
+ p++;
+ } else if (*p == '-') {
+ mode = MODE_DEL;
+ p++;
+ } else if (*p == '=') {
+ mode = MODE_SET;
+ p++;
+ }
+ }
+
+ if (isempty(p) && mode != MODE_SET)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Setting file attribute on '%s' needs an attribute specification.",
+ item->path);
+
+ for (; p && *p ; p++) {
+ unsigned i, v;
+
+ for (i = 0; i < ELEMENTSOF(attributes); i++)
+ if (*p == attributes[i].character)
+ break;
+
+ if (i >= ELEMENTSOF(attributes))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Unknown file attribute '%c' on '%s'.",
+ *p, item->path);
+
+ v = attributes[i].value;
+
+ SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
+
+ mask |= v;
+ }
+
+ if (mode == MODE_SET)
+ mask |= CHATTR_ALL_FL;
+
+ assert(mask != 0);
+
+ item->attribute_mask = mask;
+ item->attribute_value = value;
+ item->attribute_set = true;
+
+ return 0;
+}
+
+static int fd_set_attribute(
+ Item *item,
+ int fd,
+ const char *path,
+ const struct stat *st,
+ CreationMode creation) {
+
+ _cleanup_close_ int procfs_fd = -1;
+ struct stat stbuf;
+ unsigned f;
+ int r;
+
+ assert(item);
+ assert(fd >= 0);
+ assert(path);
+
+ if (!item->attribute_set || item->attribute_mask == 0)
+ return 0;
+
+ if (!st) {
+ if (fstat(fd, &stbuf) < 0)
+ return log_error_errno(errno, "fstat(%s) failed: %m", path);
+ st = &stbuf;
+ }
+
+ /* Issuing the file attribute ioctls on device nodes is not safe, as that will be delivered to the
+ * drivers, not the file system containing the device node. */
+ if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
+ path);
+
+ f = item->attribute_value & item->attribute_mask;
+
+ /* Mask away directory-specific flags */
+ if (!S_ISDIR(st->st_mode))
+ f &= ~FS_DIRSYNC_FL;
+
+ procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
+ if (procfs_fd < 0)
+ return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
+
+ unsigned previous, current;
+ r = chattr_full(NULL, procfs_fd, f, item->attribute_mask, &previous, &current, CHATTR_FALLBACK_BITWISE);
+ if (r == -ENOANO)
+ log_warning("Cannot set file attributes for '%s', maybe due to incompatibility in specified attributes, "
+ "previous=0x%08x, current=0x%08x, expected=0x%08x, ignoring.",
+ path, previous, current, (previous & ~item->attribute_mask) | (f & item->attribute_mask));
+ else if (r < 0)
+ log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) ? LOG_DEBUG : LOG_WARNING, r,
+ "Cannot set file attributes for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
+ path, item->attribute_value, item->attribute_mask);
+
+ return 0;
+}
+
+static int path_set_attribute(Item *item, const char *path, CreationMode creation) {
+ _cleanup_close_ int fd = -1;
+
+ if (!item->attribute_set || item->attribute_mask == 0)
+ return 0;
+
+ fd = path_open_safe(path);
+ if (fd < 0)
+ return fd;
+
+ return fd_set_attribute(item, fd, path, /* st= */ NULL, creation);
+}
+
+static int write_argument_data(Item *i, int fd, const char *path) {
+ int r;
+
+ assert(i);
+ assert(fd >= 0);
+ assert(path);
+
+ if (item_binary_argument_size(i) == 0)
+ return 0;
+
+ assert(item_binary_argument(i));
+
+ log_debug("Writing to \"%s\".", path);
+
+ r = loop_write(fd, item_binary_argument(i), item_binary_argument_size(i), /* do_poll= */ false);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write file \"%s\": %m", path);
+
+ return 0;
+}
+
+static int write_one_file(Item *i, const char *path, CreationMode creation) {
+ _cleanup_close_ int fd = -1, dir_fd = -1;
+ _cleanup_free_ char *bn = NULL;
+ int r;
+
+ assert(i);
+ assert(path);
+ assert(i->type == WRITE_FILE);
+
+ r = path_extract_filename(path, &bn);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
+ if (r == O_DIRECTORY)
+ return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for writing, is a directory.", path);
+
+ /* Validate the path and keep the fd on the directory for opening the file so we're sure that it
+ * can't be changed behind our back. */
+ dir_fd = path_open_parent_safe(path, i->allow_failure);
+ if (dir_fd < 0)
+ return dir_fd;
+
+ /* Follows symlinks */
+ fd = openat(dir_fd, bn,
+ O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY|(i->append_or_force ? O_APPEND : 0),
+ i->mode);
+ if (fd < 0) {
+ if (errno == ENOENT) {
+ log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
+ return 0;
+ }
+
+ if (i->allow_failure)
+ return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
+
+ return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
+ }
+
+ /* 'w' is allowed to write into any kind of files. */
+
+ r = write_argument_data(i, fd, path);
+ if (r < 0)
+ return r;
+
+ return fd_set_perms(i, fd, path, NULL, creation);
+}
+
+static int create_file(Item *i, const char *path) {
+ _cleanup_close_ int fd = -1, dir_fd = -1;
+ _cleanup_free_ char *bn = NULL;
+ struct stat stbuf, *st = NULL;
+ CreationMode creation;
+ int r = 0;
+
+ assert(i);
+ assert(path);
+ assert(i->type == CREATE_FILE);
+
+ /* 'f' operates on regular files exclusively. */
+
+ r = path_extract_filename(path, &bn);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
+ if (r == O_DIRECTORY)
+ return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for writing, is a directory.", path);
+
+ /* Validate the path and keep the fd on the directory for opening the file so we're sure that it
+ * can't be changed behind our back. */
+ dir_fd = path_open_parent_safe(path, i->allow_failure);
+ if (dir_fd < 0)
+ return dir_fd;
+
+ RUN_WITH_UMASK(0000) {
+ mac_selinux_create_file_prepare(path, S_IFREG);
+ fd = RET_NERRNO(openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
+ mac_selinux_create_file_clear();
+ }
+
+ if (fd < 0) {
+ /* Even on a read-only filesystem, open(2) returns EEXIST if the file already exists. It
+ * returns EROFS only if it needs to create the file. */
+ if (fd != -EEXIST)
+ return log_error_errno(fd, "Failed to create file %s: %m", path);
+
+ /* Re-open the file. At that point it must exist since open(2) failed with EEXIST. We still
+ * need to check if the perms/mode need to be changed. For read-only filesystems, we let
+ * fd_set_perms() report the error if the perms need to be modified. */
+ fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
+ if (fd < 0)
+ return log_error_errno(errno, "Failed to re-open file %s: %m", path);
+
+ if (fstat(fd, &stbuf) < 0)
+ return log_error_errno(errno, "stat(%s) failed: %m", path);
+
+ if (!S_ISREG(stbuf.st_mode))
+ return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
+ "%s exists and is not a regular file.",
+ path);
+
+ st = &stbuf;
+ creation = CREATION_EXISTING;
+ } else {
+ r = write_argument_data(i, fd, path);
+ if (r < 0)
+ return r;
+
+ creation = CREATION_NORMAL;
+ }
+
+ return fd_set_perms(i, fd, path, st, creation);
+}
+
+static int truncate_file(Item *i, const char *path) {
+ _cleanup_close_ int fd = -1, dir_fd = -1;
+ _cleanup_free_ char *bn = NULL;
+ struct stat stbuf, *st = NULL;
+ CreationMode creation;
+ bool erofs = false;
+ int r = 0;
+
+ assert(i);
+ assert(path);
+ assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
+
+ /* We want to operate on regular file exclusively especially since O_TRUNC is unspecified if the file
+ * is neither a regular file nor a fifo nor a terminal device. Therefore we first open the file and
+ * make sure it's a regular one before truncating it. */
+
+ r = path_extract_filename(path, &bn);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
+ if (r == O_DIRECTORY)
+ return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for truncation, is a directory.", path);
+
+ /* Validate the path and keep the fd on the directory for opening the file so we're sure that it
+ * can't be changed behind our back. */
+ dir_fd = path_open_parent_safe(path, i->allow_failure);
+ if (dir_fd < 0)
+ return dir_fd;
+
+ creation = CREATION_EXISTING;
+ fd = RET_NERRNO(openat(dir_fd, bn, O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
+ if (fd == -ENOENT) {
+ creation = CREATION_NORMAL; /* Didn't work without O_CREATE, try again with */
+
+ RUN_WITH_UMASK(0000) {
+ mac_selinux_create_file_prepare(path, S_IFREG);
+ fd = RET_NERRNO(openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
+ mac_selinux_create_file_clear();
+ }
+ }
+
+ if (fd < 0) {
+ if (fd != -EROFS)
+ return log_error_errno(fd, "Failed to open/create file %s: %m", path);
+
+ /* On a read-only filesystem, we don't want to fail if the target is already empty and the
+ * perms are set. So we still proceed with the sanity checks and let the remaining operations
+ * fail with EROFS if they try to modify the target file. */
+
+ fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
+ if (fd < 0) {
+ if (errno == ENOENT)
+ return log_error_errno(SYNTHETIC_ERRNO(EROFS),
+ "Cannot create file %s on a read-only file system.",
+ path);
+
+ return log_error_errno(errno, "Failed to re-open file %s: %m", path);
+ }
+
+ erofs = true;
+ creation = CREATION_EXISTING;
+ }
+
+ if (fstat(fd, &stbuf) < 0)
+ return log_error_errno(errno, "stat(%s) failed: %m", path);
+
+ if (!S_ISREG(stbuf.st_mode))
+ return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
+ "%s exists and is not a regular file.",
+ path);
+
+ if (stbuf.st_size > 0) {
+ if (ftruncate(fd, 0) < 0) {
+ r = erofs ? -EROFS : -errno;
+ return log_error_errno(r, "Failed to truncate file %s: %m", path);
+ }
+ } else
+ st = &stbuf;
+
+ log_debug("\"%s\" has been created.", path);
+
+ if (item_binary_argument(i)) {
+ r = write_argument_data(i, fd, path);
+ if (r < 0)
+ return r;
+ }
+
+ return fd_set_perms(i, fd, path, st, creation);
+}
+
+static int copy_files(Item *i) {
+ _cleanup_close_ int dfd = -1, fd = -1;
+ _cleanup_free_ char *bn = NULL;
+ struct stat st, a;
+ int r;
+
+ log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
+
+ r = path_extract_filename(i->path, &bn);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
+
+ /* Validate the path and use the returned directory fd for copying the target so we're sure that the
+ * path can't be changed behind our back. */
+ dfd = path_open_parent_safe(i->path, i->allow_failure);
+ if (dfd < 0)
+ return dfd;
+
+ r = copy_tree_at(AT_FDCWD, i->argument,
+ dfd, bn,
+ i->uid_set ? i->uid : UID_INVALID,
+ i->gid_set ? i->gid : GID_INVALID,
+ COPY_REFLINK | COPY_MERGE_EMPTY | COPY_MAC_CREATE | COPY_HARDLINKS);
+
+ fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
+ if (fd < 0) {
+ if (r < 0) /* Look at original error first */
+ return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
+
+ return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
+ }
+
+ if (fstat(fd, &st) < 0)
+ return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
+
+ if (stat(i->argument, &a) < 0)
+ return log_error_errno(errno, "Failed to stat(%s): %m", i->argument);
+
+ if (((st.st_mode ^ a.st_mode) & S_IFMT) != 0) {
+ log_debug("Can't copy to %s, file exists already and is of different type", i->path);
+ return 0;
+ }
+
+ return fd_set_perms(i, fd, i->path, &st, _CREATION_MODE_INVALID);
+}
+
+static int create_directory_or_subvolume(
+ const char *path,
+ mode_t mode,
+ bool subvol,
+ bool allow_failure,
+ struct stat *ret_st,
+ CreationMode *ret_creation) {
+
+ _cleanup_free_ char *bn = NULL;
+ _cleanup_close_ int pfd = -1;
+ CreationMode creation;
+ struct stat st;
+ int r, fd;
+
+ assert(path);
+
+ r = path_extract_filename(path, &bn);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
+
+ pfd = path_open_parent_safe(path, allow_failure);
+ if (pfd < 0)
+ return pfd;
+
+ if (subvol) {
+ r = getenv_bool("SYSTEMD_TMPFILES_FORCE_SUBVOL");
+ if (r < 0) {
+ if (r != -ENXIO) /* env var is unset */
+ log_warning_errno(r, "Cannot parse value of $SYSTEMD_TMPFILES_FORCE_SUBVOL, ignoring.");
+ r = btrfs_is_subvol(empty_to_root(arg_root)) > 0;
+ }
+ if (r == 0)
+ /* Don't create a subvolume unless the root directory is one, too. We do this under
+ * the assumption that if the root directory is just a plain directory (i.e. very
+ * light-weight), we shouldn't try to split it up into subvolumes (i.e. more
+ * heavy-weight). Thus, chroot() environments and suchlike will get a full brtfs
+ * subvolume set up below their tree only if they specifically set up a btrfs
+ * subvolume for the root dir too. */
+
+ subvol = false;
+ else {
+ RUN_WITH_UMASK((~mode) & 0777)
+ r = btrfs_subvol_make_fd(pfd, bn);
+ }
+ } else
+ r = 0;
+
+ if (!subvol || ERRNO_IS_NOT_SUPPORTED(r))
+ RUN_WITH_UMASK(0000)
+ r = mkdirat_label(pfd, bn, mode);
+
+ creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
+
+ fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_DIRECTORY|O_PATH);
+ if (fd < 0) {
+ /* We couldn't open it because it is not actually a directory? */
+ if (errno == ENOTDIR)
+ return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "\"%s\" already exists and is not a directory.", path);
+
+ /* Then look at the original error */
+ if (r < 0)
+ return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
+ r,
+ "Failed to create directory or subvolume \"%s\"%s: %m",
+ path,
+ allow_failure ? ", ignoring" : "");
+
+ return log_error_errno(errno, "Failed to open directory/subvolume we just created '%s': %m", path);
+ }
+
+ if (fstat(fd, &st) < 0)
+ return log_error_errno(errno, "Failed to fstat(%s): %m", path);
+
+ assert(S_ISDIR(st.st_mode)); /* we used O_DIRECTORY above */
+
+ log_debug("%s directory \"%s\".", creation_mode_verb_to_string(creation), path);
+
+ if (ret_st)
+ *ret_st = st;
+ if (ret_creation)
+ *ret_creation = creation;
+
+ return fd;
+}
+
+static int create_directory(Item *i, const char *path) {
+ _cleanup_close_ int fd = -1;
+ CreationMode creation;
+ struct stat st;
+
+ assert(i);
+ assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
+
+ fd = create_directory_or_subvolume(path, i->mode, /* subvol= */ false, i->allow_failure, &st, &creation);
+ if (fd == -EEXIST)
+ return 0;
+ if (fd < 0)
+ return fd;
+
+ return fd_set_perms(i, fd, path, &st, creation);
+}
+
+static int create_subvolume(Item *i, const char *path) {
+ _cleanup_close_ int fd = -1;
+ CreationMode creation;
+ struct stat st;
+ int r, q = 0;
+
+ assert(i);
+ assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
+
+ fd = create_directory_or_subvolume(path, i->mode, /* subvol = */ true, i->allow_failure, &st, &creation);
+ if (fd == -EEXIST)
+ return 0;
+ if (fd < 0)
+ return fd;
+
+ if (creation == CREATION_NORMAL &&
+ IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
+ r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
+ if (r == -ENOTTY)
+ log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
+ else if (r == -EROFS)
+ log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
+ else if (r == -ENOTCONN)
+ log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
+ else if (r < 0)
+ q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
+ else if (r > 0)
+ log_debug("Adjusted quota for subvolume \"%s\".", i->path);
+ else if (r == 0)
+ log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
+ }
+
+ r = fd_set_perms(i, fd, path, &st, creation);
+ if (q < 0) /* prefer the quota change error from above */
+ return q;
+
+ return r;
+}
+
+static int empty_directory(Item *i, const char *path, CreationMode creation) {
+ _cleanup_close_ int fd = -1;
+ struct stat st;
+ int r;
+
+ assert(i);
+ assert(i->type == EMPTY_DIRECTORY);
+
+ r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
+ if (r == -ENOLINK) /* Unsafe symlink: already covered by CHASE_WARN */
+ return r;
+ if (r == -ENOENT) {
+ /* Option "e" operates only on existing objects. Do not print errors about non-existent files
+ * or directories */
+ log_debug_errno(r, "Skipping missing directory: %s", path);
+ return 0;
+ }
+ if (r < 0)
+ return log_error_errno(r, "Failed to open directory '%s': %m", path);
+
+ if (fstat(fd, &st) < 0)
+ return log_error_errno(errno, "Failed to fstat(%s): %m", path);
+ if (!S_ISDIR(st.st_mode)) {
+ log_warning("'%s' already exists and is not a directory.", path);
+ return 0;
+ }
+
+ return fd_set_perms(i, fd, path, &st, creation);
+}
+
+static int create_device(Item *i, mode_t file_type) {
+ _cleanup_close_ int dfd = -1, fd = -1;
+ _cleanup_free_ char *bn = NULL;
+ CreationMode creation;
+ struct stat st;
+ int r;
+
+ assert(i);
+ assert(IN_SET(i->type, CREATE_BLOCK_DEVICE, CREATE_CHAR_DEVICE));
+ assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
+
+ r = path_extract_filename(i->path, &bn);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
+ if (r == O_DIRECTORY)
+ return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for creating device node, is a directory.", i->path);
+
+ /* Validate the path and use the returned directory fd for copying the target so we're sure that the
+ * path can't be changed behind our back. */
+ dfd = path_open_parent_safe(i->path, i->allow_failure);
+ if (dfd < 0)
+ return dfd;
+
+ RUN_WITH_UMASK(0000) {
+ mac_selinux_create_file_prepare(i->path, file_type);
+ r = RET_NERRNO(mknodat(dfd, bn, i->mode | file_type, i->major_minor));
+ mac_selinux_create_file_clear();
+ }
+ creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
+
+ /* Try to open the inode via O_PATH, regardless if we could create it or not. Maybe everything is in
+ * order anyway and we hence can ignore the error to create the device node */
+ fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
+ if (fd < 0) {
+ /* OK, so opening the inode failed, let's look at the original error then. */
+
+ if (r < 0) {
+ if (ERRNO_IS_PRIVILEGE(r))
+ goto handle_privilege;
+
+ return log_error_errno(r, "Failed to create device node '%s': %m", i->path);
+ }
+
+ return log_error_errno(errno, "Failed to open device node '%s' we just created: %m", i->path);
+ }
+
+ if (fstat(fd, &st) < 0)
+ return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
+
+ if (((st.st_mode ^ file_type) & S_IFMT) != 0) {
+
+ if (i->append_or_force) {
+ fd = safe_close(fd);
+
+ RUN_WITH_UMASK(0000) {
+ mac_selinux_create_file_prepare(i->path, file_type);
+ r = mknodat_atomic(dfd, bn, i->mode | file_type, i->major_minor);
+ mac_selinux_create_file_clear();
+ }
+ if (ERRNO_IS_PRIVILEGE(r))
+ goto handle_privilege;
+ if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
+ r = rm_rf_child(dfd, bn, REMOVE_PHYSICAL);
+ if (r < 0)
+ return log_error_errno(r, "rm -rf %s failed: %m", i->path);
+
+ mac_selinux_create_file_prepare(i->path, file_type);
+ r = RET_NERRNO(mknodat(dfd, bn, i->mode | file_type, i->major_minor));
+ mac_selinux_create_file_clear();
+ }
+ if (r < 0)
+ return log_error_errno(r, "Failed to create device node '%s': %m", i->path);
+
+ fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
+ if (fd < 0)
+ return log_error_errno(errno, "Failed to open device node we just created '%s': %m", i->path);
+
+ /* Validate type before change ownership below */
+ if (fstat(fd, &st) < 0)
+ return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
+
+ if (((st.st_mode ^ file_type) & S_IFMT) != 0)
+ return log_error_errno(SYNTHETIC_ERRNO(EBADF), "Device node we just created is not a device node, refusing.");
+
+ creation = CREATION_FORCE;
+ } else {
+ log_warning("\"%s\" already exists and is not a device node.", i->path);
+ return 0;
+ }
+ }
+
+ log_debug("%s %s device node \"%s\" %u:%u.",
+ creation_mode_verb_to_string(creation),
+ i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
+ i->path, major(i->mode), minor(i->mode));
+
+ return fd_set_perms(i, fd, i->path, &st, creation);
+
+handle_privilege:
+ log_debug_errno(r,
+ "We lack permissions, possibly because of cgroup configuration; "
+ "skipping creation of device node '%s'.", i->path);
+ return 0;
+}
+
+static int create_fifo(Item *i) {
+ _cleanup_close_ int pfd = -1, fd = -1;
+ _cleanup_free_ char *bn = NULL;
+ CreationMode creation;
+ struct stat st;
+ int r;
+
+ assert(i);
+ assert(i->type == CREATE_FIFO);
+
+ r = path_extract_filename(i->path, &bn);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
+ if (r == O_DIRECTORY)
+ return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for creating FIFO, is a directory.", i->path);
+
+ pfd = path_open_parent_safe(i->path, i->allow_failure);
+ if (pfd < 0)
+ return pfd;
+
+ RUN_WITH_UMASK(0000) {
+ mac_selinux_create_file_prepare(i->path, S_IFIFO);
+ r = RET_NERRNO(mkfifoat(pfd, bn, i->mode));
+ mac_selinux_create_file_clear();
+ }
+
+ creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
+
+ /* Open the inode via O_PATH, regardless if we managed to create it or not. Maybe it is is already the FIFO we want */
+ fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
+ if (fd < 0) {
+ if (r < 0)
+ return log_error_errno(r, "Failed to create FIFO %s: %m", i->path); /* original error! */
+
+ return log_error_errno(errno, "Failed to open FIFO we just created %s: %m", i->path);
+ }
+
+ if (fstat(fd, &st) < 0)
+ return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
+
+ if (!S_ISFIFO(st.st_mode)) {
+
+ if (i->append_or_force) {
+ fd = safe_close(fd);
+
+ RUN_WITH_UMASK(0000) {
+ mac_selinux_create_file_prepare(i->path, S_IFIFO);
+ r = mkfifoat_atomic(pfd, bn, i->mode);
+ mac_selinux_create_file_clear();
+ }
+ if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
+ r = rm_rf_child(pfd, bn, REMOVE_PHYSICAL);
+ if (r < 0)
+ return log_error_errno(r, "rm -rf %s failed: %m", i->path);
+
+ mac_selinux_create_file_prepare(i->path, S_IFIFO);
+ r = RET_NERRNO(mkfifoat(pfd, bn, i->mode));
+ mac_selinux_create_file_clear();
+ }
+ if (r < 0)
+ return log_error_errno(r, "Failed to create FIFO %s: %m", i->path);
+
+ fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
+ if (fd < 0)
+ return log_error_errno(errno, "Failed to open FIFO we just created '%s': %m", i->path);
+
+ /* Validate type before change ownership below */
+ if (fstat(fd, &st) < 0)
+ return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
+
+ if (!S_ISFIFO(st.st_mode))
+ return log_error_errno(SYNTHETIC_ERRNO(EBADF), "FIFO inode we just created is not a FIFO, refusing.");
+
+ creation = CREATION_FORCE;
+ } else {
+ log_warning("\"%s\" already exists and is not a FIFO.", i->path);
+ return 0;
+ }
+ }
+
+ log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), i->path);
+
+ return fd_set_perms(i, fd, i->path, &st, creation);
+}
+
+static int create_symlink(Item *i) {
+ _cleanup_close_ int pfd = -1, fd = -1;
+ _cleanup_free_ char *bn = NULL;
+ CreationMode creation;
+ struct stat st;
+ bool good = false;
+ int r;
+
+ assert(i);
+
+ r = path_extract_filename(i->path, &bn);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
+ if (r == O_DIRECTORY)
+ return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for creating FIFO, is a directory.", i->path);
+
+ pfd = path_open_parent_safe(i->path, i->allow_failure);
+ if (pfd < 0)
+ return pfd;
+
+ mac_selinux_create_file_prepare(i->path, S_IFLNK);
+ r = RET_NERRNO(symlinkat(i->argument, pfd, bn));
+ mac_selinux_create_file_clear();
+
+ creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
+
+ fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
+ if (fd < 0) {
+ if (r < 0)
+ return log_error_errno(r, "Failed to create symlink '%s': %m", i->path); /* original error! */
+
+ return log_error_errno(errno, "Failed to open symlink we just created '%s': %m", i->path);
+ }
+
+ if (fstat(fd, &st) < 0)
+ return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
+
+ if (S_ISLNK(st.st_mode)) {
+ _cleanup_free_ char *x = NULL;
+
+ r = readlinkat_malloc(fd, "", &x);
+ if (r < 0)
+ return log_error_errno(r, "readlinkat(%s) failed: %m", i->path);
+
+ good = streq(x, i->argument);
+ } else
+ good = false;
+
+ if (!good) {
+ if (!i->append_or_force) {
+ log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
+ return 0;
+ }
+
+ fd = safe_close(fd);
+
+ mac_selinux_create_file_prepare(i->path, S_IFLNK);
+ r = symlinkat_atomic_full(i->argument, pfd, bn, /* make_relative= */ false);
+ mac_selinux_create_file_clear();
+ if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
+ r = rm_rf_child(pfd, bn, REMOVE_PHYSICAL);
+ if (r < 0)
+ return log_error_errno(r, "rm -rf %s failed: %m", i->path);
+
+ mac_selinux_create_file_prepare(i->path, S_IFLNK);
+ r = RET_NERRNO(symlinkat(i->argument, pfd, i->path));
+ mac_selinux_create_file_clear();
+ }
+ if (r < 0)
+ return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
+
+ fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
+ if (fd < 0)
+ return log_error_errno(errno, "Failed to open symlink we just created '%s': %m", i->path);
+
+ /* Validate type before change ownership below */
+ if (fstat(fd, &st) < 0)
+ return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
+
+ if (!S_ISLNK(st.st_mode))
+ return log_error_errno(SYNTHETIC_ERRNO(EBADF), "Symlink we just created is not a symlink, refusing.");
+
+ creation = CREATION_FORCE;
+ }
+
+ log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
+ return fd_set_perms(i, fd, i->path, &st, creation);
+}
+
+typedef int (*action_t)(Item *i, const char *path, CreationMode creation);
+typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st, CreationMode creation);
+
+static int item_do(
+ Item *i,
+ int fd,
+ const char *path,
+ CreationMode creation,
+ fdaction_t action) {
+
+ struct stat st;
+ int r = 0, q;
+
+ assert(i);
+ assert(path);
+ assert(fd >= 0);
+
+ if (fstat(fd, &st) < 0) {
+ r = log_error_errno(errno, "fstat() on file failed: %m");
+ goto finish;
+ }
+
+ /* This returns the first error we run into, but nevertheless tries to go on */
+ r = action(i, fd, path, &st, creation);
+
+ if (S_ISDIR(st.st_mode)) {
+ _cleanup_closedir_ DIR *d = NULL;
+
+ /* The passed 'fd' was opened with O_PATH. We need to convert it into a 'regular' fd before
+ * reading the directory content. */
+ d = opendir(FORMAT_PROC_FD_PATH(fd));
+ if (!d) {
+ log_error_errno(errno, "Failed to opendir() '%s': %m", FORMAT_PROC_FD_PATH(fd));
+ if (r == 0)
+ r = -errno;
+ goto finish;
+ }
+
+ FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
+ int de_fd;
+
+ if (dot_or_dot_dot(de->d_name))
+ continue;
+
+ de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
+ if (de_fd < 0)
+ q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
+ else {
+ _cleanup_free_ char *de_path = NULL;
+
+ de_path = path_join(path, de->d_name);
+ if (!de_path)
+ q = log_oom();
+ else
+ /* Pass ownership of dirent fd over */
+ q = item_do(i, de_fd, de_path, CREATION_EXISTING, action);
+ }
+
+ if (q < 0 && r == 0)
+ r = q;
+ }
+ }
+finish:
+ safe_close(fd);
+ return r;
+}
+
+static int glob_item(Item *i, action_t action) {
+ _cleanup_globfree_ glob_t g = {
+ .gl_opendir = (void *(*)(const char *)) opendir_nomod,
+ };
+ int r = 0, k;
+
+ k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
+ if (k < 0 && k != -ENOENT)
+ return log_error_errno(k, "glob(%s) failed: %m", i->path);
+
+ STRV_FOREACH(fn, g.gl_pathv) {
+ /* We pass CREATION_EXISTING here, since if we are globbing for it, it always has to exist */
+ k = action(i, *fn, CREATION_EXISTING);
+ if (k < 0 && r == 0)
+ r = k;
+ }
+
+ return r;
+}
+
+static int glob_item_recursively(Item *i, fdaction_t action) {
+ _cleanup_globfree_ glob_t g = {
+ .gl_opendir = (void *(*)(const char *)) opendir_nomod,
+ };
+ int r = 0, k;
+
+ k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
+ if (k < 0 && k != -ENOENT)
+ return log_error_errno(k, "glob(%s) failed: %m", i->path);
+
+ STRV_FOREACH(fn, g.gl_pathv) {
+ _cleanup_close_ int fd = -1;
+
+ /* Make sure we won't trigger/follow file object (such as
+ * device nodes, automounts, ...) pointed out by 'fn' with
+ * O_PATH. Note, when O_PATH is used, flags other than
+ * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
+
+ fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
+ if (fd < 0) {
+ log_error_errno(errno, "Opening '%s' failed: %m", *fn);
+ if (r == 0)
+ r = -errno;
+ continue;
+ }
+
+ k = item_do(i, fd, *fn, CREATION_EXISTING, action);
+ if (k < 0 && r == 0)
+ r = k;
+
+ /* we passed fd ownership to the previous call */
+ fd = -1;
+ }
+
+ return r;
+}
+
+static int rm_if_wrong_type_safe(
+ mode_t mode,
+ int parent_fd,
+ const struct stat *parent_st, /* Only used if follow_links below is true. */
+ const char *name,
+ int flags) {
+ _cleanup_free_ char *parent_name = NULL;
+ bool follow_links = !FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW);
+ struct stat st;
+ int r;
+
+ assert(name);
+ assert((mode & ~S_IFMT) == 0);
+ assert(!follow_links || parent_st);
+ assert((flags & ~AT_SYMLINK_NOFOLLOW) == 0);
+
+ if (!filename_is_valid(name))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "\"%s\" is not a valid filename.", name);
+
+ r = fstatat_harder(parent_fd, name, &st, flags, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
+ if (r < 0) {
+ (void) fd_get_path(parent_fd, &parent_name);
+ return log_full_errno(r == -ENOENT? LOG_DEBUG : LOG_ERR, r,
+ "Failed to stat \"%s\" at \"%s\": %m", name, strna(parent_name));
+ }
+
+ /* Fail before removing anything if this is an unsafe transition. */
+ if (follow_links && unsafe_transition(parent_st, &st)) {
+ (void) fd_get_path(parent_fd, &parent_name);
+ return log_error_errno(SYNTHETIC_ERRNO(ENOLINK),
+ "Unsafe transition from \"%s\" to \"%s\".", parent_name, name);
+ }
+
+ if ((st.st_mode & S_IFMT) == mode)
+ return 0;
+
+ (void) fd_get_path(parent_fd, &parent_name);
+ log_notice("Wrong file type 0o%o; rm -rf \"%s/%s\"", st.st_mode & S_IFMT, strna(parent_name), name);
+
+ /* If the target of the symlink was the wrong type, the link needs to be removed instead of the
+ * target, so make sure it is identified as a link and not a directory. */
+ if (follow_links) {
+ r = fstatat_harder(parent_fd, name, &st, AT_SYMLINK_NOFOLLOW, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
+ if (r < 0)
+ return log_error_errno(r, "Failed to stat \"%s\" at \"%s\": %m", name, strna(parent_name));
+ }
+
+ /* Do not remove mount points. */
+ r = fd_is_mount_point(parent_fd, name, follow_links ? AT_SYMLINK_FOLLOW : 0);
+ if (r < 0)
+ (void) log_warning_errno(r, "Failed to check if \"%s/%s\" is a mount point: %m; Continuing",
+ strna(parent_name), name);
+ else if (r > 0)
+ return log_error_errno(SYNTHETIC_ERRNO(EBUSY),
+ "Not removing \"%s/%s\" because it is a mount point.", strna(parent_name), name);
+
+ if ((st.st_mode & S_IFMT) == S_IFDIR) {
+ _cleanup_close_ int child_fd = -1;
+
+ child_fd = openat(parent_fd, name, O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
+ if (child_fd < 0)
+ return log_error_errno(errno, "Failed to open \"%s\" at \"%s\": %m", name, strna(parent_name));
+
+ r = rm_rf_children(TAKE_FD(child_fd), REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL, &st);
+ if (r < 0)
+ return log_error_errno(r, "Failed to remove contents of \"%s\" at \"%s\": %m", name, strna(parent_name));
+
+ r = unlinkat_harder(parent_fd, name, AT_REMOVEDIR, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
+ } else
+ r = unlinkat_harder(parent_fd, name, 0, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
+ if (r < 0)
+ return log_error_errno(r, "Failed to remove \"%s\" at \"%s\": %m", name, strna(parent_name));
+
+ /* This is covered by the log_notice "Wrong file type..." It is logged earlier because it gives
+ * context to other error messages that might follow. */
+ return -ENOENT;
+}
+
+/* If child_mode is non-zero, rm_if_wrong_type_safe will be executed for the last path component. */
+static int mkdir_parents_rm_if_wrong_type(mode_t child_mode, const char *path) {
+ _cleanup_close_ int parent_fd = -1;
+ struct stat parent_st;
+ size_t path_len;
+ int r;
+
+ assert(path);
+ assert((child_mode & ~S_IFMT) == 0);
+
+ path_len = strlen(path);
+
+ if (!is_path(path))
+ /* rm_if_wrong_type_safe already logs errors. */
+ return child_mode != 0 ? rm_if_wrong_type_safe(child_mode, AT_FDCWD, NULL, path, AT_SYMLINK_NOFOLLOW) : 0;
+
+ if (child_mode != 0 && endswith(path, "/"))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Trailing path separators are only allowed if child_mode is not set; got \"%s\"", path);
+
+ /* Get the parent_fd and stat. */
+ parent_fd = openat(AT_FDCWD, path_is_absolute(path) ? "/" : ".", O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
+ if (parent_fd < 0)
+ return log_error_errno(errno, "Failed to open root: %m");
+
+ if (fstat(parent_fd, &parent_st) < 0)
+ return log_error_errno(errno, "Failed to stat root: %m");
+
+ /* Check every parent directory in the path, except the last component */
+ for (const char *e = path;;) {
+ _cleanup_close_ int next_fd = -1;
+ char t[path_len + 1];
+ const char *s;
+
+ /* Find the start of the next path component. */
+ s = e + strspn(e, "/");
+ /* Find the end of the next path component. */
+ e = s + strcspn(s, "/");
+
+ /* Copy the path component to t so it can be a null terminated string. */
+ *((char*) mempcpy(t, s, e - s)) = 0;
+
+ /* Is this the last component? If so, then check the type */
+ if (*e == 0)
+ return child_mode != 0 ? rm_if_wrong_type_safe(child_mode, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW) : 0;
+
+ r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, 0);
+ /* Remove dangling symlinks. */
+ if (r == -ENOENT)
+ r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW);
+ if (r == -ENOENT) {
+ RUN_WITH_UMASK(0000)
+ r = mkdirat_label(parent_fd, t, 0755);
+ if (r < 0) {
+ _cleanup_free_ char *parent_name = NULL;
+
+ (void) fd_get_path(parent_fd, &parent_name);
+ return log_error_errno(r, "Failed to mkdir \"%s\" at \"%s\": %m", t, strnull(parent_name));
+ }
+ } else if (r < 0)
+ /* rm_if_wrong_type_safe already logs errors. */
+ return r;
+
+ next_fd = RET_NERRNO(openat(parent_fd, t, O_NOCTTY | O_CLOEXEC | O_DIRECTORY));
+ if (next_fd < 0) {
+ _cleanup_free_ char *parent_name = NULL;
+
+ (void) fd_get_path(parent_fd, &parent_name);
+ return log_error_errno(next_fd, "Failed to open \"%s\" at \"%s\": %m", t, strnull(parent_name));
+ }
+ r = RET_NERRNO(fstat(next_fd, &parent_st));
+ if (r < 0) {
+ _cleanup_free_ char *parent_name = NULL;
+
+ (void) fd_get_path(parent_fd, &parent_name);
+ return log_error_errno(r, "Failed to stat \"%s\" at \"%s\": %m", t, strnull(parent_name));
+ }
+
+ close_and_replace(parent_fd, next_fd);
+ }
+}
+
+static int mkdir_parents_item(Item *i, mode_t child_mode) {
+ int r;
+ if (i->try_replace) {
+ r = mkdir_parents_rm_if_wrong_type(child_mode, i->path);
+ if (r < 0 && r != -ENOENT)
+ return r;
+ } else
+ RUN_WITH_UMASK(0000)
+ (void) mkdir_parents_label(i->path, 0755);
+
+ return 0;
+}
+
+static int create_item(Item *i) {
+ int r;
+
+ assert(i);
+
+ log_debug("Running create action for entry %c %s", (char) i->type, i->path);
+
+ switch (i->type) {
+
+ case IGNORE_PATH:
+ case IGNORE_DIRECTORY_PATH:
+ case REMOVE_PATH:
+ case RECURSIVE_REMOVE_PATH:
+ return 0;
+
+ case TRUNCATE_FILE:
+ case CREATE_FILE:
+ r = mkdir_parents_item(i, S_IFREG);
+ if (r < 0)
+ return r;
+
+ if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
+ r = truncate_file(i, i->path);
+ else
+ r = create_file(i, i->path);
+ if (r < 0)
+ return r;
+ break;
+
+ case COPY_FILES:
+ r = mkdir_parents_item(i, 0);
+ if (r < 0)
+ return r;
+
+ r = copy_files(i);
+ if (r < 0)
+ return r;
+ break;
+
+ case WRITE_FILE:
+ r = glob_item(i, write_one_file);
+ if (r < 0)
+ return r;
+
+ break;
+
+ case CREATE_DIRECTORY:
+ case TRUNCATE_DIRECTORY:
+ r = mkdir_parents_item(i, S_IFDIR);
+ if (r < 0)
+ return r;
+
+ r = create_directory(i, i->path);
+ if (r < 0)
+ return r;
+ break;
+
+ case CREATE_SUBVOLUME:
+ case CREATE_SUBVOLUME_INHERIT_QUOTA:
+ case CREATE_SUBVOLUME_NEW_QUOTA:
+ r = mkdir_parents_item(i, S_IFDIR);
+ if (r < 0)
+ return r;
+
+ r = create_subvolume(i, i->path);
+ if (r < 0)
+ return r;
+ break;
+
+ case EMPTY_DIRECTORY:
+ r = glob_item(i, empty_directory);
+ if (r < 0)
+ return r;
+ break;
+
+ case CREATE_FIFO:
+ r = mkdir_parents_item(i, S_IFIFO);
+ if (r < 0)
+ return r;
+
+ r = create_fifo(i);
+ if (r < 0)
+ return r;
+ break;
+
+ case CREATE_SYMLINK:
+ r = mkdir_parents_item(i, S_IFLNK);
+ if (r < 0)
+ return r;
+
+ r = create_symlink(i);
+ if (r < 0)
+ return r;
+
+ break;
+
+ case CREATE_BLOCK_DEVICE:
+ case CREATE_CHAR_DEVICE:
+ if (have_effective_cap(CAP_MKNOD) == 0) {
+ /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
+ * case to avoid noise, and we don't support virtualized devices in containers anyway. */
+
+ log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
+ return 0;
+ }
+
+ r = mkdir_parents_item(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
+ if (r < 0)
+ return r;
+
+ r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
+ if (r < 0)
+ return r;
+
+ break;
+
+ case ADJUST_MODE:
+ case RELABEL_PATH:
+ r = glob_item(i, path_set_perms);
+ if (r < 0)
+ return r;
+ break;
+
+ case RECURSIVE_RELABEL_PATH:
+ r = glob_item_recursively(i, fd_set_perms);
+ if (r < 0)
+ return r;
+ break;
+
+ case SET_XATTR:
+ r = glob_item(i, path_set_xattrs);
+ if (r < 0)
+ return r;
+ break;
+
+ case RECURSIVE_SET_XATTR:
+ r = glob_item_recursively(i, fd_set_xattrs);
+ if (r < 0)
+ return r;
+ break;
+
+ case SET_ACL:
+ r = glob_item(i, path_set_acls);
+ if (r < 0)
+ return r;
+ break;
+
+ case RECURSIVE_SET_ACL:
+ r = glob_item_recursively(i, fd_set_acls);
+ if (r < 0)
+ return r;
+ break;
+
+ case SET_ATTRIBUTE:
+ r = glob_item(i, path_set_attribute);
+ if (r < 0)
+ return r;
+ break;
+
+ case RECURSIVE_SET_ATTRIBUTE:
+ r = glob_item_recursively(i, fd_set_attribute);
+ if (r < 0)
+ return r;
+ break;
+ }
+
+ return 0;
+}
+
+static int remove_item_instance(Item *i, const char *instance, CreationMode creation) {
+ int r;
+
+ assert(i);
+
+ switch (i->type) {
+
+ case REMOVE_PATH:
+ if (remove(instance) < 0 && errno != ENOENT)
+ return log_error_errno(errno, "rm(%s): %m", instance);
+
+ break;
+
+ case RECURSIVE_REMOVE_PATH:
+ /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
+ log_debug("rm -rf \"%s\"", instance);
+ r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
+ if (r < 0 && r != -ENOENT)
+ return log_error_errno(r, "rm_rf(%s): %m", instance);
+
+ break;
+
+ default:
+ assert_not_reached();
+ }
+
+ return 0;
+}
+
+static int remove_item(Item *i) {
+ int r;
+
+ assert(i);
+
+ log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
+
+ switch (i->type) {
+
+ case TRUNCATE_DIRECTORY:
+ /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
+ log_debug("rm -rf \"%s\"", i->path);
+ r = rm_rf(i->path, REMOVE_PHYSICAL);
+ if (r < 0 && r != -ENOENT)
+ return log_error_errno(r, "rm_rf(%s): %m", i->path);
+
+ return 0;
+
+ case REMOVE_PATH:
+ case RECURSIVE_REMOVE_PATH:
+ return glob_item(i, remove_item_instance);
+
+ default:
+ return 0;
+ }
+}
+
+static char *age_by_to_string(AgeBy ab, bool is_dir) {
+ static const char ab_map[] = { 'a', 'b', 'c', 'm' };
+ size_t j = 0;
+ char *ret;
+
+ ret = new(char, ELEMENTSOF(ab_map) + 1);
+ if (!ret)
+ return NULL;
+
+ for (size_t i = 0; i < ELEMENTSOF(ab_map); i++)
+ if (FLAGS_SET(ab, 1U << i))
+ ret[j++] = is_dir ? ascii_toupper(ab_map[i]) : ab_map[i];
+
+ ret[j] = 0;
+ return ret;
+}
+
+static int clean_item_instance(
+ Item *i,
+ const char* instance,
+ CreationMode creation) {
+
+ _cleanup_closedir_ DIR *d = NULL;
+ STRUCT_STATX_DEFINE(sx);
+ int mountpoint, r;
+ usec_t cutoff, n;
+
+ assert(i);
+
+ if (!i->age_set)
+ return 0;
+
+ n = now(CLOCK_REALTIME);
+ if (n < i->age)
+ return 0;
+
+ cutoff = n - i->age;
+
+ d = opendir_nomod(instance);
+ if (!d) {
+ if (IN_SET(errno, ENOENT, ENOTDIR)) {
+ log_debug_errno(errno, "Directory \"%s\": %m", instance);
+ return 0;
+ }
+
+ return log_error_errno(errno, "Failed to open directory %s: %m", instance);
+ }
+
+ r = statx_fallback(dirfd(d), "", AT_EMPTY_PATH, STATX_MODE|STATX_INO|STATX_ATIME|STATX_MTIME, &sx);
+ if (r < 0)
+ return log_error_errno(r, "statx(%s) failed: %m", instance);
+
+ if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT))
+ mountpoint = FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT);
+ else {
+ struct stat ps;
+
+ if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
+ return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
+
+ mountpoint =
+ sx.stx_dev_major != major(ps.st_dev) ||
+ sx.stx_dev_minor != minor(ps.st_dev) ||
+ sx.stx_ino != ps.st_ino;
+ }
+
+ if (DEBUG_LOGGING) {
+ _cleanup_free_ char *ab_f = NULL, *ab_d = NULL;
+
+ ab_f = age_by_to_string(i->age_by_file, false);
+ if (!ab_f)
+ return log_oom();
+
+ ab_d = age_by_to_string(i->age_by_dir, true);
+ if (!ab_d)
+ return log_oom();
+
+ log_debug("Cleanup threshold for %s \"%s\" is %s; age-by: %s%s",
+ mountpoint ? "mount point" : "directory",
+ instance,
+ FORMAT_TIMESTAMP_STYLE(cutoff, TIMESTAMP_US),
+ ab_f, ab_d);
+ }
+
+ return dir_cleanup(i, instance, d,
+ load_statx_timestamp_nsec(&sx.stx_atime),
+ load_statx_timestamp_nsec(&sx.stx_mtime),
+ cutoff * NSEC_PER_USEC,
+ sx.stx_dev_major, sx.stx_dev_minor, mountpoint,
+ MAX_DEPTH, i->keep_first_level,
+ i->age_by_file, i->age_by_dir);
+}
+
+static int clean_item(Item *i) {
+ assert(i);
+
+ log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
+
+ switch (i->type) {
+ case CREATE_DIRECTORY:
+ case CREATE_SUBVOLUME:
+ case CREATE_SUBVOLUME_INHERIT_QUOTA:
+ case CREATE_SUBVOLUME_NEW_QUOTA:
+ case TRUNCATE_DIRECTORY:
+ case IGNORE_PATH:
+ case COPY_FILES:
+ clean_item_instance(i, i->path, CREATION_EXISTING);
+ return 0;
+ case EMPTY_DIRECTORY:
+ case IGNORE_DIRECTORY_PATH:
+ return glob_item(i, clean_item_instance);
+ default:
+ return 0;
+ }
+}
+
+static int process_item(Item *i, OperationMask operation) {
+ OperationMask todo;
+ _cleanup_free_ char *_path = NULL;
+ const char *path;
+ int r, q, p;
+
+ assert(i);
+
+ todo = operation & ~i->done;
+ if (todo == 0) /* Everything already done? */
+ return 0;
+
+ i->done |= operation;
+
+ path = i->path;
+ if (string_is_glob(path)) {
+ /* We can't easily check whether a glob matches any autofs path, so let's do the check only
+ * for the non-glob part. */
+
+ r = glob_non_glob_prefix(path, &_path);
+ if (r < 0 && r != -ENOENT)
+ return log_debug_errno(r, "Failed to deglob path: %m");
+ if (r >= 0)
+ path = _path;
+ }
+
+ r = chase_symlinks(path, arg_root, CHASE_NO_AUTOFS|CHASE_NONEXISTENT|CHASE_WARN, NULL, NULL);
+ if (r == -EREMOTE) {
+ log_notice_errno(r, "Skipping %s", i->path); /* We log the configured path, to not confuse the user. */
+ return 0;
+ }
+ if (r < 0)
+ log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
+
+ r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
+ /* Failure can only be tolerated for create */
+ if (i->allow_failure)
+ r = 0;
+
+ q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
+ p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
+
+ return r < 0 ? r :
+ q < 0 ? q :
+ p;
+}
+
+static int process_item_array(ItemArray *array, OperationMask operation) {
+ int r = 0;
+ size_t n;
+
+ assert(array);
+
+ /* Create any parent first. */
+ if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
+ r = process_item_array(array->parent, operation & OPERATION_CREATE);
+
+ /* Clean up all children first */
+ if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
+ ItemArray *c;
+
+ SET_FOREACH(c, array->children) {
+ int k;
+
+ k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
+ if (k < 0 && r == 0)
+ r = k;
+ }
+ }
+
+ for (n = 0; n < array->n_items; n++) {
+ int k;
+
+ k = process_item(array->items + n, operation);
+ if (k < 0 && r == 0)
+ r = k;
+ }
+
+ return r;
+}
+
+static void item_free_contents(Item *i) {
+ assert(i);
+ free(i->path);
+ free(i->argument);
+ free(i->binary_argument);
+ strv_free(i->xattrs);
+
+#if HAVE_ACL
+ if (i->acl_access)
+ acl_free(i->acl_access);
+
+ if (i->acl_default)
+ acl_free(i->acl_default);
+#endif
+}
+
+static ItemArray* item_array_free(ItemArray *a) {
+ size_t n;
+
+ if (!a)
+ return NULL;
+
+ for (n = 0; n < a->n_items; n++)
+ item_free_contents(a->items + n);
+
+ set_free(a->children);
+ free(a->items);
+ return mfree(a);
+}
+
+static int item_compare(const Item *a, const Item *b) {
+ /* Make sure that the ownership taking item is put first, so
+ * that we first create the node, and then can adjust it */
+
+ if (takes_ownership(a->type) && !takes_ownership(b->type))
+ return -1;
+ if (!takes_ownership(a->type) && takes_ownership(b->type))
+ return 1;
+
+ return CMP(a->type, b->type);
+}
+
+static bool item_compatible(const Item *a, const Item *b) {
+ assert(a);
+ assert(b);
+ assert(streq(a->path, b->path));
+
+ if (takes_ownership(a->type) && takes_ownership(b->type))
+ /* check if the items are the same */
+ return memcmp_nn(item_binary_argument(a), item_binary_argument_size(a),
+ item_binary_argument(b), item_binary_argument_size(b)) == 0 &&
+
+ a->uid_set == b->uid_set &&
+ a->uid == b->uid &&
+ a->uid_only_create == b->uid_only_create &&
+
+ a->gid_set == b->gid_set &&
+ a->gid == b->gid &&
+ a->gid_only_create == b->gid_only_create &&
+
+ a->mode_set == b->mode_set &&
+ a->mode == b->mode &&
+ a->mode_only_create == b->mode_only_create &&
+
+ a->age_set == b->age_set &&
+ a->age == b->age &&
+
+ a->age_by_file == b->age_by_file &&
+ a->age_by_dir == b->age_by_dir &&
+
+ a->mask_perms == b->mask_perms &&
+
+ a->keep_first_level == b->keep_first_level &&
+
+ a->major_minor == b->major_minor;
+
+ return true;
+}
+
+static bool should_include_path(const char *path) {
+ STRV_FOREACH(prefix, arg_exclude_prefixes)
+ if (path_startswith(path, *prefix)) {
+ log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
+ path, *prefix);
+ return false;
+ }
+
+ STRV_FOREACH(prefix, arg_include_prefixes)
+ if (path_startswith(path, *prefix)) {
+ log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
+ return true;
+ }
+
+ /* no matches, so we should include this path only if we have no allow list at all */
+ if (strv_isempty(arg_include_prefixes))
+ return true;
+
+ log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
+ return false;
+}
+
+static int specifier_expansion_from_arg(const Specifier *specifier_table, Item *i) {
+ int r;
+
+ assert(i);
+
+ if (!i->argument)
+ return 0;
+
+ switch (i->type) {
+ case COPY_FILES:
+ case CREATE_SYMLINK:
+ case CREATE_FILE:
+ case TRUNCATE_FILE:
+ case WRITE_FILE: {
+ _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
+ ssize_t l;
+
+ l = cunescape(i->argument, 0, &unescaped);
+ if (l < 0)
+ return log_error_errno(l, "Failed to unescape parameter to write: %s", i->argument);
+
+ r = specifier_printf(unescaped, PATH_MAX-1, specifier_table, arg_root, NULL, &resolved);
+ if (r < 0)
+ return r;
+
+ return free_and_replace(i->argument, resolved);
+ }
+ case SET_XATTR:
+ case RECURSIVE_SET_XATTR:
+ STRV_FOREACH(xattr, i->xattrs) {
+ _cleanup_free_ char *resolved = NULL;
+
+ r = specifier_printf(*xattr, SIZE_MAX, specifier_table, arg_root, NULL, &resolved);
+ if (r < 0)
+ return r;
+
+ free_and_replace(*xattr, resolved);
+ }
+ return 0;
+
+ default:
+ return 0;
+ }
+}
+
+static int patch_var_run(const char *fname, unsigned line, char **path) {
+ const char *k;
+ char *n;
+
+ assert(path);
+ assert(*path);
+
+ /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
+ * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
+ * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
+ * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
+ * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
+ * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
+ * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
+ * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
+ * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
+
+ k = path_startswith(*path, "/var/run/");
+ if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
+ return 0;
+
+ n = path_join("/run", k);
+ if (!n)
+ return log_oom();
+
+ /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
+ * there's no immediate need for action by the user. However, in the interest of making things less confusing
+ * to the user, let's still inform the user that these snippets should really be updated. */
+ log_syntax(NULL, LOG_NOTICE, fname, line, 0,
+ "Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.",
+ *path, n);
+
+ free_and_replace(*path, n);
+
+ return 0;
+}
+
+static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
+ int r;
+
+ assert(user);
+ assert(ret_uid);
+
+ /* First: parse as numeric UID string */
+ r = parse_uid(user, ret_uid);
+ if (r >= 0)
+ return r;
+
+ /* Second: pass to NSS if we are running "online" */
+ if (!arg_root)
+ return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
+
+ /* Third, synthesize "root" unconditionally */
+ if (streq(user, "root")) {
+ *ret_uid = 0;
+ return 0;
+ }
+
+ /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
+ return name_to_uid_offline(arg_root, user, ret_uid, cache);
+}
+
+static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
+ int r;
+
+ assert(group);
+ assert(ret_gid);
+
+ /* First: parse as numeric GID string */
+ r = parse_gid(group, ret_gid);
+ if (r >= 0)
+ return r;
+
+ /* Second: pass to NSS if we are running "online" */
+ if (!arg_root)
+ return get_group_creds(&group, ret_gid, 0);
+
+ /* Third, synthesize "root" unconditionally */
+ if (streq(group, "root")) {
+ *ret_gid = 0;
+ return 0;
+ }
+
+ /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
+ return name_to_gid_offline(arg_root, group, ret_gid, cache);
+}
+
+static int parse_age_by_from_arg(const char *age_by_str, Item *item) {
+ AgeBy ab_f = 0, ab_d = 0;
+
+ static const struct {
+ char age_by_chr;
+ AgeBy age_by_flag;
+ } age_by_types[] = {
+ { 'a', AGE_BY_ATIME },
+ { 'b', AGE_BY_BTIME },
+ { 'c', AGE_BY_CTIME },
+ { 'm', AGE_BY_MTIME },
+ };
+
+ assert(age_by_str);
+ assert(item);
+
+ if (isempty(age_by_str))
+ return -EINVAL;
+
+ for (const char *s = age_by_str; *s != 0; s++) {
+ size_t i;
+
+ /* Ignore whitespace. */
+ if (strchr(WHITESPACE, *s))
+ continue;
+
+ for (i = 0; i < ELEMENTSOF(age_by_types); i++) {
+ /* Check lower-case for files, upper-case for directories. */
+ if (*s == age_by_types[i].age_by_chr) {
+ ab_f |= age_by_types[i].age_by_flag;
+ break;
+ } else if (*s == ascii_toupper(age_by_types[i].age_by_chr)) {
+ ab_d |= age_by_types[i].age_by_flag;
+ break;
+ }
+ }
+
+ /* Invalid character. */
+ if (i >= ELEMENTSOF(age_by_types))
+ return -EINVAL;
+ }
+
+ /* No match. */
+ if (ab_f == 0 && ab_d == 0)
+ return -EINVAL;
+
+ item->age_by_file = ab_f > 0 ? ab_f : AGE_BY_DEFAULT_FILE;
+ item->age_by_dir = ab_d > 0 ? ab_d : AGE_BY_DEFAULT_DIR;
+
+ return 0;
+}
+
+static bool is_duplicated_item(ItemArray *existing, const Item *i) {
+
+ assert(existing);
+ assert(i);
+
+ for (size_t n = 0; n < existing->n_items; n++) {
+ const Item *e = existing->items + n;
+
+ if (item_compatible(e, i))
+ continue;
+
+ /* Only multiple 'w+' lines for the same path are allowed. */
+ if (e->type != WRITE_FILE || !e->append_or_force ||
+ i->type != WRITE_FILE || !i->append_or_force)
+ return true;
+ }
+
+ return false;
+}
+
+static int parse_line(
+ const char *fname,
+ unsigned line,
+ const char *buffer,
+ bool *invalid_config,
+ Hashmap **uid_cache,
+ Hashmap **gid_cache) {
+
+ _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
+ _cleanup_(item_free_contents) Item i = {
+ /* The "age-by" argument considers all file timestamp types by default. */
+ .age_by_file = AGE_BY_DEFAULT_FILE,
+ .age_by_dir = AGE_BY_DEFAULT_DIR,
+ };
+ ItemArray *existing;
+ OrderedHashmap *h;
+ int r, pos;
+ bool append_or_force = false, boot = false, allow_failure = false, try_replace = false, unbase64 = false, from_cred = false;
+
+ assert(fname);
+ assert(line >= 1);
+ assert(buffer);
+
+ const Specifier specifier_table[] = {
+ { 'a', specifier_architecture, NULL },
+ { 'b', specifier_boot_id, NULL },
+ { 'B', specifier_os_build_id, NULL },
+ { 'H', specifier_hostname, NULL },
+ { 'l', specifier_short_hostname, NULL },
+ { 'm', specifier_machine_id, NULL },
+ { 'o', specifier_os_id, NULL },
+ { 'v', specifier_kernel_release, NULL },
+ { 'w', specifier_os_version_id, NULL },
+ { 'W', specifier_os_variant_id, NULL },
+
+ { 'h', specifier_user_home, NULL },
+
+ { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
+ { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
+ { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
+ { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
+
+ COMMON_CREDS_SPECIFIERS(arg_user ? LOOKUP_SCOPE_USER : LOOKUP_SCOPE_SYSTEM),
+ COMMON_TMP_SPECIFIERS,
+ {}
+ };
+
+ r = extract_many_words(
+ &buffer,
+ NULL,
+ EXTRACT_UNQUOTE,
+ &action,
+ &path,
+ &mode,
+ &user,
+ &group,
+ &age,
+ NULL);
+ if (r < 0) {
+ if (IN_SET(r, -EINVAL, -EBADSLT))
+ /* invalid quoting and such or an unknown specifier */
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
+ } else if (r < 2) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
+ }
+
+ if (!empty_or_dash(buffer)) {
+ i.argument = strdup(buffer);
+ if (!i.argument)
+ return log_oom();
+ }
+
+ if (isempty(action)) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
+ }
+
+ for (pos = 1; action[pos]; pos++) {
+ if (action[pos] == '!' && !boot)
+ boot = true;
+ else if (action[pos] == '+' && !append_or_force)
+ append_or_force = true;
+ else if (action[pos] == '-' && !allow_failure)
+ allow_failure = true;
+ else if (action[pos] == '=' && !try_replace)
+ try_replace = true;
+ else if (action[pos] == '~' && !unbase64)
+ unbase64 = true;
+ else if (action[pos] == '^' && !from_cred)
+ from_cred = true;
+ else {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
+ }
+ }
+
+ if (boot && !arg_boot) {
+ log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
+ return 0;
+ }
+
+ i.type = action[0];
+ i.append_or_force = append_or_force;
+ i.allow_failure = allow_failure;
+ i.try_replace = try_replace;
+
+ r = specifier_printf(path, PATH_MAX-1, specifier_table, arg_root, NULL, &i.path);
+ if (ERRNO_IS_NOINFO(r))
+ return log_unresolvable_specifier(fname, line);
+ if (r < 0) {
+ if (IN_SET(r, -EINVAL, -EBADSLT))
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
+ }
+
+ r = patch_var_run(fname, line, &i.path);
+ if (r < 0)
+ return r;
+
+ if (!path_is_absolute(i.path)) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
+ "Path '%s' not absolute.", i.path);
+ }
+
+ path_simplify(i.path);
+
+ switch (i.type) {
+
+ case CREATE_DIRECTORY:
+ case CREATE_SUBVOLUME:
+ case CREATE_SUBVOLUME_INHERIT_QUOTA:
+ case CREATE_SUBVOLUME_NEW_QUOTA:
+ case EMPTY_DIRECTORY:
+ case TRUNCATE_DIRECTORY:
+ case CREATE_FIFO:
+ case IGNORE_PATH:
+ case IGNORE_DIRECTORY_PATH:
+ case REMOVE_PATH:
+ case RECURSIVE_REMOVE_PATH:
+ case ADJUST_MODE:
+ case RELABEL_PATH:
+ case RECURSIVE_RELABEL_PATH:
+ if (i.argument)
+ log_syntax(NULL,
+ LOG_WARNING,
+ fname,
+ line,
+ 0,
+ "%c lines don't take argument fields, ignoring.",
+ (char) i.type);
+
+ break;
+
+ case CREATE_FILE:
+ case TRUNCATE_FILE:
+ break;
+
+ case CREATE_SYMLINK:
+ if (unbase64) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for symlink targets.");
+ }
+ break;
+
+ case WRITE_FILE:
+ if (!i.argument) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
+ }
+ break;
+
+ case COPY_FILES:
+ if (unbase64) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for copy sources.");
+ }
+ break;
+
+ case CREATE_CHAR_DEVICE:
+ case CREATE_BLOCK_DEVICE:
+ if (unbase64) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for device node creation.");
+ }
+
+ if (!i.argument) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
+ }
+
+ r = parse_devnum(i.argument, &i.major_minor);
+ if (r < 0) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
+ }
+
+ break;
+
+ case SET_XATTR:
+ case RECURSIVE_SET_XATTR:
+ if (unbase64) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for extended attributes.");
+ }
+ if (!i.argument) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
+ "Set extended attribute requires argument.");
+ }
+ r = parse_xattrs_from_arg(&i);
+ if (r < 0)
+ return r;
+ break;
+
+ case SET_ACL:
+ case RECURSIVE_SET_ACL:
+ if (unbase64) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for ACLs.");
+ }
+ if (!i.argument) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
+ "Set ACLs requires argument.");
+ }
+ r = parse_acls_from_arg(&i);
+ if (r < 0)
+ return r;
+ break;
+
+ case SET_ATTRIBUTE:
+ case RECURSIVE_SET_ATTRIBUTE:
+ if (unbase64) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for file attributes.");
+ }
+ if (!i.argument) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
+ "Set file attribute requires argument.");
+ }
+ r = parse_attribute_from_arg(&i);
+ if (IN_SET(r, -EINVAL, -EBADSLT))
+ *invalid_config = true;
+ if (r < 0)
+ return r;
+ break;
+
+ default:
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
+ "Unknown command type '%c'.", (char) i.type);
+ }
+
+ if (!should_include_path(i.path))
+ return 0;
+
+ if (!unbase64) {
+ /* Do specifier expansion except if base64 mode is enabled */
+ r = specifier_expansion_from_arg(specifier_table, &i);
+ if (ERRNO_IS_NOINFO(r))
+ return log_unresolvable_specifier(fname, line);
+ if (r < 0) {
+ if (IN_SET(r, -EINVAL, -EBADSLT))
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
+ }
+ }
+
+ switch (i.type) {
+ case CREATE_SYMLINK:
+ if (!i.argument) {
+ i.argument = path_join("/usr/share/factory", i.path);
+ if (!i.argument)
+ return log_oom();
+ }
+ break;
+
+ case COPY_FILES:
+ if (!i.argument) {
+ i.argument = path_join("/usr/share/factory", i.path);
+ if (!i.argument)
+ return log_oom();
+ } else if (!path_is_absolute(i.argument)) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
+
+ }
+
+ if (!empty_or_root(arg_root)) {
+ char *p;
+
+ p = path_join(arg_root, i.argument);
+ if (!p)
+ return log_oom();
+ free_and_replace(i.argument, p);
+ }
+
+ path_simplify(i.argument);
+
+ if (laccess(i.argument, F_OK) == -ENOENT) {
+ /* Silently skip over lines where the source file is missing. */
+ log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Copy source path '%s' does not exist, skipping line.", i.argument);
+ return 0;
+ }
+
+ break;
+
+ default:
+ break;
+ }
+
+ if (from_cred) {
+ if (!i.argument)
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EINVAL), "Reading from credential requested, but no credential name specified.");
+ if (!credential_name_valid(i.argument))
+ return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EINVAL), "Credential name not valid: %s", i.argument);
+
+ r = read_credential(i.argument, &i.binary_argument, &i.binary_argument_size);
+ if (IN_SET(r, -ENXIO, -ENOENT)) {
+ /* Silently skip over lines that have no credentials passed */
+ log_syntax(NULL, LOG_DEBUG, fname, line, 0,
+ "Credential '%s' not specified, skipping line.", i.argument);
+ return 0;
+ }
+ if (r < 0)
+ return log_error_errno(r, "Failed to read credential '%s': %m", i.argument);
+ }
+
+ /* If base64 decoding is requested, do so now */
+ if (unbase64 && item_binary_argument(&i)) {
+ _cleanup_free_ void *data = NULL;
+ size_t data_size = 0;
+
+ r = unbase64mem(item_binary_argument(&i), item_binary_argument_size(&i), &data, &data_size);
+ if (r < 0)
+ return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to base64 decode specified argument '%s': %m", i.argument);
+
+ free_and_replace(i.binary_argument, data);
+ i.binary_argument_size = data_size;
+ }
+
+ if (!empty_or_root(arg_root)) {
+ char *p;
+
+ p = path_join(arg_root, i.path);
+ if (!p)
+ return log_oom();
+ free_and_replace(i.path, p);
+ }
+
+ if (!empty_or_dash(user)) {
+ const char *u;
+
+ u = startswith(user, ":");
+ if (u)
+ i.uid_only_create = true;
+ else
+ u = user;
+
+ r = find_uid(u, &i.uid, uid_cache);
+ if (r < 0) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", u);
+ }
+
+ i.uid_set = true;
+ }
+
+ if (!empty_or_dash(group)) {
+ const char *g;
+
+ g = startswith(group, ":");
+ if (g)
+ i.gid_only_create = true;
+ else
+ g = group;
+
+ r = find_gid(g, &i.gid, gid_cache);
+ if (r < 0) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s'.", g);
+ }
+
+ i.gid_set = true;
+ }
+
+ if (!empty_or_dash(mode)) {
+ const char *mm;
+ unsigned m;
+
+ for (mm = mode;; mm++) {
+ if (*mm == '~')
+ i.mask_perms = true;
+ else if (*mm == ':')
+ i.mode_only_create = true;
+ else
+ break;
+ }
+
+ r = parse_mode(mm, &m);
+ if (r < 0) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
+ }
+
+ i.mode = m;
+ i.mode_set = true;
+ } else
+ i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
+
+ if (!empty_or_dash(age)) {
+ const char *a = age;
+ _cleanup_free_ char *seconds = NULL, *age_by = NULL;
+
+ if (*a == '~') {
+ i.keep_first_level = true;
+ a++;
+ }
+
+ /* Format: "age-by:age"; where age-by is "[abcmABCM]+". */
+ r = split_pair(a, ":", &age_by, &seconds);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0 && r != -EINVAL)
+ return log_error_errno(r, "Failed to parse age-by for '%s': %m", age);
+ if (r >= 0) {
+ /* We found a ":", parse the "age-by" part. */
+ r = parse_age_by_from_arg(age_by, &i);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age-by '%s'.", age_by);
+ }
+
+ /* For parsing the "age" part, after the ":". */
+ a = seconds;
+ }
+
+ r = parse_sec(a, &i.age);
+ if (r < 0) {
+ *invalid_config = true;
+ return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", a);
+ }
+
+ i.age_set = true;
+ }
+
+ h = needs_glob(i.type) ? globs : items;
+
+ existing = ordered_hashmap_get(h, i.path);
+ if (existing) {
+ if (is_duplicated_item(existing, &i)) {
+ log_syntax(NULL, LOG_NOTICE, fname, line, 0,
+ "Duplicate line for path \"%s\", ignoring.", i.path);
+ return 0;
+ }
+ } else {
+ existing = new0(ItemArray, 1);
+ if (!existing)
+ return log_oom();
+
+ r = ordered_hashmap_put(h, i.path, existing);
+ if (r < 0) {
+ free(existing);
+ return log_oom();
+ }
+ }
+
+ if (!GREEDY_REALLOC(existing->items, existing->n_items + 1))
+ return log_oom();
+
+ existing->items[existing->n_items++] = i;
+ i = (struct Item) {};
+
+ /* Sort item array, to enforce stable ordering of application */
+ typesafe_qsort(existing->items, existing->n_items, item_compare);
+
+ return 0;
+}
+
+static int cat_config(char **config_dirs, char **args) {
+ _cleanup_strv_free_ char **files = NULL;
+ int r;
+
+ r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
+ if (r < 0)
+ return r;
+
+ return cat_files(NULL, files, 0);
+}
+
+static int exclude_default_prefixes(void) {
+ int r;
+
+ /* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in
+ * combination with --root= where we probably don't want to apply stuff to these dirs as they are
+ * likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have
+ * all kinds of files created/adjusted underneath these mount points. */
+
+ r = strv_extend_strv(
+ &arg_exclude_prefixes,
+ STRV_MAKE("/dev",
+ "/proc",
+ "/run",
+ "/sys"),
+ true);
+ if (r < 0)
+ return log_oom();
+
+ return 0;
+}
+
+static int help(void) {
+ _cleanup_free_ char *link = NULL;
+ int r;
+
+ r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
+ if (r < 0)
+ return log_oom();
+
+ printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n"
+ "\n%sCreates, deletes and cleans up volatile and temporary files and directories.%s\n\n"
+ " -h --help Show this help\n"
+ " --user Execute user configuration\n"
+ " --version Show package version\n"
+ " --cat-config Show configuration files\n"
+ " --create Create marked files/directories\n"
+ " --clean Clean up marked directories\n"
+ " --remove Remove marked files/directories\n"
+ " --boot Execute actions only safe at boot\n"
+ " --prefix=PATH Only apply rules with the specified prefix\n"
+ " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
+ " -E Ignore rules prefixed with /dev, /proc, /run, /sys\n"
+ " --root=PATH Operate on an alternate filesystem root\n"
+ " --image=PATH Operate on disk image as filesystem root\n"
+ " --replace=PATH Treat arguments as replacement for PATH\n"
+ " --no-pager Do not pipe output into a pager\n"
+ "\nSee the %s for details.\n",
+ program_invocation_short_name,
+ ansi_highlight(),
+ ansi_normal(),
+ link);
+
+ return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_VERSION = 0x100,
+ ARG_CAT_CONFIG,
+ ARG_USER,
+ ARG_CREATE,
+ ARG_CLEAN,
+ ARG_REMOVE,
+ ARG_BOOT,
+ ARG_PREFIX,
+ ARG_EXCLUDE_PREFIX,
+ ARG_ROOT,
+ ARG_IMAGE,
+ ARG_REPLACE,
+ ARG_NO_PAGER,
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "user", no_argument, NULL, ARG_USER },
+ { "version", no_argument, NULL, ARG_VERSION },
+ { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
+ { "create", no_argument, NULL, ARG_CREATE },
+ { "clean", no_argument, NULL, ARG_CLEAN },
+ { "remove", no_argument, NULL, ARG_REMOVE },
+ { "boot", no_argument, NULL, ARG_BOOT },
+ { "prefix", required_argument, NULL, ARG_PREFIX },
+ { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
+ { "root", required_argument, NULL, ARG_ROOT },
+ { "image", required_argument, NULL, ARG_IMAGE },
+ { "replace", required_argument, NULL, ARG_REPLACE },
+ { "no-pager", no_argument, NULL, ARG_NO_PAGER },
+ {}
+ };
+
+ int c, r;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0)
+
+ switch (c) {
+
+ case 'h':
+ return help();
+
+ case ARG_VERSION:
+ return version();
+
+ case ARG_CAT_CONFIG:
+ arg_cat_config = true;
+ break;
+
+ case ARG_USER:
+ arg_user = true;
+ break;
+
+ case ARG_CREATE:
+ arg_operation |= OPERATION_CREATE;
+ break;
+
+ case ARG_CLEAN:
+ arg_operation |= OPERATION_CLEAN;
+ break;
+
+ case ARG_REMOVE:
+ arg_operation |= OPERATION_REMOVE;
+ break;
+
+ case ARG_BOOT:
+ arg_boot = true;
+ break;
+
+ case ARG_PREFIX:
+ if (strv_push(&arg_include_prefixes, optarg) < 0)
+ return log_oom();
+ break;
+
+ case ARG_EXCLUDE_PREFIX:
+ if (strv_push(&arg_exclude_prefixes, optarg) < 0)
+ return log_oom();
+ break;
+
+ case ARG_ROOT:
+ r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_root);
+ if (r < 0)
+ return r;
+ break;
+
+ case ARG_IMAGE:
+#ifdef STANDALONE
+ return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+ "This systemd-tmpfiles version is compiled without support for --image=.");
+#else
+ r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_image);
+ if (r < 0)
+ return r;
+#endif
+ /* Imply -E here since it makes little sense to create files persistently in the /run mountpoint of a disk image */
+ _fallthrough_;
+
+ case 'E':
+ r = exclude_default_prefixes();
+ if (r < 0)
+ return r;
+
+ break;
+
+ case ARG_REPLACE:
+ if (!path_is_absolute(optarg) ||
+ !endswith(optarg, ".conf"))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "The argument to --replace= must an absolute path to a config file");
+
+ arg_replace = optarg;
+ break;
+
+ case ARG_NO_PAGER:
+ arg_pager_flags |= PAGER_DISABLE;
+ break;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached();
+ }
+
+ if (arg_operation == 0 && !arg_cat_config)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "You need to specify at least one of --clean, --create or --remove.");
+
+ if (arg_replace && arg_cat_config)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Option --replace= is not supported with --cat-config");
+
+ if (arg_replace && optind >= argc)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "When --replace= is given, some configuration items must be specified");
+
+ if (arg_root && arg_user)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Combination of --user and --root= is not supported.");
+
+ if (arg_image && arg_root)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
+
+ return 1;
+}
+
+static int read_config_file(
+ char **config_dirs,
+ const char *fn,
+ bool ignore_enoent,
+ bool *invalid_config) {
+
+ _cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
+ _cleanup_fclose_ FILE *_f = NULL;
+ _cleanup_free_ char *pp = NULL;
+ unsigned v = 0;
+ FILE *f;
+ ItemArray *ia;
+ int r = 0;
+
+ assert(fn);
+
+ if (streq(fn, "-")) {
+ log_debug("Reading config from stdin%s", special_glyph(SPECIAL_GLYPH_ELLIPSIS));
+ fn = "<stdin>";
+ f = stdin;
+ } else {
+ r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f, &pp);
+ if (r < 0) {
+ if (ignore_enoent && r == -ENOENT) {
+ log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
+ return 0;
+ }
+
+ return log_error_errno(r, "Failed to open '%s': %m", fn);
+ }
+
+ log_debug("Reading config file \"%s\"%s", pp, special_glyph(SPECIAL_GLYPH_ELLIPSIS));
+ fn = pp;
+ f = _f;
+ }
+
+ for (;;) {
+ _cleanup_free_ char *line = NULL;
+ bool invalid_line = false;
+ char *l;
+ int k;
+
+ k = read_line(f, LONG_LINE_MAX, &line);
+ if (k < 0)
+ return log_error_errno(k, "Failed to read '%s': %m", fn);
+ if (k == 0)
+ break;
+
+ v++;
+
+ l = strstrip(line);
+ if (IN_SET(*l, 0, '#'))
+ continue;
+
+ k = parse_line(fn, v, l, &invalid_line, &uid_cache, &gid_cache);
+ if (k < 0) {
+ if (invalid_line)
+ /* Allow reporting with a special code if the caller requested this */
+ *invalid_config = true;
+ else if (r == 0)
+ /* The first error becomes our return value */
+ r = k;
+ }
+ }
+
+ /* we have to determine age parameter for each entry of type X */
+ ORDERED_HASHMAP_FOREACH(ia, globs)
+ for (size_t ni = 0; ni < ia->n_items; ni++) {
+ ItemArray *ja;
+ Item *i = ia->items + ni, *candidate_item = NULL;
+
+ if (i->type != IGNORE_DIRECTORY_PATH)
+ continue;
+
+ ORDERED_HASHMAP_FOREACH(ja, items)
+ for (size_t nj = 0; nj < ja->n_items; nj++) {
+ Item *j = ja->items + nj;
+
+ if (!IN_SET(j->type, CREATE_DIRECTORY,
+ TRUNCATE_DIRECTORY,
+ CREATE_SUBVOLUME,
+ CREATE_SUBVOLUME_INHERIT_QUOTA,
+ CREATE_SUBVOLUME_NEW_QUOTA))
+ continue;
+
+ if (path_equal(j->path, i->path)) {
+ candidate_item = j;
+ break;
+ }
+
+ if (candidate_item
+ ? (path_startswith(j->path, candidate_item->path) && fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)
+ : path_startswith(i->path, j->path) != NULL)
+ candidate_item = j;
+ }
+
+ if (candidate_item && candidate_item->age_set) {
+ i->age = candidate_item->age;
+ i->age_set = true;
+ }
+ }
+
+ if (ferror(f)) {
+ log_error_errno(errno, "Failed to read from file %s: %m", fn);
+ if (r == 0)
+ r = -EIO;
+ }
+
+ return r;
+}
+
+static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
+ int r;
+
+ STRV_FOREACH(arg, args) {
+ r = read_config_file(config_dirs, *arg, false, invalid_config);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
+ _cleanup_strv_free_ char **files = NULL;
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(f, files)
+ if (p && path_equal(*f, p)) {
+ log_debug("Parsing arguments at position \"%s\"%s", *f, special_glyph(SPECIAL_GLYPH_ELLIPSIS));
+
+ r = parse_arguments(config_dirs, args, invalid_config);
+ if (r < 0)
+ return r;
+ } else
+ /* Just warn, ignore result otherwise.
+ * read_config_file() has some debug output, so no need to print anything. */
+ (void) read_config_file(config_dirs, *f, true, invalid_config);
+
+ return 0;
+}
+
+static int read_credential_lines(bool *invalid_config) {
+ _cleanup_free_ char *j = NULL;
+ const char *d;
+ int r;
+
+ r = get_credentials_dir(&d);
+ if (r == -ENXIO)
+ return 0;
+ if (r < 0)
+ return log_error_errno(r, "Failed to get credentials directory: %m");
+
+ j = path_join(d, "tmpfiles.extra");
+ if (!j)
+ return log_oom();
+
+ (void) read_config_file(/* config_dirs= */ NULL, j, /* ignore_enoent= */ true, invalid_config);
+ return 0;
+}
+
+static int link_parent(ItemArray *a) {
+ const char *path;
+ char *prefix;
+ int r;
+
+ assert(a);
+
+ /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
+ * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
+ * before their children, and clean up/remove children before their parents. */
+
+ if (a->n_items <= 0)
+ return 0;
+
+ path = a->items[0].path;
+ prefix = newa(char, strlen(path) + 1);
+ PATH_FOREACH_PREFIX(prefix, path) {
+ ItemArray *j;
+
+ j = ordered_hashmap_get(items, prefix);
+ if (!j)
+ j = ordered_hashmap_get(globs, prefix);
+ if (j) {
+ r = set_ensure_put(&j->children, NULL, a);
+ if (r < 0)
+ return log_oom();
+
+ a->parent = j;
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
+ ItemArray, item_array_free);
+
+static int run(int argc, char *argv[]) {
+#ifndef STANDALONE
+ _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
+ _cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
+#endif
+ _cleanup_strv_free_ char **config_dirs = NULL;
+ bool invalid_config = false;
+ ItemArray *a;
+ enum {
+ PHASE_REMOVE_AND_CLEAN,
+ PHASE_CREATE,
+ _PHASE_MAX
+ } phase;
+ int r, k;
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ return r;
+
+ log_setup();
+
+ /* We require /proc/ for a lot of our operations, i.e. for adjusting access modes, for anything
+ * SELinux related, for recursive operation, for xattr, acl and chattr handling, for btrfs stuff and
+ * a lot more. It's probably the majority of invocations where /proc/ is required. Since people
+ * apparently invoke it without anyway and are surprised about the failures, let's catch this early
+ * and output a nice and friendly warning. */
+ if (proc_mounted() == 0)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOSYS),
+ "/proc/ is not mounted, but required for successful operation of systemd-tmpfiles. "
+ "Please mount /proc/. Alternatively, consider using the --root= or --image= switches.");
+
+ /* Descending down file system trees might take a lot of fds */
+ (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
+
+ if (arg_user) {
+ r = user_config_paths(&config_dirs);
+ if (r < 0)
+ return log_error_errno(r, "Failed to initialize configuration directory list: %m");
+ } else {
+ config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
+ if (!config_dirs)
+ return log_oom();
+ }
+
+ if (DEBUG_LOGGING) {
+ _cleanup_free_ char *t = NULL;
+
+ STRV_FOREACH(i, config_dirs) {
+ _cleanup_free_ char *j = NULL;
+
+ j = path_join(arg_root, *i);
+ if (!j)
+ return log_oom();
+
+ if (!strextend(&t, "\n\t", j))
+ return log_oom();
+ }
+
+ log_debug("Looking for configuration files in (higher priority first):%s", t);
+ }
+
+ if (arg_cat_config) {
+ pager_open(arg_pager_flags);
+
+ return cat_config(config_dirs, argv + optind);
+ }
+
+ umask(0022);
+
+ r = mac_selinux_init();
+ if (r < 0)
+ return r;
+
+#ifndef STANDALONE
+ if (arg_image) {
+ assert(!arg_root);
+
+ r = mount_image_privately_interactively(
+ arg_image,
+ DISSECT_IMAGE_GENERIC_ROOT |
+ DISSECT_IMAGE_REQUIRE_ROOT |
+ DISSECT_IMAGE_VALIDATE_OS |
+ DISSECT_IMAGE_RELAX_VAR_CHECK |
+ DISSECT_IMAGE_FSCK |
+ DISSECT_IMAGE_GROWFS,
+ &unlink_dir,
+ &loop_device);
+ if (r < 0)
+ return r;
+
+ arg_root = strdup(unlink_dir);
+ if (!arg_root)
+ return log_oom();
+ }
+#else
+ assert(!arg_image);
+#endif
+
+ items = ordered_hashmap_new(&item_array_hash_ops);
+ globs = ordered_hashmap_new(&item_array_hash_ops);
+ if (!items || !globs)
+ return log_oom();
+
+ /* If command line arguments are specified along with --replace, read all
+ * configuration files and insert the positional arguments at the specified
+ * place. Otherwise, if command line arguments are specified, execute just
+ * them, and finally, without --replace= or any positional arguments, just
+ * read configuration and execute it.
+ */
+ if (arg_replace || optind >= argc)
+ r = read_config_files(config_dirs, argv + optind, &invalid_config);
+ else
+ r = parse_arguments(config_dirs, argv + optind, &invalid_config);
+ if (r < 0)
+ return r;
+
+ r = read_credential_lines(&invalid_config);
+ if (r < 0)
+ return r;
+
+ /* Let's now link up all child/parent relationships */
+ ORDERED_HASHMAP_FOREACH(a, items) {
+ r = link_parent(a);
+ if (r < 0)
+ return r;
+ }
+ ORDERED_HASHMAP_FOREACH(a, globs) {
+ r = link_parent(a);
+ if (r < 0)
+ return r;
+ }
+
+ /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
+ * operations. i.e. that we first clean out the platform we then build on. */
+ for (phase = 0; phase < _PHASE_MAX; phase++) {
+ OperationMask op;
+
+ if (phase == PHASE_REMOVE_AND_CLEAN)
+ op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
+ else if (phase == PHASE_CREATE)
+ op = arg_operation & OPERATION_CREATE;
+ else
+ assert_not_reached();
+
+ if (op == 0) /* Nothing requested in this phase */
+ continue;
+
+ /* The non-globbing ones usually create things, hence we apply them first */
+ ORDERED_HASHMAP_FOREACH(a, items) {
+ k = process_item_array(a, op);
+ if (k < 0 && r >= 0)
+ r = k;
+ }
+
+ /* The globbing ones usually alter things, hence we apply them second. */
+ ORDERED_HASHMAP_FOREACH(a, globs) {
+ k = process_item_array(a, op);
+ if (k < 0 && r >= 0)
+ r = k;
+ }
+ }
+
+ if (ERRNO_IS_RESOURCE(r))
+ return r;
+ if (invalid_config)
+ return EX_DATAERR;
+ if (r < 0)
+ return EX_CANTCREAT;
+ return 0;
+}
+
+DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 06:07:19 +0000