diff options
Diffstat (limited to 'src/portable/portable.c')
| -rw-r--r-- | src/portable/portable.c | 1443 |
1 files changed, 1443 insertions, 0 deletions
diff --git a/src/portable/portable.c b/src/portable/portable.c new file mode 100644 index 0000000..01fd1a9 --- /dev/null +++ b/src/portable/portable.c @@ -0,0 +1,1443 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include <stdio_ext.h> + +#include "bus-common-errors.h" +#include "bus-error.h" +#include "conf-files.h" +#include "copy.h" +#include "def.h" +#include "dirent-util.h" +#include "dissect-image.h" +#include "fd-util.h" +#include "fileio.h" +#include "fs-util.h" +#include "io-util.h" +#include "locale-util.h" +#include "loop-util.h" +#include "machine-image.h" +#include "mkdir.h" +#include "os-util.h" +#include "path-lookup.h" +#include "portable.h" +#include "process-util.h" +#include "set.h" +#include "signal-util.h" +#include "socket-util.h" +#include "string-table.h" +#include "strv.h" +#include "tmpfile-util.h" +#include "user-util.h" + +static const char profile_dirs[] = CONF_PATHS_NULSTR("systemd/portable/profile"); + +/* Markers used in the first line of our 20-portable.conf unit file drop-in to determine, that a) the unit file was + * dropped there by the portable service logic and b) for which image it was dropped there. */ +#define PORTABLE_DROPIN_MARKER_BEGIN "# Drop-in created for image '" +#define PORTABLE_DROPIN_MARKER_END "', do not edit." + +static bool prefix_match(const char *unit, const char *prefix) { + const char *p; + + p = startswith(unit, prefix); + if (!p) + return false; + + /* Only respect prefixes followed by dash or dot or when there's a complete match */ + return IN_SET(*p, '-', '.', '@', 0); +} + +static bool unit_match(const char *unit, char **matches) { + const char *dot; + char **i; + + dot = strrchr(unit, '.'); + if (!dot) + return false; + + if (!STR_IN_SET(dot, ".service", ".socket", ".target", ".timer", ".path")) + return false; + + /* Empty match expression means: everything */ + if (strv_isempty(matches)) + return true; + + /* Otherwise, at least one needs to match */ + STRV_FOREACH(i, matches) + if (prefix_match(unit, *i)) + return true; + + return false; +} + +static PortableMetadata *portable_metadata_new(const char *name, int fd) { + PortableMetadata *m; + + m = malloc0(offsetof(PortableMetadata, name) + strlen(name) + 1); + if (!m) + return NULL; + + strcpy(m->name, name); + m->fd = fd; + + return m; +} + +PortableMetadata *portable_metadata_unref(PortableMetadata *i) { + if (!i) + return NULL; + + safe_close(i->fd); + free(i->source); + + return mfree(i); +} + +static int compare_metadata(PortableMetadata *const *x, PortableMetadata *const *y) { + return strcmp((*x)->name, (*y)->name); +} + +int portable_metadata_hashmap_to_sorted_array(Hashmap *unit_files, PortableMetadata ***ret) { + + _cleanup_free_ PortableMetadata **sorted = NULL; + Iterator iterator; + PortableMetadata *item; + size_t k = 0; + + sorted = new(PortableMetadata*, hashmap_size(unit_files)); + if (!sorted) + return -ENOMEM; + + HASHMAP_FOREACH(item, unit_files, iterator) + sorted[k++] = item; + + assert(k == hashmap_size(unit_files)); + + typesafe_qsort(sorted, k, compare_metadata); + + *ret = TAKE_PTR(sorted); + return 0; +} + +static int send_item( + int socket_fd, + const char *name, + int fd) { + + union { + struct cmsghdr cmsghdr; + uint8_t buf[CMSG_SPACE(sizeof(int))]; + } control = {}; + struct iovec iovec; + struct msghdr mh = { + .msg_control = &control, + .msg_controllen = sizeof(control), + .msg_iov = &iovec, + .msg_iovlen = 1, + }; + struct cmsghdr *cmsg; + _cleanup_close_ int data_fd = -1; + + assert(socket_fd >= 0); + assert(name); + assert(fd >= 0); + + data_fd = fd_duplicate_data_fd(fd); + if (data_fd < 0) + return data_fd; + + cmsg = CMSG_FIRSTHDR(&mh); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + cmsg->cmsg_len = CMSG_LEN(sizeof(int)); + memcpy(CMSG_DATA(cmsg), &data_fd, sizeof(int)); + + mh.msg_controllen = CMSG_SPACE(sizeof(int)); + iovec = IOVEC_MAKE_STRING(name); + + if (sendmsg(socket_fd, &mh, MSG_NOSIGNAL) < 0) + return -errno; + + return 0; +} + +static int recv_item( + int socket_fd, + char **ret_name, + int *ret_fd) { + + union { + struct cmsghdr cmsghdr; + uint8_t buf[CMSG_SPACE(sizeof(int))]; + } control = {}; + char buffer[PATH_MAX+2]; + struct iovec iov = IOVEC_INIT(buffer, sizeof(buffer)-1); + struct msghdr mh = { + .msg_control = &control, + .msg_controllen = sizeof(control), + .msg_iov = &iov, + .msg_iovlen = 1, + }; + struct cmsghdr *cmsg; + _cleanup_close_ int found_fd = -1; + char *copy; + ssize_t n; + + assert(socket_fd >= 0); + assert(ret_name); + assert(ret_fd); + + n = recvmsg(socket_fd, &mh, MSG_CMSG_CLOEXEC); + if (n < 0) + return -errno; + + CMSG_FOREACH(cmsg, &mh) { + if (cmsg->cmsg_level == SOL_SOCKET && + cmsg->cmsg_type == SCM_RIGHTS) { + + if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { + assert(found_fd < 0); + found_fd = *(int*) CMSG_DATA(cmsg); + break; + } + + cmsg_close_all(&mh); + return -EIO; + } + } + + buffer[n] = 0; + + copy = strdup(buffer); + if (!copy) + return -ENOMEM; + + *ret_name = copy; + *ret_fd = TAKE_FD(found_fd); + + return 0; +} + +DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(portable_metadata_hash_ops, char, string_hash_func, string_compare_func, + PortableMetadata, portable_metadata_unref); + +static int extract_now( + const char *where, + char **matches, + int socket_fd, + PortableMetadata **ret_os_release, + Hashmap **ret_unit_files) { + + _cleanup_hashmap_free_ Hashmap *unit_files = NULL; + _cleanup_(portable_metadata_unrefp) PortableMetadata *os_release = NULL; + _cleanup_(lookup_paths_free) LookupPaths paths = {}; + _cleanup_close_ int os_release_fd = -1; + _cleanup_free_ char *os_release_path = NULL; + char **i; + int r; + + /* Extracts the metadata from a directory tree 'where'. Extracts two kinds of information: the /etc/os-release + * data, and all unit files matching the specified expression. Note that this function is called in two very + * different but also similar contexts. When the tool gets invoked on a directory tree, we'll process it + * directly, and in-process, and thus can return the requested data directly, via 'ret_os_release' and + * 'ret_unit_files'. However, if the tool is invoked on a raw disk image — which needs to be mounted first — we + * are invoked in a child process with private mounts and then need to send the collected data to our + * parent. To handle both cases in one call this function also gets a 'socket_fd' parameter, which when >= 0 is + * used to send the data to the parent. */ + + assert(where); + + /* First, find /etc/os-release and send it upstream (or just save it). */ + r = open_os_release(where, &os_release_path, &os_release_fd); + if (r < 0) + log_debug_errno(r, "Couldn't acquire os-release file, ignoring: %m"); + else { + if (socket_fd >= 0) { + r = send_item(socket_fd, "/etc/os-release", os_release_fd); + if (r < 0) + return log_debug_errno(r, "Failed to send os-release file: %m"); + } + + if (ret_os_release) { + os_release = portable_metadata_new("/etc/os-release", os_release_fd); + if (!os_release) + return -ENOMEM; + + os_release_fd = -1; + os_release->source = TAKE_PTR(os_release_path); + } + } + + /* Then, send unit file data to the parent (or/and add it to the hashmap). For that we use our usual unit + * discovery logic. Note that we force looking inside of /lib/systemd/system/ for units too, as we mightbe + * compiled for a split-usr system but the image might be a legacy-usr one. */ + r = lookup_paths_init(&paths, UNIT_FILE_SYSTEM, LOOKUP_PATHS_SPLIT_USR, where); + if (r < 0) + return log_debug_errno(r, "Failed to acquire lookup paths: %m"); + + unit_files = hashmap_new(&portable_metadata_hash_ops); + if (!unit_files) + return -ENOMEM; + + STRV_FOREACH(i, paths.search_path) { + _cleanup_free_ char *resolved = NULL; + _cleanup_closedir_ DIR *d = NULL; + struct dirent *de; + + r = chase_symlinks_and_opendir(*i, where, 0, &resolved, &d); + if (r < 0) { + log_debug_errno(r, "Failed to open unit path '%s', ignoring: %m", *i); + continue; + } + + FOREACH_DIRENT(de, d, return log_debug_errno(errno, "Failed to read directory: %m")) { + _cleanup_(portable_metadata_unrefp) PortableMetadata *m = NULL; + _cleanup_close_ int fd = -1; + + if (!unit_name_is_valid(de->d_name, UNIT_NAME_ANY)) + continue; + + if (!unit_match(de->d_name, matches)) + continue; + + /* Filter out duplicates */ + if (hashmap_get(unit_files, de->d_name)) + continue; + + dirent_ensure_type(d, de); + if (!IN_SET(de->d_type, DT_LNK, DT_REG)) + continue; + + fd = openat(dirfd(d), de->d_name, O_CLOEXEC|O_RDONLY); + if (fd < 0) { + log_debug_errno(errno, "Failed to open unit file '%s', ignoring: %m", de->d_name); + continue; + } + + if (socket_fd >= 0) { + r = send_item(socket_fd, de->d_name, fd); + if (r < 0) + return log_debug_errno(r, "Failed to send unit metadata to parent: %m"); + } + + m = portable_metadata_new(de->d_name, fd); + if (!m) + return -ENOMEM; + fd = -1; + + m->source = strjoin(resolved, "/", de->d_name); + if (!m->source) + return -ENOMEM; + + r = hashmap_put(unit_files, m->name, m); + if (r < 0) + return log_debug_errno(r, "Failed to add unit to hashmap: %m"); + m = NULL; + } + } + + if (ret_os_release) + *ret_os_release = TAKE_PTR(os_release); + if (ret_unit_files) + *ret_unit_files = TAKE_PTR(unit_files); + + return 0; +} + +static int portable_extract_by_path( + const char *path, + char **matches, + PortableMetadata **ret_os_release, + Hashmap **ret_unit_files, + sd_bus_error *error) { + + _cleanup_hashmap_free_ Hashmap *unit_files = NULL; + _cleanup_(portable_metadata_unrefp) PortableMetadata* os_release = NULL; + _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; + int r; + + assert(path); + + r = loop_device_make_by_path(path, O_RDONLY, &d); + if (r == -EISDIR) { + /* We can't turn this into a loop-back block device, and this returns EISDIR? Then this is a directory + * tree and not a raw device. It's easy then. */ + + r = extract_now(path, matches, -1, &os_release, &unit_files); + if (r < 0) + return r; + + } else if (r < 0) + return log_debug_errno(r, "Failed to set up loopback device: %m"); + else { + _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; + _cleanup_(rmdir_and_freep) char *tmpdir = NULL; + _cleanup_(close_pairp) int seq[2] = { -1, -1 }; + _cleanup_(sigkill_waitp) pid_t child = 0; + + /* We now have a loopback block device, let's fork off a child in its own mount namespace, mount it + * there, and extract the metadata we need. The metadata is sent from the child back to us. */ + + BLOCK_SIGNALS(SIGCHLD); + + r = mkdtemp_malloc("/tmp/inspect-XXXXXX", &tmpdir); + if (r < 0) + return log_debug_errno(r, "Failed to create temporary directory: %m"); + + r = dissect_image(d->fd, NULL, 0, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_DISCARD_ON_LOOP, &m); + if (r == -ENOPKG) + sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Couldn't identify a suitable partition table or file system in '%s'.", path); + else if (r == -EADDRNOTAVAIL) + sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "No root partition for specified root hash found in '%s'.", path); + else if (r == -ENOTUNIQ) + sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Multiple suitable root partitions found in image '%s'.", path); + else if (r == -ENXIO) + sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "No suitable root partition found in image '%s'.", path); + else if (r == -EPROTONOSUPPORT) + sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", path); + if (r < 0) + return r; + + if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, seq) < 0) + return log_debug_errno(errno, "Failed to allocated SOCK_SEQPACKET socket: %m"); + + r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE|FORK_LOG, &child); + if (r < 0) + return r; + if (r == 0) { + seq[0] = safe_close(seq[0]); + + r = dissected_image_mount(m, tmpdir, UID_INVALID, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_VALIDATE_OS); + if (r < 0) { + log_debug_errno(r, "Failed to mount dissected image: %m"); + goto child_finish; + } + + r = extract_now(tmpdir, matches, seq[1], NULL, NULL); + + child_finish: + _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); + } + + seq[1] = safe_close(seq[1]); + + unit_files = hashmap_new(&portable_metadata_hash_ops); + if (!unit_files) + return -ENOMEM; + + for (;;) { + _cleanup_(portable_metadata_unrefp) PortableMetadata *add = NULL; + _cleanup_free_ char *name = NULL; + _cleanup_close_ int fd = -1; + + r = recv_item(seq[0], &name, &fd); + if (r < 0) + return log_debug_errno(r, "Failed to receive item: %m"); + + /* We can't really distuingish a zero-length datagram without any fds from EOF (both are signalled the + * same way by recvmsg()). Hence, accept either as end notification. */ + if (isempty(name) && fd < 0) + break; + + if (isempty(name) || fd < 0) { + log_debug("Invalid item sent from child."); + return -EINVAL; + } + + add = portable_metadata_new(name, fd); + if (!add) + return -ENOMEM; + fd = -1; + + /* Note that we do not initialize 'add->source' here, as the source path is not usable here as + * it refers to a path only valid in the short-living namespaced child process we forked + * here. */ + + if (PORTABLE_METADATA_IS_UNIT(add)) { + r = hashmap_put(unit_files, add->name, add); + if (r < 0) + return log_debug_errno(r, "Failed to add item to unit file list: %m"); + + add = NULL; + + } else if (PORTABLE_METADATA_IS_OS_RELEASE(add)) { + + assert(!os_release); + os_release = TAKE_PTR(add); + } else + assert_not_reached("Unexpected metadata item from child."); + } + + r = wait_for_terminate_and_check("(sd-dissect)", child, 0); + if (r < 0) + return r; + child = 0; + } + + if (!os_release) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Image '%s' lacks os-release data, refusing.", path); + + if (hashmap_isempty(unit_files)) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Couldn't find any matching unit files in image '%s', refusing.", path); + + if (ret_unit_files) + *ret_unit_files = TAKE_PTR(unit_files); + + if (ret_os_release) + *ret_os_release = TAKE_PTR(os_release); + + return 0; +} + +int portable_extract( + const char *name_or_path, + char **matches, + PortableMetadata **ret_os_release, + Hashmap **ret_unit_files, + sd_bus_error *error) { + + _cleanup_(image_unrefp) Image *image = NULL; + int r; + + assert(name_or_path); + + r = image_find_harder(IMAGE_PORTABLE, name_or_path, &image); + if (r < 0) + return r; + + return portable_extract_by_path(image->path, matches, ret_os_release, ret_unit_files, error); +} + +static int unit_file_is_active( + sd_bus *bus, + const char *name, + sd_bus_error *error) { + + static const char *const active_states[] = { + "activating", + "active", + "reloading", + "deactivating", + NULL, + }; + int r; + + if (!bus) + return false; + + /* If we are looking at a plain or instance things are easy, we can just query the state */ + if (unit_name_is_valid(name, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) { + _cleanup_free_ char *path = NULL, *buf = NULL; + + path = unit_dbus_path_from_name(name); + if (!path) + return -ENOMEM; + + r = sd_bus_get_property_string( + bus, + "org.freedesktop.systemd1", + path, + "org.freedesktop.systemd1.Unit", + "ActiveState", + error, + &buf); + if (r < 0) + return log_debug_errno(r, "Failed to retrieve unit state: %s", bus_error_message(error, r)); + + return strv_contains((char**) active_states, buf); + } + + /* Otherwise we need to enumerate. But let's build the most restricted query we can */ + if (unit_name_is_valid(name, UNIT_NAME_TEMPLATE)) { + _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL; + const char *at, *prefix, *joined; + + r = sd_bus_message_new_method_call( + bus, + &m, + "org.freedesktop.systemd1", + "/org/freedesktop/systemd1", + "org.freedesktop.systemd1.Manager", + "ListUnitsByPatterns"); + if (r < 0) + return r; + + r = sd_bus_message_append_strv(m, (char**) active_states); + if (r < 0) + return r; + + at = strchr(name, '@'); + assert(at); + + prefix = strndupa(name, at + 1 - name); + joined = strjoina(prefix, "*", at + 1); + + r = sd_bus_message_append_strv(m, STRV_MAKE(joined)); + if (r < 0) + return r; + + r = sd_bus_call(bus, m, 0, error, &reply); + if (r < 0) + return log_debug_errno(r, "Failed to list units: %s", bus_error_message(error, r)); + + r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssssouso)"); + if (r < 0) + return r; + + r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_STRUCT, "ssssssouso"); + if (r < 0) + return r; + + return r > 0; + } + + return -EINVAL; +} + +static int portable_changes_add( + PortableChange **changes, + size_t *n_changes, + PortableChangeType type, + const char *path, + const char *source) { + + _cleanup_free_ char *p = NULL, *s = NULL; + PortableChange *c; + + assert(path); + assert(!changes == !n_changes); + + if (!changes) + return 0; + + c = reallocarray(*changes, *n_changes + 1, sizeof(PortableChange)); + if (!c) + return -ENOMEM; + *changes = c; + + p = strdup(path); + if (!p) + return -ENOMEM; + + path_simplify(p, false); + + if (source) { + s = strdup(source); + if (!s) + return -ENOMEM; + + path_simplify(s, false); + } + + c[(*n_changes)++] = (PortableChange) { + .type = type, + .path = TAKE_PTR(p), + .source = TAKE_PTR(s), + }; + + return 0; +} + +static int portable_changes_add_with_prefix( + PortableChange **changes, + size_t *n_changes, + PortableChangeType type, + const char *prefix, + const char *path, + const char *source) { + + assert(path); + assert(!changes == !n_changes); + + if (!changes) + return 0; + + if (prefix) { + path = strjoina(prefix, "/", path); + + if (source) + source = strjoina(prefix, "/", source); + } + + return portable_changes_add(changes, n_changes, type, path, source); +} + +void portable_changes_free(PortableChange *changes, size_t n_changes) { + size_t i; + + assert(changes || n_changes == 0); + + for (i = 0; i < n_changes; i++) { + free(changes[i].path); + free(changes[i].source); + } + + free(changes); +} + +static int install_chroot_dropin( + const char *image_path, + ImageType type, + const PortableMetadata *m, + const char *dropin_dir, + char **ret_dropin, + PortableChange **changes, + size_t *n_changes) { + + _cleanup_free_ char *text = NULL, *dropin = NULL; + int r; + + assert(image_path); + assert(m); + assert(dropin_dir); + + dropin = strjoin(dropin_dir, "/20-portable.conf"); + if (!dropin) + return -ENOMEM; + + text = strjoin(PORTABLE_DROPIN_MARKER_BEGIN, image_path, PORTABLE_DROPIN_MARKER_END "\n"); + if (!text) + return -ENOMEM; + + if (endswith(m->name, ".service")) + if (!strextend(&text, + "\n" + "[Service]\n", + IN_SET(type, IMAGE_DIRECTORY, IMAGE_SUBVOLUME) ? "RootDirectory=" : "RootImage=", image_path, "\n" + "Environment=PORTABLE=", basename(image_path), "\n" + "LogExtraFields=PORTABLE=", basename(image_path), "\n", + NULL)) + + return -ENOMEM; + + r = write_string_file(dropin, text, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC); + if (r < 0) + return log_debug_errno(r, "Failed to write '%s': %m", dropin); + + (void) portable_changes_add(changes, n_changes, PORTABLE_WRITE, dropin, NULL); + + if (ret_dropin) + *ret_dropin = TAKE_PTR(dropin); + + return 0; +} + +static int find_profile(const char *name, const char *unit, char **ret) { + const char *p, *dot; + + assert(name); + assert(ret); + + assert_se(dot = strrchr(unit, '.')); + + NULSTR_FOREACH(p, profile_dirs) { + _cleanup_free_ char *joined; + + joined = strjoin(p, "/", name, "/", dot + 1, ".conf"); + if (!joined) + return -ENOMEM; + + if (laccess(joined, F_OK) >= 0) { + *ret = TAKE_PTR(joined); + return 0; + } + + if (errno != ENOENT) + return -errno; + } + + return -ENOENT; +} + +static int install_profile_dropin( + const char *image_path, + const PortableMetadata *m, + const char *dropin_dir, + const char *profile, + PortableFlags flags, + char **ret_dropin, + PortableChange **changes, + size_t *n_changes) { + + _cleanup_free_ char *dropin = NULL, *from = NULL; + int r; + + assert(image_path); + assert(m); + assert(dropin_dir); + + if (!profile) + return 0; + + r = find_profile(profile, m->name, &from); + if (r < 0) { + if (r != -ENOENT) + return log_debug_errno(errno, "Profile '%s' is not accessible: %m", profile); + + log_debug_errno(errno, "Skipping link to profile '%s', as it does not exist: %m", profile); + return 0; + } + + dropin = strjoin(dropin_dir, "/10-profile.conf"); + if (!dropin) + return -ENOMEM; + + if (flags & PORTABLE_PREFER_COPY) { + + r = copy_file_atomic(from, dropin, 0644, 0, COPY_REFLINK); + if (r < 0) + return log_debug_errno(r, "Failed to copy %s %s %s: %m", from, special_glyph(SPECIAL_GLYPH_ARROW), dropin); + + (void) portable_changes_add(changes, n_changes, PORTABLE_COPY, dropin, from); + + } else { + + if (symlink(from, dropin) < 0) + return log_debug_errno(errno, "Failed to link %s %s %s: %m", from, special_glyph(SPECIAL_GLYPH_ARROW), dropin); + + (void) portable_changes_add(changes, n_changes, PORTABLE_SYMLINK, dropin, from); + } + + if (ret_dropin) + *ret_dropin = TAKE_PTR(dropin); + + return 0; +} + +static const char *attached_path(const LookupPaths *paths, PortableFlags flags) { + const char *where; + + assert(paths); + + if (flags & PORTABLE_RUNTIME) + where = paths->runtime_attached; + else + where = paths->persistent_attached; + + assert(where); + return where; +} + +static int attach_unit_file( + const LookupPaths *paths, + const char *image_path, + ImageType type, + const PortableMetadata *m, + const char *profile, + PortableFlags flags, + PortableChange **changes, + size_t *n_changes) { + + _cleanup_(unlink_and_freep) char *chroot_dropin = NULL, *profile_dropin = NULL; + _cleanup_(rmdir_and_freep) char *dropin_dir = NULL; + const char *where, *path; + int r; + + assert(paths); + assert(image_path); + assert(m); + assert(PORTABLE_METADATA_IS_UNIT(m)); + + where = attached_path(paths, flags); + + (void) mkdir_parents(where, 0755); + if (mkdir(where, 0755) < 0) { + if (errno != EEXIST) + return -errno; + } else + (void) portable_changes_add(changes, n_changes, PORTABLE_MKDIR, where, NULL); + + path = strjoina(where, "/", m->name); + dropin_dir = strjoin(path, ".d"); + if (!dropin_dir) + return -ENOMEM; + + if (mkdir(dropin_dir, 0755) < 0) { + if (errno != EEXIST) + return -errno; + } else + (void) portable_changes_add(changes, n_changes, PORTABLE_MKDIR, dropin_dir, NULL); + + /* We install the drop-ins first, and the actual unit file last to achieve somewhat atomic behaviour if PID 1 + * is reloaded while we are creating things here: as long as only the drop-ins exist the unit doesn't exist at + * all for PID 1. */ + + r = install_chroot_dropin(image_path, type, m, dropin_dir, &chroot_dropin, changes, n_changes); + if (r < 0) + return r; + + r = install_profile_dropin(image_path, m, dropin_dir, profile, flags, &profile_dropin, changes, n_changes); + if (r < 0) + return r; + + if ((flags & PORTABLE_PREFER_SYMLINK) && m->source) { + + if (symlink(m->source, path) < 0) + return log_debug_errno(errno, "Failed to symlink unit file '%s': %m", path); + + (void) portable_changes_add(changes, n_changes, PORTABLE_SYMLINK, path, m->source); + + } else { + _cleanup_(unlink_and_freep) char *tmp = NULL; + _cleanup_close_ int fd = -1; + + fd = open_tmpfile_linkable(where, O_WRONLY|O_CLOEXEC, &tmp); + if (fd < 0) + return log_debug_errno(fd, "Failed to create unit file '%s': %m", path); + + r = copy_bytes(m->fd, fd, UINT64_MAX, COPY_REFLINK); + if (r < 0) + return log_debug_errno(r, "Failed to copy unit file '%s': %m", path); + + if (fchmod(fd, 0644) < 0) + return log_debug_errno(errno, "Failed to change unit file access mode for '%s': %m", path); + + r = link_tmpfile(fd, tmp, path); + if (r < 0) + return log_debug_errno(r, "Failed to install unit file '%s': %m", path); + + tmp = mfree(tmp); + + (void) portable_changes_add(changes, n_changes, PORTABLE_COPY, path, m->source); + } + + /* All is established now, now let's disable any rollbacks */ + chroot_dropin = mfree(chroot_dropin); + profile_dropin = mfree(profile_dropin); + dropin_dir = mfree(dropin_dir); + + return 0; +} + +static int image_symlink( + const char *image_path, + PortableFlags flags, + char **ret) { + + const char *fn, *where; + char *joined = NULL; + + assert(image_path); + assert(ret); + + fn = last_path_component(image_path); + + if (flags & PORTABLE_RUNTIME) + where = "/run/portables/"; + else + where = "/etc/portables/"; + + joined = strjoin(where, fn); + if (!joined) + return -ENOMEM; + + *ret = joined; + return 0; +} + +static int install_image_symlink( + const char *image_path, + PortableFlags flags, + PortableChange **changes, + size_t *n_changes) { + + _cleanup_free_ char *sl = NULL; + int r; + + assert(image_path); + + /* If the image is outside of the image search also link it into it, so that it can be found with short image + * names and is listed among the images. */ + + if (image_in_search_path(IMAGE_PORTABLE, image_path)) + return 0; + + r = image_symlink(image_path, flags, &sl); + if (r < 0) + return log_debug_errno(r, "Failed to generate image symlink path: %m"); + + (void) mkdir_parents(sl, 0755); + + if (symlink(image_path, sl) < 0) + return log_debug_errno(errno, "Failed to link %s %s %s: %m", image_path, special_glyph(SPECIAL_GLYPH_ARROW), sl); + + (void) portable_changes_add(changes, n_changes, PORTABLE_SYMLINK, sl, image_path); + return 0; +} + +int portable_attach( + sd_bus *bus, + const char *name_or_path, + char **matches, + const char *profile, + PortableFlags flags, + PortableChange **changes, + size_t *n_changes, + sd_bus_error *error) { + + _cleanup_hashmap_free_ Hashmap *unit_files = NULL; + _cleanup_(lookup_paths_free) LookupPaths paths = {}; + _cleanup_(image_unrefp) Image *image = NULL; + PortableMetadata *item; + Iterator iterator; + int r; + + assert(name_or_path); + + r = image_find_harder(IMAGE_PORTABLE, name_or_path, &image); + if (r < 0) + return r; + + r = portable_extract_by_path(image->path, matches, NULL, &unit_files, error); + if (r < 0) + return r; + + r = lookup_paths_init(&paths, UNIT_FILE_SYSTEM, LOOKUP_PATHS_SPLIT_USR, NULL); + if (r < 0) + return r; + + HASHMAP_FOREACH(item, unit_files, iterator) { + r = unit_file_exists(UNIT_FILE_SYSTEM, &paths, item->name); + if (r < 0) + return sd_bus_error_set_errnof(error, r, "Failed to determine whether unit '%s' exists on the host: %m", item->name); + if (r > 0) + return sd_bus_error_setf(error, BUS_ERROR_UNIT_EXISTS, "Unit file '%s' exists on the host already, refusing.", item->name); + + r = unit_file_is_active(bus, item->name, error); + if (r < 0) + return r; + if (r > 0) + return sd_bus_error_setf(error, BUS_ERROR_UNIT_EXISTS, "Unit file '%s' is active already, refusing.", item->name); + } + + HASHMAP_FOREACH(item, unit_files, iterator) { + r = attach_unit_file(&paths, image->path, image->type, item, profile, flags, changes, n_changes); + if (r < 0) + return r; + } + + /* We don't care too much for the image symlink, it's just a convenience thing, it's not necessary for proper + * operation otherwise. */ + (void) install_image_symlink(image->path, flags, changes, n_changes); + + return 0; +} + +static bool marker_matches_image(const char *marker, const char *name_or_path) { + const char *a; + + assert(marker); + assert(name_or_path); + + a = last_path_component(marker); + + if (image_name_is_valid(name_or_path)) { + const char *e; + + /* We shall match against an image name. In that case let's compare the last component, and optionally + * allow either a suffix of ".raw" or a series of "/". */ + + e = startswith(a, name_or_path); + if (!e) + return false; + + return + e[strspn(e, "/")] == 0 || + streq(e, ".raw"); + } else { + const char *b; + size_t l; + + /* We shall match against a path. Let's ignore any prefix here though, as often there are many ways to + * reach the same file. However, in this mode, let's validate any file suffix. */ + + l = strcspn(a, "/"); + b = last_path_component(name_or_path); + + if (strcspn(b, "/") != l) + return false; + + return memcmp(a, b, l) == 0; + } +} + +static int test_chroot_dropin( + DIR *d, + const char *where, + const char *fname, + const char *name_or_path, + char **ret_marker) { + + _cleanup_free_ char *line = NULL, *marker = NULL; + _cleanup_fclose_ FILE *f = NULL; + _cleanup_close_ int fd = -1; + const char *p, *e, *k; + int r; + + assert(d); + assert(where); + assert(fname); + + /* We recognize unis created from portable images via the drop-in we created for them */ + + p = strjoina(fname, ".d/20-portable.conf"); + fd = openat(dirfd(d), p, O_RDONLY|O_CLOEXEC); + if (fd < 0) { + if (errno == ENOENT) + return 0; + + return log_debug_errno(errno, "Failed to open %s/%s: %m", where, p); + } + + f = fdopen(fd, "r"); + if (!f) + return log_debug_errno(errno, "Failed to convert file handle: %m"); + fd = -1; + + (void) __fsetlocking(f, FSETLOCKING_BYCALLER); + + r = read_line(f, LONG_LINE_MAX, &line); + if (r < 0) + return log_debug_errno(r, "Failed to read from %s/%s: %m", where, p); + + e = startswith(line, PORTABLE_DROPIN_MARKER_BEGIN); + if (!e) + return 0; + + k = endswith(e, PORTABLE_DROPIN_MARKER_END); + if (!k) + return 0; + + marker = strndup(e, k - e); + if (!marker) + return -ENOMEM; + + if (!name_or_path) + r = true; + else + r = marker_matches_image(marker, name_or_path); + + if (ret_marker) + *ret_marker = TAKE_PTR(marker); + + return r; +} + +int portable_detach( + sd_bus *bus, + const char *name_or_path, + PortableFlags flags, + PortableChange **changes, + size_t *n_changes, + sd_bus_error *error) { + + _cleanup_(lookup_paths_free) LookupPaths paths = {}; + _cleanup_set_free_free_ Set *unit_files = NULL, *markers = NULL; + _cleanup_closedir_ DIR *d = NULL; + const char *where, *item; + Iterator iterator; + struct dirent *de; + int ret = 0; + int r; + + assert(name_or_path); + + r = lookup_paths_init(&paths, UNIT_FILE_SYSTEM, LOOKUP_PATHS_SPLIT_USR, NULL); + if (r < 0) + return r; + + where = attached_path(&paths, flags); + + d = opendir(where); + if (!d) { + if (errno == ENOENT) + goto not_found; + + return log_debug_errno(errno, "Failed to open '%s' directory: %m", where); + } + + unit_files = set_new(&string_hash_ops); + if (!unit_files) + return -ENOMEM; + + markers = set_new(&path_hash_ops); + if (!markers) + return -ENOMEM; + + FOREACH_DIRENT(de, d, return log_debug_errno(errno, "Failed to enumerate '%s' directory: %m", where)) { + _cleanup_free_ char *marker = NULL; + UnitFileState state; + + if (!unit_name_is_valid(de->d_name, UNIT_NAME_ANY)) + continue; + + /* Filter out duplicates */ + if (set_get(unit_files, de->d_name)) + continue; + + dirent_ensure_type(d, de); + if (!IN_SET(de->d_type, DT_LNK, DT_REG)) + continue; + + r = test_chroot_dropin(d, where, de->d_name, name_or_path, &marker); + if (r < 0) + return r; + if (r == 0) + continue; + + r = unit_file_lookup_state(UNIT_FILE_SYSTEM, &paths, de->d_name, &state); + if (r < 0) + return log_debug_errno(r, "Failed to determine unit file state of '%s': %m", de->d_name); + if (!IN_SET(state, UNIT_FILE_STATIC, UNIT_FILE_DISABLED, UNIT_FILE_LINKED, UNIT_FILE_RUNTIME)) + return sd_bus_error_setf(error, BUS_ERROR_UNIT_EXISTS, "Unit file '%s' is in state '%s', can't detach.", de->d_name, unit_file_state_to_string(state)); + + r = unit_file_is_active(bus, de->d_name, error); + if (r < 0) + return r; + if (r > 0) + return sd_bus_error_setf(error, BUS_ERROR_UNIT_EXISTS, "Unit file '%s' is active, can't detach.", de->d_name); + + r = set_put_strdup(unit_files, de->d_name); + if (r < 0) + return log_debug_errno(r, "Failed to add unit name '%s' to set: %m", de->d_name); + + if (path_is_absolute(marker) && + !image_in_search_path(IMAGE_PORTABLE, marker)) { + + r = set_ensure_allocated(&markers, &path_hash_ops); + if (r < 0) + return r; + + r = set_put(markers, marker); + if (r >= 0) + marker = NULL; + else if (r != -EEXIST) + return r; + } + } + + if (set_isempty(unit_files)) + goto not_found; + + SET_FOREACH(item, unit_files, iterator) { + _cleanup_free_ char *md = NULL; + const char *suffix; + + if (unlinkat(dirfd(d), item, 0) < 0) { + log_debug_errno(errno, "Can't remove unit file %s/%s: %m", where, item); + + if (errno != ENOENT && ret >= 0) + ret = -errno; + } else + portable_changes_add_with_prefix(changes, n_changes, PORTABLE_UNLINK, where, item, NULL); + + FOREACH_STRING(suffix, ".d/10-profile.conf", ".d/20-portable.conf") { + _cleanup_free_ char *dropin = NULL; + + dropin = strjoin(item, suffix); + if (!dropin) + return -ENOMEM; + + if (unlinkat(dirfd(d), dropin, 0) < 0) { + log_debug_errno(errno, "Can't remove drop-in %s/%s: %m", where, dropin); + + if (errno != ENOENT && ret >= 0) + ret = -errno; + } else + portable_changes_add_with_prefix(changes, n_changes, PORTABLE_UNLINK, where, dropin, NULL); + } + + md = strjoin(item, ".d"); + if (!md) + return -ENOMEM; + + if (unlinkat(dirfd(d), md, AT_REMOVEDIR) < 0) { + log_debug_errno(errno, "Can't remove drop-in directory %s/%s: %m", where, md); + + if (errno != ENOENT && ret >= 0) + ret = -errno; + } else + portable_changes_add_with_prefix(changes, n_changes, PORTABLE_UNLINK, where, md, NULL); + } + + /* Now, also drop any image symlink, for images outside of the sarch path */ + SET_FOREACH(item, markers, iterator) { + _cleanup_free_ char *sl = NULL; + struct stat st; + + r = image_symlink(item, flags, &sl); + if (r < 0) { + log_debug_errno(r, "Failed to determine image symlink for '%s', ignoring: %m", item); + continue; + } + + if (lstat(sl, &st) < 0) { + log_debug_errno(errno, "Failed to stat '%s', ignoring: %m", sl); + continue; + } + + if (!S_ISLNK(st.st_mode)) { + log_debug("Image '%s' is not a symlink, ignoring.", sl); + continue; + } + + if (unlink(sl) < 0) { + log_debug_errno(errno, "Can't remove image symlink '%s': %m", sl); + + if (errno != ENOENT && ret >= 0) + ret = -errno; + } else + portable_changes_add(changes, n_changes, PORTABLE_UNLINK, sl, NULL); + } + + /* Try to remove the unit file directory, if we can */ + if (rmdir(where) >= 0) + portable_changes_add(changes, n_changes, PORTABLE_UNLINK, where, NULL); + + return ret; + +not_found: + log_debug("No unit files associated with '%s' found. Image not attached?", name_or_path); + return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "No unit files associated with '%s' found. Image not attached?", name_or_path); +} + +static int portable_get_state_internal( + sd_bus *bus, + const char *name_or_path, + PortableFlags flags, + PortableState *ret, + sd_bus_error *error) { + + _cleanup_(lookup_paths_free) LookupPaths paths = {}; + bool found_enabled = false, found_running = false; + _cleanup_set_free_free_ Set *unit_files = NULL; + _cleanup_closedir_ DIR *d = NULL; + const char *where; + struct dirent *de; + int r; + + assert(name_or_path); + assert(ret); + + r = lookup_paths_init(&paths, UNIT_FILE_SYSTEM, LOOKUP_PATHS_SPLIT_USR, NULL); + if (r < 0) + return r; + + where = attached_path(&paths, flags); + + d = opendir(where); + if (!d) { + if (errno == ENOENT) { + /* If the 'attached' directory doesn't exist at all, then we know for sure this image isn't attached. */ + *ret = PORTABLE_DETACHED; + return 0; + } + + return log_debug_errno(errno, "Failed to open '%s' directory: %m", where); + } + + unit_files = set_new(&string_hash_ops); + if (!unit_files) + return -ENOMEM; + + FOREACH_DIRENT(de, d, return log_debug_errno(errno, "Failed to enumerate '%s' directory: %m", where)) { + UnitFileState state; + + if (!unit_name_is_valid(de->d_name, UNIT_NAME_ANY)) + continue; + + /* Filter out duplicates */ + if (set_get(unit_files, de->d_name)) + continue; + + dirent_ensure_type(d, de); + if (!IN_SET(de->d_type, DT_LNK, DT_REG)) + continue; + + r = test_chroot_dropin(d, where, de->d_name, name_or_path, NULL); + if (r < 0) + return r; + if (r == 0) + continue; + + r = unit_file_lookup_state(UNIT_FILE_SYSTEM, &paths, de->d_name, &state); + if (r < 0) + return log_debug_errno(r, "Failed to determine unit file state of '%s': %m", de->d_name); + if (!IN_SET(state, UNIT_FILE_STATIC, UNIT_FILE_DISABLED, UNIT_FILE_LINKED, UNIT_FILE_LINKED_RUNTIME)) + found_enabled = true; + + r = unit_file_is_active(bus, de->d_name, error); + if (r < 0) + return r; + if (r > 0) + found_running = true; + + r = set_put_strdup(unit_files, de->d_name); + if (r < 0) + return log_debug_errno(r, "Failed to add unit name '%s' to set: %m", de->d_name); + } + + *ret = found_running ? (!set_isempty(unit_files) && (flags & PORTABLE_RUNTIME) ? PORTABLE_RUNNING_RUNTIME : PORTABLE_RUNNING) : + found_enabled ? (flags & PORTABLE_RUNTIME ? PORTABLE_ENABLED_RUNTIME : PORTABLE_ENABLED) : + !set_isempty(unit_files) ? (flags & PORTABLE_RUNTIME ? PORTABLE_ATTACHED_RUNTIME : PORTABLE_ATTACHED) : PORTABLE_DETACHED; + + return 0; +} + +int portable_get_state( + sd_bus *bus, + const char *name_or_path, + PortableFlags flags, + PortableState *ret, + sd_bus_error *error) { + + PortableState state; + int r; + + assert(name_or_path); + assert(ret); + + /* We look for matching units twice: once in the regular directories, and once in the runtime directories — but + * the latter only if we didn't find anything in the former. */ + + r = portable_get_state_internal(bus, name_or_path, flags & ~PORTABLE_RUNTIME, &state, error); + if (r < 0) + return r; + + if (state == PORTABLE_DETACHED) { + r = portable_get_state_internal(bus, name_or_path, flags | PORTABLE_RUNTIME, &state, error); + if (r < 0) + return r; + } + + *ret = state; + return 0; +} + +int portable_get_profiles(char ***ret) { + assert(ret); + + return conf_files_list_nulstr(ret, NULL, NULL, CONF_FILES_DIRECTORY|CONF_FILES_BASENAME|CONF_FILES_FILTER_MASKED, profile_dirs); +} + +static const char* const portable_change_type_table[_PORTABLE_CHANGE_TYPE_MAX] = { + [PORTABLE_COPY] = "copy", + [PORTABLE_MKDIR] = "mkdir", + [PORTABLE_SYMLINK] = "symlink", + [PORTABLE_UNLINK] = "unlink", + [PORTABLE_WRITE] = "write", +}; + +DEFINE_STRING_TABLE_LOOKUP(portable_change_type, PortableChangeType); + +static const char* const portable_state_table[_PORTABLE_STATE_MAX] = { + [PORTABLE_DETACHED] = "detached", + [PORTABLE_ATTACHED] = "attached", + [PORTABLE_ATTACHED_RUNTIME] = "attached-runtime", + [PORTABLE_ENABLED] = "enabled", + [PORTABLE_ENABLED_RUNTIME] = "enabled-runtime", + [PORTABLE_RUNNING] = "running", + [PORTABLE_RUNNING_RUNTIME] = "running-runtime", +}; + +DEFINE_STRING_TABLE_LOOKUP(portable_state, PortableState); |