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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
commit55944e5e40b1be2afc4855d8d2baf4b73d1876b5 (patch)
tree33f869f55a1b149e9b7c2b7e201867ca5dd52992 /src/shared/mkfs-util.c
parentInitial commit. (diff)
downloadsystemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.tar.xz
systemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.zip
Adding upstream version 255.4.upstream/255.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/shared/mkfs-util.c')
-rw-r--r--src/shared/mkfs-util.c684
1 files changed, 684 insertions, 0 deletions
diff --git a/src/shared/mkfs-util.c b/src/shared/mkfs-util.c
new file mode 100644
index 0000000..4e58b6e
--- /dev/null
+++ b/src/shared/mkfs-util.c
@@ -0,0 +1,684 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <sys/mount.h>
+#include <unistd.h>
+
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "id128-util.h"
+#include "mkfs-util.h"
+#include "mount-util.h"
+#include "mountpoint-util.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "recurse-dir.h"
+#include "rm-rf.h"
+#include "stat-util.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "tmpfile-util.h"
+#include "utf8.h"
+
+int mkfs_exists(const char *fstype) {
+ const char *mkfs;
+ int r;
+
+ assert(fstype);
+
+ if (STR_IN_SET(fstype, "auto", "swap")) /* these aren't real file system types, refuse early */
+ return -EINVAL;
+
+ mkfs = strjoina("mkfs.", fstype);
+ if (!filename_is_valid(mkfs)) /* refuse file system types with slashes and similar */
+ return -EINVAL;
+
+ r = find_executable(mkfs, NULL);
+ if (r == -ENOENT)
+ return false;
+ if (r < 0)
+ return r;
+
+ return true;
+}
+
+int mkfs_supports_root_option(const char *fstype) {
+ return fstype_is_ro(fstype) || STR_IN_SET(fstype, "ext2", "ext3", "ext4", "btrfs", "vfat", "xfs");
+}
+
+static int mangle_linux_fs_label(const char *s, size_t max_len, char **ret) {
+ /* Not more than max_len bytes (12 or 16) */
+
+ assert(s);
+ assert(max_len > 0);
+ assert(ret);
+
+ const char *q;
+ char *ans;
+
+ for (q = s; *q;) {
+ int l;
+
+ l = utf8_encoded_valid_unichar(q, SIZE_MAX);
+ if (l < 0)
+ return l;
+
+ if ((size_t) (q - s + l) > max_len)
+ break;
+ q += l;
+ }
+
+ ans = memdup_suffix0(s, q - s);
+ if (!ans)
+ return -ENOMEM;
+
+ *ret = ans;
+ return 0;
+}
+
+static int mangle_fat_label(const char *s, char **ret) {
+ assert(s);
+
+ _cleanup_free_ char *q = NULL;
+ int r;
+
+ r = utf8_to_ascii(s, '_', &q);
+ if (r < 0)
+ return r;
+
+ /* Classic FAT only allows 11 character uppercase labels */
+ strshorten(q, 11);
+ ascii_strupper(q);
+
+ /* mkfs.vfat: Labels with characters *?.,;:/\|+=<>[]" are not allowed.
+ * Let's also replace any control chars. */
+ for (char *p = q; *p; p++)
+ if (strchr("*?.,;:/\\|+=<>[]\"", *p) || char_is_cc(*p))
+ *p = '_';
+
+ *ret = TAKE_PTR(q);
+ return 0;
+}
+
+static int do_mcopy(const char *node, const char *root) {
+ _cleanup_free_ char *mcopy = NULL;
+ _cleanup_strv_free_ char **argv = NULL;
+ _cleanup_close_ int rfd = -EBADF;
+ _cleanup_free_ DirectoryEntries *de = NULL;
+ int r;
+
+ assert(node);
+ assert(root);
+
+ /* Return early if there's nothing to copy. */
+ if (dir_is_empty(root, /*ignore_hidden_or_backup=*/ false))
+ return 0;
+
+ r = find_executable("mcopy", &mcopy);
+ if (r == -ENOENT)
+ return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), "Could not find mcopy binary.");
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine whether mcopy binary exists: %m");
+
+ argv = strv_new(mcopy, "-s", "-p", "-Q", "-m", "-i", node);
+ if (!argv)
+ return log_oom();
+
+ /* mcopy copies the top level directory instead of everything in it so we have to pass all
+ * the subdirectories to mcopy instead to end up with the correct directory structure. */
+
+ rfd = open(root, O_RDONLY|O_DIRECTORY|O_CLOEXEC);
+ if (rfd < 0)
+ return log_error_errno(errno, "Failed to open directory '%s': %m", root);
+
+ r = readdir_all(rfd, RECURSE_DIR_SORT|RECURSE_DIR_ENSURE_TYPE, &de);
+ if (r < 0)
+ return log_error_errno(r, "Failed to read '%s' contents: %m", root);
+
+ for (size_t i = 0; i < de->n_entries; i++) {
+ _cleanup_free_ char *p = NULL;
+
+ p = path_join(root, de->entries[i]->d_name);
+ if (!p)
+ return log_oom();
+
+ if (!IN_SET(de->entries[i]->d_type, DT_REG, DT_DIR)) {
+ log_debug("%s is not a file/directory which are the only file types supported by vfat, ignoring", p);
+ continue;
+ }
+
+ if (strv_consume(&argv, TAKE_PTR(p)) < 0)
+ return log_oom();
+ }
+
+ if (strv_extend(&argv, "::") < 0)
+ return log_oom();
+
+ r = safe_fork("(mcopy)", FORK_RESET_SIGNALS|FORK_RLIMIT_NOFILE_SAFE|FORK_DEATHSIG_SIGTERM|FORK_LOG|FORK_WAIT|FORK_STDOUT_TO_STDERR|FORK_CLOSE_ALL_FDS, NULL);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ /* Avoid failures caused by mismatch in expectations between mkfs.vfat and mcopy by disabling
+ * the stricter mcopy checks using MTOOLS_SKIP_CHECK. */
+ execve(mcopy, argv, STRV_MAKE("MTOOLS_SKIP_CHECK=1", "TZ=UTC", strv_find_prefix(environ, "SOURCE_DATE_EPOCH=")));
+
+ log_error_errno(errno, "Failed to execute mcopy: %m");
+
+ _exit(EXIT_FAILURE);
+ }
+
+ return 0;
+}
+
+typedef struct ProtofileData {
+ FILE *file;
+ bool has_filename_with_spaces;
+ const char *tmpdir;
+} ProtofileData;
+
+static int protofile_print_item(
+ RecurseDirEvent event,
+ const char *path,
+ int dir_fd,
+ int inode_fd,
+ const struct dirent *de,
+ const struct statx *sx,
+ void *userdata) {
+
+ ProtofileData *data = ASSERT_PTR(userdata);
+ _cleanup_free_ char *copy = NULL;
+ int r;
+
+ if (event == RECURSE_DIR_LEAVE) {
+ fputs("$\n", data->file);
+ return 0;
+ }
+
+ if (!IN_SET(event, RECURSE_DIR_ENTER, RECURSE_DIR_ENTRY))
+ return RECURSE_DIR_CONTINUE;
+
+ char type = S_ISDIR(sx->stx_mode) ? 'd' :
+ S_ISREG(sx->stx_mode) ? '-' :
+ S_ISLNK(sx->stx_mode) ? 'l' :
+ S_ISFIFO(sx->stx_mode) ? 'p' :
+ S_ISBLK(sx->stx_mode) ? 'b' :
+ S_ISCHR(sx->stx_mode) ? 'c' : 0;
+ if (type == 0)
+ return RECURSE_DIR_CONTINUE;
+
+ /* The protofile format does not support spaces in filenames as whitespace is used as a token
+ * delimiter. To work around this limitation, mkfs.xfs allows escaping whitespace by using the /
+ * character (which isn't allowed in filenames and as such can be used to escape whitespace). See
+ * https://lore.kernel.org/linux-xfs/20230222090303.h6tujm7y32gjhgal@andromeda/T/#m8066b3e7d62a080ee7434faac4861d944e64493b
+ * for more information.*/
+
+ if (strchr(de->d_name, ' ')) {
+ copy = strdup(de->d_name);
+ if (!copy)
+ return log_oom();
+
+ string_replace_char(copy, ' ', '/');
+ data->has_filename_with_spaces = true;
+ }
+
+ fprintf(data->file, "%s %c%c%c%03o "UID_FMT" "GID_FMT" ",
+ copy ?: de->d_name,
+ type,
+ sx->stx_mode & S_ISUID ? 'u' : '-',
+ sx->stx_mode & S_ISGID ? 'g' : '-',
+ (unsigned) (sx->stx_mode & 0777),
+ sx->stx_uid, sx->stx_gid);
+
+ if (S_ISREG(sx->stx_mode)) {
+ _cleanup_free_ char *p = NULL;
+
+ /* While we can escape whitespace in the filename, we cannot escape whitespace in the source
+ * path, so hack around that by creating a symlink to the path in a temporary directory and
+ * using the symlink as the source path instead. */
+
+ if (strchr(path, ' ')) {
+ r = tempfn_random_child(data->tmpdir, "mkfs-xfs", &p);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate random child name in %s: %m", data->tmpdir);
+
+ if (symlink(path, p) < 0)
+ return log_error_errno(errno, "Failed to symlink %s to %s: %m", p, path);
+ }
+
+ fputs(p ?: path, data->file);
+ } else if (S_ISLNK(sx->stx_mode)) {
+ _cleanup_free_ char *p = NULL;
+
+ r = readlinkat_malloc(dir_fd, de->d_name, &p);
+ if (r < 0)
+ return log_error_errno(r, "Failed to read symlink %s: %m", path);
+
+ /* If we have a symlink to a path with whitespace in it, we're out of luck, as there's no way
+ * to encode that in the mkfs.xfs protofile format. */
+
+ if (strchr(p, ' '))
+ return log_error_errno(r, "Symlinks to paths containing whitespace are not supported by mkfs.xfs: %m");
+
+ fputs(p, data->file);
+ } else if (S_ISBLK(sx->stx_mode) || S_ISCHR(sx->stx_mode))
+ fprintf(data->file, "%" PRIu32 " %" PRIu32, sx->stx_rdev_major, sx->stx_rdev_minor);
+
+ fputc('\n', data->file);
+
+ return RECURSE_DIR_CONTINUE;
+}
+
+static int make_protofile(const char *root, char **ret_path, bool *ret_has_filename_with_spaces, char **ret_tmpdir) {
+ _cleanup_(rm_rf_physical_and_freep) char *tmpdir = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ _cleanup_(unlink_and_freep) char *p = NULL;
+ struct ProtofileData data = {};
+ const char *vt;
+ int r;
+
+ assert(ret_path);
+ assert(ret_has_filename_with_spaces);
+ assert(ret_tmpdir);
+
+ r = var_tmp_dir(&vt);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get persistent temporary directory: %m");
+
+ r = fopen_temporary_child(vt, &f, &p);
+ if (r < 0)
+ return log_error_errno(r, "Failed to open temporary file: %m");
+
+ /* Explicitly use /tmp here because this directory cannot have spaces its path. */
+ r = mkdtemp_malloc("/tmp/systemd-mkfs-XXXXXX", &tmpdir);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create temporary directory: %m");
+
+ data.file = f;
+ data.tmpdir = tmpdir;
+
+ fputs("/\n"
+ "0 0\n"
+ "d--755 0 0\n", f);
+
+ r = recurse_dir_at(AT_FDCWD, root, STATX_TYPE|STATX_MODE|STATX_UID|STATX_GID, UINT_MAX,
+ RECURSE_DIR_SORT, protofile_print_item, &data);
+ if (r < 0)
+ return log_error_errno(r, "Failed to recurse through %s: %m", root);
+
+ fputs("$\n", f);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to flush %s: %m", p);
+
+ *ret_path = TAKE_PTR(p);
+ *ret_has_filename_with_spaces = data.has_filename_with_spaces;
+ *ret_tmpdir = TAKE_PTR(tmpdir);
+
+ return 0;
+}
+
+int make_filesystem(
+ const char *node,
+ const char *fstype,
+ const char *label,
+ const char *root,
+ sd_id128_t uuid,
+ bool discard,
+ bool quiet,
+ uint64_t sector_size,
+ char * const *extra_mkfs_args) {
+
+ _cleanup_free_ char *mkfs = NULL, *mangled_label = NULL;
+ _cleanup_strv_free_ char **argv = NULL, **env = NULL;
+ _cleanup_(rm_rf_physical_and_freep) char *protofile_tmpdir = NULL;
+ _cleanup_(unlink_and_freep) char *protofile = NULL;
+ char vol_id[CONST_MAX(SD_ID128_UUID_STRING_MAX, 8U + 1U)] = {};
+ int stdio_fds[3] = { -EBADF, STDERR_FILENO, STDERR_FILENO};
+ ForkFlags flags = FORK_RESET_SIGNALS|FORK_RLIMIT_NOFILE_SAFE|FORK_DEATHSIG_SIGTERM|FORK_LOG|FORK_WAIT|
+ FORK_CLOSE_ALL_FDS|FORK_REARRANGE_STDIO|FORK_REOPEN_LOG;
+ int r;
+
+ assert(node);
+ assert(fstype);
+ assert(label);
+
+ if (fstype_is_ro(fstype) && !root)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Cannot generate read-only filesystem %s without a source tree.",
+ fstype);
+
+ if (streq(fstype, "swap")) {
+ if (root)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "A swap filesystem can't be populated, refusing");
+ r = find_executable("mkswap", &mkfs);
+ if (r == -ENOENT)
+ return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), "mkswap binary not available.");
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine whether mkswap binary exists: %m");
+ } else if (streq(fstype, "squashfs")) {
+ r = find_executable("mksquashfs", &mkfs);
+ if (r == -ENOENT)
+ return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), "mksquashfs binary not available.");
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine whether mksquashfs binary exists: %m");
+
+ } else if (streq(fstype, "erofs")) {
+ r = find_executable("mkfs.erofs", &mkfs);
+ if (r == -ENOENT)
+ return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), "mkfs.erofs binary not available.");
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine whether mkfs.erofs binary exists: %m");
+
+ } else if (fstype_is_ro(fstype)) {
+ return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+ "Don't know how to create read-only file system '%s', refusing.",
+ fstype);
+ } else {
+ if (root && !mkfs_supports_root_option(fstype))
+ return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+ "Populating with source tree is not supported for %s", fstype);
+ r = mkfs_exists(fstype);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine whether mkfs binary for %s exists: %m", fstype);
+ if (r == 0)
+ return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), "mkfs binary for %s is not available.", fstype);
+
+ mkfs = strjoin("mkfs.", fstype);
+ if (!mkfs)
+ return log_oom();
+ }
+
+ if (STR_IN_SET(fstype, "ext2", "ext3", "ext4", "xfs", "swap")) {
+ size_t max_len =
+ streq(fstype, "xfs") ? 12 :
+ streq(fstype, "swap") ? 15 :
+ 16;
+
+ r = mangle_linux_fs_label(label, max_len, &mangled_label);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine volume label from string \"%s\": %m", label);
+ label = mangled_label;
+
+ } else if (streq(fstype, "vfat")) {
+ r = mangle_fat_label(label, &mangled_label);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine FAT label from string \"%s\": %m", label);
+ label = mangled_label;
+
+ xsprintf(vol_id, "%08" PRIx32,
+ ((uint32_t) uuid.bytes[0] << 24) |
+ ((uint32_t) uuid.bytes[1] << 16) |
+ ((uint32_t) uuid.bytes[2] << 8) |
+ ((uint32_t) uuid.bytes[3])); /* Take first 32 bytes of UUID */
+ }
+
+ if (isempty(vol_id))
+ assert_se(sd_id128_to_uuid_string(uuid, vol_id));
+
+ /* When changing this conditional, also adjust the log statement below. */
+ if (STR_IN_SET(fstype, "ext2", "ext3", "ext4")) {
+ argv = strv_new(mkfs,
+ "-L", label,
+ "-U", vol_id,
+ "-I", "256",
+ "-m", "0",
+ "-E", discard ? "discard,lazy_itable_init=1" : "nodiscard,lazy_itable_init=1",
+ "-b", "4096",
+ "-T", "default",
+ node);
+
+ if (root && strv_extend_strv(&argv, STRV_MAKE("-d", root), false) < 0)
+ return log_oom();
+
+ if (quiet && strv_extend(&argv, "-q") < 0)
+ return log_oom();
+
+ if (sector_size > 0) {
+ if (strv_extend(&env, "MKE2FS_DEVICE_SECTSIZE") < 0)
+ return log_oom();
+
+ if (strv_extendf(&env, "%"PRIu64, sector_size) < 0)
+ return log_oom();
+ }
+
+ } else if (streq(fstype, "btrfs")) {
+ argv = strv_new(mkfs,
+ "-L", label,
+ "-U", vol_id,
+ node);
+ if (!argv)
+ return log_oom();
+
+ if (!discard && strv_extend(&argv, "--nodiscard") < 0)
+ return log_oom();
+
+ if (root && strv_extend_strv(&argv, STRV_MAKE("-r", root), false) < 0)
+ return log_oom();
+
+ if (quiet && strv_extend(&argv, "-q") < 0)
+ return log_oom();
+
+ /* mkfs.btrfs unconditionally warns about several settings changing from v5.15 onwards which
+ * isn't silenced by "-q", so let's redirect stdout to /dev/null as well. */
+ if (quiet)
+ stdio_fds[1] = -EBADF;
+
+ } else if (streq(fstype, "f2fs")) {
+ argv = strv_new(mkfs,
+ "-g", /* "default options" */
+ "-f", /* force override, without this it doesn't seem to want to write to an empty partition */
+ "-l", label,
+ "-U", vol_id,
+ "-t", one_zero(discard),
+ node);
+
+ if (quiet && strv_extend(&argv, "-q") < 0)
+ return log_oom();
+
+ if (sector_size > 0) {
+ if (strv_extend(&argv, "-w") < 0)
+ return log_oom();
+
+ if (strv_extendf(&argv, "%"PRIu64, sector_size) < 0)
+ return log_oom();
+ }
+
+ } else if (streq(fstype, "xfs")) {
+ const char *j;
+
+ j = strjoina("uuid=", vol_id);
+
+ argv = strv_new(mkfs,
+ "-L", label,
+ "-m", j,
+ "-m", "reflink=1",
+ node);
+ if (!argv)
+ return log_oom();
+
+ if (!discard && strv_extend(&argv, "-K") < 0)
+ return log_oom();
+
+ if (root) {
+ bool has_filename_with_spaces = false;
+ _cleanup_free_ char *protofile_with_opt = NULL;
+
+ r = make_protofile(root, &protofile, &has_filename_with_spaces, &protofile_tmpdir);
+ if (r < 0)
+ return r;
+
+ /* Gross hack to make mkfs.xfs interpret slashes as spaces so we can encode filenames
+ * with spaces in the protofile format. */
+ if (has_filename_with_spaces)
+ protofile_with_opt = strjoin("slashes_are_spaces=1,", protofile);
+ else
+ protofile_with_opt = strdup(protofile);
+ if (!protofile_with_opt)
+ return -ENOMEM;
+
+ if (strv_extend_strv(&argv, STRV_MAKE("-p", protofile_with_opt), false) < 0)
+ return log_oom();
+ }
+
+ if (sector_size > 0) {
+ if (strv_extend(&argv, "-s") < 0)
+ return log_oom();
+
+ if (strv_extendf(&argv, "size=%"PRIu64, sector_size) < 0)
+ return log_oom();
+ }
+
+ if (quiet && strv_extend(&argv, "-q") < 0)
+ return log_oom();
+
+ } else if (streq(fstype, "vfat")) {
+
+ argv = strv_new(mkfs,
+ "-i", vol_id,
+ "-n", label,
+ "-F", "32", /* yes, we force FAT32 here */
+ node);
+
+ if (sector_size > 0) {
+ if (strv_extend(&argv, "-S") < 0)
+ return log_oom();
+
+ if (strv_extendf(&argv, "%"PRIu64, sector_size) < 0)
+ return log_oom();
+ }
+
+ /* mkfs.vfat does not have a --quiet option so let's redirect stdout to /dev/null instead. */
+ if (quiet)
+ stdio_fds[1] = -EBADF;
+
+ } else if (streq(fstype, "swap")) {
+ /* TODO: add --quiet once util-linux v2.38 is available everywhere. */
+
+ argv = strv_new(mkfs,
+ "-L", label,
+ "-U", vol_id,
+ node);
+
+ if (quiet)
+ stdio_fds[1] = -EBADF;
+
+ } else if (streq(fstype, "squashfs")) {
+
+ argv = strv_new(mkfs,
+ root, node,
+ "-noappend");
+
+ /* mksquashfs -quiet option is pretty new so let's redirect stdout to /dev/null instead. */
+ if (quiet)
+ stdio_fds[1] = -EBADF;
+
+ } else if (streq(fstype, "erofs")) {
+
+ argv = strv_new(mkfs,
+ "-U", vol_id,
+ node, root);
+
+ if (quiet && strv_extend(&argv, "--quiet") < 0)
+ return log_oom();
+
+ } else
+ /* Generic fallback for all other file systems */
+ argv = strv_new(mkfs, node);
+
+ if (!argv)
+ return log_oom();
+
+ if (extra_mkfs_args && strv_extend_strv(&argv, extra_mkfs_args, false) < 0)
+ return log_oom();
+
+ if (streq(fstype, "btrfs")) {
+ struct stat st;
+
+ if (stat(node, &st) < 0)
+ return log_error_errno(r, "Failed to stat '%s': %m", node);
+
+ if (S_ISBLK(st.st_mode))
+ flags |= FORK_NEW_MOUNTNS;
+ }
+
+ if (DEBUG_LOGGING) {
+ _cleanup_free_ char *j = NULL;
+
+ j = strv_join(argv, " ");
+ log_debug("Executing mkfs command: %s", strna(j));
+ }
+
+ r = safe_fork_full(
+ "(mkfs)",
+ stdio_fds,
+ /*except_fds=*/ NULL,
+ /*n_except_fds=*/ 0,
+ flags,
+ /*ret_pid=*/ NULL);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ /* Child */
+
+ STRV_FOREACH_PAIR(k, v, env)
+ if (setenv(*k, *v, /* replace = */ true) < 0) {
+ log_error_errno(r, "Failed to set %s=%s environment variable: %m", *k, *v);
+ _exit(EXIT_FAILURE);
+ }
+
+ /* mkfs.btrfs refuses to operate on block devices with mounted partitions, even if operating
+ * on unformatted free space, so let's trick it and other mkfs tools into thinking no
+ * partitions are mounted. See https://github.com/kdave/btrfs-progs/issues/640 for more
+ ° information. */
+ if (flags & FORK_NEW_MOUNTNS)
+ (void) mount_nofollow_verbose(LOG_DEBUG, "/dev/null", "/proc/self/mounts", NULL, MS_BIND, NULL);
+
+ execvp(mkfs, argv);
+
+ log_error_errno(errno, "Failed to execute %s: %m", mkfs);
+
+ _exit(EXIT_FAILURE);
+ }
+
+ if (root && streq(fstype, "vfat")) {
+ r = do_mcopy(node, root);
+ if (r < 0)
+ return r;
+ }
+
+ if (STR_IN_SET(fstype, "ext2", "ext3", "ext4", "btrfs", "f2fs", "xfs", "vfat", "swap"))
+ log_info("%s successfully formatted as %s (label \"%s\", uuid %s)",
+ node, fstype, label, vol_id);
+ else if (streq(fstype, "erofs"))
+ log_info("%s successfully formatted as %s (uuid %s, no label)",
+ node, fstype, vol_id);
+ else
+ log_info("%s successfully formatted as %s (no label or uuid specified)",
+ node, fstype);
+
+ return 0;
+}
+
+int mkfs_options_from_env(const char *component, const char *fstype, char ***ret) {
+ _cleanup_strv_free_ char **l = NULL;
+ const char *e;
+ char *n;
+
+ assert(component);
+ assert(fstype);
+ assert(ret);
+
+ n = strjoina("SYSTEMD_", component, "_MKFS_OPTIONS_", fstype);
+ e = getenv(ascii_strupper(n));
+ if (e) {
+ l = strv_split(e, NULL);
+ if (!l)
+ return -ENOMEM;
+ }
+
+ *ret = TAKE_PTR(l);
+ return 0;
+}