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shared/mkfs-util: split out mkfs_find_or_warn()

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This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2026-05-28 12:06:10 +02:00
parent 90e3b4cb26
commit fa2a6b6d88
1 changed files with 53 additions and 46 deletions
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src/shared/mkfs-util.c
+53 -46
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@@ -39,6 +39,56 @@ int mkfs_exists(const char *fstype) {
return true;
}
static int mkfs_find_or_warn(const char *fstype, bool have_root, char **ret) {
int r;
assert(fstype);
if (fstype_is_ro(fstype) && !have_root)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Cannot generate read-only filesystem %s without a source tree.", fstype);
const char *bin = NULL;
if (streq(fstype, "swap")) {
if (have_root)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"A swap filesystem can't be populated, refusing");
bin = "mkswap";
} else if (streq(fstype, "squashfs"))
bin = "mksquashfs";
else if (streq(fstype, "erofs"))
bin = "mkfs.erofs";
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);
if (bin) {
r = find_executable(bin, ret);
if (r == -ENOENT)
return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), "%s binary not available.", bin);
if (r < 0)
return log_error_errno(r, "Failed to determine whether %s binary exists: %m", bin);
return 0;
}
if (have_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 not available.", fstype);
if (ret) {
char *mkfs = strjoin("mkfs.", fstype);
if (!mkfs)
return log_oom();
*ret = mkfs;
}
return 0;
}
int mkfs_supports_root_option(const char *fstype) {
return fstype_is_ro(fstype) || STR_IN_SET(fstype, "ext2", "ext3", "ext4", "btrfs", "vfat", "xfs");
}
@@ -190,52 +240,9 @@ int make_filesystem(
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();
}
r = mkfs_find_or_warn(fstype, /* have_root= */ !!root, &mkfs);
if (r < 0)
return r;
if (STR_IN_SET(fstype, "ext2", "ext3", "ext4", "xfs", "swap")) {
size_t max_len =