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repart: respect SOURCE_DATE_EPOCH on mkdir_p_root

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This let's systemd-repart respect the `SOURCE_DATE_EPOCH` environment
variable when creating directories in the local tree through `CopyFiles`
or `MakeDirectories`.

To do this, we pass a timestamp `ts` to `mkdir_p_root`, which it will
use to fix up `mtime` and `atime` of the directory it creates as
well as the `mtime` of the directory it creates the other directory *in*,
as the `mtime` of the latter is modified when creating a directory in it.

For the same reason, it also needs to fixup the `mtime` of the upper
directory when copying a file into it through `CopyFiles`.

If `SOURCE_DATE_EPOCH`, times are left as is. (`UTIME_OMIT`)
This commit is contained in:
Moritz Sanft
2024-05-07 09:29:58 +02:00
committed by Luca Boccassi
parent 4dc1be99d6
commit 34c3d57474
6 changed files with 98 additions and 24 deletions
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src/basic/mkdir.c
+18 -7
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@@ -204,7 +204,7 @@ int mkdir_p_safe(const char *prefix, const char *path, mode_t mode, uid_t uid, g
return mkdir_p_internal(prefix, path, mode, uid, gid, flags, mkdirat_errno_wrapper);
}
int mkdir_p_root(const char *root, const char *p, uid_t uid, gid_t gid, mode_t m, char **subvolumes) {
int mkdir_p_root_full(const char *root, const char *p, uid_t uid, gid_t gid, mode_t m, usec_t ts, char **subvolumes) {
_cleanup_free_ char *pp = NULL, *bn = NULL;
_cleanup_close_ int dfd = -EBADF;
int r;
@@ -222,7 +222,7 @@ int mkdir_p_root(const char *root, const char *p, uid_t uid, gid_t gid, mode_t m
return r;
else {
/* Extracting the parent dir worked, hence we aren't top-level? Recurse up first. */
r = mkdir_p_root(root, pp, uid, gid, m, subvolumes);
r = mkdir_p_root_full(root, pp, uid, gid, m, ts, subvolumes);
if (r < 0)
return r;
@@ -248,16 +248,27 @@ int mkdir_p_root(const char *root, const char *p, uid_t uid, gid_t gid, mode_t m
return r;
}
if (uid_is_valid(uid) || gid_is_valid(gid)) {
_cleanup_close_ int nfd = -EBADF;
if (ts == USEC_INFINITY && !uid_is_valid(uid) && !gid_is_valid(gid))
return 1;
nfd = openat(dfd, bn, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (nfd < 0)
_cleanup_close_ int nfd = -EBADF;
nfd = openat(dfd, bn, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (nfd < 0)
return -errno;
if (ts != USEC_INFINITY) {
struct timespec tspec;
timespec_store_nsec(&tspec, ts);
if (futimens(dfd, (const struct timespec[2]) { { .tv_nsec = UTIME_OMIT }, tspec }) < 0)
return -errno;
if (fchown(nfd, uid, gid) < 0)
if (futimens(nfd, (const struct timespec[2]) { tspec, tspec }) < 0)
return -errno;
}
if ((uid_is_valid(uid) || gid_is_valid(gid)) && fchown(nfd, uid, gid) < 0)
return -errno;
return 1;
}