along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
-#include <signal.h>
#include <stdio.h>
#include <fcntl.h>
-#include <dirent.h>
#include <sys/statvfs.h>
#include "macro.h"
} else {
/* canonicalized path goes outside of
* prefix, keep the original path instead */
+ free(u);
u = orig;
orig = NULL;
}
}
}
+bool path_equal_or_files_same(const char *a, const char *b) {
+ return path_equal(a, b) || files_same(a, b) > 0;
+}
+
char* path_join(const char *root, const char *path, const char *rest) {
assert(path);
int path_is_mount_point(const char *t, bool allow_symlink) {
- union file_handle_union h = {
- .handle.handle_bytes = MAX_HANDLE_SZ
- };
-
- int mount_id, mount_id_parent;
- _cleanup_free_ char *parent = NULL;
+ union file_handle_union h = FILE_HANDLE_INIT;
+ int mount_id = -1, mount_id_parent = -1;
struct stat a, b;
int r;
+ _cleanup_close_ int fd = -1;
+ bool nosupp = false;
/* We are not actually interested in the file handles, but
* name_to_handle_at() also passes us the mount ID, hence use
if (path_equal(t, "/"))
return 1;
- r = name_to_handle_at(AT_FDCWD, t, &h.handle, &mount_id, allow_symlink ? AT_SYMLINK_FOLLOW : 0);
+ fd = openat(AT_FDCWD, t, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|(allow_symlink ? 0 : O_PATH));
+ if (fd < 0) {
+ if (errno == ENOENT)
+ return 0;
+
+ return -errno;
+ }
+
+ r = name_to_handle_at(fd, "", &h.handle, &mount_id, AT_EMPTY_PATH);
if (r < 0) {
- if (IN_SET(errno, ENOSYS, EOPNOTSUPP))
+ if (errno == ENOSYS)
+ /* This kernel does not support name_to_handle_at()
+ * fall back to the traditional stat() logic. */
+ goto fallback;
+ else if (errno == EOPNOTSUPP)
/* This kernel or file system does not support
* name_to_handle_at(), hence fallback to the
* traditional stat() logic */
- goto fallback;
-
- if (errno == ENOENT)
+ nosupp = true;
+ else if (errno == ENOENT)
return 0;
-
- return -errno;
+ else
+ return -errno;
}
- r = path_get_parent(t, &parent);
- if (r < 0)
- return r;
h.handle.handle_bytes = MAX_HANDLE_SZ;
- r = name_to_handle_at(AT_FDCWD, parent, &h.handle, &mount_id_parent, 0);
- if (r < 0) {
- /* The parent can't do name_to_handle_at() but the
- * directory we are interested in can? If so, it must
- * be a mount point */
+ r = name_to_handle_at(fd, "..", &h.handle, &mount_id_parent, 0);
+ if (r < 0)
if (errno == EOPNOTSUPP)
- return 1;
-
- return -errno;
- }
-
- return mount_id != mount_id_parent;
+ if (nosupp)
+ /* Neither parent nor child do name_to_handle_at()?
+ We have no choice but to fall back. */
+ goto fallback;
+ else
+ /* The parent can't do name_to_handle_at() but
+ * the directory we are interested in can?
+ * Or the other way around?
+ * If so, it must be a mount point. */
+ return 1;
+ else
+ return -errno;
+ else
+ return mount_id != mount_id_parent;
fallback:
- if (allow_symlink)
- r = stat(t, &a);
- else
- r = lstat(t, &a);
+ r = fstatat(fd, "", &a, AT_EMPTY_PATH);
if (r < 0) {
if (errno == ENOENT)
return -errno;
}
- r = path_get_parent(t, &parent);
- if (r < 0)
- return r;
- r = lstat(parent, &b);
+ r = fstatat(fd, "..", &b, 0);
if (r < 0)
return -errno;
int r;
/* We use /usr/lib/os-release as flag file if something is an OS */
- p = strappenda(path, "/usr/lib/os-release");
+ p = strjoina(path, "/usr/lib/os-release");
r = access(p, F_OK);
if (r >= 0)
return 1;
/* Also check for the old location in /etc, just in case. */
- p = strappenda(path, "/etc/os-release");
+ p = strjoina(path, "/etc/os-release");
r = access(p, F_OK);
return r >= 0;
const char *checker;
int r;
- checker = strappenda("fsck.", fstype);
+ checker = strjoina("fsck.", fstype);
r = find_binary(checker, true, &p);
if (r < 0)