t = path_make_absolute_cwd(*s);
free(*s);
+ *s = NULL;
if (!t) {
enomem = true;
return path;
}
-bool path_startswith(const char *path, const char *prefix) {
+char* path_startswith(const char *path, const char *prefix) {
assert(path);
assert(prefix);
if ((path[0] == '/') != (prefix[0] == '/'))
- return false;
+ return NULL;
for (;;) {
size_t a, b;
prefix += strspn(prefix, "/");
if (*prefix == 0)
- return true;
+ return (char*) path;
if (*path == 0)
- return false;
+ return NULL;
a = strcspn(path, "/");
b = strcspn(prefix, "/");
if (a != b)
- return false;
+ return NULL;
if (memcmp(path, prefix, a) != 0)
- return false;
+ return NULL;
path += a;
prefix += b;
int r;
struct file_handle *h;
int mount_id, mount_id_parent;
+ struct stat a, b;
/* We are not actually interested in the file handles, but
* name_to_handle_at() also passes us the mount ID, hence use
r = name_to_handle_at(AT_FDCWD, t, h, &mount_id, allow_symlink ? AT_SYMLINK_FOLLOW : 0);
if (r < 0) {
+ if (errno == ENOSYS || errno == ENOTSUP)
+ /* This kernel or file system does not support
+ * name_to_handle_at(), hence fallback to the
+ * traditional stat() logic */
+ goto fallback;
+
if (errno == ENOENT)
return 0;
r = name_to_handle_at(AT_FDCWD, parent, h, &mount_id_parent, 0);
free(parent);
- if (r < 0)
- return -errno;
+ 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 */
+ if (errno == ENOTSUP)
+ return 1;
+ return -errno;
+ }
return mount_id != mount_id_parent;
+
+fallback:
+ if (allow_symlink)
+ r = stat(t, &a);
+ else
+ r = lstat(t, &a);
+
+ if (r < 0) {
+ if (errno == ENOENT)
+ return 0;
+
+ return -errno;
+ }
+
+ r = path_get_parent(t, &parent);
+ if (r < 0)
+ return r;
+
+ r = lstat(parent, &b);
+ free(parent);
+
+ if (r < 0)
+ return -errno;
+
+ return a.st_dev != b.st_dev;
}
int path_is_read_only_fs(const char *path) {