mkdir: allow to create directory whose path contains symlink

Fixes a regression caused by 3008a6f21c1c42efe852d69798a2fdd63fe657ec.

Before the commit, when `mkdir_parents_internal()` is called from `mkdir_p()`,
it uses `_mkdir()` as `flag` is zero. But after the commit, `mkdir_safe_internal()`
is always used. Hence, if the path contains a symlink, it fails with -ENOTDIR.

To fix the issue, this makes `mkdir_p()` calls `mkdir_parents_internal()` with
MKDIR_FOLLOW_SYMLINK flag.

Fixes #22334.

diff --git a/src/basic/mkdir.c b/src/basic/mkdir.c
index 71ed24c589670724a670cfaa8b7d7493c0cfd277..51a0d74e8758876ddb0d62695250c3a49a638a00 100644 (file)
--- a/src/basic/mkdir.c
+++ b/src/basic/mkdir.c
@@ -162,7 +162,7 @@ int mkdir_p_internal(const char *prefix, const char *path, mode_t mode, uid_t ui
 
         assert(_mkdirat != mkdirat);
 
-        r = mkdir_parents_internal(prefix, path, mode, uid, gid, flags, _mkdirat);
+        r = mkdir_parents_internal(prefix, path, mode, uid, gid, flags | MKDIR_FOLLOW_SYMLINK, _mkdirat);
         if (r < 0)
                 return r;