refs.c: remove_empty_directories can take a strbuf

The first thing we do in this function is copy the input
into a strbuf. Of the 4 callers, 3 of them already have a
strbuf we could use. Let's just take the strbuf, and convert
the remaining caller to use a strbuf, rather than a raw
git_path. This is safer, anyway, as remove_dir_recursively
is a non-trivial function that might use the pathname
buffers itself (this is _probably_ OK, as the likely culprit
would be calling resolve_gitlink_ref, but we do not pass the
proper flags to ask it to avoid blowing away gitlinks).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/refs.c b/refs.c
index 4ed9f6b04899c0607c9e688ceb78daff3e24690b..84b1aff8421de069c0e89e5a145642c8efe5d412 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -2290,25 +2290,14 @@ static int verify_lock(struct ref_lock *lock,
        return 0;
 }
 
-static int remove_empty_directories(const char *file)
+static int remove_empty_directories(struct strbuf *path)
 {
-       /* we want to create a file but there is a directory there;
+       /*
+        * we want to create a file but there is a directory there;
         * if that is an empty directory (or a directory that contains
         * only empty directories), remove them.
         */
-       struct strbuf path;
-       int result, save_errno;
-
-       strbuf_init(&path, 20);
-       strbuf_addstr(&path, file);
-
-       result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
-       save_errno = errno;
-
-       strbuf_release(&path);
-       errno = save_errno;
-
-       return result;
+       return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY);
 }
 
 /*
@@ -2440,7 +2429,7 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
                 * to remain.
                 */
                strbuf_git_path(&orig_ref_file, "%s", orig_refname);
-               if (remove_empty_directories(orig_ref_file.buf)) {
+               if (remove_empty_directories(&orig_ref_file)) {
                        last_errno = errno;
                        if (!verify_refname_available(orig_refname, extras, skip,
                                                      get_loose_refs(&ref_cache), err))
@@ -2961,7 +2950,7 @@ static int rename_tmp_log(const char *newrefname)
                         * directory ought to result in ISDIR, but
                         * Solaris 5.8 gives ENOTDIR.  Sheesh.
                         */
-                       if (remove_empty_directories(path.buf)) {
+                       if (remove_empty_directories(&path)) {
                                error("Directory not empty: logs/%s", newrefname);
                                goto out;
                        }
@@ -3046,7 +3035,14 @@ int rename_ref(const char *oldrefname, const char *newrefname, const char *logms
        if (!read_ref_full(newrefname, RESOLVE_REF_READING, sha1, NULL) &&
            delete_ref(newrefname, sha1, REF_NODEREF)) {
                if (errno==EISDIR) {
-                       if (remove_empty_directories(git_path("%s", newrefname))) {
+                       struct strbuf path = STRBUF_INIT;
+                       int result;
+
+                       strbuf_git_path(&path, "%s", newrefname);
+                       result = remove_empty_directories(&path);
+                       strbuf_release(&path);
+
+                       if (result) {
                                error("Directory not empty: %s", newrefname);
                                goto rollback;
                        }
@@ -3183,7 +3179,7 @@ static int log_ref_setup(const char *refname, struct strbuf *logfile, struct str
                        return 0;
 
                if (errno == EISDIR) {
-                       if (remove_empty_directories(logfile->buf)) {
+                       if (remove_empty_directories(logfile)) {
                                strbuf_addf(err, "There are still logs under "
                                            "'%s'", logfile->buf);
                                return -1;