refs.c: avoid repeated git_path calls in rename_tmp_log

Because it's not safe to store the static-buffer results of
git_path for a long time, we end up formatting the same
filename over and over. We can fix this by using a
function-local strbuf to store the formatted pathname and
avoid repeating ourselves.

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 105f271e4847555f13479b31d3244019509ac2fc..086fb1ad0275a19a13c794f53687dade0af481f8 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -2930,9 +2930,13 @@ out:
 static int rename_tmp_log(const char *newrefname)
 {
        int attempts_remaining = 4;
+       struct strbuf path = STRBUF_INIT;
+       int ret = -1;
 
  retry:
-       switch (safe_create_leading_directories_const(git_path("logs/%s", newrefname))) {
+       strbuf_reset(&path);
+       strbuf_git_path(&path, "logs/%s", newrefname);
+       switch (safe_create_leading_directories_const(path.buf)) {
        case SCLD_OK:
                break; /* success */
        case SCLD_VANISHED:
@@ -2941,19 +2945,19 @@ static int rename_tmp_log(const char *newrefname)
                /* fall through */
        default:
                error("unable to create directory for %s", newrefname);
-               return -1;
+               goto out;
        }
 
-       if (rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) {
+       if (rename(git_path(TMP_RENAMED_LOG), path.buf)) {
                if ((errno==EISDIR || errno==ENOTDIR) && --attempts_remaining > 0) {
                        /*
                         * rename(a, b) when b is an existing
                         * directory ought to result in ISDIR, but
                         * Solaris 5.8 gives ENOTDIR.  Sheesh.
                         */
-                       if (remove_empty_directories(git_path("logs/%s", newrefname))) {
+                       if (remove_empty_directories(path.buf)) {
                                error("Directory not empty: logs/%s", newrefname);
-                               return -1;
+                               goto out;
                        }
                        goto retry;
                } else if (errno == ENOENT && --attempts_remaining > 0) {
@@ -2966,10 +2970,13 @@ static int rename_tmp_log(const char *newrefname)
                } else {
                        error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
                                newrefname, strerror(errno));
-                       return -1;
+                       goto out;
                }
        }
-       return 0;
+       ret = 0;
+out:
+       strbuf_release(&path);
+       return ret;
 }
 
 static int rename_ref_available(const char *oldname, const char *newname)