Re: [PATCH v5 04/24] files-backend: convert git_path() to strbuf_git_path()

git_path() and friends are going to be killed in files-backend.c in near
future. And because there's a risk with overwriting buffer in
git_path(), let's convert them all to strbuf_git_path(). We'll have
easier time killing/converting strbuf_git_path() then because we won't
have to worry about memory management again.

Signed-off-by: Nguyễn Thái Ngọc Duy <redacted>
---
 refs/files-backend.c | 139 +++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 106 insertions(+), 33 deletions(-)

diff --git a/refs/files-backend.c b/refs/files-backend.c
index 4676525de..435db1293 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c

[...]

@@ -2586,9 +2603,15 @@ static int files_rename_ref(struct ref_store *ref_store,
 	int flag = 0, logmoved = 0;
 	struct ref_lock *lock;
 	struct stat loginfo;
-	int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
+	struct strbuf sb_oldref = STRBUF_INIT;
+	struct strbuf sb_newref = STRBUF_INIT;
+	struct strbuf tmp_renamed_log = STRBUF_INIT;
+	int log, ret;
 	struct strbuf err = STRBUF_INIT;
 
+	strbuf_git_path(&sb_oldref, "logs/%s", oldrefname);
+	log = !lstat(sb_oldref.buf, &loginfo);
+	strbuf_release(&sb_oldref);
 	if (log && S_ISLNK(loginfo.st_mode))
 		return error("reflog for %s is a symlink", oldrefname);
 

@@ -2602,7 +2625,12 @@ static int files_rename_ref(struct ref_store *ref_store,
 	if (!rename_ref_available(oldrefname, newrefname))
 		return 1;
 
-	if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG)))
+	strbuf_git_path(&sb_oldref, "logs/%s", oldrefname);
+	strbuf_git_path(&tmp_renamed_log, TMP_RENAMED_LOG);
+	ret = log && rename(sb_oldref.buf, tmp_renamed_log.buf);
+	strbuf_release(&sb_oldref);
+	strbuf_release(&tmp_renamed_log);
+	if (ret)
 		return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
 			oldrefname, strerror(errno));
 

@@ -2681,13 +2709,19 @@ static int files_rename_ref(struct ref_store *ref_store,
 	log_all_ref_updates = flag;
 
  rollbacklog:
-	if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname)))
+	strbuf_git_path(&sb_newref, "logs/%s", newrefname);
+	strbuf_git_path(&sb_oldref, "logs/%s", oldrefname);
+	if (logmoved && rename(sb_newref.buf, sb_oldref.buf))
 		error("unable to restore logfile %s from %s: %s",
 			oldrefname, newrefname, strerror(errno));
+	strbuf_git_path(&tmp_renamed_log, TMP_RENAMED_LOG);
 	if (!logmoved && log &&
-	    rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname)))
+	    rename(tmp_renamed_log.buf, sb_oldref.buf))
 		error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
 			oldrefname, strerror(errno));

 	return 1;
 }
[...]

@@ -4108,18 +4171,28 @@ static int files_reflog_expire(struct ref_store *ref_store,
 
 static int files_init_db(struct ref_store *ref_store, struct strbuf *err)
 {
+	struct strbuf sb = STRBUF_INIT;
+
 	/* Check validity (but we don't need the result): */
 	files_downcast(ref_store, 0, "init_db");
 
 	/*
 	 * Create .git/refs/{heads,tags}
 	 */
-	safe_create_dir(git_path("refs/heads"), 1);
-	safe_create_dir(git_path("refs/tags"), 1);
+	strbuf_git_path(&sb, "refs/heads");
+	safe_create_dir(sb.buf, 1);
+	strbuf_reset(&sb);
+	strbuf_git_path(&sb, "refs/tags");
+	safe_create_dir(sb.buf, 1);
+	strbuf_reset(&sb);
 	if (get_shared_repository()) {
-		adjust_shared_perm(git_path("refs/heads"));
-		adjust_shared_perm(git_path("refs/tags"));
+		strbuf_git_path(&sb, "refs/heads");
+		adjust_shared_perm(sb.buf);
+		strbuf_reset(&sb);
+		strbuf_git_path(&sb, "refs/tags");
+		adjust_shared_perm(sb.buf);
 	}
+	strbuf_release(&sb);
 	return 0;
 }