[PATCH v2 07/16] files-backend: remove the use of git_path()

[Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>]

Given $GIT_DIR and $GIT_COMMON_DIR, files-backend is now in charge of
deciding what goes where. The end goal is to pass $GIT_DIR only. A
refs "view" of a linked worktree is a logical ref store that combines
two files backends together.

(*) Not entirely true since strbuf_git_path_submodule() still does path
translation underneath. But that's for another patch.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
 refs/files-backend.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/refs/files-backend.c b/refs/files-backend.c
index 24f5bf7f1..74e31d041 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -924,6 +924,9 @@ struct files_ref_store {
 	 */
 	const char *submodule;
 
+	struct strbuf gitdir;
+	struct strbuf gitcommondir;
+
 	struct ref_entry *loose;
 	struct packed_ref_cache *packed;
 };
@@ -937,6 +940,7 @@ static void files_path(struct files_ref_store *refs, struct strbuf *sb,
 {
 	struct strbuf tmp = STRBUF_INIT;
 	va_list vap;
+	const char *ref;
 
 	va_start(vap, fmt);
 	strbuf_vaddf(&tmp, fmt, vap);
@@ -944,8 +948,12 @@ static void files_path(struct files_ref_store *refs, struct strbuf *sb,
 	if (refs->submodule)
 		strbuf_git_path_submodule(sb, refs->submodule,
 					  "%s", tmp.buf);
+	else if (is_per_worktree_ref(tmp.buf) ||
+		 (skip_prefix(tmp.buf, "logs/", &ref) &&
+		  is_per_worktree_ref(ref)))
+		strbuf_addf(sb, "%s/%s", refs->gitdir.buf, tmp.buf);
 	else
-		strbuf_git_path(sb, "%s", tmp.buf);
+		strbuf_addf(sb, "%s/%s", refs->gitcommondir.buf, tmp.buf);
 	strbuf_release(&tmp);
 }
 
@@ -1004,7 +1012,15 @@ static struct ref_store *files_ref_store_create(const char *submodule)
 
 	base_ref_store_init(ref_store, &refs_be_files);
 
-	refs->submodule = xstrdup_or_null(submodule);
+	strbuf_init(&refs->gitdir, 0);
+	strbuf_init(&refs->gitcommondir, 0);
+
+	if (submodule) {
+		refs->submodule = xstrdup(submodule);
+	} else {
+		strbuf_addstr(&refs->gitdir, get_git_dir());
+		strbuf_addstr(&refs->gitcommondir, get_git_common_dir());
+	}
 
 	return ref_store;
 }
-- 
2.11.0.157.gd943d85