[PATCH v2 33/43] refs.c: add method for initializing refs db

[David Turner <dturner@twopensource.com>]

Alternate refs backends might not need refs/heads and so on, so we make
ref db initialization part of the backend.

Signed-off-by: David Turner <dturner@twopensource.com>
---
 builtin/init-db.c | 14 ++++----------
 refs-be-files.c   | 17 +++++++++++++++++
 refs.c            |  5 +++++
 refs.h            |  4 ++++
 4 files changed, 30 insertions(+), 10 deletions(-)

diff --git a/builtin/init-db.c b/builtin/init-db.c
index f0b095c..504a2dc 100644
--- a/builtin/init-db.c
+++ b/builtin/init-db.c
@@ -177,13 +177,7 @@ static int create_default_files(const char *template_path)
 	char junk[2];
 	int reinit;
 	int filemode;
-
-	/*
-	 * Create .git/refs/{heads,tags}
-	 */
-	safe_create_dir(git_path_buf(&buf, "refs"), 1);
-	safe_create_dir(git_path_buf(&buf, "refs/heads"), 1);
-	safe_create_dir(git_path_buf(&buf, "refs/tags"), 1);
+	struct strbuf err = STRBUF_INIT;
 
 	/* Just look for `init.templatedir` */
 	git_config(git_init_db_config, NULL);
@@ -207,11 +201,11 @@ static int create_default_files(const char *template_path)
 	 */
 	if (shared_repository) {
 		adjust_shared_perm(get_git_dir());
-		adjust_shared_perm(git_path_buf(&buf, "refs"));
-		adjust_shared_perm(git_path_buf(&buf, "refs/heads"));
-		adjust_shared_perm(git_path_buf(&buf, "refs/tags"));
 	}
 
+	if (refs_initdb(&err, shared_repository))
+		die("failed to set up refs db: %s", err.buf);
+
 	/*
 	 * Create the default symlink from ".git/HEAD" to the "master"
 	 * branch, if it does not exist yet.
diff --git a/refs-be-files.c b/refs-be-files.c
index ea91afd..0a76c8e 100644
--- a/refs-be-files.c
+++ b/refs-be-files.c
@@ -3738,10 +3738,27 @@ static int files_reflog_expire(const char *refname, const unsigned char *sha1,
 	return -1;
 }
 
+static int files_initdb(struct strbuf *err, int shared)
+{
+	/*
+	 * Create .git/refs/{heads,tags}
+	 */
+	safe_create_dir(git_path("refs"), 1);
+	safe_create_dir(git_path("refs/heads"), 1);
+	safe_create_dir(git_path("refs/tags"), 1);
+	if (shared) {
+		adjust_shared_perm(git_path("refs"));
+		adjust_shared_perm(git_path("refs/heads"));
+		adjust_shared_perm(git_path("refs/tags"));
+	}
+	return 0;
+}
+
 struct ref_be refs_be_files = {
 	NULL,
 	"files",
 	NULL,
+	files_initdb,
 	files_transaction_begin,
 	files_transaction_update,
 	files_transaction_create,
diff --git a/refs.c b/refs.c
index 530edcf..930c85c 100644
--- a/refs.c
+++ b/refs.c
@@ -995,6 +995,11 @@ enum peel_status peel_object(const unsigned char *name, unsigned char *sha1)
 }
 
 /* backend functions */
+int refs_initdb(struct strbuf *err, int shared)
+{
+	return the_refs_backend->initdb(err, shared);
+}
+
 struct ref_transaction *ref_transaction_begin(struct strbuf *err)
 {
 	return the_refs_backend->transaction_begin(err);
diff --git a/refs.h b/refs.h
index bd46d0f..64dba64 100644
--- a/refs.h
+++ b/refs.h
@@ -68,6 +68,8 @@ extern int ref_exists(const char *refname);
 
 extern int is_branch(const char *refname);
 
+extern int refs_initdb(struct strbuf *err, int shared);
+
 /*
  * If refname is a non-symbolic reference that refers to a tag object,
  * and the tag can be (recursively) dereferenced to a non-tag object,
@@ -587,6 +589,7 @@ extern int reflog_expire(const char *refname, const unsigned char *sha1,
 
 /* refs backends */
 typedef void (*ref_backend_init_fn)(void *data);
+typedef int (*ref_backend_initdb_fn)(struct strbuf *err, int shared);
 typedef struct ref_transaction *(*ref_transaction_begin_fn)(struct strbuf *err);
 typedef int (*ref_transaction_update_fn)(struct ref_transaction *transaction,
 		const char *refname, const unsigned char *new_sha1,
@@ -666,6 +669,7 @@ struct ref_be {
 	struct ref_be *next;
 	const char *name;
 	ref_backend_init_fn init_backend;
+	ref_backend_initdb_fn initdb;
 	ref_transaction_begin_fn transaction_begin;
 	ref_transaction_update_fn transaction_update;
 	ref_transaction_create_fn transaction_create;
-- 
2.4.2.644.g97b850b-twtrsrc