[PATCH v2 18/21] refs: allow ref backend to be set for clone

[David Turner <dturner@twopensource.com>]

Add a new option, --ref-storage, to allow the ref backend type to
be set on new clones.

Submodules must use the same ref backend as the parent repository, so
we also pass the --ref-storage option option when cloning
submodules.

Signed-off-by: David Turner <dturner@twopensource.com>
---
 Documentation/git-clone.txt |  4 ++++
 builtin/clone.c             |  5 +++++
 builtin/submodule--helper.c |  2 +-
 git-submodule.sh            | 13 +++++++++++++
 4 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt
index 6bf000d..dde2a77 100644
--- a/Documentation/git-clone.txt
+++ b/Documentation/git-clone.txt
@@ -14,6 +14,7 @@ SYNOPSIS
 	  [-o <name>] [-b <name>] [-u <upload-pack>] [--reference <repository>]
 	  [--dissociate] [--separate-git-dir <git dir>]
 	  [--depth <depth>] [--[no-]single-branch]
+	  [--ref-storage=<name>]
 	  [--recursive | --recurse-submodules] [--] <repository>
 	  [<directory>]
 
@@ -221,6 +222,9 @@ objects from the source repository into a pack in the cloned repository.
 	The result is Git repository can be separated from working
 	tree.
 
+--ref-storage=<name>::
+	Type of ref storage backend. Default is to use the original files
+	based ref storage.
 
 <repository>::
 	The (possibly remote) repository to clone from.  See the
diff --git a/builtin/clone.c b/builtin/clone.c
index 53c2834..377e59a 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -92,6 +92,8 @@ static struct option builtin_clone_options[] = {
 		   N_("separate git dir from working tree")),
 	OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 			N_("set config inside the new repository")),
+	OPT_STRING(0, "ref-storage", &ref_storage_backend,
+		   N_("name"), N_("name of backend type to use")),
 	OPT_END()
 };
 
@@ -726,6 +728,9 @@ static int checkout(void)
 		cmd.git_cmd = 1;
 		argv_array_pushl(&cmd.args, "submodule", "update",
 				 "--init", "--recursive", NULL);
+		argv_array_pushl(&cmd.args, "--ref-storage",
+				 ref_storage_backend, NULL);
+
 		err = run_command(&cmd);
 	}
 
diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index f4c3eff..a411332 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -140,7 +140,7 @@ static int clone_submodule(const char *path, const char *gitdir, const char *url
 		argv_array_pushl(&cp.args, "--reference", reference, NULL);
 	if (gitdir && *gitdir)
 		argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
-
+	argv_array_pushl(&cp.args, "--ref-storage", ref_storage_backend, NULL);
 	argv_array_push(&cp.args, url);
 	argv_array_push(&cp.args, path);
 
diff --git a/git-submodule.sh b/git-submodule.sh
index 9bc5c5f..d8a9192 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -637,6 +637,14 @@ cmd_update()
 		--checkout)
 			update="checkout"
 			;;
+		--ref-storage=*)
+			ref_storage="$1"
+			;;
+		--ref-storage)
+			case "$2" in '') usage ;; esac
+			ref_storage="$2"
+			shift
+			;;
 		--depth)
 			case "$2" in '') usage ;; esac
 			depth="--depth=$2"
@@ -662,6 +670,11 @@ cmd_update()
 	if test -n "$init"
 	then
 		cmd_init "--" "$@" || return
+	else
+		if test -n "$ref_storage"
+		then
+			usage
+		fi
 	fi
 
 	cloned_modules=
-- 
2.4.2.749.g730654d-twtrsrc