[PATCH 2/2] fetch-pack: support --subtree and --commit-subtree options

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

These options are simply turned to upload-pack's "subtree" and "commit-tree" requests, respectively.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin/fetch-pack.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c
index dbd8b7b..0bc7f6d 100644
--- a/builtin/fetch-pack.c
+++ b/builtin/fetch-pack.c
@@ -14,6 +14,8 @@ static int transfer_unpack_limit = -1;
 static int fetch_unpack_limit = -1;
 static int unpack_limit = 100;
 static int prefer_ofs_delta = 1;
+static const char *subtree;
+static int commit_subtree;
 static struct fetch_pack_args args = {
 	/* .uploadpack = */ "git-upload-pack",
 };
@@ -237,6 +239,8 @@ static int find_common(int fd[2], unsigned char *result_sha1,
 	for_each_ref(rev_list_insert_ref, NULL);
 
 	fetching = 0;
+	if (subtree)
+		packet_buf_write(&req_buf, "%s %s\n", commit_subtree ? "commit-subtree" : "subtree", subtree);
 	for ( ; refs ; refs = refs->next) {
 		unsigned char *remote = refs->old_sha1;
 		const char *remote_hex;
@@ -692,6 +696,8 @@ static struct ref *do_fetch_pack(int fd[2],
 
 	if (is_repository_shallow() && !server_supports("shallow"))
 		die("Server does not support shallow clients");
+	if (subtree && !server_supports("subtree"))
+		die("Server does not support subtree");
 	if (server_supports("multi_ack_detailed")) {
 		if (args.verbose)
 			fprintf(stderr, "Server supports multi_ack_detailed\n");
@@ -860,6 +866,15 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 				pack_lockfile_ptr = &pack_lockfile;
 				continue;
 			}
+			if (!prefixcmp(arg, "--subtree=")) {
+				subtree = arg + 10;
+				continue;
+			}
+			if (!prefixcmp(arg, "--commit-subtree=")) {
+				subtree = arg + 17;
+				commit_subtree = 1;
+				continue;
+			}
 			usage(fetch_pack_usage);
 		}
 		dest = (char *)arg;
-- 
1.7.1.rc1.69.g24c2f7