[PATCH 3/7] connect.c: teach get_remote_heads to parse "shallow" lines

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

No callers pass a non-empty pointer as shallow_points at this
stage. As a result, all clients still refuse to talk to shallow
repository on the other end.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin/fetch-pack.c |  2 +-
 builtin/send-pack.c  |  2 +-
 cache.h              |  1 +
 connect.c            | 12 +++++++++++-
 remote-curl.c        |  2 +-
 transport.c          |  7 ++++---
 6 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c
index aba4465..080e599 100644
--- a/builtin/fetch-pack.c
+++ b/builtin/fetch-pack.c
@@ -144,7 +144,7 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 				   args.verbose ? CONNECT_VERBOSE : 0);
 	}
 
-	get_remote_heads(fd[0], NULL, 0, &ref, 0, NULL);
+	get_remote_heads(fd[0], NULL, 0, &ref, 0, NULL, NULL);
 
 	ref = fetch_pack(&args, fd, conn, ref, dest,
 			 sought, nr_sought, pack_lockfile_ptr);
diff --git a/builtin/send-pack.c b/builtin/send-pack.c
index 152c4ea..f0ad0ce 100644
--- a/builtin/send-pack.c
+++ b/builtin/send-pack.c
@@ -207,7 +207,7 @@ int cmd_send_pack(int argc, const char **argv, const char *prefix)
 
 	memset(&extra_have, 0, sizeof(extra_have));
 
-	get_remote_heads(fd[0], NULL, 0, &remote_refs, REF_NORMAL, &extra_have);
+	get_remote_heads(fd[0], NULL, 0, &remote_refs, REF_NORMAL, &extra_have, NULL);
 
 	transport_verify_remote_names(nr_refspecs, refspecs);
 
diff --git a/cache.h b/cache.h
index dd0fb33..7665e03 100644
--- a/cache.h
+++ b/cache.h
@@ -1091,6 +1091,7 @@ struct extra_have_objects {
 };
 extern struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
 				     struct ref **list, unsigned int flags,
+				     struct extra_have_objects *,
 				     struct extra_have_objects *);
 extern int server_supports(const char *feature);
 extern int parse_feature_request(const char *features, const char *feature);
diff --git a/connect.c b/connect.c
index a0783d4..1cba424 100644
--- a/connect.c
+++ b/connect.c
@@ -64,7 +64,8 @@ static void die_initial_contact(int got_at_least_one_head)
  */
 struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
 			      struct ref **list, unsigned int flags,
-			      struct extra_have_objects *extra_have)
+			      struct extra_have_objects *extra_have,
+			      struct extra_have_objects *shallow_points)
 {
 	int got_at_least_one_head = 0;
 
@@ -89,6 +90,15 @@ struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
 		if (len > 4 && !prefixcmp(buffer, "ERR "))
 			die("remote error: %s", buffer + 4);
 
+		if (len == 48 && !prefixcmp(buffer, "shallow ")) {
+			if (get_sha1_hex(buffer + 8, old_sha1))
+				die("protocol error: expected shallow sha, got '%s'", buffer + 8);
+			if (!shallow_points)
+				die("repository on the other end cannot be shallow");
+			add_extra_have(shallow_points, old_sha1);
+			continue;
+		}
+
 		if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
 			die("protocol error: expected sha/ref, got '%s'", buffer);
 		name = buffer + 41;
diff --git a/remote-curl.c b/remote-curl.c
index 5b3ce9e..c329bd3 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -86,7 +86,7 @@ static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 {
 	struct ref *list = NULL;
 	get_remote_heads(-1, heads->buf, heads->len, &list,
-			 for_push ? REF_NORMAL : 0, NULL);
+			 for_push ? REF_NORMAL : 0, NULL, NULL);
 	return list;
 }
 
diff --git a/transport.c b/transport.c
index e15db98..10a8cb8 100644
--- a/transport.c
+++ b/transport.c
@@ -509,7 +509,7 @@ static struct ref *get_refs_via_connect(struct transport *transport, int for_pus
 
 	connect_setup(transport, for_push, 0);
 	get_remote_heads(data->fd[0], NULL, 0, &refs,
-			 for_push ? REF_NORMAL : 0, &data->extra_have);
+			 for_push ? REF_NORMAL : 0, &data->extra_have, NULL);
 	data->got_remote_heads = 1;
 
 	return refs;
@@ -539,7 +539,8 @@ static int fetch_refs_via_pack(struct transport *transport,
 
 	if (!data->got_remote_heads) {
 		connect_setup(transport, 0, 0);
-		get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0, NULL);
+		get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
+				 NULL, NULL);
 		data->got_remote_heads = 1;
 	}
 
@@ -799,7 +800,7 @@ static int git_transport_push(struct transport *transport, struct ref *remote_re
 		struct ref *tmp_refs;
 		connect_setup(transport, 1, 0);
 
-		get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL, NULL);
+		get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL, NULL, NULL);
 		data->got_remote_heads = 1;
 	}
 
-- 
1.8.2.83.gc99314b