fetch: opportunistically update tracking refs

When we run a regular "git fetch" without arguments, we
update the tracking refs according to the configured
refspec. However, when we run "git fetch origin master" (or
"git pull origin master"), we do not look at the configured
refspecs at all, and just update FETCH_HEAD.

We miss an opportunity to update "refs/remotes/origin/master"
(or whatever the user has configured). Some users find this
confusing, because they would want to do further comparisons
against the old state of the remote master, like:

  $ git pull origin master
  $ git log HEAD...origin/master

In the currnet code, they are comparing against whatever
commit happened to be in origin/master from the last time
they did a complete "git fetch".  This patch will update a
ref from the RHS of a configured refspec whenever we happen
to be fetching its LHS. That makes the case above work.

The downside is that any users who really care about whether
and when their tracking branches are updated may be
surprised.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/builtin/fetch.c b/builtin/fetch.c
index 287cf4ce8b..e41cc0d733 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -160,6 +160,8 @@ static struct ref *get_ref_map(struct transport *transport,
 	const struct ref *remote_refs = transport_get_remote_refs(transport);
 
 	if (ref_count || tags == TAGS_SET) {
+		struct ref **old_tail;
+
 		for (i = 0; i < ref_count; i++) {
 			get_fetch_map(remote_refs, &refs[i], &tail, 0);
 			if (refs[i].dst && refs[i].dst[0])
@@ -170,6 +172,20 @@ static struct ref *get_ref_map(struct transport *transport,
 			rm->fetch_head_status = FETCH_HEAD_MERGE;
 		if (tags == TAGS_SET)
 			get_fetch_map(remote_refs, tag_refspec, &tail, 0);
+
+		/*
+		 * For any refs that we happen to be fetching via command-line
+		 * arguments, take the opportunity to update their configured
+		 * counterparts. However, we do not want to mention these
+		 * entries in FETCH_HEAD at all, as they would simply be
+		 * duplicates of existing entries.
+		 */
+		old_tail = tail;
+		for (i = 0; i < transport->remote->fetch_refspec_nr; i++)
+			get_fetch_map(ref_map, &transport->remote->fetch[i],
+				      &tail, 0);
+		for (rm = *old_tail; rm; rm = rm->next)
+			rm->fetch_head_status = FETCH_HEAD_IGNORE;
 	} else {
 		/* Use the defaults */
 		struct remote *remote = transport->remote;