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>

diff --git a/Documentation/pull-fetch-param.txt b/Documentation/pull-fetch-param.txt
index 6f5ca21748594f4f5003d9e85ab71d21e2bb4ca7..18cffc25b809fa3695b0cc60c732d058e8843ed6 100644 (file)
--- a/Documentation/pull-fetch-param.txt
+++ b/Documentation/pull-fetch-param.txt
@@ -75,4 +75,4 @@ ifdef::git-pull[]
 * A parameter <ref> without a colon merges <ref> into the current
   branch,
 endif::git-pull[]
-  while not storing the branch anywhere locally.
+  and updates the remote-tracking branches (if any).

diff --git a/builtin/fetch.c b/builtin/fetch.c
index 287cf4ce8b1a794d08e8e5aff0afede2fc000de9..e41cc0d733793a630933b7dddb0d8f8ee4f595ed 100644 (file)
--- 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;

diff --git a/t/t5510-fetch.sh b/t/t5510-fetch.sh
index 789c22827de7911220df7ea0aca24c0ebe73dbaf..ff43e08755f79f53407abf10869aadc4567d4705 100755 (executable)
--- a/t/t5510-fetch.sh
+++ b/t/t5510-fetch.sh
@@ -377,7 +377,7 @@ test_expect_success 'mark initial state of origin/master' '
        )
 '
 
-test_expect_success 'explicit fetch should not update tracking' '
+test_expect_success 'explicit fetch should update tracking' '
 
        cd "$D" &&
        git branch -f side &&
@@ -387,12 +387,12 @@ test_expect_success 'explicit fetch should not update tracking' '
                o=$(git rev-parse --verify refs/remotes/origin/master) &&
                git fetch origin master &&
                n=$(git rev-parse --verify refs/remotes/origin/master) &&
-               test "$o" = "$n" &&
+               test "$o" != "$n" &&
                test_must_fail git rev-parse --verify refs/remotes/origin/side
        )
 '
 
-test_expect_success 'explicit pull should not update tracking' '
+test_expect_success 'explicit pull should update tracking' '
 
        cd "$D" &&
        git branch -f side &&
@@ -402,7 +402,7 @@ test_expect_success 'explicit pull should not update tracking' '
                o=$(git rev-parse --verify refs/remotes/origin/master) &&
                git pull origin master &&
                n=$(git rev-parse --verify refs/remotes/origin/master) &&
-               test "$o" = "$n" &&
+               test "$o" != "$n" &&
                test_must_fail git rev-parse --verify refs/remotes/origin/side
        )
 '