merge: indicate remote tracking branches in merge message

Previously when merging directly from a local tracking
branch like:

  git merge origin/master

The merge message said:

   Merge commit 'origin/master'

     * commit 'origin/master':
       ...

Instead, let's be more explicit about what we are merging:

   Merge remote branch 'origin/master'

     * origin/master:
       ...

We accomplish this by recognizing remote tracking branches
in git-merge when we build the simulated FETCH_HEAD output
that we feed to fmt-merge-msg.

In addition to a new test in t7608, we have to tweak the
expected output of t3409, which does such a merge.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/t/t3409-rebase-preserve-merges.sh b/t/t3409-rebase-preserve-merges.sh
index e6c832780f..297d165476 100755
--- a/t/t3409-rebase-preserve-merges.sh
+++ b/t/t3409-rebase-preserve-merges.sh
@@ -71,7 +71,7 @@ test_expect_success 'rebase -p fakes interactive rebase' '
 	git fetch &&
 	git rebase -p origin/topic &&
 	test 1 = $(git rev-list --all --pretty=oneline | grep "Modify A" | wc -l) &&
-	test 1 = $(git rev-list --all --pretty=oneline | grep "Merge commit" | wc -l)
+	test 1 = $(git rev-list --all --pretty=oneline | grep "Merge remote branch " | wc -l)
 	)
 '