[PATCH 2/6] rebase: prepare to write reflog message for checkout

[Ramkumar Ramachandra <artagnon@gmail.com>]

rebase should never write "checkout: " messages to the reflog, since it
is highly confusing to the end user, and breaks
grab_nth_branch_checkout(), as demonstrated by failing tests
in t/checkout-last.  Set a sensible GIT_REFLOG_ACTION: checkout does not
respect GIT_REFLOG_ACTION yet, but this defect will be addressed in a
future patch.

When the defect is addressed, rebase will write the following line to
the reflog when started:

  rebase: checkout master

This is much better than the confusing message it currently writes:

  checkout: moving from master to 1462b67

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
---
 git-rebase.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/git-rebase.sh b/git-rebase.sh
index d0c11a9..6587019 100755
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -568,6 +568,8 @@ test "$type" = interactive && run_specific_rebase
 
 # Detach HEAD and reset the tree
 say "$(gettext "First, rewinding head to replay your work on top of it...")"
+
+GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name"
 git checkout -q "$onto^0" || die "could not detach HEAD"
 git update-ref ORIG_HEAD $orig_head
 
-- 
1.8.3.1.384.g7cec0b4