am --rebasing: get patch body from commit, not from mailbox

Rebasing a commit that contains a diff in the commit message results
in a failure with output such as

  First, rewinding head to replay your work on top of it...
  Applying: My cool patch.
  fatal: sha1 information is lacking or useless
  (app/controllers/settings_controller.rb).
  Repository lacks necessary blobs to fall back on 3-way merge.
  Cannot fall back to three-way merge.
  Patch failed at 0001 My cool patch.

The reason is that 'git rebase' without -p/-i/-m internally calls 'git
format-patch' and pipes the output to 'git am --rebasing', which has
no way of knowing what is a real patch and what is a commit message
that contains a patch.

Make 'git am' while in --rebasing mode get the patch body from the
commit object instead of extracting it from the mailbox.

Patch by Junio, test case and commit log message by Martin.

Reported-by: anikey <arty.anikey@gmail.com>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Martin von Zweigbergk <martin.von.zweigbergk@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/git-am.sh b/git-am.sh
index f8b7a0c..ec8fde1 100755
--- a/git-am.sh
+++ b/git-am.sh
@@ -683,6 +683,7 @@ To restore the original branch and stop patching run \"\$cmdline --abort\"."
 			sed -e '1,/^$/d' >"$dotest/msg-clean"
 			echo "$commit" > "$dotest/original-commit"
 			get_author_ident_from_commit "$commit" > "$dotest/author-script"
+			git diff-tree --root --binary "$commit" >"$dotest/patch"
 		else
 			{
 				sed -n '/^Subject/ s/Subject: //p' "$dotest/info"