rebase: invoke post-rewrite hook

We have to deal with two separate code paths: a normal rebase, which
actually goes through git-am; and rebase {-m|-s}.

The only small issue with both is that they need to remember the
original sha1 across a possible conflict resolution.  rebase -m
already puts this information in $dotest/current, and we just
introduce a similar file for git-am.

Note that in git-am, the hook really only runs when coming from
git-rebase: the code path that sets the $dotest/original-commit file
is guarded by a test for $dotest/rebasing.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-am.sh

@@ -573,13 +573,15 @@ do
 			echo "Patch is empty.  Was it split wrong?"
 			stop_here $this
 		}
+		rm -f "$dotest/original-commit"
 		if test -f "$dotest/rebasing" &&
 			commit=$(sed -e 's/^From \([0-9a-f]*\) .*/\1/' \
 				-e q "$dotest/$msgnum") &&
 			test "$(git cat-file -t "$commit")" = commit
 		then
 			git cat-file commit "$commit" |
 			sed -e '1,/^$/d' >"$dotest/msg-clean"
+			echo "$commit" > "$dotest/original-commit"
 		else
 			{
 				sed -n '/^Subject/ s/Subject: //p' "$dotest/info"
@@ -766,6 +768,10 @@ do
 	git update-ref -m "$GIT_REFLOG_ACTION: $FIRSTLINE" HEAD $commit $parent ||
 	stop_here $this
 
+	if test -f "$dotest/original-commit"; then
+		echo "$(cat "$dotest/original-commit") $commit" >> "$dotest/rewritten"
+	fi
+
 	if test -x "$GIT_DIR"/hooks/post-applypatch
 	then
 		"$GIT_DIR"/hooks/post-applypatch
@@ -774,6 +780,10 @@ do
 	go_next
 done
 
+if test -s "$dotest"/rewritten && test -x "$GIT_DIR"/hooks/post-rewrite; then
+	"$GIT_DIR"/hooks/post-rewrite rebase < "$dotest"/rewritten
+fi
+
 git gc --auto
 
 rm -fr "$dotest"

git-rebase.sh

@@ -79,6 +79,7 @@ continue_merge () {
 		then
 			printf "Committed: %0${prec}d " $msgnum
 		fi
+		echo "$cmt $(git rev-parse HEAD^0)" >> "$dotest/rewritten"
 	else
 		if test -z "$GIT_QUIET"
 		then
@@ -153,6 +154,10 @@ move_to_original_branch () {
 
 finish_rb_merge () {
 	move_to_original_branch
+	if test -x "$GIT_DIR"/hooks/post-rewrite &&
+		test -s "$dotest"/rewritten; then
+		"$GIT_DIR"/hooks/post-rewrite rebase < "$dotest"/rewritten
+	fi
 	rm -r "$dotest"
 	say All done.
 }

t/t5407-post-rewrite-hook.sh

@@ -49,4 +49,34 @@ test_expect_success 'git commit --amend --no-post-rewrite' '
 	test ! -f post-rewrite.data
 '
 
+test_expect_success 'git rebase' '
+	git reset --hard D &&
+	clear_hook_input &&
+	test_must_fail git rebase --onto A B &&
+	echo C > foo &&
+	git add foo &&
+	git rebase --continue &&
+	echo rebase >expected.args &&
+	cat >expected.data <<EOF &&
+$(git rev-parse C) $(git rev-parse HEAD^)
+$(git rev-parse D) $(git rev-parse HEAD)
+EOF
+	verify_hook_input
+'
+
+test_expect_success 'git rebase --skip' '
+	git reset --hard D &&
+	clear_hook_input &&
+	test_must_fail git rebase --onto A B &&
+	test_must_fail git rebase --skip &&
+	echo D > foo &&
+	git add foo &&
+	git rebase --continue &&
+	echo rebase >expected.args &&
+	cat >expected.data <<EOF &&
+$(git rev-parse D) $(git rev-parse HEAD)
+EOF
+	verify_hook_input
+'
+
 test_done