[RFC PATCH 3/6] filter-branch: invoke post-rewrite hook

@@ -358,6 +358,10 @@ while read commit parents; do
 	@SHELL_PATH@ -c "$filter_commit" "git commit-tree" \
 		$(git write-tree) $parentstr < ../message > ../map/$commit ||
 			die "could not write rewritten commit"
+	new_commit=$(map $commit)
+	if test $commit != $new_commit; then
+		echo $commit $new_commit >> "$workdir"/../rewritten
+	fi
 done <../revs
 
 # If we are filtering for paths, as in the case of a subdirectory

@@ -484,6 +488,12 @@ if [ "$filter_tag_name" ]; then
 fi
 
 cd ../..
+
+if test -x "$GIT_DIR"/hooks/post-rewrite &&
+	test -s "$workdir"/../rewritten; then
+	"$GIT_DIR"/hooks/post-rewrite filter-branch < "$workdir"/../rewritten
+fi
+
 rm -rf "$tempdir"
 
 trap - 0

@@ -49,4 +49,24 @@ test_expect_success 'git commit --amend --no-post-rewrite' '
 	test ! -f post-rewrite.data
 '
 
+test_expect_success 'git filter-branch' '
+	git reset --hard D &&
+	clear_hook_input &&
+	git filter-branch -f --tree-filter "touch newfile" B..HEAD &&
+	echo filter-branch >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 filter-branch (no-op)' '
+	git reset --hard D &&
+	clear_hook_input &&
+	git filter-branch -f B..HEAD &&
+	test ! -f post-rewrite.args &&
+	test ! -f post-rewrite.data
+'
+
 test_done