Merge branch 'jk/filter-branch-come-back-to-original'

When used with "-d temporary-directory" option, "git filter-branch"
failed to come back to the original working tree to perform the
final clean-up procedure.

* jk/filter-branch-come-back-to-original:
  filter-branch: return to original dir after filtering

git-filter-branch.sh

@@ -199,6 +199,7 @@ t)
 	test -d "$tempdir" &&
 		die "$tempdir already exists, please remove it"
 esac
+orig_dir=$(pwd)
 mkdir -p "$tempdir/t" &&
 tempdir="$(cd "$tempdir"; pwd)" &&
 cd "$tempdir/t" &&
@@ -206,7 +207,7 @@ workdir="$(pwd)" ||
 die ""
 
 # Remove tempdir on exit
-trap 'cd ../..; rm -rf "$tempdir"' 0
+trap 'cd "$orig_dir"; rm -rf "$tempdir"' 0
 
 ORIG_GIT_DIR="$GIT_DIR"
 ORIG_GIT_WORK_TREE="$GIT_WORK_TREE"
@@ -469,7 +470,7 @@ if [ "$filter_tag_name" ]; then
 	done
 fi
 
-cd ../..
+cd "$orig_dir"
 rm -rf "$tempdir"
 
 trap - 0

t/t7003-filter-branch.sh

@@ -64,6 +64,20 @@ test_expect_success 'correct GIT_DIR while using -d' '
 	grep drepo "$TRASHDIR/backup-refs"
 '
 
+test_expect_success 'tree-filter works with -d' '
+	git init drepo-tree &&
+	(
+		cd drepo-tree &&
+		test_commit one &&
+		git filter-branch -d "$TRASHDIR/dfoo" \
+			--tree-filter "echo changed >one.t" &&
+		echo changed >expect &&
+		git cat-file blob HEAD:one.t >actual &&
+		test_cmp expect actual &&
+		test_cmp one.t actual
+	)
+'
+
 test_expect_success 'Fail if commit filter fails' '
 	test_must_fail git filter-branch -f --commit-filter "exit 1" HEAD
 '