From ff7ba89b1cdcd22d31641951489f317ead1acc9f Mon Sep 17 00:00:00 2001
From: Tim Hockin <thockin@google.com>
Date: Sun, 11 Sep 2022 18:51:35 -0700
Subject: [PATCH] Make verify-mocks.sh use git worktree

---
 hack/verify-mocks.sh | 66 ++++++++++----------------------------------
 1 file changed, 15 insertions(+), 51 deletions(-)

diff --git a/hack/verify-mocks.sh b/hack/verify-mocks.sh
index 15ed64c16e5..07452c7e7db 100755
--- a/hack/verify-mocks.sh
+++ b/hack/verify-mocks.sh
@@ -25,62 +25,26 @@ set -o nounset
 set -o pipefail
 
 KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
-export KUBE_ROOT
 source "${KUBE_ROOT}/hack/lib/init.sh"
 
 # Explicitly opt into go modules, even though we're inside a GOPATH directory
 export GO111MODULE=on
 
-_tmp="${KUBE_ROOT}/_tmp"
-mkdir -p "${_tmp}"
+kube::util::ensure_clean_working_dir
 
-"${KUBE_ROOT}/hack/update-mocks.sh"
+_tmpdir="$(kube::realpath "$(mktemp -d -t "$(basename "$0").XXXXXX")")"
+git worktree add -f -q "${_tmpdir}" HEAD
+kube::util::trap_add "git worktree remove -f ${_tmpdir}" EXIT
+cd "${_tmpdir}"
 
-# If there are untracked generated mock files which needed to be committed
-if git_status=$(git status --porcelain --untracked=normal 2>/dev/null) && [[ -n "${git_status}" ]]; then
-  echo "!!! You may have untracked mock files."
+# Update the mocks in ${_tmpdir}
+hack/update-mocks.sh
+
+# Test for diffs
+diffs=$(git status --porcelain | wc -l)
+if [[ ${diffs} -gt 0 ]]; then
+  echo "Mock files are out of date" >&2
+  git diff
+  echo "Please run 'hack/update-mocks.sh'" >&2
+  exit 1
 fi
-
-# get the changed mock files
-files=$(git diff --name-only)
-
-# copy the changed files to the _tmp directory for later comparison
-mock_files=()
-for file in $files; do
-  if [ "$file" == "hack/verify-mocks.sh" ]; then
-    continue
-  fi
-
-  # create the directory in _tmp
-  mkdir -p "$_tmp/""$(dirname "$file")"
-  cp "$file" "$_tmp/""$file"
-  mock_files+=("$file")
-
-  # reset the current file
-  git checkout "$file"
-done
-
-echo "diffing process started for ${#mock_files[@]} files"
-ret=0
-for file in "${mock_files[@]}"; do
-  diff -Naupr -B \
-    -I '^/\*' \
-    -I 'Copyright The Kubernetes Authors.' \
-    -I 'Licensed under the Apache License, Version 2.0 (the "License");' \
-    -I 'you may not use this file except in compliance with the License.' \
-    -I 'You may obtain a copy of the License at' \
-    -I 'http://www.apache.org/licenses/LICENSE-2.0' \
-    -I 'Unless required by applicable law or agreed to in writing, software' \
-    -I 'distributed under the License is distributed on an "AS IS" BASIS,' \
-    -I 'WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.' \
-    -I 'See the License for the specific language governing permissions and' \
-    -I 'limitations under the License.' \
-    -I '^\*/' \
-    "$file" "$_tmp/""$file" || ret=$?
-
-  if [[ $ret -ne 0 ]]; then
-    echo "Mock files are out of date. Please run hack/update-mocks.sh" >&2
-    exit 1
-  fi
-done
-echo "up to date"