#!/bin/sh
# SPDX-License-Identifier: MIT
set -eu
export TZ=UTC LC_ALL=C
export GIT_CONFIG_NOSYSTEM=1 GIT_CONFIG_GLOBAL=/dev/null
export GIT_AUTHOR_NAME='Example Author' GIT_AUTHOR_EMAIL='author@example.invalid'
export GIT_COMMITTER_NAME='Example Author' GIT_COMMITTER_EMAIL='author@example.invalid'
export GIT_AUTHOR_DATE='2026-10-27T12:00:00+00:00'
export GIT_COMMITTER_DATE='2026-10-27T12:00:00+00:00'
test "$(git version)" = 'git version 2.56.0'

mkdir rename-example
cd rename-example
git init --template= --bare -q --initial-branch=main origin.git
git init --template= -q --initial-branch=main repo
cd repo
printf 'base\n' > note.txt
git add note.txt
git commit -qm 'Base'
git remote add origin ../origin.git
git push -q -u origin main >/dev/null
git switch -qc old-name
printf 'topic\n' >> note.txt
git commit -qam 'Topic work'
git push -q -u origin old-name >/dev/null
before=$(git rev-parse HEAD)
git branch -m new-name
test "$(git rev-parse HEAD)" = "$before"
test "$(git branch --show-current)" = new-name
test "$(git rev-parse --abbrev-ref --symbolic-full-name '@{upstream}')" = origin/old-name
printf 'Local name changed; upstream still names origin/old-name\n'
git push -q -u origin new-name >/dev/null
git push -q origin --delete old-name
test "$(git rev-parse --abbrev-ref --symbolic-full-name '@{upstream}')" = origin/new-name
git --git-dir=../origin.git show-ref --verify --quiet refs/heads/new-name
test "$(git --git-dir=../origin.git rev-parse refs/heads/new-name)" = "$before"
if git --git-dir=../origin.git show-ref --verify --quiet refs/heads/old-name; then exit 1; fi
printf 'Remote has new-name; old-name was deleted; upstream updated\n'