#!/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 "$(git --version)" = 'git version 2.56.0'
mkdir example-work
cd example-work
git init --bare -q --template= --initial-branch=main remote.git
git init -q --template= --initial-branch=main project
cd project
git config commit.gpgsign false
git config core.autocrlf false
git remote add origin ../remote.git
printf 'base\n' > note.txt
git add note.txt
git commit -qm 'Base note'
git push -q -u origin main
git switch -q --detach
printf 'detached work\n' >> note.txt
git add note.txt
git commit -qm 'Detached change'
saved=$(git rev-parse HEAD)
test -z "$(git branch --show-current)"
git switch -q -c keep-detached-work
test "$(git rev-parse keep-detached-work)" = "$saved"
printf 'Detached commit retained by branch keep-detached-work\n'
git switch -q main
test "$(git log -1 --format='%s' keep-detached-work)" = 'Detached change'
printf 'Original branch remains separate\n'