#!/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'
export GIT_AUTHOR_EMAIL='author@example.invalid'
export GIT_COMMITTER_NAME='Example Author'
export GIT_COMMITTER_EMAIL='author@example.invalid'
export GIT_AUTHOR_DATE='2026-10-25T12:00:00Z'
export GIT_COMMITTER_DATE='2026-10-25T12:00:00Z'
test "$(git --version)" = 'git version 2.56.0'
mkdir recovery-example
cd recovery-example
git -c init.templateDir= init -q -b main
printf 'base\n' > note.txt
git add note.txt
git commit -qm 'Base'
git switch -qc topic
printf 'unique topic work\n' > note.txt
git commit -qam 'Unique topic work'
original_tip=$(git rev-parse HEAD)
git switch -q main
# This deletion is only for the newly created fictional repository.
git branch -D topic > deletion.txt
cat deletion.txt
git reflog show HEAD --format='%h %gs'
candidate=$(git rev-parse 'HEAD@{1}')
test "$candidate" = "$original_tip"
test "$candidate" != "$(git rev-parse HEAD)"
git show --format=fuller --stat "$candidate"
test "$(git show "$candidate":note.txt)" = 'unique topic work'
git branch recovered "$candidate"
test "$(git rev-parse recovered)" = "$original_tip"
test "$(git branch --show-current)" = main
printf 'recovery: original tip named; main remains checked out\n'