#!/bin/sh
# Turn a WORKING TREE into a bare repo the lab server can hand out.
#
# `git clone` of a checkout only ever produces committed refs, so testing a
# change used to mean pushing it first -- which is backwards, and is the reason
# every bug in this repo was found by a human on a real machine instead of by
# a test. Copying the tree and committing it into a throwaway repo means the
# code under test is whatever is on disk right now, staged or not.
#
# usage: snapshot.sh <src-tree> <serve-root> <name>
set -eu
src=$1; root=$2; name=$3
work=$(mktemp -d)
trap 'rm -rf "$work"' EXIT

# --delete is pointless into a fresh mktemp dir, but it documents intent if
# this is ever pointed at a reused path.
tar -C "$src" --exclude=.git -cf - . | tar -C "$work" -xf -

git -C "$work" init -q -b main
git -C "$work" add -A
git -C "$work" \
	-c user.email=lab@example.invalid -c user.name=lab \
	commit -qm "working-tree snapshot of $name"

rm -rf "$root/$name.git"
mkdir -p "$root"
git clone -q --bare "$work" "$root/$name.git"
git -C "$root/$name.git" update-server-info
printf '%s\n' "$root/$name.git"