#!/bin/zsh
#
# This file is part of Canvas.
# Copyright (C) 2019-present  Instructure, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#

set -euxo pipefail

function setLastChanged {
    # Set time on all files from commit
    git fetch origin $1 || git fetch origin master
    git checkout -f $1
    TIMESTAMP=$(date -r $(git log -1 --format="%at") +%Y%m%d%H%M.%S)
    find . -exec touch -t $TIMESTAMP {} +

    # Set all changed files to now
    git checkout -f -
}

# try getting timestamp information from the cache
if [[ -f cache-metadata/cache-commit-hash ]]; then
    setLastChanged $(cat cache-metadata/cache-commit-hash)
else
    # fall back to assuming master was the last thing to produce a cache
    setLastChanged master
fi
