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#!/bin/sh
#
# Trove garbage collection script
#
# Copyright (C) 2014 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# This is a rudimentary garbage collector for Trove instances. It wraps the
# `morph gc` command.
#
# Artifacts older than 1 week will be deleted, and artifacts less than 1 day
# old will not be. Age is calculated from mtime, which is set at the time the
# artifact is uploaded to the cache and after that is not updated by any Trove
# components.
#
# Morph's default `cachedir-min-space` value is taken as the amount of space
# to free. Pass --cachedir-min-space to this command to specify your own value.
#
# `morph gc` is designed for running on build machines so it expects there to
# be a tempdir. A harmless side-effect of this script is that you'll get some
# pointless directories created in /tmp/trove-gc-fake-tempdir.
#
# We lower the 'keep all artifacts younger than xx' value to 0, because
# otherwise artifacts that changed very rapidly would be kept around
# needlessly for up to a day. Likewise, the 'remove all artifacts older than
# xx' rule is effectively disabled, to prevent artifacts that are still needed
# but do not have often (such as stage1 and stage2 of the bootstrap) from being
# automatically deleted. Those artifacts will still be first to be removed in a
# low disk space condition, which is an unfortunate consequence of the simple
# heuristic we are using right now.
set -eu
/usr/bin/morph gc --no-default-config \
--cachedir=/home/cache \
--cachedir-artifact-delete-older-than=31557600000 \
--cachedir-artifact-keep-younger-than=0 \
--tempdir=/tmp/trove-gc-fake-tempdir \
--tempdir-min-space=0M \
"$@"
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