mastodon-backup.sh

#!/bin/sh

MASTODON_DIRECTORY='/var/lib/mastodon/live'
BACKUP_DIRECTORY='/var/lib/mastodon/backups'
DATE_FORMAT='%y%m%d%H%M%S'

#COMPRESSOR='bzip2'
#COMPRESSOR='gzip'
#COMPRESSOR='lz4'
COMPRESSOR='lzfse'
#COMPRESSOR='xz'

CHECKSUM='sha1sum'
#CHECKSUM='sha224sum'
#CHECKSUM='sha256sum'
#CHECKSUM='sha384sum'
#CHECKSUM='sha512sum'

#=======================================================================
# Copyright (c) 2017 Mayu Laierlence <minacle@live.com>
#
# 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, 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#=======================================================================

MASTODON_ROOT="$MASTODON_DIRECTORY"

TEMP=$(ls -ld "$MASTODON_ROOT")
MASTODON_OWNER=$(echo "$TEMP" | awk '{print $3}')
MASTODON_GROUP=$(echo "$TEMP" | awk '{print $4}')

_UID=$(id -u)
if [ $_UID -ne 0 ] && [ $(id -un) != $MASTODON_OWNER ]
then
    echo 'You do not have permission.' >&2
    exit 1
fi

BACKUP_ROOT="$BACKUP_DIRECTORY/$(date +"$DATE_FORMAT")"
DATABASE_DUMP_EXTENSION='pg_dump'
ARCHIVE_FILE="$BACKUP_ROOT.tar"

TEMP=$(cat "$MASTODON_ROOT/.env.production")
for KEY in DB_HOST DB_USER DB_NAME DB_PASS DB_PORT
do
    eval $(echo "$TEMP" | awk "/^$KEY=/ {print \$0}")
done
PGPASSWORD="$DB_PASS"

mkdir -p "$BACKUP_ROOT"
pg_dump $DB_NAME -h $DB_HOST -p $DB_PORT -U $DB_USER \
        >"$BACKUP_ROOT/$DB_NAME.$DATABASE_DUMP_EXTENSION"
mkdir -p "$BACKUP_ROOT/public"
cp -R "$MASTODON_ROOT/public/system" "$BACKUP_ROOT/public"
cp "$MASTODON_ROOT/.env.production" "$BACKUP_ROOT"

test $_UID -eq 0 && chown -R $MASTODON_OWNER:$MASTODON_GROUP "$BACKUP_ROOT"

cd "$BACKUP_ROOT"

case "$COMPRESSOR" in
    bzip2)
        tar -c --format pax . | bzip2 >"$ARCHIVE_FILE.bz2"
        ;;
    gzip)
        tar -c --format pax . | gzip >"$ARCHIVE_FILE.gz"
        ;;
    lz4)
        tar -c --format pax . | lz4 >"$ARCHIVE_FILE.lz4"
        ;;
    lzfse)
        tar -c --format pax . | lzfse -encode >"$ARCHIVE_FILE.lzfse"
        ;;
    xz)
        tar -c --format pax . | xz >"$ARCHIVE_FILE.xz"
        ;;
    '')
        tar -cf "$ARCHIVE_FILE" --format pax .
        ;;
    *)
        tar -c --format pax . | "$COMPRESSOR" \
            >"$ARCHIVE_FILE.$(echo "$COMPRESSOR" | awk '{print $1}')"
        ;;
esac

ARCHIVE_FILE="$(find .. -name "$(basename "$ARCHIVE_FILE")*")"

case "$CHECKSUM" in
    sha1sum)
        shasum -a 1 "$ARCHIVE_FILE" >"$ARCHIVE_FILE.sha1"
        ;;
    sha224sum)
        shasum -a 224 "$ARCHIVE_FILE" >"$ARCHIVE_FILE.sha224"
        ;;
    sha256sum)
        shasum -a 256 "$ARCHIVE_FILE" >"$ARCHIVE_FILE.sha256"
        ;;
    sha384sum)
        shasum -a 384 "$ARCHIVE_FILE" >"$ARCHIVE_FILE.sha384"
        ;;
    sha512sum)
        shasum -a 512 "$ARCHIVE_FILE" >"$ARCHIVE_FILE.sha512"
        ;;
    '')
        ;;
    *)
        "$CHECKSUM" "$ARCHIVE_FILE"* \
            >"$ARCHIVE_FILE.$(echo "$CHECKSUM" | awk '{print $1}')"
        ;;
esac

rm -r "$BACKUP_ROOT"

test $_UID -eq 0 && chown $MASTODON_OWNER:$MASTODON_GROUP "$ARCHIVE_FILE"*