Script to back up a Mastodon instance (for non-dockerized installs)

mastodon_backup.sh

#!/usr/bin/env bash
#
# Make a backup file of a Mastodon instance. The backup file is a TGZ containing
# the Postgres dump as well as the /public/system (media) files and the
# .env.production file. For loading the dump file contents, see:
# https://github.com/tootsuite/documentation/blob/master/Running-Mastodon/Migration-guide.md
#
# Usage: ./mastodon_backup.sh my_dump_file.tgz
#
# Advanced usage: MASTODON_LIVE_DIRECTORY=/path/to/live ./mastodon_backup.sh my_dump_file.tgz
#

set -e

if [ -z "$MASTODON_LIVE_DIRECTORY" ]; then
  MASTODON_LIVE_DIRECTORY=$HOME/live
  echo "Using $MASTODON_LIVE_DIRECTORY as the live directory. Set MASTODON_LIVE_DIRECTORY=/path/to/live to change"
else
  echo "Using $MASTODON_LIVE_DIRECTORY as the live directory"
fi

POSTGRES_DUMPFILE="postgres-$(date --rfc-3339=s | tr ' ' '_').sql"
OUTPUT_FILENAME="$1"

if [ -z "$OUTPUT_FILENAME" ]; then
  OUTPUT_FILENAME=mastodon_dump.tgz
fi

cd "$MASTODON_LIVE_DIRECTORY"

source .env.production

DB_URL=postgresql://"$DB_USER":"$DB_PASS"@"$DB_HOST":"$DB_PORT"/"$DB_NAME"

pg_dump --dbname="$DB_URL" > "$POSTGRES_DUMPFILE"

TMP_DUMPFILE=/tmp/masto-backup-tgz-"$RANDOM".tgz

tar -czf "$TMP_DUMPFILE" "$POSTGRES_DUMPFILE" .env.production ./public/system

rm -f "$POSTGRES_DUMPFILE"

cd - > /dev/null

mv "$TMP_DUMPFILE" "$OUTPUT_FILENAME"

echo "Created dump file at $OUTPUT_FILENAME"