#!/bin/sh
# Backs up a QM deployment made with the Docker target into one private
# archive: the deployment folder (settings and secrets), the CLI's state,
# a Postgres dump, core's data volume, and every agent computer's home.
# Usage: backup.sh [org] [deployment folder] [backup folder]
set -eu
org="${1:-team}"
dir="${2:-$HOME/qm}"
dest="${3:-$HOME/backups/qm}"
keep="${QM_BACKUP_KEEP:-14}"
umask 077
mkdir -p "$dest"
stamp="$(date -u +%Y%m%d-%H%M%S)"
work="$(mktemp -d "$dest/.qm-$stamp.XXXXXX")"
trap 'rm -rf "$work"' EXIT
tool_image="$(docker inspect -f '{{.Config.Image}}' "qm-$org-pg")"

tar -C "$HOME" -czf "$work/deployment.tgz" --exclude=node_modules \
  "$(realpath --relative-to="$HOME" "$dir")" ".config/qm/deployments/$org"
docker exec "qm-$org-pg" pg_dump -U postgres -Fc qm > "$work/qm.dump"
mkdir "$work/volumes"
for vol in "qm-$org-coredata" $(docker volume ls -q --filter name='^qm-home-'); do
  docker run --rm --network none -v "$vol:/v:ro" --entrypoint tar "$tool_image" \
    -C /v -czf - . > "$work/volumes/$vol.tgz"
done
tar -C "$work" -cf "$dest/qm-$org-$stamp.tar" .
ls -1t "$dest"/qm-"$org"-*.tar | tail -n +"$((keep + 1))" | xargs -r rm -f
echo "$dest/qm-$org-$stamp.tar"