#!/bin/sh

# Password can't be empty
test -n "${BORG_PASSPHRASE}"
test -n "${DEST}"
test -n "${SSH_ALIAS}"

# Defaults
SSH_PORT="${SSH_PORT:-22}"
SSH_SERVER="${SSH_SERVER:-${SSH_ALIAS}}"
SSH_USER="${SSH_USER:-root}"

umask 077

DATE="$(date +%F)"
ORIG=/srv/data

if ! grep -q "${SSH_ALIAS}" /root/.ssh/config ; then
  echo "Host ${SSH_ALIAS}"        >> /root/.ssh/config
  echo "  Port ${SSH_PORT}"       >> /root/.ssh/config
  echo "  HostName ${SSH_SERVER}" >> /root/.ssh/config
  echo "  User ${SSH_USER}"       >> /root/.ssh/config
fi

touch /root/.ssh/known_hosts

if ! ssh-keygen -F "[${SSH_SERVER}]:${SSH_PORT}"; then
  echo "${SSH_KNOWN_HOSTS}" >> /root/.ssh/known_hosts
fi

ssh -fN ${SSH_ALIAS}

for signal in TERM QUIT HUP EXIT INT KILL; do
  trap "ssh -O exit \"${SSH_ALIAS}\"" ${signal}
done

# It'll fail the second time
borg init --encryption=repokey "${SSH_ALIAS}:${DEST}" 2>&1 | tee /tmp/backup.log
borg create -v --stats "${SSH_ALIAS}:${DEST}::${DATE}" "${ORIG}" 2>&1 | tee -a /tmp/backup.log
borg prune -v --stats --keep-daily ${KEEP} "${SSH_ALIAS}:${DEST}" 2>&1 | tee -a /tmp/backup.log
borg list "${SSH_ALIAS}:${DEST}" 2>&1 | tee -a /tmp/backup.log

if test -n "${ZULIP_KEY}"; then
  cat /tmp/backup.log | zulip-client -u "${ZULIP_URL}" -b "${ZULIP_BOT}" -s "${ZULIP_STREAM}" -t "${ZULIP_TOPIC}"
fi

exit $?