backup-script/backup_script.sh

#!/usr/bin/env bash

### CONFIG
HC_HOST=https://health.jfreudenberger.de
###

PING_ROUTE=$HC_HOST/ping/$HC_UUID
HAS_HOOKS=""

checkInput() {
  for variable in HOOKS BACKUP_PATH HC_UUID RESTIC_REPOSITORY RESTIC_PASSWORD; do
    if [[ -z ${!variable} ]]; then
      echo "Variable $variable not given"
      exit 1
    fi
  done
}

goIntoScriptDirectory() {
  cd $(dirname "${BASH_SOURCE[0]}")
}

checkForHooks() {
  test -f "$HOOKS.sh" && HAS_HOOKS=1
}

loadServiceHooks() {
  if [ "$HAS_HOOKS" == "1" ]; then
    echo "Loading hooks $HOOKS"
    source "$HOOKS.sh"
  fi
}

# Send a curl to start the backup
healthStart() {
  curl -fsS -m 10 --retry 5 -o /dev/null "$PING_ROUTE"/start
}

# Send a curl to finish the backup
healthFinish() {
  curl -fsS -m 10 --retry 5 -o /dev/null "$PING_ROUTE"
}

# Check for General Error
checkNoError() {
  if [ "$1" -ne 0 ]; then
      curl -fsS -m 10 --retry 5 --data-raw "$2 error" "$PING_ROUTE"/fail
      printf "\n%s ERROR !!!\n" "$3"
  else
      printf "\n%s SUCESSFULL\n" "$3"
  fi
}

# Check for Error in Restic backup
checkResticError() {
  if [ "$1" -eq 1 ]; then
      exitPrematurely "restic fatal error" 
  elif [ "$1" -eq 2 ]; then
      exitPrematurely "restic remaining files" 
  else
      printf "\nRESTIC SUCCESSFULL\n"
  fi
}

exitPrematurely() {
  if [ "$HAS_HOOKS" == "1" ]; then
    post
  fi
  
  curl -fsS -m 10 --retry 5 --data-raw "$1" "$PING_ROUTE"/fail
  printf "\n$1 ERROR !!!\n"
  exit -1
}

# Backup the service and call healthchecks
backup() {
  checkInput
  goIntoScriptDirectory
  healthStart
  checkForHooks

  if [ "$HAS_HOOKS" == "1" ]; then
    loadServiceHooks
    pre
  fi

  restic backup $BACKUP_PATH
  checkResticError "$?"

  if [ "$HAS_HOOKS" == "1" ]; then
    post
  fi

  healthFinish
}

backup