app_installer.sh

#!/bin/bash

log () {
  echo "$(date): $@"
  logger -p local4.info -t "$APP_NAME[installer]" -- "$@"
}

die () {
  local st="$?"
  log "Error: $@"
  exit "$st"
}

HOME="$(getent passwd $(whoami) | cut -d: -f6)"
source "${HOME}/config" || die "Could not find config for $(whoami):${HOME}"

[ -z "$APP_NAME" ] && die "config did not define APP_NAME"
[ -z "$REPO" ] && die "config did not define REPO"
[ -z "$BRANCH" ] && die "config did not define BRANCH"

OUT="$(
  echo "---------$(date)----------"
  exec 2>&1
  set -x

  (
    flock -nx 9 || die "unable to obtain exclusive lock for install.  unexpected, cron should not be setup yet"

    log "Staring install or reinstall"

    APP_HOME="$HOME/app"
    GIT_DIR="$APP_HOME/$APP_NAME"

    [[ -e "/etc/serice/${APP_NAME}/run" ]] && die "cannot app install with a working service for the app.  use updater"

    if [ ! -e "$GIT_DIR" ]; then
      # initial checkout
      log "doing initial clone of $REPO branch $BRANCH"
      git clone $REPO $GIT_DIR || die "failed to git clone"
    fi

    cd $GIT_DIR || die "failed to change into git clone directory"
    log "checking out latest $BRANCH and updating submodules"
    git fetch || die "failed to get fetch"
    git checkout $BRANCH || die "failed to checkout branch $BRANCH"
    git pull || die "failed to update branch"
    git submodule init
    git submodule update
    log "installing npm modules"
    if [[ "$USE_NVM" == "true" ]]; then
      source $HOME/.nvm/nvm.sh
      npm install || die "failed to install npms"
    else
      /usr/bin/npm install || die "failed to install npms"
    fi
    if [ -n "$UPDATE_HOOK" ]; then
      $UPDATE_HOOK || die "update hook failed"
    fi

    log "Finished (re)install"
    exit 0
  ) 9>/var/lock/app_update-$APP_NAME
)"

RET=$?

echo "$OUT" >> /var/log/$APP_NAME/app_installer.log

if [[ $RET != 0 ]]; then
  echo "$OUT"
  exit $RET
fi