#!/bin/bash

set -e
set -u

export APPSH_HOME=$(cd $(dirname "$0")/.. && pwd)

. $APPSH_HOME/lib/common
# HEADER END

usage_text() {
  echo "usage: $usage_app -v <version>"
}

version=

while getopts "v:" opt
do
  case $opt in
    v)
      version=$OPTARG
      shift 2
      OPTIND=1
      ;;
  esac
done

if [[ -z $version || $# != 0 ]]
then
  usage
fi

if [[ ! -d versions/$version ]]
then
  fatal "Invalid version: not a directory: versions/$version"
fi

if [[ -e current && ! -s current ]]
then
  fatal "'current' is not a symlink"
fi

if [[ -e current ]]
then
  prev=`ls -l current`
  prev=${prev/#* -> versions}
  prev=${prev:1}
  prev=${prev/%?root}
  echo "Changing current symlink from $prev to $version"
  rm current
  ln -s versions/$version/root current
else
  echo "Creating current symlink for version $version"
  ln -s versions/$version/root current
fi

app-conf set app.installed_version "$version"