#!/bin/bash


if test -z "${GL_URL}"; then
  echo "No URL defined"
  exit 1
fi

test -d /web/.attic || mkdir /web/.attic

if test -f /web/.attic/SNAPID; then
  read snapid < /web/.attic/SNAPID
  let snapid=snapid+1
  echo ${snapid} > /web/.attic/SNAPID
  mkdir /web/.attic/snap-${snapid}
else
  echo 0 > /web/.attic/SNAPID
  let snapid=0
  mkdir /web/.attic/snap-${snapid}
fi

find /web -maxdepth 1 ! "(" -name ".attic" -o -wholename "/web" ")"   -print0 | xargs -n 1 -0 mv -t /web/.attic/snap-${snapid}

curl "${GL_URL}" | tar -C /web --strip-components 1 -zxvf -