#!/bin/bash

# git.sh - Made for Puppi

# All variables are exported

set -a 

# Sources common header for Puppi scripts

. $(dirname $0)/header || exit 10

# Show help

showhelp () {

    echo "This script performs the git operations required by puppi::project::git"

    echo "It integrates and uses variables provided by other core Puppi scripts"

    echo "It has the following options:"

    echo "-a <action> (Optional) What action to perform. Available options: deploy (default), rollback"

    echo "-s <source> (Required) Git source repo to use"

    echo "-d <destination> (Required) Directory where files are deployed"

    echo "-u <user> (Optional) User that performs the deploy operations. Default root"

    echo "-gs <git_subdir> (Optional) If only a specific subdir of the gitrepo has to be copied to the install destination"

    echo "-t <tag> (Optional) Tag to deploy"

    echo "-b <branch> (Optional) Branch to deploy"

    echo "-c <commit> (Optional) Commit to deploy"

    echo "-v <true|false> (Optional) If verbose"

    echo "-k <true|false> (Optional) If .git dir is kept on deploy_root"

    echo 

    echo "Examples:"

    echo "git.sh -a deploy -s $source -d $deploy_root -u $user -gs $git_subdir -t $tag -b $branch -c $commit -v $bool_verbose -k $bool_keep_gitdata"

}

verbose="true"

# Check Arguments

while [ $# -gt 0 ]; do

  case "$1" in

    -a)

      case $2 in

          rollback)

          action="rollback"

          ;;

          *)

          action="install"

          ;;

      esac 

      shift 2 ;;

    -s)

      if [ $source ] ; then

        source=$source

      else

        source=$2

      fi

      shift 2 ;;

    -d)

      if [ $deploy_root ] ; then

        deploy_root=$deploy_root

      else

        deploy_root=$2

      fi

      shift 2 ;;

    -u)

      if [ $user ] ; then

        deploy_user=$user

      else

        deploy_user=$2

      fi

      shift 2 ;;

    -gs)

      if [ $git_subdir ] ; then

        git_subdir=$git_subdir

      else

        git_subdir=$2

      fi

      shift 2 ;;

    -t)

      if [ $git_tag ] ; then

        git_tag=$git_tag

      else

        git_tag=$2

      fi

      shift 2 ;;

    -b)

      if [ $branch ] ; then

        branch=$branch

      else

        branch=$2

      fi

      shift 2 ;;

    -c)

      if [ $commit ] ; then

        commit=$commit

      else

        commit=$2

      fi

      shift 2 ;;

    -v)

      if [ $verbose ] ; then

        verbose=$verbose

      else

        verbose=$2

      fi

      shift 2 ;;

    -k)

      if [ $keep_gitdata ] ; then

        keep_gitdata=$keep_gitdata

      else

        keep_gitdata=$2

      fi

      shift 2 ;;

    *)

      showhelp

      exit ;;

  esac

done

if [ "x$verbose" == "xtrue" ] ; then

  verbosity=""

else

  verbosity="--quiet"

fi

cd /

gitsubdir=""

gitdir=$deploy_root

if [ "x$keep_gitdata" != "xtrue" ] ; then

  if [ ! -d $archivedir/$project-git ] ; then

    mkdir $archivedir/$project-git

    chown -R $deploy_user:$deploy_user $archivedir/$project-git

  fi

  gitdir=$archivedir/$project-git/gitrepo

fi

if [ "x$git_subdir" != "xundefined" ] ; then

  if [ ! -d $archivedir/$project-git ] ; then

    mkdir $archivedir/$project-git

    chown -R $deploy_user:$deploy_user $archivedir/$project-git

  fi

  gitdir=$archivedir/$project-git

  gitsubdir="$git_subdir/"

fi

do_install () {

  if [ -d $gitdir/.git ] ; then

    cd $gitdir

    git pull $verbosity origin $branch

    git checkout $verbosity $branch

    if [ "x$?" != "x0" ] ; then

      git checkout -b $verbosity $branch

    fi

  else

    git clone $verbosity --branch $branch --recursive $source $gitdir

    cd $gitdir

  fi

  if [ "x$git_tag" != "xundefined" ] ; then

    git checkout $verbosity $git_tag

  fi

  if [ "x$commit" != "xundefined" ] ; then

    git checkout $verbosity $commit

  fi

  if [ "x$gitdir" == "x$archivedir/$project-git/gitrepo" ] ; then

    rsync -a --exclude=".git" $gitdir/$gitsubdir $deploy_root/

  fi

}

do_rollback () {

  echo "Rollback not yet supported"

}

# Action!

case "$action" in

    install) export -f do_install ; su $deploy_user -c do_install ;;

    rollback) do_rollback ;;

esac