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#!/bin/bash

# IMPORTANT REQUIREMENTS
#   * Make sure the git-user is allowed to perform operations on behalf of 
#     www-data (without password) by adding this line to `/etc/sudoers`:
#    `git ALL=(www-data) NOPASSWD: /usr/bin/git, /bin/mkdir`
#   * Make sure `var/www` is owned by www-data:www-data by executing
#     `sudo chown -R www-data:www-data /var/www`
#   * Add www-data to the git-group by executing `sudo usermod -a -G git www-data`
#   * Make sure this file is executable by executing
#     `chmod +x post-receive`
#   * Make sure to have a `.gitconfig` file in place in `WWW_USER`s
#     home directory (`/var/www` for `www-data` by default) where
#     at least `user.name` and `user.email` are specified.


# Location of the Git Bare-Repository
unset GIT_DIR # Reset GITs environment variables (Source: https://goo.gl/bzXaBg)
GIT_DIR=/home/git/website-chiva.git

# Directories to deploy to & their respective branches
declare -A SITE_DIRS
SITE_DIRS=( ["/var/www/chiva.info"]=master )

# Prefix to execute commands with another user (replace `www-data` with your nginx/apache user)
# IMPORTANT: Add this line to `/etc/sudoers` to allow specific commands without
#            password-prompt: `git ALL=(www-data) NOPASSWD: /usr/bin/git, /bin/mkdir`.
WWW_USER=www-data

# If the push is done by the local `WWW_USER` the hook shouldn't be executed
if [[ $(whoami) == $WWW_USER ]]; then
    echo "-> Pushed by $WWW_USER. No deployment needed."
    exit
fi

# Iterate over all paths to deploy to
for SITE_DIR in "${!SITE_DIRS[@]}"
do
  echo "-> Deploy to $SITE_DIR.."

  # Check whether the site-directory exists or not
  if [ -d "$SITE_DIR" ]; then

    # Discard local changes and pull updates from repository
    echo "-> Directory exists already.."
    cd $SITE_DIR

    # Be sure the repository ignores file-permissions & select simple push-mode
    echo "-> (Re-)Configure Repository.."
    sudo -u $WWW_USER git --work-tree=./ config core.fileMode false
    sudo -u $WWW_USER git --work-tree=./ config push.default simple

    echo "-> Revert all local changes.."
    sudo -u $WWW_USER git --work-tree=./ clean -ffd
    sudo -u $WWW_USER git --work-tree=./ checkout -f ${SITE_DIRS[$SITE_DIR]}

    echo "-> Pull changes.."
    sudo -u $WWW_USER git --work-tree=./ pull

    echo "-> (Re-)Initialize Submodules.."
    sudo -u $WWW_USER git --wotk-tree=./ submodule sync
    sudo -u $WWW_USER git --work-tree=./ submodule update --init --recursive


  else

    # Completely clone the repository if the directory doesn't exist yet
    echo "-> Directory doesn't exist yet.."

    echo "-> Recursive Cloning.."
    sudo -u $WWW_USER git clone --recursive -b ${SITE_DIRS[$SITE_DIR]} --single-branch $GIT_DIR $SITE_DIR

    cd $SITE_DIR

    echo "-> Create some necessary directories for Kirby.."
    sudo -u $WWW_USER mkdir -p thumbs
    sudo -u $WWW_USER mkdir -p site/accounts
    sudo -u $WWW_USER mkdir -p site/cache

    # Be sure the repository ignores file-permissions & select simple push-mode
    echo "-> (Re-)Configure Repository.."
    sudo -u $WWW_USER git --work-tree=./ config core.fileMode false
    sudo -u $WWW_USER git --work-tree=./ config push.default simple

  fi

done