post-receive

#!/usr/bin/env bash

# Deployment of Jekyll-Sites via Git Bare Repository and post-receive hook.
#
# https://github.com/fl3a/jekyll_deployment
#
# USAGE:
# - git hook: Place this script as .hooks/post-receive within your git repository
# - standalone: ${SCRIPT} /path/to/git-bare-repository
set -o errexit
set -o xtrace

function is_bare_repo () {
  cd $1 && test $(git rev-parse --is-bare-repository) == "true" \
    && return 0 || return 1 
}

function check_parameter() {
  if [ -z "$1" ]; then
    read oldrev newrev ref 
    pushed_branch=${ref#refs/heads/} 
  elif is_bare_repo $1; then
    pushed_branch=
  else
    exit
  fi
}

function configure() {
  config=$(mktemp)
  git show ${pushed_branch:-HEAD}:deploy.conf > $config || exit 
  source $config
  if [ -z "$pushed_branch" ]; then
    pushed_branch=$build_branch
  fi
  test "$pushed_branch" != "$build_branch" && exit 
  if [ -f "$extra_vars" ]; then 
    source $extra_vars
  fi
}

function build() {
  tmp=$(mktemp -d)
  git clone --single-branch --branch $build_branch $git_repo $tmp
  cd $tmp
  bundle install || bundle install --redownload
  JEKYLL_ENV=${env:-production} \
    JEKYLL_BUILD_REVISION=$rev \
    JEKYLL_GITHUB_TOKEN=$JEKYLL_GITHUB_TOKEN \
    bundle exec jekyll build --source $tmp --destination $www $build_suffix
}

function cleanup() {
  rm -rf $tmp $config
}

trap cleanup ERR SIGINT SIGKILL
check_parameter $1
configure
build
cleanup
eval $post_exec