Heroku like deployment git hooks

post-receive.sh

#!/bin/bash
# (Re)spawn the application

function spawn () {
        local ps_name=$1
        local spawn_cmd=$2
        local pids=`ps -C $ps_name -o pid=`
        if [ ${#pids} -ne 0 ]
        then
                echo "Sending TERM to $pids..." 
                killall -s 15 $ps_name -w
        fi
        echo "Starting the app..."
        cd ..
        GIT_DIR='.git'
        git reset --hard HEAD
        ( exec setsid $spawn_cmd > ~/foreman.log 2>&1 & ) &
}

# Load RVM
[[ -s "/usr/local/rvm/scripts/rvm" ]] && . "/usr/local/rvm/scripts/rvm"
spawn "foreman" "foreman start -e env"

pre-receive.sh

#!/bin/bash
# <oldrev> <newrev> <refname>
# Deploy new git commits

bundle_cmd="bundle install --path ~/.bundle --without development --binstubs ~/bin"

function bundle () {
        local rev="$1"
        local gemfile_changed=0
        # Find HEAD
        if [ -f 'refs/heads/master' ]
        then
                head=`cat refs/heads/master`
        fi
        # Update gemfile
        local gemfile_info=`git diff-tree --name-only $rev $head | grep Gemfile`
        # If gemfile was changed or head doesn't exist
        if [ ${#gemfile_info} -ne 0 ] || [ ${#head} -eq 0 ]
        then
                echo "Gemfile updated..."
                local gemfile_info=`git ls-tree --full-name $rev Gemfile`
                local gemfile_sha=${gemfile_info%Gemfile*}
                local gemfile_sha=${gemfile_sha: -41}
                git cat-file blob $gemfile_sha > ../Gemfile
                gemfile_changed=1
        fi
        # Run bundler with the new gemfile
        if [ $gemfile_changed -ne 0 ]
        then
                echo "Running bundler..."
                cd ..
                exec $bundle_cmd
                cd .git
                rm -f ../Gemfile
        fi
}


# Load RVM
[[ -s "/usr/local/rvm/scripts/rvm" ]] && . "/usr/local/rvm/scripts/rvm"
while read oldrev newrev ref
do
        if [ "${ref: -6}" == "master" ]
        then
                echo "Master branch changes. Starting the deployment..."
                bundle $newrev $oldrev
        fi
done