#!/bin/sh

# Core Deploy Script Functionality
# Written by Jason LaPorte (jason@agoragames.com)
# 
# Copyright (C) 2009 Agora Games, Inc.
#
# This software is provided 'as-is', without any express or implied warranty.
# In no event will the authors be held liable for any damages arising from the
# use of this software.
#
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
#
# 1.  The origin of this software must not be misrepresented; you must not
#     claim that you wrote the original software. If you use this software
#     in a product, an acknowledgment in the product documentation would be
#     appreciated but is not required.
# 2.  Altered source versions must be plainly marked as such, and must not be
#     misrepresented as being the original software.
# 3.  This notice may not be removed or altered from any source distribution.

if [ ! $LOGFILE ]; then
  echo "You must define LOGFILE in your script before sourcing the deploy core."
  exit 1
  fi

# define how to log messages and handle rollbacks.

ROLLBACK=

log () {
  echo "[`date '+%H:%M %D'`]" $@ >>$LOGFILE
}

run () {
  echo $1
  log $1

  test "$2" && ROLLBACK="$2 $ROLLBACK"

  $1 >>$LOGFILE 2>>$LOGFILE
  if [ $? != 0 ]; then
    echo "failed"
    log "failed"

    echo "rolling back"
    log "rolling back"

    for rollback in $ROLLBACK; do
      echo $rollback
      log $rollback

      $rollback >>$LOGFILE 2>>$LOGFILE
      if [ $? != 0 ]; then
        echo "also failed \(sorry today sucks. i love you, if it helps.\)"
        log "rollback failed"
        exit 2
        fi
      done

    exit 1
    fi
}

# below are core functions which are commonly used by rails apps. you can
# override them by redeclaring them after sourcing this file.

deploy () {
  svn -q export $REPOSITORY $NEW_RELEASE_DIR && \
    chmod -R g+w $NEW_RELEASE_DIR
}

undeploy () { rm -rf $NEW_RELEASE_DIR; }

symlink () {
  rm -f $CURRENT_DIR && \
    ln -s $NEW_RELEASE_DIR $CURRENT_DIR && \
    ln -s $SHARED_DIR/log $CURRENT_DIR/log && \
    ln -s $SHARED_DIR/pids $CURRENT_DIR/tmp/pids
}

unsymlink () {
  rm -f $CURRENT_DIR && \
    ln -s $OLD_RELEASE_DIR $CURRENT_DIR

  # we assume all the other symlinks are still in place from the prior deploy
}

migrate () { cd $CURRENT_DIR && rake db:migrate RAILS_ENV=production; }

restart () { touch $SHARED_DIR/pids/restart.touch; }

cleanup_old_releases () {
  ls -1cd $BASE/releases/* | tail -n +5 | xargs rm -rf
}