#!/bin/bash
ME=`basename $0`

function usage
{
	echo <<! >&2
Usage: $ME <build>
	<build> is the path to the build (p4chronicle-1234.5.LIVE-123456.tgz)

!
	exit 2
}

[ "$1" == "-h" ] && usage
[ `id -nu` != "root" ] && echo "please run this as root" && exit 1
[ -z "$1" ] && echo "specify build to deploy" && usage

BUILD="$1"
BUILD_NAME_PATTERN='p4chronicle-.*\.tgz'
basename "$BUILD" | grep -qx "$BUILD_NAME_PATTERN"
[ $? -ne 0 ] && echo "bad name for build [$BUILD]; expecting [$BUILD_NAME_PATTERN]" && exit 1
[ ! -r "$BUILD" ] && echo "cannot read [$BUILD]" && exit 1

BUILD_DIR=`cd $(dirname $BUILD); pwd`
BUILDS_DIR=/data/chronicle/builds
WWW_DIR=/data/chronicle/www
WWW_DIR_NAME=`basename $WWW_DIR`

[ ! -d $BUILDS_DIR ] && echo "bad builds dir [$BUILDS_DIR]" && exit 1
[ ! -d $WWW_DIR ] && echo "bad web dir [$WWW_DIR]" && exit 1
[ ! -d $WWW_DIR/data ] && echo "cannot find data dir in web dir [$WWW_DIR]" && exit 1

BUILD_TGZ_TLD=`tar -ztf $BUILD 2> /dev/null | head -n1 | awk -F/ '{print $1}'`
[ -z "$BUILD_TGZ_TLD" ] && echo "cannot get tld of build tarball" && exit 1

BUILD_IN_BUILDS_DIR=$BUILD_DIR/`basename $BUILD`

#for v in BUILD BUILD_NAME_PATTERN BUILD_DIR BUILDS_DIR WWW_DIR WWW_DIR_NAME BUILD_TGZ_TLD BUILD_IN_BUILDS_DIR
#do
#	echo -e "$v:\t${!v}"
#done
#echo "STOP HERE (pwd is `pwd`)" && exit 0

####################################################################
echo "$ME: `date`: Chronicle build deploy starting; untar'ing..."

[ "$BUILD_DIR" != "$BUILDS_DIR" ] && echo mv -v $BUILD $BUILDS_DIR/
cd `dirname $WWW_DIR` || exit 1

tar -zxf $BUILD_IN_BUILDS_DIR
[ ! -d $BUILD_TGZ_TLD ] && echo "cannot find [$BUILD_TGZ_TLD] in [$PWD]; abort" && exit 1

echo "$ME: `date`: Untar'ing complete; stoping Apache..."
apachectl graceful-stop || exit 1
echo "$ME: `date`: Apache stopped; copying data dir to new build dir..."

cp -pr $/data/* $BUILD_TGZ_TLD/data/
[ ! -d $BUILD_TGZ_TLD/data/resources ] && echo "WARNING: can't find [$BUILD_TGZ_TLD/data/resources]"

echo "$ME: `date`: Copy done; changing permissions..."
chown www-data $BUILD_TGZ_TLD/data

echo "$ME: `date`: Permissions fixed; moving build into place..."
mv -v $WWW_DIR_NAME $WWW_DIR_NAME.old.`date +%Y%m%d%H%M%S`
mv -v $BUILD_TGZ_TLD $WWW_DIR_NAME

apachectl start
echo "$ME: `date`: Build deployment complete, Apache started"