deploy.sh

deploy.sh

#!/bin/bash
#==============================================================================
#
# Script for automated deployments.
#
# This system expects at least the following directories to exists:
#
# * ../../temp
# * ../../transfer
# * ../../testing
# * ../../staging
# * ../../production
#
# Default deployment target is "testing". You can specify a different
# target (one of "testing", "staging" and "production") as first parameter
# to this script  
#
#==============================================================================

# === Configuration ===

# which directories to synchronize / deploy:

DIR_LIST="bin build contrib doc htdocs src"

# temporary space, attention, gets cleaned each run! (do NOT use /tmp!)
# this directory holds ONE backup copy of the changed directies of the
# LAST deployment run. 

TEMP_DIR=temp

# marker, if a deployment is still running and/or failed ..

LOCK_FILE=/tmp/deployment.lck

# default deployment: transfer to testing

SOURCE_SYSTEM=transfer
TARGET_SYSTEM=testing

#==============================================================================

# remember current directory ..
CWD=`pwd`

# if this script is symlinked, fetch the "real" thing ..
SCRIPT=`readlink $0`
if test -z "$SCRIPT"
then
	SCRIPT=$0
fi

# where is this script located?
CMD_DIR=`dirname $SCRIPT`

# change to root of "systems" directory
# (aka the dir containing the production, staging, transfer etc directories)

cd $CMD_DIR/../../..

# check, what kind of deployment (testing, staging, production) is requested:
#
# transfer		=> testing
# testing		=> staging
# staging		=> production
#

if test -n "$1"
then

	case $1 in
	
		testing)
			SOURCE_SYSTEM=transfer
			TARGET_SYSTEM=testing
			;;
			
		staging)
			SOURCE_SYSTEM=testing
			TARGET_SYSTEM=staging
			;;
			
		production)
			SOURCE_SYSTEM=staging
			TARGET_SYSTEM=production
			;;
			
		*)
			echo "ERROR: unsupported deployment to [$1]!"
			exit 1
			;;
	esac
fi

# check if the needed directories exist:

for DIR in "$TEMP_DIR" "$SOURCE_SYSTEM" "$TARGET_SYSTEM"
do
	if test \! -d  "$DIR"
	then
		echo "ERROR: directory $DIR does not exist!"
		exit 1
	fi 
done

# tell the user what we are about to do ..
echo "ATTENTION: About to deploy from \"$SOURCE_SYSTEM\" to => \"$TARGET_SYSTEM\" <="
echo "           Directories: $DIR_LIST"

# ask for confirmation (except for testing deployments)

if test \! "$TARGET_SYSTEM" = "testing"
then
	echo "           Enter \"yes\" in order to commence the deployment."
	echo -n "(yes/no)? "
	
	read YESNO
	
	if test \! "yes" = "$YESNO"
	then 
		echo "USER ABORTED PROCESS."
		exit 0
	fi
fi

if test -f "$LOCK_FILE"
then
	echo "ERROR: Lock file $LOCK_FILE exists, a deployment still running?"
	echo "FATAL ERROR - ABORTING!"
	exit 1
else
	touch $LOCK_FILE
fi

echo -n "Cleaning $TEMP_DIR directory ... "
rm -rf $TEMP_DIR/* ||
	(echo "FATAL ERROR - ABORTING!" && exit 1)
echo "OK"

echo "Creating $TARGET_SYSTEM backups ..."
for DIR in $DIR_LIST
do
	echo -n "  copying: $DIR to $TEMP_DIR ... "
	cp -a $TARGET_SYSTEM/$DIR $TEMP_DIR/${DIR}		||
		(echo "FATAL ERROR - ABORTING!"	&& exit 1)
	echo "OK"
done
echo "  DONE";

echo "Preparing new directories from $SOURCE_SYSTEM ..."
for DIR in $DIR_LIST
do
	echo -n  "  copying: $DIR to $TEMP_DIR/$DIR.new ... "
	cp -a $SOURCE_SYSTEM/$DIR $TEMP_DIR/${DIR}.new		||
		(echo "FATAL ERROR - ABORTING!"	&& exit 1)
	echo "OK"
done
echo "  DONE";

echo "Switching to new version..."
for DIR in $DIR_LIST
do
	echo -n "  moving: $TEMP_DIR/$DIR.new to $DIR ... "
	mv --no-target-directory $TARGET_SYSTEM/$DIR $TARGET_SYSTEM/${DIR}.old	&&
	mv --no-target-directory $TEMP_DIR/$DIR.new $TARGET_SYSTEM/${DIR} 	||
		(mv --no-target-directory $TARGET_SYSTEM/${DIR}.old $TARGET_SYSTEM/$DIR &&
			echo "FATAL ERROR - ABORTING!"	&& exit 1)
	echo "OK"
done
echo "  DONE";

echo "Cleaning up backup directories..."
for DIR in $DIR_LIST
do
	echo -n "  deleting: $DIR.old ... "
	rm -rf $TARGET_SYSTEM/${DIR}.old 	||
		( echo "FATAL ERROR - ABORTING!"	&& exit 1 )
	echo "OK"
done

cd $CWD
rm $LOCK_FILE

echo "  DONE";
echo "SUCCESS: PROCESS FINISHED OK!";