Automatic Docker Build example

make.sh

#!/bin/bash

set -e

while [[ $# > 0 ]]
do
	case "$1" in
		--folder)
		shift
		FOLDER="$1"
		;;
		--opt)
		shift
                OPT="$1"
                ;;
                --tag)
		shift
                TAG="$1"
		;;
		--custom-docker-file)
		shift
                DOCKERFILE="$1"
		;;
		--repull)
		REPULL="repull"
		;;
		--no-cache)
		CACHE="--no-cache"
		;;
		--dry-run)
                DRY="true"
		;;
		*|--help)
		echo './make --tag localhost:5000/debian --folder /root/docker/debian --opt "git pull" --custom-docker-file Dockerfile.rpi --dry-run --repull --no-cache'
		exit 0
		;;
	esac
	shift
done

if [[ -z $TAG ]]; then
	echo 'check args -> ./make.sh --help'
	exit 1
fi

if [[ -z $OPT ]]; then
	OPT="none"
fi

function build() {
	TAGTMP=$TAG-tmp
	TAGOLD=$TAG-old:$(date +%Y%m%d)
	if [[ -z "${DOCKERFILE}" ]]; then
		DOCKERFILE="Dockerfile"
	fi
	cd $FOLDER
	BASE=$(cat $DOCKERFILE | grep -e 'FROM' | awk '{ print $2 }')
	echo "start update $TAG ( base image $BASE ) in folder $FOLDER with options ' $OPT $REPULL'"
        echo "start $(date)"
	if [[ $DRY ]]; then
		VERBOSE="echo"
	else
		VERBOSE="eval"
	fi
	if [[ "${OPT}" != "none" ]]; then
		echo -n "$(pwd) -> "
	        $VERBOSE "${OPT}"
	fi

        # update base image
	if [[ $REPULL ]]; then
	        $VERBOSE "docker pull $BASE"
	fi
	# build
        $VERBOSE "docker build -t $TAGTMP -f $DOCKERFILE $CACHE ."
	# retag existing image to -old
	OLDC="$(docker images | awk '{print $1}' | grep ^$TAG\$ | wc -l )"
	if [[ $OLDC > 0 ]]; then
        	$VERBOSE "docker tag $TAG $TAGOLD"
	fi
	# retag new image
	$VERBOSE "docker tag $TAGTMP $TAG"
	# untag tmp image
	$VERBOSE "docker rmi $TAGTMP"
	# push to registry
        #$VERBOSE "docker push $TAG"
        echo "stop $(date)"
}

FORMAT="$TAG_$(date +%F)_$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 6 | head -n 1)"
LOGPATH=/var/log/docker/build_$FORMAT.log

build | tee -a $LOGPATH

P="$?"

LOG=$(cat $LOGPATH)
if [[ $P -eq 0 ]]; then
	SU="true"
else
	SU="false"
fi

if [[ ! $DRY ]]; then
	/mnt/docker/clean.sh
fi