shell script to automate Docker image rebuilding

docker-build-push.sh

#!/bin/bash -e

dirname=${PWD##*/}
if (echo $dirname | grep docker); then
    dirname=${dirname##docker-}
fi

registry=${DOCKER_REGISTRY:=registry.tst.ape.yandex.net:5000}
namespace=${DOCKER_NAMESPACE:=nikicat}

to=$registry/$namespace/$dirname


from=`grep '^FROM ' Dockerfile | sed -r "s|^FROM *(.*)$|\1|"`

if (echo $from | grep "^yandex/"); then
    if [ "$1" = "-l" ]; then
        from=`echo "$from" | sed -r "s|^yandex/|$namespace/|"`
    fi
    from="$registry/$from"
fi

docker-build.sh $from $to
docker push $to

docker-build.sh

#!/bin/sh

from="$1"
shift
to="$1"
shift

if [ -z "$from" ] || [ -z "$to" ]; then
    echo "Usage: $0 <from> <to>"
    exit 1
fi

function restore_dockerfile() {
    mv Dockerfile{.orig,}
}


cp Dockerfile{,.orig}
trap restore_dockerfile EXIT TERM INT
sed -ri "s|^FROM (.*)$|FROM $from|" Dockerfile
docker build -t $to .