build.sh

#!/bin/bash

PACKAGE=vips
DATE=`date --iso-8601=minutes`
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"

if [ -z "${DISTRIBUTION}" ]; then
	echo Define environment variable DISTRIBUTION "(e.g. focal)"
	exit 1
fi

if [ -z "${DISTVERSION}" ]; then
	echo Define environment variable DISTVERSION "(e.g. 20.04)"
	exit 1
fi

if [ -z "${PACKAGE}" ]; then
	echo Define environment variable PACKAGE "(e.g. vips)"
	exit 1
fi

echo Building base image:

docker build -t build-$PACKAGE:$DISTVERSION -f $DIR/Dockerfile-$PACKAGE-$DISTVERSION $DIR || (echo build failed 1>&2 && exit 1)

echo

if [ ! -d ~/.buildvers ]; then
	mkdir -p ~/.buildvers
fi

echo Checking newest version...
NEWVERSION=`docker run --rm build-$PACKAGE:$DISTVERSION bash -c "apt-get -qq update && rmadison $PACKAGE | grep $DISTRIBUTION | sed 's/$PACKAGE . //;s/ . $DISTRIBUTION.*//;s/ //g;'"`

if [ -f ~/.buildvers/$PACKAGE-$DISTRIBUTION ]; then
	OLDVERSION=`cat ~/.buildvers/$PACKAGE-$DISTRIBUTION`
	if [ "$OLDVERSION" = "$NEWVERSION" ]; then
		echo Versions match, no need to update
		exit
	fi
	echo Version changed from $OLDVERSION to $NEWVERSION, creating new package
else
	echo No old version found, creating new package for $NEWVERSION
fi

echo -n Press enter to continue or Ctrl-C to abort:' '
read

clean_gpg() {
	echo Cleaning GPG keys...
	rm -f /tmp/volume-$PACKAGE-$DISTRIBUTION/keys.asc
	rm -rf /tmp/volume-$PACKAGE-$DISTRIBUTION
}

trap clean_gpg SIGINT SIGTERM EXIT

mkdir -p /tmp/volume-$PACKAGE-$DISTRIBUTION
gpg --export-secret-keys --armor >> /tmp/volume-$PACKAGE-$DISTRIBUTION/keys.asc || (echo "Couldn't write GPG keys" && exit 1)

docker run --rm -i -e DATE=$DATE -v /tmp/volume-$PACKAGE-$DISTRIBUTION:/volume build-$PACKAGE:$DISTVERSION bash /within_container-$PACKAGE.sh
clean_gpg

echo -n Press enter to mark $NEWVERSION as successfully uploaded or Ctrl-C to abort:' '
read

echo $NEWVERSION > ~/.buildvers/$PACKAGE-$DISTRIBUTION