witchery-buildapk

#!/bin/sh -e

# witchery-buildapk - build APK from a filesystem
# Copyright (c) 2021 Ariadne Conill
# SPDX-License-Identifier: ISC

[ -z "$WITCHERY_ARCH" ] && WITCHERY_ARCH=$(abuild -A)
[ -z "$SOURCE_DATE_EPOCH" ] && SOURCE_DATE_EPOCH=$(date '+%s')
export SOURCE_DATE_EPOCH

usage() {
	cat <<-EOF
	usage: witchery-buildapk -n pkgname [options] DIR OUTPUT

	Builds package from artifacts located in DIR, copied to OUTPUT.

	Options:
		-n pkgname		Sets package name
		-v pkgver		Sets package version (default UNIX epoch)
		-r pkgrel		Sets package release (default 0)
		-d description		Sets package description
		-l license		Sets package license
		-m maintainer		Sets package maintainer
		-h			Display help
	EOF
	exit 0
}

msg() {
	echo "witchery-buildapk: $1"
}

setup_environment() {
	WORKDIR=$(mktemp -d)/witchery/"$WITCHERY_PKGNAME"

	mkdir -p $WORKDIR

	msg "Using $WORKDIR as working directory."
	cd $WORKDIR

	cat >"$WORKDIR"/APKBUILD <<-EOF
	# Maintainer: $WITCHERY_MAINTAINER
	pkgname=$WITCHERY_PKGNAME
	pkgver=$WITCHERY_PKGVER
	pkgrel=$WITCHERY_PKGREL
	pkgdesc="$WITCHERY_DESCRIPTION"
	license="$WITCHERY_LICENSE"

	prepare() {
		:
	}

	build() {
		:
	}

	check() {
		:
	}

	package() {
		:
	}
	EOF
}

buildit() {
	mkdir -p $2

	WITCHERY_FILESYSTEM=$(realpath $1)
	WITCHERY_OUTPUT=$(realpath $2)

	msg "Building the following:"
	msg "  Package: $WITCHERY_PKGNAME $WITCHERY_PKGVER-r$WITCHERY_PKGREL"
	msg "  Source Directory: $WITCHERY_FILESYSTEM"

	setup_environment

	mkdir -p "$WORKDIR"/pkg "$WORKDIR"/out
	cp -ar "$WITCHERY_FILESYSTEM" "$WORKDIR"/pkg/"$WITCHERY_PKGNAME"

	msg "Invoking abuild to generate an APK."
	abuild -P "$WORKDIR"/out prepare_package create_apks

	mv "$WORKDIR"/out/witchery/"$WITCHERY_ARCH"/"$WITCHERY_PKGNAME"*.apk "$WITCHERY_OUTPUT"/

	rm -rf $WORKDIR

	msg "Generated APK available in $WITCHERY_OUTPUT"
}

while getopts "n:v:r:d:l:m:h" opt; do
	case $opt in
	'n')	WITCHERY_PKGNAME=$OPTARG ;;
	'v')	WITCHERY_PKGVER=$OPTARG ;;
	'r')	WITCHERY_PKGREL=$OPTARG ;;
	'd')	WITCHERY_DESCRIPTION=$OPTARG ;;
	'l')	WITCHERY_LICENSE=$OPTARG ;;
	'm')	WITCHERY_MAINTAINER=$OPTARG ;;
	'h')	usage ;;
	esac
done
shift $(( $OPTIND - 1 ))

[ -z "$WITCHERY_PKGNAME" ] && usage
[ -z "$WITCHERY_PKGVER" ] && WITCHERY_PKGVER=$SOURCE_DATE_EPOCH
[ -z "$WITCHERY_PKGREL" ] && WITCHERY_PKGREL=0
[ -z "$WITCHERY_DESCRIPTION" ] && WITCHERY_DESCRIPTION='package generated with witchery-buildapk'
[ -z "$WITCHERY_LICENSE" ] && WITCHERY_LICENSE="Unspecified"
[ -z "$WITCHERY_MAINTAINER" ] && WITCHERY_MAINTAINER="Witchery <https://github.com/kaniini/witchery>"
[ -z $1 ] && usage
[ -z $2 ] && usage

buildit $1 $2