#!/usr/bin/env sh

# This script creates:
# - a control.tar.gz containing the .PKGINFO file
# - compressed data in the file 'data.tar.gz'
# - a signature file
#   remember to create your own RSA keys with "abuild-keygen -a"
# - the final .apk package

msg(){
	echo -e "\e[31m>>\e[0m $*"
}

apk="$1"
gzip="gzip"

set -e

# (in case of multiple runs of this script within the same directory)
sed "/datahash =/d" .PKGINFO  > .PKGINFO.new
mv .PKGINFO.new .PKGINFO

# data.tar.gz
set -- *

SOURCE_DATE_EPOCH=$(date -u "+%s")
# normalize timestamps
find . -exec touch -h -d "@$SOURCE_DATE_EPOCH" {} +

file_list=$(ls | grep -vE "(data.*|control.*)")
tar --xattrs -f - -c ${file_list} | abuild-tar --hash | $gzip -9 >data.tar.gz

msg "Create checksum..."
# append the hash for data.tar.gz
sha256=$(sha256sum data.tar.gz | cut -f1 -d' ')
echo "datahash = $sha256" >> .PKGINFO

# control.tar.gz
tar \
	--format=posix \
	--pax-option=exthdr.name=%d/PaxHeaders/%f,atime:=0,ctime:=0 \
	--mtime="@${SOURCE_DATE_EPOCH}" \
	-f - -c .PKGINFO | abuild-tar --cut \
	| $gzip -n -9 > control.tar.gz
abuild-sign -q control.tar.gz || exit 1

msg "Create $apk"
cat control.tar.gz data.tar.gz > $apk

rm data.* 2>/dev/null || :
rm control.* 2>/dev/null || :