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#!/bin/sh -eu
usage() {
	printf "%s\n\n" "Usage: $0 [command...] [flags...] [args...]"
	printf "%s\n" "$0 add-repo [-s] <name> <key>"
	printf "\t%s\n" "Trusts <key> and adds the local repo to /etc/apk/repositories"
	printf "\t%s\n\n" "-s: set this key as default in abuild.conf"
	printf "%s\n" "$0 build [-cu] [-v <pkgver>] <packages...>"
	printf "\t%s\n" "Builds packages"
	printf "\t%s\n" "-c: update checksums"
	printf "\t%s\n" "-u: update pkgrel"
	printf "\t%s\n\n" "-v <pkgver>: update pkgver"
	printf "%s\n" "$0 pkgver"
	printf "\t%s\n\n" "Prints the suggested package ver for this directory"
	printf "%s\n" "$0 upload <ssh server> <remote path> <packages...>"
	printf "\t%s\n" "Uploads packages via rsync and updates remote APKINDEX"
}

get_pkgvar() (
	var="$1"
	set +u
	. APKBUILD
	eval 'printf "%s\n" "$'"$var"'"'
)

find_repos() (
	find . -maxdepth 1 -type d -not -name . -not -name .git
)

find_pkg_repo() (
	pkg=$1
	for repo in $(find_repos)
	do
		if [ -d "$repo"/"$pkg" ]
		then
			echo "$repo"
			return 0
		fi
	done
	return 1
)

update_pkgrel() (
	pkg="$1"
	pkgver="$(get_pkgvar pkgver)"
	prev_ver=$(apk search -x "$pkg" | cut -c$((${#pkg}+2))-)
	prev_pkgver=$(printf "%s" "$prev_ver" | cut -d'-' -f1)
	prev_pkgrel=$(printf "%s" "$prev_ver" | cut -d'-' -f2 | cut -d'r' -f2-)
	if [ "$prev_pkgver" == "$pkgver" ]
	then
		pkgrel=$((prev_pkgrel + 1))
		sed -e "s/pkgrel=.*/pkgrel=$pkgrel/" -i APKBUILD
	fi
)

update_pkgver() {
	pkgver="$1"
	prev_pkgver=$(apk search -x ${project} | cut -d '-' -f2)
	sed -e "s/pkgver=.*/pkgver=$pkgver/" -i APKBUILD
	if [ "$prev_pkgver" != "$pkgver" ]
	then
		sed -e "s/pkgrel=.*/pkgrel=0/" -i APKBUILD
	fi
}

add_repo() {
	set_default=0
	while getopts s flag
	do
		case $flag in
			s) set_default=1 ;;
			*) usage && exit 1 ;;
		esac
	done
	shift $((OPTIND-1))
	echo "$@"
	if [ $# -ne 2 ]
	then
		usage
		exit 1
	fi
	repo="$1"
	key="$2"
	mkdir -p ~/packages/$repo
	echo ~/packages/$repo | cat - /etc/apk/repositories > /tmp/repositories
	sudo mv /tmp/repositories /etc/apk/repositories
	if ! [ -f "$key" ]
	then
		echo "Warning: generating new abuild key"
		key="$HOME/.abuild/abuild.rsa"
		mkdir -p $HOME/.abuild
		(
			umask 0007
			openssl genrsa -out "$key" 2048
		)
	fi
	sudo openssl rsa -in $key -pubout \
		-out /etc/apk/keys/$(basename "$key").pub
	if [ $set_default -eq 1 ]
	then
		echo "PACKAGER_PRIVKEY="'"'$key'"' >> \
			~/.abuild/abuild.conf
	fi
}

build() (
	builddeps=0
	checksum=0
	updpkgrel=0
	pkgver=""
	# Disable progress on abuild-apk
	cat <<-"EOF" | sudo tee /usr/local/bin/abuild-apk
	#!/bin/sh
	exec /usr/bin/abuild-apk --no-progress $@
	EOF
	sudo chmod +x /usr/local/bin/abuild-apk
	export PATH=/usr/local/bin:$PATH
	while getopts Rcuv: flag
	do
		case $flag in
			R) builddeps=1 ;;
			c) checksum=1 ;;
			u) updpkgrel=1 ;;
			v) pkgver="$OPTARG" ;;
			*) usage && exit 1 ;;
		esac
	done
	shift $((OPTIND-1))
	if [ $# -eq 0 ]
	then
		echo "No packages specified."
		exit 1
	fi
	for pkg in $@
	do
		repo="$(find_pkg_repo "$pkg")"
		(
			cd "$repo"/"$pkg"
			if [ -n "$pkgver" ]
			then
				update_pkgver "$pkgver"
			fi
			if [ $updpkgrel -eq 1 ]
			then
				update_pkgrel "$pkg"
			fi
			if [ $checksum -eq 1 ]
			then
				abuild checksum
			fi
			if [ $builddeps -eq 1 ]
			then
				abuild -R
			else
				abuild -r
			fi
		)
	done
)

print_pkgver() {
	if [ $# -ne 0 ]
	then
		usage
		exit 1
	fi
	if [ -d .git ]
	then
		set +e
		pkgver=$(git describe --abbrev=0 2>/dev/null)
		if [ $? -ne 0 ]
		then
			pkgver=0
		fi
		set -e
		if ! git describe --exact-match HEAD >/dev/null 2>&1
		then
			cdate=$(git show -s -1 --format='%ci' HEAD)
			cdate=$(echo "$cdate" | cut -d' ' -f1 | sed -e 's/-//g')
			pkgver="${pkgver}_git${cdate}"
		fi
	elif [ -d .hg ]
	then
		pkgver=$(hg id -T '{latesttag}')
		if [ "$(hg id -T '{latesttagdistance}')" -ne 0 ]
		then
			pkgver="$(hg id -T '{latesttag}_hg{sub("-", "", date|shortdate)}')"
		fi
	else
		pkgver=unknown_0000
	fi
	echo "$pkgver"
}

mirror_ver() (
	mirror="$1"
	pkg="$2"
	apk policy "$pkg" | while read -r line
	do
		case "$line" in
			*:)
				ver="${line%:}"
				ver="${ver## }"
				;;
			*$mirror*)
				echo "$ver"
				;;
		esac
	done
)

get_aver() {
	aver="${REPOSITORY:-}"
	if [ ${#aver} -eq 0 ]
	then
		. /etc/os-release
		aver="v$(printf "%s" "$VERSION_ID" | cut -d. -f1-2)"
	fi
	echo "$aver"
}

upload_pkg() (
	repo="$1"
	pkg="$2"
	arch="$(uname -m)"
	aver="$(get_aver)"

	set -x
	path="$remote_path/$aver/$arch"
	ssh "$remote" mkdir -p "$path"

	url=$(echo "$remote" | cut -d@ -f2)
	prev_ver=$(mirror_ver "$url" "$pkg")

	for ver in $prev_ver
	do
		if [ "$prev_ver" != "none" ]
		then
			ssh "$remote" rm -f "$path/$pkg-$ver.apk"
		fi
	done
	pkgver="$(get_pkgvar pkgver)"
	pkgrel="$(get_pkgvar pkgrel)"

	rsync --blocking-io -rsP \
		~/packages/"$repo/$arch/$pkg-$pkgver-r$pkgrel.apk" "$remote":"$path/"
	set +x
)

update_index() (
	repo="$1"
	arch="$(uname -m)"

	. /etc/os-release
	aver="$(get_aver)"

	path="$remote_path/$aver/$repo/$arch"

	set -x
	ssh "$remote" \
		find "$path" -type f -name '*.apk' -print0 |
		ssh "$remote" xargs -0 apk index \
			--rewrite-arch "$(uname -m)" \
			-x "$path"/APKINDEX.tar.gz \
			-o "$path"/APKINDEX.unsigned.tar.gz
	rsync --blocking-io -rP \
		"$remote:$path/APKINDEX.unsigned.tar.gz" \
		/tmp/APKINDEX.tar.gz
	abuild-sign /tmp/APKINDEX.tar.gz
	rsync --blocking-io -rP /tmp/APKINDEX.tar.gz "$remote:$path/"
	set +x
)

upload() (
	if [ $# -lt 2 ]
	then
		usage
		exit 1
	fi
	remote="$1"
	remote_path="$2"
	shift 2
	if [ $# -eq 0 ]
	then
		echo "No packages specified"
		exit 1
	fi
	repos=""
	for pkg in $@
	do
		repo=$(find_pkg_repo "$pkg")
		if ! echo "$repos" | grep "$repo" >/dev/null
		then
			repos="$repo $repos"
		fi
		(
			cd "$repo"/"$pkg"
			arch="$(get_pkgvar arch)"
			subpkgs="$pkg:_:$arch $(get_pkgvar subpackages)"
			for subpkg in $subpkgs
			do
				name="$(echo "$subpkg" | cut -d':' -f1)"
				upload_pkg "$repo" "$name"
			done
		)
	done
	for repo in $repos
	do
		update_index $repo
	done
)

if [ $# -lt 1 ]
then
	usage
	exit 1
fi
cmd="$1"
shift

case "$cmd" in
	add-repo)
		add_repo "$@"
		;;
	build)
		build "$@"
		;;
	pkgver)
		print_pkgver "$@"
		;;
	upload)
		upload "$@"
		;;
	help|-h)
		usage
		;;
esac