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#!/bin/sh

# script to build apk packages (light version og makepkg)
# Copyright (c) 2008 Natanael Copa <natanael.copa@gmail.com>
#
# Distributed under GPL-2
#
# Depends on: busybox utilities, fakeroot, 
#

myver=0.2

# read config
MAKEAPK_CONF=${MAKEAPK_CONF:-/etc/abuild.conf}
[ -f "$MAKEAPK_CONF" ] && . "$MAKEAPK_CONF"

startdir="$PWD"
srcdir=${srcdir:-"$startdir/src"}
pkgdir=${pkgdir:-"$startdir/pkg"}
pkgrel=0

# defaults
SRCDEST=${SRCDEST:-$startdir}
PKGDEST=${PKGDEST:-$startdir}

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default_cmds="checkdeps clean fetch unpack rootpkg"
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all_cmds="checksum fetch unpack rootpkg build package cleancache clean srcpkg"

# functions
vecho() {
	local sub=
	[ -n "$INSUB" ] && sub="(sub)"
	[ -z "$quiet" ] && echo ">>> $pkgname:" "$@" $sub >&2
}

warning() {
	echo ">>> Warning:" "$@" >&2
}

die() {
	quiet=
	vecho "$@" >&2
	exit 1
}

# check if we have needed packages to build this thing
checkdeps() {
	local i
	local missing=
	for i in $makedepends; do
		apk_info -e $i || missing="$missing $i"
	done
	[ -z "$missing" ] && return 0
	warning "Missing makedepends: $missing"
	return 1
}

checkmd5() {
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	( cd "$SRCDEST" && echo "$md5sums" | awk '$2 == "'$1'" { print $0 } ' \
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		| md5sum -c )
}

uri_fetch() {
	local uri="$1"
	local d="${s##*/}"	# $(basename $s)
	local q
	[ -n "$quiet" ] && q="-q"
	mkdir -p "$SRCDEST"
	if ! [ -f "$SRCDEST/$d" ] || ! checkmd5 "$d" 2>/dev/null; then
		rm -f "$SRCDEST/$d"
		wget $q -c -P "$SRCDEST" "$uri" && checkmd5 "$d" 
	fi
}

fetch() {
	local s
	mkdir -p "$srcdir"
	for s in $source; do 
		case "$s" in
			http://*|ftp://*)
				uri_fetch "$s" || return 1
				;;
			*)
				[ -n "$genchecksum" ] && continue
				checkmd5 "${s##*/}" || return 1
				;;
		esac
		ln -sf "$SRCDEST/${s##*/}" "$srcdir"/
	done
}

# unpack the sources
unpack() {
	local u
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	[ -z "$md5sums" ] && die "Use 'abuild checksum >>$APKBUILD' to generate a checksum"
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	mkdir -p "$srcdir"
	for u in $source; do
		local s="$SRCDEST/${u##*/}"	# $(basename $s)
		case "$s" in
			*.tar.gz)
				tar -C "$srcdir" -zxf "$s" || return 1;;
			*.tar.bz2)
				tar -C "$srcdir" -jxf "$s" || return 1;;
		esac
	done
}

# cleanup source and package dir
clean() {
	rm -rf "$srcdir"
	rm -rf "$pkgdir"
	local i
	for i in $subpackages; do
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		rm -rf "$pkgdir-$i"
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	done
}

# cleanup fetched sources
cleancache() {
	local s
	for s in $source; do
		case "$s" in
			http:/*|ftp:/*)
				rm -f "$SRCDIR/$(basename $s)";;
		esac
	done
}

cleanpkg() {
	local p=$pkgname-$pkgver
	[ $pkgrel -ne 0 ] && p="$p-r$pkgrel"
	rm -f "$PKGDEST/$p.apk" "$PKGDEST/$p.src.tar.gz"
	local i
	for i in $subpackages; do
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		INSUB=1 subpkgdir="$pkgdir-$i" $0 $i cleanpkg
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	done
}

runpart() {
	local part=$1
	vecho "$part"
	$part || die "$part failed"
}

# override those in your build script
build() {
	die "No build() function found in $APKBUILD"
}

subpkg() {
	[ -z "$subpackages" ] && return 0
	local i
	cd "$startdir"
	for i in $subpackages; do
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		INSUB=1 subpkgdir="$pkgdir-$i" $0 $i package || return 1
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	done
}

package_apk() {
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	local dir=${subpkgdir:-$pkgdir}
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	local p="$pkgname-$pkgver"
	[ "$pkgrel" -ne 0 ] && p="$p-r$pkgrel"
	local pkg="$p.apk"
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	local db="$dir/var/db/apk/$p"
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	mkdir -p "$db"
	echo "$arch" > "$db/ARCH"
	echo "$pkgdesc" > "$db/DESC"
	echo "$license" > "$db/LICENSE"
	echo "$depends" > "$db/DEPEND"
	echo "$url" > "$db/WWW"
	local i
	for i in pre-install post-install pre-deinstall post-deinstall; do
		[ -f ../$i ] && cp ../$i "$db"/
	done
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	( cd "$dir" && tar -zcf "$PKGDEST/$pkg" * )
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}

package() {
	package_apk
}

# predefined subpackage doc
doc() {
	pkgname="$pkgname-doc"
	depends=""
	local i
	for i in doc man info html sgml; do
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		if [ -d "$pkgdir/usr/share/$i" ]; then
			mkdir -p "$subpkgdir/usr/share"
			mv "$pkgdir/usr/share/$i" "$subpkgdir/usr/share/"
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		fi
	done
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	# remove if empty, ignore error (not empty)
	rmdir "$pkgdir/usr/share" "$pkgdir/usr" 2>/dev/null

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	[ -d "$subpkgdir/usr/share/man" ] && depends="man"
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	return 0
}

# predefined subpackage mod
mod() {
	pkgname="$pkgname-mod"
	depends="$kernel"
	for i in firmware modules; do
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		if [ -d "$pkgdir/lib/$i" ]; then
			rm -rf "$subpkgdir/lib"
			mkdir -p "$subpkgdir/lib"
			mv "$pkgdir/lib/$i" "$subdir/lib"
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		fi
	done
}

# predefined subpackage dev
dev() {
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	depends="$pkgname"
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	pkgname="$pkgname-dev"
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	for i in $(cd "$pkgdir" && find usr/lib -name '*.a' -o \
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			-name '*.la' -o -name '*.o' 2>/dev/null) \
			usr/include usr/lib/pkgconfig usr/share/aclocal; do
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		if [ -e "$pkgdir/$i" ] || [ -L "$pkgdir/$i" ]; then
			d="$subpkgdir/${i%/*}"	# dirname $i
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			mkdir -p "$d"
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			mv "$pkgdir/$i" "$d"
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		fi
	done
}

# build and package in fakeroot
rootpkg() {
	fakeroot $0 build subpkg package
}

srcpkg() {
	local p="$pkgname-$pkgver"
	[ "$pkgrel" -ne 0 ] && p="$p-r$pkgrel"
	local prefix="${PWD##*/}"
	local i files="$prefix/APKBUILD"
	for i in $source; do
		files="$files $prefix/${i##*/}"
	done
	mkdir -p "$PKGDEST"
	(cd .. && tar -zcf $PKGDEST/$p.src.tar.gz $files) 
}

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# check if package is up to date
up2date() {
	local p="$pkgname-$pkgver"
	[ "$pkgrel" -ne 0 ] && p="$p-r$pkgrel"
	local pkg="$PKGDEST/$p.apk"
	local i s
	[ -f "$pkg" ] || return 1
	for i in $source APKBUILD; do
		local s="$SRCDEST/${i##*/}"	# $(basename $i)
		if [ "$s" -nt "$pkg" ]; then
			return 1
		fi
	done
	return 0
}

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usage() {
	echo "$(basename $0) $myver"
	echo "usage: $0 [options] [cmd] ..."
	echo "Options:"
	echo " -h  Show this help"
	echo " -f  Force specified cmd, even if they are already done"
	echo " -q  Quiet"
	echo ""
	echo "Commands:"
	echo "  checksum   Generate checksum to be included in $APKBUILD"
	echo "  fetch      Fetch sources to \$SRCDEST and verify checksums"
	echo "  unpack     Unpack sources to \$srcdir"
	echo "  build      Compile and install package into \$pkgdir"
	echo "  package    Create package in \$PKGDEST"
	echo "  rootpkg    Run '$0 build package' as fakeroot"
	echo "  clean      Remove temp build and install dirs"
	echo "  cleanpkg   Remove already built binary and source package"
	echo "  cleancache Remove downloaded files from \$SRCDEST"
	echo "  srcpkg     Make a source package"
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	echo "  up2date    Compare target and sources dates"
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	echo ""
	exit 0
}

checksum() {
	local s files
	for s in $source; do
		files="$files ${s##*/}"
	done
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	md5sums="$(cd "$SRCDEST" && md5sum $files)" || die "md5sum failed"
	echo "md5sums=\"$md5sums\""
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}

APKBUILD="${APKBUILD:-./APKBUILD}"

while getopts "hfq" opt; do
	case $opt in
		'h') usage;;
		'f') force=1;;
		'q') quiet=1;;
	esac
done
shift $(( $OPTIND - 1 ))

# source the buildfile
[ -f "$APKBUILD" ] || die "Could not find $APKBUILD (PWD=$PWD)"
. "$APKBUILD"

# If we are handling a sub package then reset subpackages
[ -n "$INSUB" ] && subpackages=

trap 'die "Aborted by user"' INT

[ -n "$forceunpack" ] && rm -f "$srcdir"/.unpack


if [ -z "$1" ]; then
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	if up2date && [ -z "$force" ]; then
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		vecho "Package is up to date"
	else
		set $default_cmds
	fi
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fi

while [ $# -gt 0 ]; do
	runpart $1
	shift
done