abuild: support subpackages="pkg:split:arch" syntax

For proper cross-build support, the subpackage arch needs to
be known before invoking the split function. This implements
a way to do that. This also changes to write the actual subpkg
arch to .PKGINFO - apk index --rewrite-arch still overwrites
index to have machine arch for noarch packages.

abuild.in

@@ -441,6 +441,28 @@ cleancache() {
 	done
 }
 
+subpkg_unset() {
+	unset subpkgname subpkgsplit subpkgarch
+}
+
+subpkg_set() {
+	subpkgname=${1%%:*}
+
+	local _splitarch=${1#*:}
+	[ "$_splitarch" = "$1" ] && _splitarch=""
+
+	subpkgsplit=${_splitarch%%:*}
+	[ -z "$subpkgsplit" ] && subpkgsplit="${subpkgname##*-}"
+
+	subpkgarch=${_splitarch#*:}
+	if [ "$subpkgarch" = "$_splitarch" -o -z "$subpkgarch" ]; then
+		case "$subpkgname" in
+		*-doc | *-lang | *-lang-*) subpkgarch="noarch" ;;
+		*) subpkgarch="$pkgarch" ;;
+		esac
+	fi
+}
+
 listpkgnames() {
 	local i
 	for i in $pkgname $subpackages; do
@@ -575,18 +597,6 @@ targz() {
 	tar -czf "$PKGDEST"/$pkgname-$pkgver-r$pkgrel.tar.gz *
 }
 
-get_split_func() {
-	# get the 'func' from "sub-pkg:func:arch"
-	local _splitarch=${1#*:}
-	[ "$_splitarch" = "$1" ] && _splitarch=""
-	local _split=${_splitarch%:*}
-	if [ -z "$_split" ]; then
-		local _name=${1%%:*}
-		_split="${_name##*-}"
-	fi
-	echo $_split
-}
-
 postcheck() {
 	local dir="$1" name="$2" i=
 	msg "Running postcheck for $name"
@@ -678,20 +688,17 @@ pre_split() {
 	# the subpackages should not inherit those form main package
 	provides=""
 	install_if=""
-	apkbuild_arch="$arch"
 }
 
 prepare_subpackages() {
 	local i
 	cd "$startdir"
 	for i in $subpackages; do
-		local func=$(get_split_func $i)
 		# call abuild recursively, setting subpkg{dir,name}
-		msg "Running split function $func..."
-		local dir="$pkgbasedir/${i%%:*}" name="${i%%:*}"
-		( subpkgdir="$dir" subpkgname="$name" \
-			$0 pre_split $func prepare_package \
-			&& postcheck "$dir" "$name" ) || return 1
+		( subpkg_set "$i"; msg "Running split function $subpkgsplit..."; \
+		  subpkgdir="$pkgbasedir/$subpkgname" subpkgname="$subpkgname" subpkgarch="$subpkgarch" \
+		  $0 pre_split $subpkgsplit prepare_package \
+			&& postcheck "$pkgbasedir/$subpkgname" "$subpkgname" ) || return 1
 	done
 	postcheck "$pkgdir" "$pkgname" || return 1
 	# post check for /usr/share/locale
@@ -704,7 +711,7 @@ prepare_subpackages() {
 default_lang() {
 	pkgdesc="Languages for package $pkgname"
 	install_if="$pkgname=$pkgver-r$pkgrel lang"
-	arch="noarch"
+
 	local dir
 	for dir in ${langdir:-/usr/share/locale}; do
 		mkdir -p "$subpkgdir"/${dir%/*}
@@ -722,8 +729,8 @@ default_lang_subpkg() {
 		return 1
 	fi
 	pkgdesc="$pkgname language pack for $lang"
-	arch="noarch"
 	install_if="$pkgname=$pkgver-r$pkgrel lang-$lang"
+
 	local dir
 	for dir in ${langdir:-/usr/share/locale}; do
 		mkdir -p "$subpkgdir"/$dir
@@ -787,8 +794,8 @@ check_depends_dev() {
 	fi
 	local i
 	for i in $pkgname $subpackages; do
-		case "$i" in
-			*-dev)  return 0 ;;
+		case "${i%%:*}" in
+		*-dev) return 0 ;;
 		esac
 	done
 	return 1
@@ -808,16 +815,12 @@ prepare_metafiles() {
 	mkdir -p "$controldir"
 	local builddate=$(date -u "+%s")
 	local size=$(du -sk | awk '{print $1 * 1024}')
-	local parch="$CARCH"
-
-	# we need to wait with setting noarch til our build infra can handle it
-#	if [ "$arch" = "noarch" ]; then
-#		parch="noarch"
-#	fi
 
-	# save arch incase subpackages set it different than main pkg
-	if [ "${apkbuild_arch:-$arch}" != "$arch" ]; then
-		echo "$arch" > "$controldir"/.arch
+	if [ "$arch" != "$apkbuild_arch" ]; then
+		local msg="Split function set arch=\"$arch\" for $name, use subpackages=pkg:split:arch format instead"
+		[ "$arch" != "noarch" ] && die "$msg"
+		warning "$msg"
+		subpkgarch="$arch"
 	fi
 
 	echo "# Generated by $(basename $0) $program_version" >"$pkginfo"
@@ -833,7 +836,7 @@ url = $url
 builddate = $builddate
 packager = ${PACKAGER:-"Unknown"}
 size = $size
-arch = $parch
+arch = ${subpkgarch:-$pkgarch}
 origin = $pkgname
 EOF
 	local i deps
@@ -904,7 +907,7 @@ EOF
 prepare_trace_rpaths() {
 	local dir=${subpkgdir:-$pkgdir}
 	local etype= soname= file= sover=
-	[ "$arch" = "noarch" ] && return 0
+	[ "${subpkgarch:-$pkgarch}" = "noarch" ] && return 0
 	options_has "!tracedeps" && return 0
 	# lets tell all the places we should look for .so files - all rpaths
 	scanelf --quiet --recursive --rpath "$dir" \
@@ -974,10 +977,10 @@ is_doc_pkg() {
 archcheck() {
 	options_has "!archcheck" && return 0
 	if dir_has_arch_binaries "${subpkgdir:-$pkgdir}"; then
-		[ "$arch" != "noarch" ] && return 0
+		[ "${subpkgarch:-$pkgarch}" != "noarch" ] && return 0
 		error "Arch specific binaries found so arch must not be set to \"noarch\""
 		return 1
-	elif [ "$arch" != "noarch" ] && ! is_dev_pkg; then
+	elif [ "${subpkgarch:-$pkgarch}" != "noarch" ] && ! is_dev_pkg; then
 		# we dont want -dev package go to noarch
 		warning "No arch specific binaries found so arch should probably be set to \"noarch\""
 	fi
@@ -1042,6 +1045,7 @@ trace_apk_deps() {
 	local name="$1"
 	local dir="$2"
 	local i= found= autodeps= deppkgs= missing=
+
 	msg "Tracing dependencies..."
 	# add pkgconfig if usr/lib/pkgconfig is found
 	if [ -d "$pkgbasedir"/$name/usr/lib/pkgconfig ] \
@@ -1153,7 +1157,7 @@ scan_shared_objects() {
 	local name="$1" controldir="$2" datadir="$3"
 	local opt= i=
 
-	if [ "$arch" = "noarch" ] && ! [ -e "$controldir"/.arch ]; then
+	if [ "${subpkgarch:-$pkgarch}" = "noarch" ]; then
 		return 0
 	fi
 
@@ -1430,7 +1434,6 @@ update_abuildrepo_index() {
 default_doc() {
 	depends="$depends_doc"
 	pkgdesc="$pkgdesc (documentation)"
-	arch=${arch_doc:-"noarch"}
 	install_if="docs $pkgname=$pkgver-r$pkgrel"
 
 	local i
@@ -1927,7 +1930,7 @@ checksum() {
 
 stripbin() {
 	local bin
-	if options_has "!strip" || [ "$arch" = "noarch" ]; then
+	if options_has "!strip" || [ "${subpkgarch:-$pkgarch}" = "noarch" ]; then
 		return 0
 	fi
 	cd "${subpkgdir:-$pkgdir}" || return 1
@@ -2271,7 +2274,12 @@ if [ -n "$subpkgname" ]; then
 	origsubpackages="$subpackages"
 	subpackages=
 fi
+apkbuild_arch="$arch"
 pkgdir="$pkgbasedir/$pkgname"
+if [ -z "$pkgarch" ]; then
+	pkgarch=$CARCH
+	list_has noarch $arch && pkgarch=noarch
+fi
 controldir="$pkgbasedir"/.control.${subpkgname:-$pkgname}
 
 trap 'die "Aborted by user"' INT