rpi-base: split into rpi, rpi2, rpi3

Until now, rpi-base served rpi0/rpi1 + rpi2 + rpi3 all at once.  The
variants were solely distiguished by the target architecture; it was
nice while it lasted, but now that rpi4 is on its way, we need to split
things up a little.

With the split,
* rpi-base depends on rpi-kernel, armv6l* only,
* rpi2-base depends on rpi2-kernel, armv7l* only
* rpi3-base depends on rpi3-kernel, aarch64* only,

To help migrate existing devices to the new base packages, rpi-base
will be an empty mega package for !armv6l* and depend on rpi2-base or
rpi3-base for the foreseeable future, thus resolving like this:
* rpi-base -> rpi2-base (armv7l*)
* rpi-base -> rpi3-base (aarch64*)

For now it's sufficient to have one package provide all subpackages, to
ease maintainance. The template can easiliy be split (as we did with
rpi-kernel) should the need arise some day.

rpi3-base actually existed back in 2017 (it depended on mainline kernel
instead of rpi-kernel) and became obsolete in 2018;
who would have known back then we may have to deal with rpi>3 some day...

Relates to: #29139

Acked-by: Duncaen <duncaen@voidlinux.org>

srcpkgs/rpi-base/template

@@ -1,9 +1,10 @@
 # Template file for 'rpi-base'
 pkgname=rpi-base
-version=2.6
+version=3.0
 revision=1
 archs="armv6l* armv7l* aarch64*"
-depends="virtual?ntp-daemon rpi-firmware rpi-kernel"
+_base_depends="virtual?ntp-daemon rpi-firmware"
+depends="${_base_depends} rpi-kernel"
 short_desc="Void Linux Raspberry Pi base files"
 maintainer="Orphaned <orphan@voidlinux.org>"
 license="Public Domain"
@@ -12,3 +13,49 @@ homepage="https://www.voidlinux.org"
 do_install() {
 	vinstall "${FILESDIR}/71-raspberrypi.rules" 644 usr/lib/udev/rules.d
 }
+
+case "$XBPS_TARGET_MACHINE" in
+	armv6*)
+		subpackages=" "
+		;;
+	armv7*)
+		subpackages="rpi2-base"
+		;;
+	aarch64*)
+		subpackages="rpi3-base"
+		;;
+esac
+
+# support legacy systems (before rpi-kernel was split to rpi{,2,3})
+# archs != armv6* are emtpy meta packages to pull the new rpi${n}-base package
+case "$XBPS_TARGET_MACHINE" in
+	armv6*) : ;;
+	*)
+		build_style=meta
+		short_desc+=" (transitional dummy package)"
+
+	 	do_install() { : ; }
+
+		case "$XBPS_TARGET_MACHINE" in
+			armv7*) depends="rpi2-base" ;;
+			aarch64*) depends="rpi3-base" ;;
+		esac
+		;;
+esac
+
+rpi2-base_package() {
+	depends="${_base_depends} rpi2-kernel"
+	short_desc="Void Linux Raspberry Pi 2 base files"
+	pkg_install() {
+		vinstall "${FILESDIR}/71-raspberrypi.rules" 644 usr/lib/udev/rules.d
+	}
+}
+
+
+rpi3-base_package() {
+	depends="${_base_depends} rpi3-kernel"
+	short_desc="Void Linux Raspberry Pi 3 base files"
+	pkg_install() {
+		vinstall "${FILESDIR}/71-raspberrypi.rules" 644 usr/lib/udev/rules.d
+	}
+}

srcpkgs/rpi2-base

@@ -0,0 +1 @@
+rpi-base

srcpkgs/rpi3-base

@@ -0,0 +1 @@
+rpi-base