devicepkg-dev kernel prepare function

See merge request postmarketOS/pmbootstrap!1570

aports/main/devicepkg-dev/APKBUILD

@@ -1,5 +1,5 @@
 pkgname="devicepkg-dev"
-pkgver=0.2
+pkgver=0.3
 pkgrel=0
 pkgdesc="Provides default device package functions"
 url="https://postmarketos.org"
@@ -8,6 +8,7 @@ license="MIT"
 source="
 	devicepkg_build.sh
 	devicepkg_package.sh
+	downstreamkernel_prepare.sh
 "
 
 package() {
@@ -15,6 +16,9 @@ package() {
 		"$pkgdir/usr/bin/devicepkg_build"
 	install -Dm755 "$srcdir/devicepkg_package.sh" \
 		"$pkgdir/usr/bin/devicepkg_package"
+	install -Dm755 "$srcdir/downstreamkernel_prepare.sh" \
+		"$pkgdir/usr/bin/downstreamkernel_prepare"
 }
 sha512sums="638d50e6388eabf0da6bf0cff2fe9719ad8a808946f0077228db57fa13a26d9eeb39c1f2689c9a6f93ff9b3bcfdcfb7c358b180bba90e5bba8b9a9e78d25ed18  devicepkg_build.sh
-c732792596f56860f6ab9ddd53b9a7a80224400dd20097b20cebe17a6e7330e9178783f09db16132a28a555f83e29ef3643bfe069638b62998912a9a7ffefdc0  devicepkg_package.sh"
+c732792596f56860f6ab9ddd53b9a7a80224400dd20097b20cebe17a6e7330e9178783f09db16132a28a555f83e29ef3643bfe069638b62998912a9a7ffefdc0  devicepkg_package.sh
+9f240217084215e6a085616ae7dbe4ed7446f9cd4a1ca32631c083a1c74ea380bb8585a32a506491e54db091683bbe7300e94dba3a0d994a580017686386abc8  downstreamkernel_prepare.sh"

aports/main/devicepkg-dev/downstreamkernel_prepare.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+srcdir=$1
+builddir=$2
+_config=$3
+_carch=$4
+HOSTCC=$5
+
+if [ -z "$srcdir" ] || [ -z "$builddir" ] || [ -z "$_config" ] ||
+	[ -z "$_carch" ] || [ -z "$HOSTCC" ]; then
+	echo "ERROR: missing argument!"
+	echo "Please call downstreamkernel_prepare() with \$srcdir, \$builddir,"
+	echo "\$_config, \$_carch and \$HOSTCC as arguments."
+	exit 1
+fi
+
+# gcc6 support
+cp -v "$srcdir/compiler-gcc6.h" "$builddir/include/linux/"
+
+# Remove -Werror from all makefiles
+makefiles="$(find . -type f -name Makefile)
+	$(find . -type f -name Kbuild)"
+for i in $makefiles; do
+	sed -i 's/-Werror-/-W/g' "$i"
+	sed -i 's/-Werror//g' "$i"
+done
+
+# Prepare kernel config ('yes ""' for kernels lacking olddefconfig)
+cp "$srcdir/$_config" "$builddir"/.config
+yes "" | make ARCH="$_carch" HOSTCC="$HOSTCC" oldconfig

pmb/aportgen/linux.py

@@ -26,7 +26,7 @@ def generate_apkbuild(args, pkgname, deviceinfo):
     device = "-".join(pkgname.split("-")[1:])
     carch = pmb.parse.arch.alpine_to_kernel(deviceinfo["arch"])
 
-    makedepends = "perl sed installkernel bash gmp-dev bc linux-headers elfutils-dev"
+    makedepends = "perl sed installkernel bash gmp-dev bc linux-headers elfutils-dev devicepkg-dev"
 
     package = """
             # kernel.release
@@ -96,22 +96,7 @@ def generate_apkbuild(args, pkgname, deviceinfo):
 
         prepare() {
             default_prepare
-
-            # gcc6 support
-            cp -v "$srcdir/compiler-gcc6.h" "$builddir/include/linux/"
-
-            # Remove -Werror from all makefiles
-            local i
-            local makefiles="$(find . -type f -name Makefile)
-                $(find . -type f -name Kbuild)"
-            for i in $makefiles; do
-                sed -i 's/-Werror-/-W/g' "$i"
-                sed -i 's/-Werror//g' "$i"
-            done
-
-            # Prepare kernel config ('yes ""' for kernels lacking olddefconfig)
-            cp "$srcdir"/$_config "$builddir"/.config
-            yes "" | make ARCH="$_carch" HOSTCC="$HOSTCC" oldconfig
+            downstreamkernel_prepare "$srcdir" "$builddir" "$_config" "$_carch" "$HOSTCC"
         }
 
         build() {""" + build + """