Add support to different deviceinfo variables in mainline/downstream subpackages

main/devicepkg-dev/devicepkg_subpackage_kernel.sh

@@ -0,0 +1,41 @@
+#!/bin/sh
+startdir=$1
+pkgname=$2
+subpkgname=$3
+
+if [ -z "$startdir" ] || [ -z "$pkgname" ] || [ -z "$subpkgname" ]; then
+	echo "ERROR: missing argument!"
+	echo "Please call $0 with \$startdir \$pkgname \$subpkgname as arguments."
+	exit 1
+fi
+
+srcdir="$startdir/src"
+pkgdir="$startdir/pkg/$pkgname"
+subpkgdir="$startdir/pkg/$subpkgname"
+
+if [ -e "$pkgdir/etc/deviceinfo" ]; then
+	rm -v "$pkgdir/etc/deviceinfo"
+fi
+
+install -Dm644 "$srcdir/deviceinfo" \
+	"$subpkgdir/etc/deviceinfo"
+
+# Get the kernel type ("downstream", "mainline")
+kernel=$(echo "$subpkgname" | sed -n "s/.*-kernel-\(.*\)/\1/p")
+
+# Iterate over deviceinfo variables that have the kernel type as suffix
+# var looks like: deviceinfo_kernel_cmdline, ...
+grep -E "(.+)_$kernel=.*" "$subpkgdir/etc/deviceinfo" | \
+	sed "s/\(.\+\)_$kernel=.*/\1/g" | while IFS= read -r var
+do
+	if grep -Eq "$var=.*" "$subpkgdir/etc/deviceinfo"; then
+		echo "ERROR: variable '$var' should contain a kernel subpackage suffix"
+		exit 1
+	fi
+
+	# Remove the kernel suffix from the variable
+	sed -i "s/$var\_$kernel/$var/g" "$subpkgdir/etc/deviceinfo"
+
+	# Remove the variables with other kernel suffixes
+	sed -i "/$var\_.*=.*/d" "$subpkgdir/etc/deviceinfo"
+done