archlinux: support for new packaging in legacy builder

Makefile.builder

@@ -1,3 +1,16 @@
 RPM_SPEC_FILES := rpm_spec/qubes-utils.spec rpm_spec/qubes-kernel-vm-support.spec
 ARCH_BUILD_DIRS := archlinux
 DEBIAN_BUILD_DIRS := debian
+
+# Support for new packaging
+ifneq ($(filter $(DISTRIBUTION), archlinux),)
+VERSION := $(file <$(ORIG_SRC)/$(DIST_SRC)/version)
+GIT_TARBALL_NAME ?= qubes-vm-utils-$(VERSION)-1.tar.gz
+SOURCE_COPY_IN := source-archlinux-copy-in
+
+source-archlinux-copy-in: PKGBUILD = $(CHROOT_DIR)/$(DIST_SRC)/$(ARCH_BUILD_DIRS)/PKGBUILD
+source-archlinux-copy-in:
+	cp $(PKGBUILD).in $(CHROOT_DIR)/$(DIST_SRC)/PKGBUILD
+	sed -i "s/@VERSION@/$(VERSION)/g" $(CHROOT_DIR)/$(DIST_SRC)/PKGBUILD
+	sed -i "s/@REL@/1/g" $(CHROOT_DIR)/$(DIST_SRC)/PKGBUILD
+endif