build: add mkosi hooks

Right now there's support for building on Archlinux only.

Makefile.am

@@ -498,3 +498,11 @@ tar: kmod-$(VERSION).tar.xz kmod-$(VERSION).tar.sign
 
 tar-sync: kmod-$(VERSION).tar.xz kmod-$(VERSION).tar.sign
 	kup put kmod-$(VERSION).tar.xz  kmod-$(VERSION).tar.sign /pub/linux/utils/kernel/kmod/
+
+# ------------------------------------------------------------------------------
+# mkosi
+# ------------------------------------------------------------------------------
+
+mkosi:
+	-mkdir $(top_srcdir)/testsuite/mkosi/mkosi.cache
+	mkosi -C $(top_srcdir)/testsuite/mkosi --build-sources ../../ -fi

testsuite/mkosi/.gitignore

@@ -0,0 +1,4 @@
+/image.raw*
+/.mkosi-*
+/mkosi.cache
+/rootfs

testsuite/mkosi/mkosi.arch

@@ -0,0 +1,22 @@
+[Distribution]
+Distribution=arch
+Release=(rolling)
+
+[Packages]
+Packages = valgrind
+BuildPackages =
+	automake
+	gcc
+	git
+	make
+	pkg-config
+	python2
+	python2-future
+	autoconf
+	gtk-doc
+	docbook-xml
+	docbook-xsl
+	linux-headers
+
+[Partitions]
+RootSize = 4G

testsuite/mkosi/mkosi.build

@@ -0,0 +1,23 @@
+#!/bin/bash -ex
+
+if [ -f configure ]; then
+    make distclean
+fi
+
+rm -rf build
+mkdir build
+cd build
+
+kdirs=(/usr/lib/modules/*/build/Makefile)
+if [[ ! -f ${kdirs[0]} ]]; then
+  printf '==> Unable to find kernel headers to build modules for tests\n' >&2
+  return 1
+fi
+
+kdir=${kdirs[0]%/Makefile}
+IFS=/ read _ _ _ kver _ <<<"$kdir"
+
+../autogen.sh c
+make -j
+make check KDIR="$kdir" KVER="$kver"
+make install

testsuite/mkosi/mkosi.default

@@ -0,0 +1 @@
+mkosi.arch