networkd-test: add mkosi snippet for building and running networkd-tets.py in a network namespaced container

This provides us with an easy command line to test this script. Because
the test was so difficult to get running noone ever did, hence it broke
badly quickly. Let's fix that.

test/mkosi.build.networkd-test

@@ -0,0 +1,24 @@
+#!/bin/sh
+set -ex
+
+# First, source in the main build script
+. "$SRCDIR"/mkosi.build
+
+mkdir -p "$DESTDIR"/usr/local/bin
+cp "$SRCDIR"/test/networkd-test.py "$DESTDIR"/usr/local/bin/networkd-test.py
+
+mkdir -p "$DESTDIR"/etc/systemd/system
+cat > "$DESTDIR"/etc/systemd/system/networkd-test.service <<EOF
+[Unit]
+Description=networkd test service
+SuccessAction=exit
+FailureAction=exit
+
+[Service]
+ExecStart=/usr/local/bin/networkd-test.py
+EOF
+
+mkdir -p "$DESTDIR"/etc/systemd/system/multi-user.target.wants/
+ln -s ../networkd-test.service "$DESTDIR"/etc/systemd/system/multi-user.target.wants/
+
+systemctl --root="$DESTDIR" disable systemd-networkd.service

test/mkosi.default.networkd-test

@@ -0,0 +1,80 @@
+# Puts together an nspawn container and runs networkd-test.py in it, inside a
+# network namespace and everything. Run this with "mkosi
+# --default=mkosi.default.networkd-test boot". This will start the test and
+# eventually exit with sucess in case the test succeeded.
+
+[Distribution]
+Distribution=fedora
+Release=29
+
+[Output]
+Format=raw_btrfs
+Bootable=yes
+KernelCommandLine=printk.devkmsg=on
+OutputDirectory=../mkosi.output
+Output=networkd-test.raw
+
+[Partitions]
+RootSize=3G
+
+[Packages]
+BuildPackages=
+        audit-libs-devel
+        bzip2-devel
+        cryptsetup-devel
+        dbus-devel
+        diffutils
+        docbook-style-xsl
+        elfutils-devel
+        gcc
+        gettext
+        git
+        gnu-efi
+        gnu-efi-devel
+        gnutls-devel
+        gperf
+        hostname
+        iptables-devel
+        kmod-devel
+        libacl-devel
+        libblkid-devel
+        libcap-devel
+        libcurl-devel
+        libgcrypt-devel
+        libidn2-devel
+        libmicrohttpd-devel
+        libmount-devel
+        libseccomp-devel
+        libselinux-devel
+        libtool
+        libxkbcommon-devel
+        libxslt
+        lz4
+        lz4-devel
+        m4
+        meson
+        pam-devel
+        pcre2-devel
+        pkgconfig
+        python3-devel
+        python3-lxml
+        qrencode-devel
+        tree
+        xz-devel
+
+Packages=
+        dnsmasq
+        iproute
+        libidn2
+        polkit
+        python3
+
+# Share caches with the top-level mkosi
+BuildDirectory=../mkosi.builddir
+Cache=../mkosi.cache
+
+# Run our own script
+BuildScript=mkosi.build.networkd-test
+
+BuildSources=..
+NSpawnSettings=mkosi.nspawn.networkd-test

test/mkosi.nspawn.networkd-test

@@ -0,0 +1,2 @@
+[Network]
+Private=yes