Add an initial mkosi config

This is still a work-in-progress.

It still needs:
 - A stubbed out Wireserver and IMDS instance

To try it out as-is, you can build and then boot the image with:

$ mkosi -d fedora
$ sudo mkosi boot

The version of azure-init in target/debug/ will be run as part of the
image startup. You can inspect the result with "systemctl status
azure-init". Run "systemctl poweroff" to leave the environment.

This needs to be done in an Azure VM since it relies on talking to a
real Wireserver and IMDS.

Refer to mkosi docs[0] for installation options

[0] https://github.com/systemd/mkosi?tab=readme-ov-file#installation

Author: jeremycline

.gitignore

@@ -15,3 +15,7 @@ Cargo.lock
 
 # .tgz Files are used for creating the image and are auto generated by the script
 azure-init.tgz
+
+# Don't check in local tweaks to the mkosi configuration
+mkosi.local.conf
+.mkosi/

mkosi.conf

@@ -0,0 +1,43 @@
+# A basic configuration to test azure-init
+#
+# Currently, this only works when used from an Azure VM since it relies on the
+# Azure-provided IMDS and Wireserver instances. In the future we can provide stubs
+# so it's easy to test locally or in GitHub actions. We can also add configurations
+# for additional distributions.
+#
+# To use this:
+#	- Install mkosi
+#	- Run `mkosi -d fedora` or `mkosi -d debian`
+#	- Run `sudo mkosi -d fedora boot`
+#
+# The repository is available under /work
+[Output]
+BuildDirectory=.mkosi/builddir
+CacheDirectory=.mkosi/cache
+Format=directory
+
+[Content]
+Autologin=yes
+
+Packages=
+	curl
+	gdb
+	sudo
+	systemd
+	util-linux
+
+[Host]
+# Build an image with `genisoimage -udf -o target/image.iso ovf` where ovf is a
+# directory with a valid `ovf-env.xml` file in it. Then uncomment below to add
+# the ISO as a CD-ROM in the virtual machine.
+#
+# This only works with a bootable image.
+#QemuArgs=-cdrom target/image.iso
+
+# Boot to a temporary snapshot of the image - changes won't be persisted to the
+# image.
+Ephemeral=true
+# Perform an incremental rebuild of the image
+Incremental=true
+# Make the source available at runtime
+RuntimeBuildSources=yes

mkosi.conf.d/10-debian.conf

@@ -0,0 +1,14 @@
+[Match]
+Distribution=|debian
+
+[Output]
+OutputDirectory=.mkosi/debian-output
+
+[Content]
+Packages=
+	apt
+	dbus-broker
+	dbus-user-session
+	openssh-client
+	openssh-server
+	passwd

mkosi.conf.d/10-fedora.conf

@@ -0,0 +1,11 @@
+[Match]
+Distribution=|fedora
+
+[Output]
+OutputDirectory=.mkosi/fedora-output
+
+[Content]
+Packages=
+	dnf
+	openssh
+	shadow-utils

mkosi.postinst.chroot

@@ -0,0 +1,24 @@
+#!/bin/bash
+set -e
+
+SUDO_GROUP=$(grep -oP "^%\K\w+" /etc/sudoers)
+
+cat >/etc/systemd/system/azure-init.service <<EOF
+[Unit]
+Description=azure-init
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+Environment="AZURE_INIT_LOG=debug"
+Environment="AZURE_INIT_USER_GROUPS=${SUDO_GROUP}"
+ExecStart=/work/src/target/debug/azure-init
+
+[Install]
+WantedBy=default.target
+EOF
+
+cat >/usr/lib/systemd/system-preset/1-azure-init.preset <<EOF
+enable azure-init.service
+EOF