Use ignition as a systemd service

simple init.d ignition fails as systemd is needed to set up drivers,
etc.

Signed-off-by: Christian Goll <cgoll@suse.de>

overlays/wwinit/etc/systemd/system/ignition-ww4-disks.service

@@ -0,0 +1,32 @@
+[Unit]
+Description=Ignition warewulf (disks)
+Documentation=https://hpcng.github.io/warewulf
+ConditionPathExists=/warewulf/ignition.json
+ConditionPathExists=/usr/lib/dracut/modules.d/30ignition/ignition
+DefaultDependencies=false
+
+Before=ignition-ww4-mount.service
+
+# This stage runs between `basic.target` and `initrd-root-device.target`,
+# see https://www.freedesktop.org/software/systemd/man/bootup.html
+# Make sure to run before the file system checks, as sgdisk will trigger
+# udev events, potentially resulting in race conditions due to disappearing
+# devices.
+
+# Note that CL runs this before `local-fs-pre.target` to allow for configs that
+# completely wipe the rootfs. Though we're not there yet. But we still run
+# before `sysroot.mount` on principle.
+Before=initrd-root-device.target
+Before=sysroot.mount
+
+#OnFailure=emergency.target
+#OnFailureJobMode=isolate
+
+# This stage requires udevd to detect disk partitioning changes.
+Requires=systemd-udevd.service
+After=systemd-udevd.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/lib/dracut/modules.d/30ignition/ignition --platform=metal --stage=disks --config-cache /warewulf/ignition.json

overlays/wwinit/etc/systemd/system/ignition-ww4-mount.service

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+[Unit]
+Description=Ignition warewulf (mount)
+Documentation=https://hpcng.github.io/warewulf
+ConditionPathExists=/warewulf/ignition.json
+ConditionPathExists=/usr/lib/dracut/modules.d/30ignition/ignition
+DefaultDependencies=false
+Before=ignition-complete.target
+
+After=ignition-ww4-disks.service
+
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/lib/dracut/modules.d/30ignition/ignition --platform=metal --stage=mount --config-cache /warewulf/ignition.json
+ExecStop=/usr/lib/dracut/modules.d/30ignition/ignition --platform=metal --stage=umount --config-cache /warewulf/ignition.json

overlays/wwinit/etc/systemd/system/multi-user.target.wants/ignition-ww4-disks.service

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+/etc/systemd/system/ignition-ww4-disks.service

overlays/wwinit/etc/systemd/system/multi-user.target.wants/ignition-ww4-mount.service

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+/etc/systemd/system/ignition-ww4-mount.service

overlays/wwinit/warewulf/ignition.json.ww

@@ -0,0 +1 @@
+{{ IgnitionJson }}