Prevent ignition from running twice in a provision-to-disk configuration

Ignition runs during provision-to-disk, and then also tries to run again during
sytsemd. This commit adds a sentinel file during the initial provision-to-disk
that is detected by systemd to prevent re-running ignition partitioning /
formatting.

- Fixes: #1981

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

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

@@ -3,10 +3,9 @@ Description=Ignition warewulf (disks)
 Documentation=https://warewulf.org/
 ConditionPathExists=/warewulf/ignition.json
 ConditionPathExists=/usr/lib/dracut/modules.d/30ignition/ignition
+ConditionPathExists=!/warewulf/run/.ignition-done
 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

overlays/ignition/rootfs/warewulf/wwinit.d/10-ignition.sh

@@ -17,7 +17,14 @@ fi
 
 if command -v ignition >/dev/null; then :
     info "warewulf: ignition: partition and format disks"
-    ignition --config-cache="${PREFIX}/warewulf/ignition.json" --platform=metal --stage=disks || die "warewulf: ignition: failed to partition/format disk"
+    if ignition --config-cache="${PREFIX}/warewulf/ignition.json" --platform=metal --stage=disks; then
+        # Create marker file to signal successful completion
+        # This prevents the systemd service from running ignition again after switch_root
+        mkdir -p "${PREFIX}/warewulf/run"
+        echo "ignition run by 10-ignition.sh" >"${PREFIX}/warewulf/run/.ignition-done"
+    else
+        die "warewulf: ignition: failed to partition/format disk"
+    fi
 else
     info "warewulf: ignition not found"
 fi