New, optional dracut.ipxe configuration

dracut.ipxe boots an initramfs detected in the container image. This
required a few small changes to warewulfd and the wwinit overlay to
accommodate the dracut initramfs configuring the network interface
before wwinit:

- Include .NetDevs in the ipxe configuration template, so that dracut
  can configure interfaces with the correct names.

- Configure NetworkManager to not keep the initramfs configuration, in
  stead applying the configuration found by wwinit.

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

CHANGELOG.md

@@ -40,11 +40,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Add examples for building overlays in parallel to documentation
 - Add `stage=initramfs` to warewulfd provision to serve initramfs from container image. #1115
 - Add `warewulf-dracut` package to support building Warewulf-compatible initramfs images with dracut. #1115
+- Add iPXE template `dracut.ipxe` to boot a dracut initramfs. #1115
+- Add `.NetDevs` variable to iPXE templates, similar to overlay templates. #1115
 
 ### Changed
 
 - Replace reference to docusaurus with Sphinx
 - `wwctl container import` now only runs syncuser if explicitly requested. #1212
+- wwinit now configures NetworkManager to not retain configurations from dracut. #1115
 
 ### Fixed
 

etc/ipxe/dracut.ipxe

@@ -0,0 +1,46 @@
+#!ipxe
+
+echo
+echo ================================================================================
+echo Warewulf v4 now booting via dracut: {{.Fqdn}} ({{.Hwaddr}})
+echo
+echo Container:     {{.ContainerName}}
+{{if .KernelOverride }}
+echo Kernel:        {{.KernelOverride}}
+{{else}}
+echo Kernel:        {{.ContainerName}} (container default)
+{{end}}
+echo KernelArgs:    {{.KernelArgs}}
+echo
+
+set uri http://{{.Ipaddr}}:{{.Port}}/provision/{{.Hwaddr}}?assetkey=${asset}&uuid=${uuid}
+echo Warewulf Controller: {{.Ipaddr}}
+
+echo Downloading Kernel Image:
+kernel --name kernel ${uri}&stage=kernel || goto reboot
+
+{{if ne .KernelOverride ""}}
+echo Downloading Kernel Modules:
+imgextract --name kmods ${uri}&stage=kmods&compress=gz || initrd --name kmods ${uri}&stage=kmods || goto reboot
+set kernel_mods initrd=kmods
+{{end}}
+
+echo Downloading initramfs
+initrd --name initramfs ${uri}&stage=initramfs || goto reboot
+
+set dracut_net rd.neednet=1 {{range $devname, $netdev := .NetDevs}}{{if and $netdev.Hwaddr $netdev.Device}} ifname={{$netdev.Device}}:{{$netdev.Hwaddr}} {{end}}{{end}}
+set dracut_wwinit root=wwinit wwinit.container=${uri}&stage=container&compress=gz wwinit.system=${uri}&stage=system&compress=gz wwinit.runtime=${uri}&stage=runtime&compress=gz {{if ne .KernelOverride ""}}wwinit.kmods=${uri}&stage=kmods&compress=gz{{end}} init=/init
+
+echo Booting initramfs
+#echo Network KernelArgs: ${dracut_net}
+#echo Dracut wwinit KernelArgs: ${dracut_wwinit}
+#sleep 15
+boot kernel initrd=initramfs ${kernel_mods} ${dracut_net} ${dracut_wwinit} wwid={{.Hwaddr}} {{.KernelArgs}}
+
+
+:reboot
+echo
+echo There was an error, rebooting in 15s...
+echo
+sleep 15
+reboot

internal/pkg/warewulfd/provision.go

@@ -15,6 +15,7 @@ import (
 	warewulfconf "github.com/warewulf/warewulf/internal/pkg/config"
 	"github.com/warewulf/warewulf/internal/pkg/container"
 	"github.com/warewulf/warewulf/internal/pkg/kernel"
+	"github.com/warewulf/warewulf/internal/pkg/node"
 	"github.com/warewulf/warewulf/internal/pkg/overlay"
 	"github.com/warewulf/warewulf/internal/pkg/util"
 	"github.com/warewulf/warewulf/internal/pkg/wwlog"
@@ -33,6 +34,7 @@ type templateVars struct {
 	Port           string
 	KernelArgs     string
 	KernelOverride string
+	NetDevs        map[string]*node.NetDevs
 }
 
 func ProvisionSend(w http.ResponseWriter, req *http.Request) {
@@ -94,6 +96,7 @@ func ProvisionSend(w http.ResponseWriter, req *http.Request) {
 
 	} else if rinfo.stage == "ipxe" {
 		stage_file = path.Join(conf.Paths.Sysconfdir, "warewulf/ipxe/"+node.Ipxe.Get()+".ipxe")
+		tstruct := overlay.InitStruct(&node)
 		tmpl_data = templateVars{
 			Id:             node.Id.Get(),
 			Cluster:        node.ClusterName.Get(),
@@ -104,7 +107,8 @@ func ProvisionSend(w http.ResponseWriter, req *http.Request) {
 			Hwaddr:         rinfo.hwaddr,
 			ContainerName:  node.ContainerName.Get(),
 			KernelArgs:     node.Kernel.Args.Get(),
-			KernelOverride: node.Kernel.Override.Get()}
+			KernelOverride: node.Kernel.Override.Get(),
+			NetDevs:        tstruct.NetDevs}
 	} else if rinfo.stage == "kernel" {
 		if node.Kernel.Override.Defined() {
 			stage_file = kernel.KernelImage(node.Kernel.Override.Get())

overlays/wwinit/rootfs/etc/NetworkManager/conf.d/ww4-discard-configuration.conf

@@ -0,0 +1,2 @@
+[device]
+keep-configuration=no