New warewulf-dracut subpackage

warewulf-dracut includes a dracut module to be installed in a container
image to support building an initramfs that can boot from Warewulf.

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

dracut/modules.d/90wwinit/load-wwinit.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+info "Mounting tmpfs at $NEWROOT"
+mount -t tmpfs ${wwinit_tmpfs_size_option} tmpfs "$NEWROOT"
+
+for archive in "${wwinit_container}" "${wwinit_kmods}" "${wwinit_system}" "${wwinit_runtime}"
+do
+    if [ -n "${archive}" ]
+    then
+        info "Loading ${archive}"
+        (curl --silent -L "${archive}" | gzip -d | cpio -im --directory="${NEWROOT}") || die "Unable to load ${archive}"
+    fi
+done

dracut/modules.d/90wwinit/module-setup.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+check() {
+    # Don't include in hostonly mode
+    [[ $hostonly ]] && return 1
+
+    # Don't include by default
+    return 255
+}
+
+depends() {
+    echo network
+    return 0
+}
+
+install() {
+    inst_multiple cpio curl
+    inst_hook cmdline 30 "$moddir/parse-wwinit.sh"
+    inst_hook pre-mount 30 "$moddir/load-wwinit.sh"
+}

dracut/modules.d/90wwinit/parse-wwinit.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+# root=wwinit
+
+[ -z "$root" ] && root=$(getarg root=)
+
+if [ "${root}" = "wwinit" ]
+then
+    info "root=${root}"
+    export wwinit_container=$(getarg wwinit.container=); info "wwinit.container=${wwinit_container}"
+    export wwinit_system=$(getarg wwinit.system=); info "wwinit.system=${wwinit_system}"
+    export wwinit_runtime=$(getarg wwinit.runtime=); info "wwinit.runtime=${wwinit_runtime}"
+    export wwinit_kmods=$(getarg wwinit.kmods=); info "wwinit.kmods=${wwinit_kmods}"
+
+    wwinit_tmpfs_size=$(getarg wwinit.tmpfs.size=)
+    if [ -n "$wwinit_tmpfs_size" ]
+    then
+        info "wwinit.tmpfs.size=${wwinit_tmpfs_size}"
+        export wwinit_tmpfs_size_option="-o size=${wwinit_tmpfs_size}"
+    fi
+
+    if [ -n "${wwinit_container}" ]
+    then
+        info "Found root=${root} and a Warewulf container image. Will boot from Warewulf."
+        rootok=1
+    else
+        die "Found root=${root} but no container image. Cannot boot from Warewulf."
+    fi
+fi