feat(systemd-hostnamed): introducing the systemd-hostnamed module

Introducing the systemd-hostnamed module.

dracut.spec

@@ -325,6 +325,7 @@ echo 'dracut_rescue_image="yes"' > $RPM_BUILD_ROOT%{dracutlibdir}/dracut.conf.d/
 %{dracutlibdir}/modules.d/01systemd-ac-power
 %{dracutlibdir}/modules.d/01systemd-ask-password
 %{dracutlibdir}/modules.d/01systemd-coredump
+%{dracutlibdir}/modules.d/01systemd-hostnamed
 %{dracutlibdir}/modules.d/01systemd-initrd
 %{dracutlibdir}/modules.d/01systemd-modules-load
 %{dracutlibdir}/modules.d/01systemd-repart

modules.d/01systemd-hostnamed/99-systemd-networkd-dracut.conf

@@ -0,0 +1,6 @@
+# This file is part of dracut systemd-hostnamed module.
+
+[Service]
+User=systemd-network
+Group=systemd-hostname
+AmbientCapabilities=CAP_SYS_ADMIN

modules.d/01systemd-hostnamed/module-setup.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+# This file is part of dracut.
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# Prerequisite check(s) for module.
+check() {
+
+    # If the binary(s) requirements are not fulfilled the module can't be installed
+    require_binaries hostnamectl || return 1
+    require_binaries "$systemdutildir"/systemd-hostnamed || return 1
+
+    # Return 255 to only include the module, if another module requires it.
+    return 255
+
+}
+
+# Module dependency requirements.
+depends() {
+
+    # This module has external dependency on other module(s).
+    echo dbus systemd-sysusers
+    # Return 0 to include the dependent module(s) in the initramfs.
+    return 0
+
+}
+
+# Install the required file(s) and directories for the module in the initramfs.
+install() {
+
+    inst_simple "$moddir/systemd-hostname-dracut.conf" "$sysusers/systemd-hostname-dracut.conf"
+    inst_simple "$moddir/org.freedesktop.hostname1_dracut.conf" "$dbussystem/org.freedesktop.hostname1_dracut.conf"
+    inst_simple "$moddir/99-systemd-networkd-dracut.conf" "$systemdsystemunitdir/systemd-hostnamed.service.d/99-systemd-networkd-dracut.conf"
+
+    inst_multiple -o \
+        "$dbussystem"/org.freedesktop.hostname1.conf \
+        "$dbussystemservices"/org.freedesktop.hostname1.service \
+        "$systemdutildir"/systemd-hostnamed \
+        "$systemdsystemunitdir"/systemd-hostnamed.service \
+        "$systemdsystemunitdir/systemd-hostnamed.service.d/*.conf" \
+        hostnamectl
+
+    # Install the hosts local user configurations if enabled.
+    if [[ $hostonly ]]; then
+        inst_multiple -H -o \
+            /etc/hostname \
+            "$systemdsystemconfdir"/systemd-hostnamed.service \
+            "$systemdsystemconfdir"/systemd-hostnamed.service.d/*.conf"
+    fi
+}

modules.d/01systemd-hostnamed/org.freedesktop.hostname1_dracut.conf

@@ -0,0 +1,19 @@
+<?xml version="1.0"?> <!--*-nxml-*-->
+<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
+        "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
+
+<!--
+
+  This file is part of dracut systemd-hostnamed module.
+
+-->
+
+<busconfig>
+
+        <policy group="systemd-hostname">
+                <allow own="org.freedesktop.hostname1"/>
+                <allow send_destination="org.freedesktop.hostname1"/>
+                <allow receive_sender="org.freedesktop.hostname1"/>
+        </policy>
+
+</busconfig>

modules.d/01systemd-hostnamed/systemd-hostname-dracut.conf

@@ -0,0 +1,2 @@
+# This file is part of dracut systemd-hostnamed module.
+g systemd-hostname - "systemd hostname"