From 31116110ff0090324a568ce2aba6519a860d66b3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Renaud=20M=C3=A9trich?= <rmetrich@redhat.com>
Date: Thu, 11 Jul 2019 10:50:40 +0200
Subject: [PATCH] rngd: new module running early during boot to help generating
 entropy when system's default entropy sources are poor (e.g. use of SSD disks
 or UEFI RNG not available)
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On systems with low entropy at boot, the boot can take up to several
hours, specially when NBDE is used (e.g. clevis) which makes use of
the random number generator.

Enabling rngd service at boot early, because dracut-initqueue runs,
enables to initialize the random number generator in a couple of seconds
instead of minutes or hours.

Signed-off-by: Renaud Métrich <rmetrich@redhat.com>
(cherry picked from commit adee5b97bc5418b6e357342bb3be20568668aa55)

Resolves: #1726617
---
 modules.d/06rngd/module-setup.sh | 39 +++++++++++++++++++++++++++++++++++++++
 modules.d/06rngd/rngd.service    |  7 +++++++
 2 files changed, 46 insertions(+)

diff --git a/modules.d/06rngd/module-setup.sh b/modules.d/06rngd/module-setup.sh
new file mode 100644
index 00000000..43d5c2d3
--- /dev/null
+++ b/modules.d/06rngd/module-setup.sh
@@ -0,0 +1,39 @@
+#!/bin/bash
+# vim: set tabstop=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80:
+#
+# Copyright (c) 2019 Red Hat, Inc.
+# Author: Renaud Métrich <rmetrich@redhat.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+depends() {
+    echo systemd
+    return 0
+}
+
+check() {
+    # if there's no rngd binary, no go.
+    require_binaries rngd || return 1
+
+    return 0
+}
+
+install() {
+    inst rngd
+    inst_simple "${moddir}/rngd.service" "${systemdsystemunitdir}/rngd.service"
+    mkdir -p "${initdir}${systemdsystemunitdir}/sysinit.target.wants"
+    ln -rfs "${initdir}${systemdsystemunitdir}/rngd.service" \
+        "${initdir}${systemdsystemunitdir}/sysinit.target.wants/rngd.service"
+}
diff --git a/modules.d/06rngd/rngd.service b/modules.d/06rngd/rngd.service
new file mode 100644
index 00000000..570fbedb
--- /dev/null
+++ b/modules.d/06rngd/rngd.service
@@ -0,0 +1,7 @@
+[Unit]
+Description=Hardware RNG Entropy Gatherer Daemon
+DefaultDependencies=no
+Before=systemd-udevd.service
+
+[Service]
+ExecStart=/usr/sbin/rngd -f