rng-tools: include RNG daemon to image

The rngd reads from hardware random number generator device (/dev/hwrng)
and feeds that to /dev/random. Better entropy at boot time is now required
since Qt is using getentropy() for random numbers, which blocks on boot if
there is not enough generated entropy.

Unlike the upstream recipe, this one is configured to use /dev/hwrng
instead of /dev/urandom, which means the device needs to have a working
HWRNG configuration.

Task-number: QTBUG-63188
Change-Id: Icead7576572d7614de8468f1cceaf522dd45dc8d
Reviewed-by: Sami Nurmenniemi <sami.nurmenniemi@qt.io>

3 files changed, 55 insertions, 0 deletions

diff --git a/recipes/packagegroup/packagegroup-b2qt-embedded-base.bb b/recipes/packagegroup/packagegroup-b2qt-embedded-base.bb
index 65f7f5e..b6573e2 100644
--- a/recipes/packagegroup/packagegroup-b2qt-embedded-base.bb
+++ b/recipes/packagegroup/packagegroup-b2qt-embedded-base.bb
@@ -52,6 +52,7 @@ RDEPENDS_${PN} = "\
         tzdata-asia \
         tzdata-europe \
         connman \
+        rng-tools \
         ${@bb.utils.contains("DISTRO_FEATURES", "wayland", "weston weston-examples", "", d)} \
         ${MACHINE_EXTRA_INSTALL} \
         "
diff --git a/recipes/rng-tools/rng-tools/rngd.service b/recipes/rng-tools/rng-tools/rngd.service
new file mode 100644
index 0000000..22c7361
--- /dev/null
+++ b/recipes/rng-tools/rng-tools/rngd.service
@@ -0,0 +1,9 @@
+[Unit]
+Description=Hardware RNG Entropy Gatherer Daemon
+
+[Service]
+ExecStart=@SBINDIR@/rngd -f
+SuccessExitStatus=66
+
+[Install]
+WantedBy=multi-user.target
diff --git a/recipes/rng-tools/rng-tools_5.bbappend b/recipes/rng-tools/rng-tools_5.bbappend
new file mode 100644
index 0000000..dedddf0
--- /dev/null
+++ b/recipes/rng-tools/rng-tools_5.bbappend
@@ -0,0 +1,45 @@
+############################################################################
+##
+## Copyright (C) 2017 The Qt Company Ltd.
+## Contact: https://www.qt.io/licensing/
+##
+## This file is part of the Boot to Qt meta layer.
+##
+## $QT_BEGIN_LICENSE:GPL$
+## Commercial License Usage
+## Licensees holding valid commercial Qt licenses may use this file in
+## accordance with the commercial license agreement provided with the
+## Software or, alternatively, in accordance with the terms contained in
+## a written agreement between you and The Qt Company. For licensing terms
+## and conditions see https://www.qt.io/terms-conditions. For further
+## information use the contact form at https://www.qt.io/contact-us.
+##
+## GNU General Public License Usage
+## Alternatively, this file may be used under the terms of the GNU
+## General Public License version 3 or (at your option) any later version
+## approved by the KDE Free Qt Foundation. The licenses are as published by
+## the Free Software Foundation and appearing in the file LICENSE.GPL3
+## included in the packaging of this file. Please review the following
+## information to ensure the GNU General Public License requirements will
+## be met: https://www.gnu.org/licenses/gpl-3.0.html.
+##
+## $QT_END_LICENSE$
+##
+############################################################################
+
+FILESEXTRAPATHS_append := "${THISDIR}/${PN}:"
+SRC_URI += "\
+    file://rngd.service \
+    "
+
+inherit systemd
+
+do_install_append() {
+    if ${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'true', 'false', d)}; then
+        install -d ${D}${systemd_unitdir}/system
+        install -m 644 ${WORKDIR}/rngd.service ${D}${systemd_unitdir}/system
+        sed -i -e 's,@SBINDIR@,${sbindir},g' ${D}${systemd_unitdir}/system/rngd.service
+    fi
+}
+
+SYSTEMD_SERVICE_${PN} = "rngd.service"