[OE-core] [OE-Core][warrior][PATCH] rng-tools: start rngd early in the boot process again

[Fabio Berton]

From: "Bedel, Alban" <alban.bedel at aerq.com>

It do make sense to start rngd early in the boot process because
otherwise we would need to track every service that might need entropy
and explicitly configure it to start after rngd.

When used with systemd rngd blocked the shutdown process because it
simply missed the proper unit configuration. As the systemd
documentation explains, when using DefaultDependencies=no one also
have to explicitly configure the unit to properly stop at some point.
This is normaly achieved by having Before=shutdown.target and
Conflicts=shutdown.target set for the unit.

To have rngd started early again we reverte the changes done to
rngd.service in commit edf7606822 (rng-tools: fix rngd blocks system
shutdown). To have it properly stopped on shutdown we also add
Before=shutdown.target and Conflicts=shutdown.target.

Signed-off-by: Alban Bedel <alban.bedel at aerq.com>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
(cherry picked from commit a74e7df33e2c8ab2152e3217c0a5df3f65971713)
---
 meta/recipes-support/rng-tools/rng-tools/rngd.service | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/meta/recipes-support/rng-tools/rng-tools/rngd.service b/meta/recipes-support/rng-tools/rng-tools/rngd.service
index f0355db14fc..5c8253b5fba 100644
--- a/meta/recipes-support/rng-tools/rng-tools/rngd.service
+++ b/meta/recipes-support/rng-tools/rng-tools/rngd.service
@@ -2,7 +2,8 @@
 Description=Hardware RNG Entropy Gatherer Daemon
 DefaultDependencies=no
 After=systemd-udev-settle.service
-Before=sysinit.target
+Before=sysinit.target shutdown.target
+Conflicts=shutdown.target
 
 [Service]
 ExecStart=@SBINDIR@/rngd -f -r /dev/hwrng
-- 
2.20.1