plymouth: switch to KillMode=mixed

KillMode=none is deprecated, so we need to stop using it [1].

For now, use `KillMode=mixed` and `IgnoreOnIsolate=true` instead.

In the future, we should change plymouth to be able to exit and
start again without restarting the active animation, but that's
going to require some effort.

[1] https://gitlab.freedesktop.org/plymouth/plymouth/-/issues/123

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-core/plymouth/files/0001-systemd-switch-to-KillMode-mixed.patch

@@ -0,0 +1,43 @@
+From 9d0f8b2e7bc2d1d2b0900fcdf119bb9a2cc4f474 Mon Sep 17 00:00:00 2001
+From: Ray Strode <rstrode@redhat.com>
+Date: Tue, 25 Aug 2020 10:49:11 -0400
+Subject: [PATCH] systemd: switch to KillMode=mixed
+
+KillMode=none is deprecated, so we need to stop using it.
+
+For now, use `KillMode=mixed` and `IgnoreOnIsolate=true` instead.
+
+In the future, we should change plymouth to be able to exit and
+start again without restarting the active animation, but that's
+going to require some effort.
+
+https://gitlab.freedesktop.org/plymouth/plymouth/-/issues/123
+
+Upstream-Status: Backport [https://gitlab.freedesktop.org/plymouth/plymouth/-/commit/9d0f8b2e7bc2d1d2b0900fcdf119bb9a2cc4f474]
+
+Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
+---
+ systemd-units/plymouth-start.service.in | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/systemd-units/plymouth-start.service.in b/systemd-units/plymouth-start.service.in
+index 3d00cc6..830a62d 100644
+--- a/systemd-units/plymouth-start.service.in
++++ b/systemd-units/plymouth-start.service.in
+@@ -6,11 +6,12 @@ After=systemd-vconsole-setup.service systemd-udev-trigger.service systemd-udevd.
+ Before=systemd-ask-password-plymouth.service
+ ConditionKernelCommandLine=!plymouth.enable=0
+ ConditionVirtualization=!container
++IgnoreOnIsolate=true
+ 
+ [Service]
+ ExecStart=@PLYMOUTH_DAEMON_DIR@/plymouthd --mode=boot --pid-file=@plymouthruntimedir@/pid --attach-to-session
+ ExecStartPost=-@PLYMOUTH_CLIENT_DIR@/plymouth show-splash
+ Type=forking
+ RemainAfterExit=yes
+-KillMode=none
++KillMode=mixed
+ SendSIGKILL=no
+-- 
+2.17.1
+

meta-oe/recipes-core/plymouth/plymouth_0.9.5.bb

@@ -20,6 +20,7 @@ RPROVIDES_${PN} = "virtual-psplash virtual-psplash-support"
 SRC_URI = " \
     http://www.freedesktop.org/software/plymouth/releases/${BPN}-${PV}.tar.xz \
     file://0001-Make-full-path-to-systemd-tty-ask-password-agent-con.patch \
+    file://0001-systemd-switch-to-KillMode-mixed.patch \
         "
 
 SRC_URI[md5sum] = "8a25d23f3ae732af300a56fa33cacff2"