[Buildroot] psplash and systemd

[Eric Le Bihan]

Hi!

On Wed, May 21, 2014 at 10:36:15AM +0200, Tom Deblauwe wrote:
> Hello,
>
> I am using psplash in my initramfs and it shows up a graphical
> bootscreen, but then the regular bootprocess starts and there I would
> like to continue showing the splash screen. I am using the 6d3336a
> commit of master buildroot. So I would like to use systemd. What is the
> best solution for this?

Please find attached a patch that installs two new services for using psplash
with systemd. These are inspired by the ones from Plymouth
(http://cgit.freedesktop.org/plymouth/tree/systemd-units/):

- psplash-start.service for starting psplash.
- psplash-quit.service for killing psplash when reaching multi-user.target.

I tested them on QEMU machines:

- on QEMU/x86, the boot is very quick, so the boot screen is not displayed for
  a long time.
- on QEMU/ARM, the boot takes longer, so the screen can be seen.

Besides, no progress messages are printed when booting (I have not found how
to do it yet).

Thought these configurations do not use an initramfs followed by a
switch-root, these service files should provide you a good start.

Best regards,
ELB
-------------- next part --------------
>From c7044ddc654695ca00ce58a38c32b4a45dffb315 Mon Sep 17 00:00:00 2001
From: Eric Le Bihan <eric.le.bihan.dev at free.fr>
Date: Wed, 21 May 2014 19:08:41 +0200
Subject: [PATCH 1/1] psplash: install systemd services

This patch provides service files for using psplash on embedded devices
running systemd:

- psplash-start.service: start psplash.
- psplash-quit.service: kill psplash when reaching multi-user.target

The following kernel command line options should also be set:

  systemd.show_status=0 quiet splash

The option "systemd.show_status=0" is required, because, unlike Plymouth,
psplash does not have real systemd integration, i.e. it will not perform:

  kill(1, SIGRTMIN + 21);

Note that no progress messages will be printed on the splash screen.

Signed-off-by: Eric Le Bihan <eric.le.bihan.dev at free.fr>
---
 package/psplash/psplash-quit.service  | 11 +++++++++++
 package/psplash/psplash-start.service | 11 +++++++++++
 package/psplash/psplash.mk            | 14 ++++++++++++++
 3 files changed, 36 insertions(+)
 create mode 100644 package/psplash/psplash-quit.service
 create mode 100644 package/psplash/psplash-start.service

diff --git a/package/psplash/psplash-quit.service b/package/psplash/psplash-quit.service
new file mode 100644
index 0000000..14bd499
--- /dev/null
+++ b/package/psplash/psplash-quit.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=Terminate Psplash Boot Screen
+After=psplash-start.service
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/psplash-write QUIT
+TimeoutSec=20
+
+[Install]
+WantedBy=multi-user.target
diff --git a/package/psplash/psplash-start.service b/package/psplash/psplash-start.service
new file mode 100644
index 0000000..2de3cfc
--- /dev/null
+++ b/package/psplash/psplash-start.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=Starts Psplash Boot screen
+Wants=systemd-vconsole-setup.service
+After=systemd-vconsole-setup.service systemd-udev-trigger.service systemd-udevd.service
+DefaultDependencies=no
+
+[Service]
+ExecStart=/usr/bin/psplash -n
+
+[Install]
+WantedBy=sysinit.target
diff --git a/package/psplash/psplash.mk b/package/psplash/psplash.mk
index 83b6f79..b756266 100644
--- a/package/psplash/psplash.mk
+++ b/package/psplash/psplash.mk
@@ -9,4 +9,18 @@ PSPLASH_SITE = git://git.yoctoproject.org/psplash
 PSPLASH_LICENSE = GPLv2+
 PSPLASH_AUTORECONF = YES
 
+define PSPLASH_INSTALL_INIT_SYSTEMD
+	$(INSTALL) -D -m 644 package/psplash/psplash-start.service \
+		$(TARGET_DIR)/etc/systemd/system/psplash-start.service
+	$(INSTALL) -d $(TARGET_DIR)/etc/systemd/system/sysinit.target.wants
+	ln -sf  ../psplash-start.service \
+		 $(TARGET_DIR)/etc/systemd/system/sysinit.target.wants/
+
+	$(INSTALL) -D -m 644 package/psplash/psplash-quit.service \
+		$(TARGET_DIR)/etc/systemd/system/psplash-quit.service
+	$(INSTALL) -d $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants
+	ln -sf  ../psplash-quit.service \
+		 $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/
+endef
+
 $(eval $(autotools-package))
-- 
1.9.1