[OE-core] [PATCH] RFC: weston-init: Update systemd service unit.

[Daniel Díaz]

Based on the "ultimate" systemd service unit [1], this unit
works without the need of weston-start/weston-launch, as is
recommended by Weston developers.

It handles:
* proper VT/tty allocation and handling,
* PAM login (XDG environment settings),
* correct logging,
* optional arguments to Weston via config file.

[1] https://phabricator.freedesktop.org/T63

Signed-off-by: Daniel Díaz <daniel.diaz at linaro.org>
---
 meta/recipes-graphics/wayland/weston-init.bb       |  6 +++++
 .../wayland/weston-init/weston.service             | 31 +++++++++++++++++++---
 2 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/meta/recipes-graphics/wayland/weston-init.bb b/meta/recipes-graphics/wayland/weston-init.bb
index 22ba5f3..4a97eba 100644
--- a/meta/recipes-graphics/wayland/weston-init.bb
+++ b/meta/recipes-graphics/wayland/weston-init.bb
@@ -10,7 +10,13 @@ S = "${WORKDIR}"
 
 do_install() {
 	install -Dm755 ${WORKDIR}/init ${D}/${sysconfdir}/init.d/weston
+
+	# Install weston.service systemd service unit
 	install -Dm0644 ${WORKDIR}/weston.service ${D}${systemd_system_unitdir}/weston.service
+	sed -i  -e 's,/usr/bin,${bindir},g' \
+		-e 's,/etc,${sysconfdir},g' \
+		-e 's,/var,${localstatedir},g \
+		${D}${systemd_system_unitdir}/weston.service
 
 	# Install weston-start script
 	install -Dm755 ${WORKDIR}/weston-start ${D}${bindir}/weston-start
diff --git a/meta/recipes-graphics/wayland/weston-init/weston.service b/meta/recipes-graphics/wayland/weston-init/weston.service
index 689ce41..66d49ec 100644
--- a/meta/recipes-graphics/wayland/weston-init/weston.service
+++ b/meta/recipes-graphics/wayland/weston-init/weston.service
@@ -1,12 +1,37 @@
 [Unit]
-Description=Weston Wayland Compositor
+Description=Weston Wayland Compositor (on tty7)
 RequiresMountsFor=/run
+Conflicts=getty at tty7.service plymouth-quit.service
+After=systemd-user-sessions.service getty at tty7.service plymouth-quit-wait.service
 
 [Service]
 User=root
+PermissionsStartOnly=true
+
+# Log us in via PAM so we get our XDG & co. environment and
+# are treated as logged in so we can use the tty:
+PAMName=login
+
+# Grab tty7
+UtmpIdentifier=tty7
+TTYPath=/dev/tty7
+TTYReset=yes
+TTYVHangup=yes
+TTYVTDisallocate=yes
+
+# stderr to journal so our logging doesn't get thrown into /dev/null
+StandardOutput=tty
+StandardInput=tty
+StandardError=journal
+
 EnvironmentFile=-/etc/default/weston
-ExecStart=/usr/bin/weston-start -v -e -- $OPTARGS
+
+# Weston does not successfully change VT, nor does systemd place us on
+# the VT it just activated for us. Switch manually:
+ExecStartPre=/usr/bin/chvt 7
+ExecStart=/usr/bin/weston --log=/var/log/weston.log $OPTARGS
+
+IgnoreSIGPIPE=no
 
 [Install]
 WantedBy=multi-user.target
-
-- 
1.9.1