Lost w/ dependencies

[Hans Kurscheidt]

Dear All,

this is my 1st post here, please be patient....

I'm lost in uname -a
Linux orangepizero 4.19.62-sunxi #5.92 SMP Wed Jul 31 22:07:23 CEST 2019 
armv7l GNU/Linux

regarding systemd dependencies.

I need efis.service starting /after/ gpsd.service

I put every possible dependency into the UNIT file, but efis.service 
stats always before. gpsd.service establishs a socket and a dbus shared 
memory section and depending on a race condition efis.service fails to 
start, due to a segementation violation, because gpsd has not yet 
established the SHM.

systemctl --full status efis.service
● efis.service
 Â Â  Loaded: loaded (/lib/systemd/system/efis.service; enabled; vendor 
preset: enabled)
 Â Â  Active: active (running) since Thu 2021-02-18 19:32:16 CET; 32min ago
 Â Main PID: *789* (OrPi_EFIS.out)
 Â Â Â  Tasks: 5 (limit: 4915)
 Â Â  CGroup: /system.slice/efis.service
            └─789 /usr/bin/OrPi_EFIS.out

Feb 18 19:32:16 orangepizero systemd[1]: Started efis.service.
root at orangepizero:/home/hk# systemctl --full status gpsd.service
● gpsd.service - GPS (Global Positioning System) Daemon
 Â Â  Loaded: loaded (/lib/systemd/system/gpsd.service; enabled; vendor 
preset: enabled)
 Â Â  Active: active (running) since Thu 2021-02-18 19:32:16 CET; 33min ago
 Â  Process: *810* ExecStart=/usr/local/sbin/gpsd $GPSD_OPTIONS $OPTIONS 
$DEVICES (code=exited, status=0/SUCCESS)
 Â Main PID: *822* (gpsd)
 Â Â Â  Tasks: 2 (limit: 4915)
 Â Â  CGroup: /system.slice/gpsd.service
            └─822 /usr/local/sbin/gpsd -n /dev/ttyUSB0

and here's the UNIT file

cat /lib/systemd/system/efis.service
[UNIT]
Description=EFIS systemd service
DefaultDependencies=true
[Service]
Type=simple
BindsTo=dbus.service
BindsTo=gpsd.socket
After=dbus.service gpsd.service
ExecStart=/usr/bin/OrPi_EFIS.out
[Install]
WantedBy=multi-user.target
Also=gpsd.service

Can you help, before I go crazy??

Thank-you!

hk


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