[Buildroot] [PATCH] package/quagga: Add systemd.service file

[Nathaniel Roach <nroach44@gmail.com>]

On 27/06/16 05:09, Arnout Vandecappelle wrote:
> On 25-06-16 19:02, Nathaniel Roach wrote:
>> Use a template service file as all of the daemons use almost
>> identical arguments and generally appear the same to the init
>> system.
>>
>> We "Wants=" zebra as that's the daemon for interfacing to the
>> kernel, and it's not required for the other daemons to work
>> but it's probably going to be used in nearly all setups.
>>
>> /usr/bin/env is needed as systemd doesn't allow the instance
>> variable (%i) in the executable path.
>>
>> We don't enable these services by default as this would require
>> creating configuration and /etc/default files. (And is easily
>> achieved with an FS overlay)
>                               ^missing .
>
>   So the goal of this patch is that the user simply can symlink to instead of
> having to create the service file.
>
>   However, since the Wants= is added for zebra, it would make sense to create the
> zebra symlink, no?
No, systemd will automatically start zebra when it's needed. It's not 
needed until one of the other daemons start (which systemd will start 
zebra beforehand if the daemon is local). If they are remote, the user 
can enable zebra themselves.
>
>> Signed-off-by: Nathaniel Roach <nroach44@gmail.com>
>> ---
>> Changes v1 -> v2:
>>   (As suggested by Arnout Vandecappelle)
>>   - Completely remove shim and use /usr/bin/env instead
>>   - Don't tell quagga to fork as systemd prefers it
>>   - Add comment to .service file about /usr/bin/env
>>   - Explain not enabling the service on build in patch
>>
>> ---
>>   package/quagga/quagga.mk       |  3 +++
>>   package/quagga/quagga at .service | 20 ++++++++++++++++++++
>>   2 files changed, 23 insertions(+)
>>   create mode 100644 package/quagga/quagga at .service
>>
>> diff --git a/package/quagga/quagga.mk b/package/quagga/quagga.mk
>> index 22e90ad..5b5623f 100644
>> --- a/package/quagga/quagga.mk
>> +++ b/package/quagga/quagga.mk
>> @@ -75,6 +75,9 @@ endif
>>   define QUAGGA_INSTALL_INIT_SYSTEMD
>>   	$(INSTALL) -D -m 644 package/quagga/quagga_tmpfiles.conf \
>>   		$(TARGET_DIR)/usr/lib/tmpfiles.d/quagga.conf
>> +
>   This empty line is redundant.
>
>> +	$(INSTALL) -D -m 644 package/quagga/quagga at .service \
>> +		$(TARGET_DIR)/usr/lib/systemd/system/quagga at .service
>>   endef
>>   
>>   $(eval $(autotools-package))
>> diff --git a/package/quagga/quagga at .service b/package/quagga/quagga at .service
>> new file mode 100644
>> index 0000000..b17af89
>> --- /dev/null
>> +++ b/package/quagga/quagga at .service
>> @@ -0,0 +1,20 @@
>> +[Unit]
>> +Description=Quagga %i routing daemon
>> +PartOf=quagga.service
>   I don't understand this. Doesn't the quagga.service actually have to exist for
> this to be valid?
That is true, it's left over from my openvpn service file. Will remove 
that and ReloadPropagatedFrom=
>
>> +ReloadPropagatedFrom=quagga.service
>> +Wants=quagga at zebra.service
>   I just realize now: this line should probably be removed when
> BR2_PACKAGE_QUAGGA_ZEBRA is not set.
Also true, however that's why I said Wants= and not Requires= so systemd 
handles the lack of zebra fine.
>
>> +
>> +[Service]
>> +PrivateTmp=true
>> +KillMode=mixed
>   It would make sense to keep this together with KillSignal.
>
>> +Type=simple
>> +EnvironmentFile=/etc/default/quagga-%i
>> +# Systemd doesn't like having %i in the executable path.
>> +ExecStart=/usr/bin/env /usr/sbin/%i $OPTS -f /etc/quagga/%i.conf -i /var/run/quagga/%i.pid
>> +PIDFile=/var/run/quagga/%i.pid
>   I repeat, I'm not very familiar with systemd, but as I understand it PID files
> shouldn't be needed anymore with a Type=simple daemon. Unless of course if
> quagga uses them somewhere else too.
Also correct. I left the -i argument in as I thought it was required for 
vtysh, but it is not.
>
>
>   Regards,
>   Arnout
>
>> +KillSignal=SIGINT
>> +Restart=on-failure
>> +RestartSec=1
>> +
>> +[Install]
>> +WantedBy=multi-user.target
>>
>
Thanks for the feedback!

Nathaniel Roach