[Buildroot] [PATCH v3] package/swupdate: add basic systemd service

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

On Thu, 16 Apr 2020 14:02:09 -0500
Matt Weber <matthew.weber@rockwellcollins.com> wrote:

> +ifeq ($(BR2_PACKAGE_SWUPDATE_INSTALL_WEBSITE),y)
> +define SWUPDATE_INSTALL_INIT_SYSTEMD
> +	$(INSTALL) -D -m 644 package/swupdate/swupdate.service \
> +		$(TARGET_DIR)/usr/lib/systemd/system/swupdate.service
> +	mkdir -p $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants

Is creating this directory still necessary? I believe not. Other
packages that install a systemd .service do not create such a directory.

>  $(eval $(kconfig-package))
> diff --git a/package/swupdate/swupdate.service b/package/swupdate/swupdate.service
> new file mode 100644
> index 0000000000..232bd9956e
> --- /dev/null
> +++ b/package/swupdate/swupdate.service
> @@ -0,0 +1,18 @@
> +[Unit]
> +Description=SWUpdate daemon
> +Documentation=https://github.com/sbabic/swupdate
> +Documentation=https://sbabic.github.io/swupdate
> +
> +[Service]
> +# Default environment variables in case /etc/default/swupdate isn't providing them
> +Environment=SWU_POST_UPDATE_CMD="touch /tmp/.swu_complete"
> +Environment=SWU_WEBSERVER_ARGS="-p 8080 -r /var/www/swupdate/"
> +
> +# Always take what is in the environment files when exists
> +EnvironmentFile=/etc/default/swupdate
> +
> +ExecStart=/usr/bin/swupdate ${SWU_KEY_ARGS} -p ${SWU_POST_UPDATE_CMD} -v -L -w "${SWU_WEBSERVER_ARGS}"

It this really the right way of doing this, i.e to force the options to
be -p ... -v -L -w .. ?

Shouldn't this be replaced entirely by:

[Service]
Environment=SWUPDATE_ARGS="your default set of options"
EnvironmentFile=/etc/default/swupdate
ExecStart=/usr/bin/swupdate ${SWUPDATE_ARGS}

so that the arguments can be fully customized from
/etc/default/swupdate ?

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com