systemd: Don't install services in basic.target, but use multi-user.t…

[LocutusOfBorg]

…arget instead.

The specified systemd service file declares an unusual WantedBy= relationship.

Most services that want to be started automatically at boot should use WantedBy=multi-user.target or WantedBy=graphical.target. Services that want to be started in rescue or single-user mode should instead use WantedBy=sysinit.target

Please refer to https://wiki.debian.org/Teams/pkg-systemd/rcSMigration for details.

[minminlittleshrimp]

dlt should be booted after basic.target phase when everything is setup.
sysinit ->[timers, paths, sockets]->basic

Main dependencies involved

The main issue is that Debian systemd makes all rcS.d ordered Before=sysinit.target, which in turn is ordered Before=basic.target. On the other hand, systemd by default orders all units After=basic.target (this can be removed with DefaultDependencies=no). 

Of course, /tmp must be mounted first for socket creation.
Suggestion of dlt.service:

...
DefaultDependencies=no --> this means After=basic.target
After=tmp.mount
[Service]
...
[Install]
WantedBy=

Moreover:

multi-user.target[¶](https://www.freedesktop.org/software/systemd/man/latest/systemd.special.html#multi-user.target)

    A special target unit for setting up a multi-user system (non-graphical). This is pulled in by graphical.target.

    Units that are needed for a multi-user system shall add Wants= dependencies for their unit to this unit during installation. This is best configured via WantedBy=multi-user.target in the unit's [Install] section.

We do not need any dependency here in dlt.service

Regards

[LocutusOfBorg]

Can you please followup with your changes then?

[minminlittleshrimp]

Since I cannot edit your repo, I close this one and continue with mine in which I add you as coauthor.
Regards