If someone runs `updatectl update`, sysupdate will be running multiple
update jobs at the same time, which can make reasoning about the output
in the journal quite difficult. Especially if things go wrong: the error
messages didn't mention which job failed. Nor was there any link between
job ID and the PID of the worker process logging to the journal. This
is all fixed here!
Cuts out some `strdup`s, and also avoids a rather weird case of donating
memory to a function. Basically just duplicates the solution I just
implemented for sysupdate's callout handler.
This fixes a bug introduced during review of sysupdated. Originally,
we just returned EALREADY verbatim to signify that the target is
already up-to-date. Then we switched this to a proper error
(org.freedesktop.sysupdate1.NoCandidate) during review. But that now
maps to EIO, not EALREADY. Thus, whenever there's nothing to update,
updatectl would report I/O errors to the user, even though nothing
actually went wrong.
Mike Yuan
Adrian Vovk
