Re: One-shot Shepherd services

["Ludovic Courtès" <ludo@gnu.org>]

Hi Gábor,

Gábor Boskovits <boskovits@gmail.com> skribis:

> Ludovic Courtès <ludo@gnu.org> ezt írta (időpont: 2019. ápr. 30., K, 16:24):
>
>> Chris Marusich <cmmarusich@gmail.com> skribis:
>>
>> > At first I was a little confused about why we would ever want to use a
>> > one-shot shepherd service instead of an activation snippet, but after
>> > reviewing the account-shepherd-service, I think I understand.  It seems
>> > that we make it a one-shot shepherd service instead of an activation
>> > snippet so that we can take advantage of shepherd's service dependency
>> > management.  In the case of account-shepherd-service, it looks like we
>> > made it a shepherd service to ensure that it would run after
>> > 'file-systems' is up.  This makes sense, since it could be a little
>> > awkward to try to ensure proper execution order by extending the
>> > activation service, and even if we did that, it would duplicate the
>> > dependency management logic that shepherd gives us already.
>>
>> Yes, that’s exactly the reason.
>>
>>
> This raises the question, if we are willing to convert some more activation
> snippets to one-shot services. Are there any candidates for that?

Good question, maybe things like ssh-keygen.  Or maybe we could turn all
the service activation snippets into one-shot services that the service
depends on.

However, since the Shepherd 0.6.0 UI doesn’t allow users to distinguish
between one-shot and normal services, it’s probably a good idea to not
do this yet.  Otherwise “herd status” would list loads of stopped
services, which could be confusing.

I think we should first adjust the Shepherd UI.

Ludo’.