Re: How do you define a service?

[Efraim Flashner <efraim@flashner.co.il>]

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On Sun, Oct 18, 2020 at 04:53:17PM +0200, divoplade wrote:
> Thank you for your responses. I reduced down the problem further.
> 
> The following program, as run in a service, creates an *empty* file
> "/tmp/wtf", and runs for a minute:
> 
> (format (open-output-file "/tmp/wtf") "WTF???\n")
> 
> (sleep 60)
> 
> The following program, as run in the same condition, create an *empty*
> file and fails immediately:
> 
> (with-output-to-file "/tmp/wtf"
>   (display "WTF???\n"))
> 
> (sleep 60)
> 
> So I think the question is rather, whether Guile can actually work in a
> shepherd forkexec environment: I guess the standard ports are closed,
> so maybe guile panics when it is time to flush the data, even if the
> ports are redirected.

forkexec does close the standard ports. Unfortunately I don't see that
mentioned in the manual¹. I know it's mentioned somewhere in the code
but I can't find it anywhere right now.

> Do you have an example of a service written in guile that works in this
> context?
> 
> Best regards,
> 
> divoplade

¹ https://www.gnu.org/software/shepherd/manual/html_node/Service-De_002d-and-Constructors.html#Service-De_002d-and-Constructors

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