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bug#48368: bug#47172: Shepherd 0.8.1 tests fail on core-updates


From: Marius Bakke
Subject: bug#48368: bug#47172: Shepherd 0.8.1 tests fail on core-updates
Date: Sun, 23 May 2021 17:23:48 +0200

Ludovic Courtès <ludo@gnu.org> skriver:

> Ludovic Courtès <ludo@gnu.org> skribis:
>
>> This turns out to be due to a… miscompilation bug.
>>
>> In (shepherd scripts herd), ‘run-command’ has this code:
>>
>>   (let ((sock    (open-connection socket-file))
>>         (action* (if (and (eq? action 'detailed-status)
>>                           (memq service '(root shepherd)))
>>                      'status
>>                      action)))
>>     …)
>>
>> Problem is that everything works as if (eq? action 'detailed-status)
>> was omitted, such that ‘herd stop root’ is interpreted as ‘herd status
>> root’.
>
> A workaround that works with 3.0.7 is swapping the two ‘and’
> sub-expressions:
>
> diff --git a/modules/shepherd/scripts/herd.scm 
> b/modules/shepherd/scripts/herd.scm
> index 106de1e..39d2e34 100644
> --- a/modules/shepherd/scripts/herd.scm
> +++ b/modules/shepherd/scripts/herd.scm
> @@ -126,8 +126,8 @@ of pairs."
>  the daemon via SOCKET-FILE."
>    (with-system-error-handling
>     (let ((sock    (open-connection socket-file))
> -         (action* (if (and (eq? action 'detailed-status)
> -                           (memq service '(root shepherd)))
> +         (action* (if (and (memq service '(root shepherd))
> +                           (eq? action 'detailed-status))
>                        'status
>                        action)))
>       ;; Send the command.

Cc'ing the relevant Guile bug:

  https://bugs.gnu.org/48368

See also commit 79be6a985799adc6d663890250f4fb7c12f015b4 on
'core-updates' that builds with -O1 as a less satisfactory workaround.

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