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

From: Ludovic Courtès <[email-masked]>
Date: Sun, 23 May 2021 15:49:17 +0200

Ludovic Courtès <[email-masked]> 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.

Ludo’.