bug#55638: time-machine: backtrace about maybe-remove-expired-cache-entries

[Maxime Devos]

Ludovic Courtès schreef op do 26-05-2022 om 17:05 [+0200]:
> This file was empty when you ran the command instead of containing an
> integer (could have been a file system corruption or something like
> that).
> 
> Solution:
> 
>   rm ~/.cache/guix/inferiors/last-expiry-cleanup

It's a work-around, but there's still an underlying problem: 
guix/cache.scm doesn't do 'fsync+rename', so the file is not created
atomically, so in case of an abrupt shutdown or C-c at the wrong time,
the file becomes corrupted without fault of the file system.

As such, WDYT of making last-expiry-date more robust, by treating
invalid contents as time=0 or something like that?

Greetings,
Maxime.

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