GNU logs - #63554, boring messages

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Subject: bug#63554: 'shared mount flag ignored on file-system configuration
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Date: Wed, 17 May 2023 09:39:48 +0000
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Hello,

I'm trying to mount my root partition as "shared" for rootless podman conta=
iners, however adding the flag to my system.scm does not seem to have the d=
esired effect:

w@guix ~> grep -B4 shared /run/current-system/configuration.scm
 (file-systems (cons* (file-system
                       (mount-point "/")
                       (device (file-system-label "GUIX_ROOT"))
                       (type "ext4")
                       (flags '(shared))) ;; shared does not work?
w@guix ~> findmnt -o PROPAGATION /
PROPAGATION
private
w@guix ~> sudo mount -o remount,shared /
w@guix ~> findmnt -o PROPAGATION /
PROPAGATION
shared

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Wilke Schwiedop <wilke.schwiedop@HIDDEN>
Subject: bug#63554: Acknowledgement ('shared mount flag ignored on
 file-system configuration)
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Date: Wed, 17 May 2023 13:15:03 +0000

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Subject: bug#63554: 63554
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 Content preview:  Also&nbsp;had&nbsp;this&nbsp;exact&nbsp;same&nbsp;problem.&nbsp;Looking&nbsp;at&nbsp;patch&nbsp;#56880,&nbsp;it&nbsp;tried&nbsp;to&nbsp;add&nbsp;the&nbsp;shared&nbsp;option,&nbsp;but&nbsp;found&nbsp;t
    [...] 
 
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Subject: bug#63554: 63554
Resent-From: Jelle Licht <jlicht@HIDDEN>
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(I decoded html entities ):
"andy" via Bug reports for GNU Guix <bug-guix@HIDDEN> writes:
>  Also had this exact same problem. Looking at patch #56880, it tried
>  to add the shared option, but found that the `mount(2)` syscall had
>  to be called twice, once to mount it, then once to make the already
>  existing mount shared, so just adding the bit-flag `MS_SHARED` to
>  that syscall didn't work. The patch seems to not include that bitflag
>  until someone needed it enough to implement calling `mount(2)`
>  twice. Pretty sure the option doesn't do anything because it doesn't
>  change the bit-flag in the `mount-flags->bit-mask` procedure at
>  https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/build/file-systems.scm#n1155
>  So the bug seems to be intentional, and a fix would have to have guix
>  first mount the filesystem normally, then change it to a shared
>  mount.

Is this something that just needs to be picked up by someone, or would
it be more complicated than that?

- Jelle

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