'shared mount flag ignored on file-system configuration

Hello,

I'm trying to mount my root partition as "shared" for rootless podman containers, however adding the flag to my system.scm does not seem to have the desired 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

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#n1155br/ br/ 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.

(I decoded html entities ):

"andy" via Bug reports for GNU Guix <bug-guix@gnu.org> writes:

Is this something that just needs to be picked up by someone, or would

it be more complicated than that?

- Jelle