Joshua Watt schrieb am Mo 13. Jul, 10:29 (-0600):
> On Mon, Jul 6, 2026 at 10:59 AM Jörg Sommer via lists.openembedded.org
> <[email protected]> wrote:
> 
> > From: Jörg Sommer <[email protected]>
> >
> > The old mtab pointed to /proc/mounts which itself is a symlink. Systemd
> > therefore tries to replace it with a symlink to /proc/self/mounts, but
> > fails
> > on a read-only rootfs:
> >
> >     systemd-tmpfiles: symlink(../proc/self/mounts, /etc/mtab) failed:
> > Read-only file system
> >
> > Signed-off-by: Jörg Sommer <[email protected]>
> > ---
> >  meta/recipes-core/base-files/base-files_3.0.14.bb | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/meta/recipes-core/base-files/base-files_3.0.14.bb
> > b/meta/recipes-core/base-files/base-files_3.0.14.bb
> > index d4d777b485..aafc0aa923 100644
> > --- a/meta/recipes-core/base-files/base-files_3.0.14.bb
> > +++ b/meta/recipes-core/base-files/base-files_3.0.14.bb
> > @@ -109,7 +109,7 @@ do_install () {
> >         install -m 0644 ${S}/host.conf ${D}${sysconfdir}/host.conf
> >         install -m 0644 ${S}/motd ${D}${sysconfdir}/motd
> >
> > -       ln -sf /proc/mounts ${D}${sysconfdir}/mtab
> > +       ln -sf ../proc/self/mounts ${D}${sysconfdir}/mtab
> >
> 
> This should be absolute /proc/self/mounts otherwise it's assuming
> sysconfdir is only one directory level deep, and AFIACT, there is no reason
> for it to be absolute

The path comes from tmpfiles.d/etc.conf. I suspect it has to do with the
containers and mounting proc with different options (hidepid, subset). So
the container root dir in /run/…/etc/mtab points to the right mounts file
viewing from the outside.

https://github.com/systemd/systemd/blob/9ac37aa0c7bc63dc93a29cbe631f394635ec425f/tmpfiles.d/etc.conf.in#L11

But `ln -s -f -T -n -r ${D}/proc/self/mounts ${D}${sysconfdir}/mtab` seems
to work.

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