Ludovic Courtès (2019-11-01 15:26:27 +0100) wrote:
> Ivan Vilata i Balaguer <i...@selidor.net> skribis:
>
> > Ludovic Courtès (2019-10-29 23:16:49 +0100) wrote:
> >>
> >> Ivan Vilata i Balaguer <i...@selidor.net> skribis:
> >>
> >> > Hi! While using Guix commit `c9fc03a3` on Debian unstable, whenever I
> >> > run
> >> > `guix environment -CN` (either as a normal user or as root) I get an
> >> > error
> >> > like this:
> >> >
> >> > guix environment: error: mount: mount "/var/run/nscd" on
> >> > "/tmp/guix-directory.6kBgXe//var/run/nscd": Operation not permitted
> >> >
> >> > nscd is installed and working in my host machine.
> >>
> >> What does ‘uname -rs’ return?
> >
> > $ uname -rs
> > Linux 5.2.0-3-amd64
> >
> >> What about ‘ls -ld /var/run/nscd’?
> >
> > $ ls -ld /var/run/nscd
> > drwxr-xr-x 2 root root 60 Oct 29 15:58 /var/run/nscd
>
> Hmm, what does this command return:
>
> mkdir /tmp/tt
> unshare -mUr mount --bind /var/run/nscd /tmp/tt
>
> ?
$ mkdir /tmp/tt
$ unshare -mUr mount --bind /var/run/nscd /tmp/tt && echo ok
ok
> What about a read-only bind mount like this:
>
> unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt
>
> ?
This one looks more interesting:
$ unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt && echo ok
mount: /tmp/tt: filesystem was mounted, but any subsequent operation
failed: Unknown error 5005.
$ echo $?
32
> What if you try bind-mounting a directory owned by your user?
>
> mkdir /tmp/mine
> unshare -mUr mount --bind /tmp/mine /tmp/tt
>
> ?
$ mkdir /tmp/mine
$ unshare -mUr mount --bind /tmp/mine /tmp/tt && echo ok
ok
> Thanks in advance,
> Ludo’.
Thanks to you! Saluton,
--
Ivan Vilata i Balaguer -- https://elvil.net/
