bug#46292: ‘guix environment -C’ fails with Linux 4.19 (Debian)

[Ludovic Courtès]

Hi Lucas,

Lucas Nussbaum <lucas.nussbaum@inria.fr> skribis:

> On 18/02/21 at 12:38 +0100, Ludovic Courtès wrote:

[...]

>> I tried grabbing mount options from there and reapplying them to the
>> MS_REMOUNT call (patch below).  However, that still doesn’t work:
>> 
>> --8<---------------cut here---------------start------------->8---
>> 14273 
>> mount("/gnu/store/mmhimfwmmidf09jw1plw3aw1g1zn2nkh-bash-static-5.0.16", 
>> "/tmp/guix-directory.Plgkgt//gnu/store/mmhimfwmmidf09jw1plw3aw1g1zn2nkh-bash-static-5.0.16",
>>  0x236a4b0, MS_RDONLY|MS_REMOUNT|MS_BIND, "rw,nosuid,nodev,relatime") = -1 
>> EPERM (Operation not permitted)
>> --8<---------------cut here---------------end--------------->8---
>
> That's strange: it worked in my manual tests.

I investigated some more and can’t get it to work.  Do you happen to
have a working invocation or C snippet?

Thanks,
Ludo’.