/nix/store bind-mount to an NFS mount incompatible with cntr about cntr HOT 6 OPEN

Usually this binary should be written to $TMPDIR and fallback to /tmp. Is $TMPDIR on your system also on NFS?

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I also have an experimental branch where I try to fallback to other directories: https://github.com/Mic92/cntr/pull/57/files#diff-96d5465b3dc8efadb91937f8745c3ad21bb114f524963f6ea57fa5e2ad2c435cR27

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Also what is the full error message?

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1. $TMPDIR was /tmp and on a local filesystem.
2. The binary was successfully written to a directory in /tmp, and it was visible in the container ls /.cntr/ as cntr-exec
3. However, when executing /.cntr/cntr-exec within the container I get an error message /.cntr/cntr-exec: Operation not supported with no further details(it succeeds when run outside the container).
4. Additionally stat /.cntr/cntr-exec fails within the container but stat /tmp/SOME-DIRECTORY-RECENTLY-MODIFIED/cntr-exec succeeds outside the container.

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This looks like a problem with the Fuse rather than NFS than. What is your kernel version?

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mburge@lam:~$ uname -a
Linux lam 5.4.0-77-generic #86-Ubuntu SMP Thu Jun 17 02:35:03 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
mburge@lam:~$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04 LTS
Release:	20.04
Codename:	focal

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