Docker build issue - solved

Whenever I try to build a docker image with nix (not nixos), I recently get stuck with this error:

building '/nix/store/ymfhh17bm1n9hsvhgl1ky78qb18d2d1b-registry.quantumops.rocks-ae-dir-web-server-base.json.drv'...
building '/nix/store/280hk9ql82q2n87p8n5j9rhhkn5bg8wf-registry.quantumops.rocks-ae-dir-web-server-bulk-layers.drv'...
building '/nix/store/d6wq607893l6s4v9c6x57mwdfwc1yj5m-closure.drv'...
building '/nix/store/1wlhdi3518fyp92l7w9rnvwqq1wrllr6-registry.quantumops.rocks-ae-dir-web-server-customisation-layer.drv'...
error: moving build output '/nix/store/frbhvc8srsm4jgpah8lfww2pcgw2a5zw-registry.quantumops.rocks-ae-dir-web-server-customisation-layer' from the sandbox to the Nix store: Permission denied

I’m using a pretty recent nixpkgs (12 days ago):
https://github.com/nixos/nixpkgs/commit/30e98a4fd67c71277ee95c58c8fd691b69a09183
I also use the nix packaged pinned by that version. → it is not respected:

PATH=/home/blaggacao/.nix-profile/bin:/home/blaggacao/.nix-profile/bin:/nix/var/nix/profiles/default/bin:/nix/store/57pilyyns1gvdyw7rxjkpkca1ya667sf-aedir.k8s-env/bin[...]

ll /nix/store/57pilyyns1gvdyw7rxjkpkca1ya667sf-aedir.k8s-env/bin/nix
nix ⇒ /nix/store/jjmar1q8k7l25mdmnhpxs9nwaa38rpnk-nix-2.3.7/bin/nix

# BUT

$ which nix
/home/blaggacao/.nix-profile/bin/nix

# nasty, but crafting the following doesn't seem to fix it
$ which nix
/nix/store/57pilyyns1gvdyw7rxjkpkca1ya667sf-aedir.k8s-env/bin/nix
$ nix --version
nix (Nix) 2.3.7

Bug filed for this occasional discovery during debugging here: https://github.com/NixOS/nix/issues/4152


I tried with both: sandbox = true and # sandbox = true to no success.

Can anybody help me to fix this? (hopefully upstream)


Things I’ve researched:


$ nix --version
nix (Nix) 3.0pre19700101_11882d7

works again. That probably means some of those referenced issues can be closed. I’d really like to hint there, but I only understand 10-20% of what’s going on.

When I run as sudo, I’m greeted with:

error: the group 'nixbld' specified in 'build-users-group' does not exist

single user nix? or multiuser nix?

I think single user. Since it worked before, might it be a regression?

$ ll /nix
drwxrwxr-x blaggacao blaggacao 2.8 MB Thu Oct 15 18:18:59 2020  store
drwxr-xr-x blaggacao blaggacao   4 KB Fri Jul 17 23:27:05 2020  var

→ I’m running from within a nix shell.

The problem persists with:

$ nix --version
nix (Nix) 3.0pre20200829_f156513
$ nix --version
nix (Nix) 3.0pre19700101_11882d7

works again. That probably means some of those referenced issues can be closed. I’d really like to hint there, but I only understand 10-20% of what’s going on.