nix-2.4 conflicts with programs.zsh.enable

[spease]

Describe the bug

building the system configuration...
these derivations will be built:
  /nix/store/f757qsid5bpw9y1sd3mi98yvlhdk6279-org.nixos.nix-gc.plist.drv
  /nix/store/xp0ccm8sva8xr3dghvikck6hfikqhr9h-org.nixos.nix-daemon.plist.drv
  /nix/store/99i8h30phs0zshnrlhmc3phmf93jz2gy-launchd.drv
  /nix/store/m0ssv6jkvbx2qv4byzc2f25zfbfdrysj-darwin-rebuild.drv
  /nix/store/hqd1jv9lp2y1x4g5dxkhqqsw3w366a5z-system-path.drv
  /nix/store/ny7vfsbqr35wzalhdgfhdyrx4xa3q52q-system-applications.drv
  /nix/store/llharndqwpji8j6f1gwhf5n2ln29c9d5-darwin-system-21.11pre325512.22a500a3f87+darwin4.0000000.drv
building '/nix/store/m0ssv6jkvbx2qv4byzc2f25zfbfdrysj-darwin-rebuild.drv'...
building '/nix/store/xp0ccm8sva8xr3dghvikck6hfikqhr9h-org.nixos.nix-daemon.plist.drv'...
building '/nix/store/f757qsid5bpw9y1sd3mi98yvlhdk6279-org.nixos.nix-gc.plist.drv'...
building '/nix/store/99i8h30phs0zshnrlhmc3phmf93jz2gy-launchd.drv'...
building '/nix/store/ny7vfsbqr35wzalhdgfhdyrx4xa3q52q-system-applications.drv'...
building '/nix/store/hqd1jv9lp2y1x4g5dxkhqqsw3w366a5z-system-path.drv'...
created 3 symlinks in user environment
error: collision between `/nix/store/475pa4h5rd6289zm8iga507ppl3k9zwn-nix-2.4pre-rc1/share/zsh/site-functions/_nix' and `/nix/store/2ssnzzjz8pqxcl3jv9sbcphiqsrxd8x3-nix-zsh-completions-0.4.4/share/zsh/site-functions/_nix'
builder for '/nix/store/hqd1jv9lp2y1x4g5dxkhqqsw3w366a5z-system-path.drv' failed with exit code 25
cannot build derivation '/nix/store/llharndqwpji8j6f1gwhf5n2ln29c9d5-darwin-system-21.11pre325512.22a500a3f87+darwin4.0000000.drv': 1 dependencies couldn't be built
error: build of '/nix/store/llharndqwpji8j6f1gwhf5n2ln29c9d5-darwin-system-21.11pre325512.22a500a3f87+darwin4.0000000.drv' failed

Steps To Reproduce

Set nix.package to pkgs.nix_2_4 with programs.zsh.enable = true;

Expected behavior

nix

nix-env --version output

Additional context

[Enzime]

Nixpkgs checks the Nix version and patches nix-zsh-completions:

https://github.com/NixOS/nixpkgs/blob/0699530f08290f34c532beedd66046825d9756fa/nixos/modules/programs/zsh/zsh.nix#L286-L300

While nix-darwin and home-manager do not:

https://github.com/LnL7/nix-darwin/blob/a7492a8c76dcc702d0a65cd820a5f9baa8702684/modules/programs/zsh/default.nix#L103
https://github.com/nix-community/home-manager/blob/master/modules/programs/zsh.nix#L447

Maybe it would be a better idea to change the derivation for nix-zsh-completions so that the downstream modules don't have to handle this complexity.

[spease]

The home-manager approach is also the only one described in the wiki:
https://nixos.wiki/wiki/Zsh

[shroomist]

stumbled on this just now after upgrading to nix-2.4, had to manually do the patch that Enzyme mentioned.

[ahmedelgabri]

@shroomist would you mind sharing what you exactly did?

[npajkovsky]

@shroomist I'm interested too.

[shroomist]

@ahmedelgabri @npajkovsky

1. switched back to default nix (basically undo nix.package = pkgs.nixFlakes) so that rebuilding works.
2. switched off programs.zsh.enableCompletion
3. darwin-rebuild switch
4. remove the conflicting file that was left over from programs zsh completions rm /nix/store/2ssnzzjz8pqxcl3jv9sbcphiqsrxd8x3-nix-zsh-completions-0.4.4/share/zsh/site-functions/_nix
5. switch back the completions and pkgs.nixFlakes and rebuild

[ahmedelgabri]

Thanks @shroomist 👍🏼

I think the first step is not needed, instead, I removed nix-zsh-completion & disabled programs.zsh.enableCompletion

Then followed the rest of the steps.

[nixos-discourse]

This issue has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/resolving-conflicts-nix-2-4-nix-zsh-completion/16006/2

[spease]

For pkgs.nix_2_4, I don't think you need to change pkgs.nixFlakes. Just disable completion, switch, remove the file, reenable completions, and switch.

[spease]

Note also that I got:

error: not linking environment.etc."zshrc" because /etc/zshrc already exists, skipping...
existing file has unknown content d40c3b1aef347d29aa8a340937e281b132b3747a9f0018d50aa1119d7da33987, move and activ
ate again to apply

I checked that the pre-nix backup was the same and removed /etc/zshrc and that fixed that error.

[juev]

I have disabled completions:

  programs.zsh = {
    inherit shellAliases;
    enable = true;
    enableCompletion = false;

but switch id not working. I got error:

Converting contributing.adoc to DocBook ...
error: collision between `/nix/store/csadkv9vsi64sxx8nq08ydy88j3b3kwp-nix-2.4/share/zsh/site-functions/_nix' and `/nix/store/9aggbz1bcndl0la8b42y4ridwp7wgvwq-nix-zsh-completions-0.4.4/share/zsh/site-functions/_nix'
builder for '/nix/store/vppjhlz5l0miz8x7wnpc7ivl04cyz9iw-system-path.drv' failed with exit code 25
cannot build derivation '/nix/store/y8qwlfja3j3a00gghzfagzkid6c74rb8-darwin-system-21.11pre330079.bf346b557b7+darwin4.0000000.drv': 1 dependencies couldn't be built
error: build of '/nix/store/y8qwlfja3j3a00gghzfagzkid6c74rb8-darwin-system-21.11pre330079.bf346b557b7+darwin4.0000000.drv' failed

Trying to remove file:

sudo rm /nix/store/2ssnzzjz8pqxcl3jv9sbcphiqsrxd8x3-nix-zsh-completions-0.4.4/share/zsh/site-functions/_nix

it not helped.

update
I removed both files:

sudo rm /nix/store/csadkv9vsi64sxx8nq08ydy88j3b3kwp-nix-2.4/share/zsh/site-functions/_nix
sudo rm /nix/store/9aggbz1bcndl0la8b42y4ridwp7wgvwq-nix-zsh-completions-0.4.4/share/zsh/site-functions/_nix

after this switch was complete.

[luizribeiro]

Can we close this? I'm using nix 2.7 from unstable and am not running into this issue anymore.

[EncodePanda]

I have still this issue. I'm on nix 2.8

[daneov]

Present on Ubuntu with Nix 2.10.3.

[seanybaggins]

I have the same issue as well

$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 5.13.0-valve21.3-1-neptune, SteamOS, noversion, 20221005.1`
 - multi-user?: `no`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.11.1`
 - channels(deck): `"home-manager, nixpkgs"`
 - nixpkgs: `/home/deck/.nix-defexpr/channels/nixpkgs`

[seanybaggins]

Following @spease's instructions also seamed to fix my issue.