nixops deploys wrong schema

[basvandijk]

I just provisioned a new machine on Hetzner with nixops. After the initial successful deployment I did another deployment during which I got the following error:

$ nixops deploy  -s deployment/state.nixops -d stalling-net --include hermes
building all machine configurations...
hermes..........> copying closure...
hermes..........> error: current Nix store schema is version 10, but I only support 7

Note that I'm using nixos-16.09 and I haven't overridden nix with nixUnstable or anything. On hermes I'm using the following version of the nix tools:

$ nix-store --version
nix-store (Nix) 1.11.6

The Nix schema on hermes is indeed 10 (on my workstation it's 7):

$ cat /nix/var/nix/db/schema
10

After removing /nix/var/nix/db/schema the deployment went successful and the schema was back at 7:

$ cat /nix/var/nix/db/schema
7

Any idea what's going on?

[rbvermaa]

@basvandijk Is this after the initial reboot (so after the bootstrapping of nixos via the rescue system?)

[rbvermaa]

@aszlig Have you seen this before?

@basvandijk I will try to reproduce with 16.09 today.

[rbvermaa]

@basvandijk Is this with nixops 1.4 btw?

[aszlig]

I think this should be the issue:

nixops/nix/hetzner-bootstrap.nix

Line 83 in c3b164a

echo "chroot /mnt \"${base}/bin/nix-store\" --load-db <<'REGINFO'"

[rbvermaa]

@aszlig So this bootstrap gets built with a different nixpkgs, I guess (from NIX_PATH of the nixops process) ?

[aszlig]

@rbvermaa: Considering c5c49a1, is this still the case for Nix 1.11? Because if that's not the case we can just get back to not use nixUnstable during bootstrap.

[rbvermaa]

@aszlig will test that, thanks.

[basvandijk]

Great, I see you guys already spotted the problem.

@rbvermaa let me still answer your initial questions:

• I believe I noticed it after the initial reboot when I did a second nixops deploy.

• I'm using the default nixops that comes with nixos-16.09 which is nixops-1.4.

[rbvermaa]

@basvandijk Although I think the solution that aszlig mentions, will fix the issue for you, I haven't been able to reproduce the issue with nixops 1.4 and nixos-16.09 yet. Could you run one more command and post the output:

 $ nix-instantiate --eval-only '<nixpkgs>' -A lib.nixpkgsVersion

Please run this with the same NIX_PATH env variable as your nixops call (note that if you use -I to pass nixops a different nixpkgs, I do not need this one)

[basvandijk]

@rbvermaa the output is "16.09pre-git". Note I'm using the following revision of nixpkgs:

{
  "url": "https://github.com/NixOS/nixpkgs.git",
  "rev": "cd58b22b178cb01e17aeac548279293a847162f9",
  "date": "2017-02-06T20:06:19+01:00",
  "sha256": "0b5z38jm5b58pijjxyhlzisyna3x362rr7ijklnrnkggipxd32sx"
}

[fuzzy-id]

I just ran into this issue, too. I deploy to Hetzner. Initial deployment works. I stumbled over the error pasted by the OP after doing nixops modify […] and nixops deploy […].

$ nixops --version
NixOps 1.4
$ nix-instantiate --eval-only '<nixpkgs>' -A lib.nixpkgsVersion 
"16.09.1650.d2cd8a0"

[domenkozar]

Sounds like this is fixed in 08d5156

[domenkozar]

This appears to be fixed as said. Please reopen if issue persits.