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Nix, the purely functional package manager
https://nixos.org/
GNU Lesser General Public License v2.1
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nix-build is confused about --root and --channel #5074

Open wmertens opened 3 years ago

wmertens commented 3 years ago

Describe the bug

When trying to use a channel that's only in a provided root, nix-build is confused.

I think the evaluation needs to happen with the store pointing to the given --root.

Steps to reproduce

[root@stratokit-nixos-iso:~]# nixos-install --root /mnt --channel nixpkgs=https://releases.nixos.org/nixos/21.05/nixos-21.05.1240.71326cd12dd/nixexprs.tar.xz --no-channel-copy --show-trace
building the configuration in /mnt/etc/nixos/configuration.nix...
error: opening file '/nix/store/gfzhl0r80gnii61fhxqy7vfwzhrymx5g-nixexprs.tar.xz': No such file or directory

[root@stratokit-nixos-iso:~]# ll /nix/store/gf*
ls: cannot access '/nix/store/gf*': No such file or directory

[root@stratokit-nixos-iso:~]# ll /mnt/nix/store/gf*
-rw-r--r-- 1 root root 18293440 Jul 30 13:21 /mnt/nix/store/gfzhl0r80gnii61fhxqy7vfwzhrymx5g-nixexprs.tar.xz
-rw------- 1 root root        0 Jul 30 13:18 /mnt/nix/store/gfzhl0r80gnii61fhxqy7vfwzhrymx5g-nixexprs.tar.xz.lock

In particular, the reason is nix-build:

[root@stratokit-nixos-iso:~]# sh -xv /run/current-system/sw/bin/nixos-install --root /mnt --channel nixpkgs=https://releases.nixos.org/nixos/21.05/nixos-21.05.1240.71326cd12dd/nixexprs.tar.xz --no-channel-copy --show-trace

[...]

+ nix-build --out-link /mnt/tmp.qoKo7OmTa3/system --store /mnt --show-trace --extra-substituters 'auto?trusted=1' '<nixpkgs/nixos>' -A system -I nixos-config=/mnt/etc/nixos/configuration.nix

I can make it work by not passing a channel and instead use the one the CD was built with:

# NIX_PATH=nixpkgs=/root/.nix-defexpr/channels/nixos sh -xv /run/current-system/sw/bin/nixos-install --root /mnt --no-channel-copy --show-trace

And I can also work around it by prefetching the channel:

[root@stratokit-nixos-iso:~]# nix-prefetch-url https://releases.nixos.org/nixos/21.05/nixos-21.05.1240.71326cd12dd/nixexprs.tar.xz
[17.4 MiB DL]
path is '/nix/store/gfzhl0r80gnii61fhxqy7vfwzhrymx5g-nixexprs.tar.xz'
1css7s7jkj2dnzbldlkab61fmwgzm7djg9w8dkvky4hgw1j3qm6x
[root@stratokit-nixos-iso:~]# nixos-install --root /mnt --channel nixpkgs=https://releases.nixos.org/nixos/21.05/nixos-21.05.1240.71326cd12dd/nixexprs.tar.xz --no-channel-copy --show-trace
building the configuration in /mnt/etc/nixos/configuration.nix...
[...works]

nix-env --version output

nix-env (Nix) 2.3.12

stale[bot] commented 2 years ago

I marked this as stale due to inactivity. → More info