Running with 24.11 get build error after add flake.nix

[mwoodpatrick]

Describe the bug
Running with 24.11 and adding the simple flake.nix as /etc/nixos/flake.nix running:

sudo nixos-rebuild switch

I get:

error: flake 'path:/etc/nixos' does not provide attribute 'packages.x86_64-linux.nixosConfigurations."nixos".config.system.build.nixos-rebuild', 'legacyPackages.x86_64-linux.nixosConfigurations."nixos".config.system.build.nixos-rebuild' or 'nixosConfigurations."nixos".config.system.build.nixos-rebuild'

Removing the flake, system build completes normally

To Reproduce

See above

Expected behavior
System should build with no changes

Screenshots
Not applicable.

Environment (please complete the following information):

• NixOS Version: 24.11
• Nix version: 2.25.2

Additional context
NixOS is running on WSL-2:

wsl --version
WSL version: 2.4.4.0
Kernel version: 5.15.167.4-1
WSLg version: 1.0.65
MSRDC version: 1.2.5620
Direct3D version: 1.611.1-81528511
DXCore version: 10.0.26100.1-240331-1435.ge-release
Windows version: 10.0.22635.4515

[ryan4yin]

Please note the comment in flake.nix:

Please replace my-nixos with your hostname

The error indicates that your hostname is currently set to nixos. However, it appears that nixosConfigurations."nixos" is not defined in your `flake.nix.

To resolve this, you can attempt to replace my-nixos with nixos in the flake.nix file and then nixos-rebuild again.

[peppergrayxyz]

I had the same issue on NixOS. After following the command the host name was still the old name. After a reboot the host name was changed and then it worked. Maybe a new shell would have been sufficient too.