Nixos-rebuild: Difference between revisions
added note, that all flake files need to be tracked by the repo to rebuild successfully |
Add note about using nixos-rebuild to switch to a specific generation |
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For a full list of sub-commands and options, see the <code>nixos-rebuild</code> man page. | For a full list of sub-commands and options, see the <code>nixos-rebuild</code> man page. | ||
===Rolling back to a specific generation=== | |||
As noted earlier, it possible to switch to the previous generation using the command <code>nixos-rebuild switch --rollback</code> | |||
As of December 2024, <code>nixos-rebuild</code> doesn't have built-in functionality to switch to a generation earlier than the previous. However, there is an [https://github.com/NixOS/nixpkgs/pull/105910/files open pull request] that adds this functionality. | |||
It is possible to manually simulate the behavior from this PR in the meantime. Run the following command to list your generations: | |||
<syntaxHighlight lang=console> | |||
$ nixos-rebuild list-generations | |||
Generation Build-date NixOS version Kernel Configuration Revision Specialisation | |||
1054 current 2024-12-02 08:47:16 24.11.20241130.62c435d 6.12.1 * | |||
1053 2024-12-02 08:44:23 24.11.20241130.62c435d 6.12.1 * | |||
1052 2024-12-02 08:25:54 24.11.20241130.62c435d 6.12.1 * | |||
... | |||
</syntaxHighlight> | |||
Run the command <code>/nix/var/nix/profiles/system-N-link/bin/switch-to-configuration switch</code> where <code>N</code> is the generation number you want to switch to. | |||
You can manually see that <code>/nix/var/nix/profiles/</code> contains symlinks to the system closures associated with the listed generations by <code>nixos-rebuild list-generations</code> above: | |||
<syntaxHighlight lang=console> | |||
$ ls -l /nix/var/nix/profiles/ | |||
lrwxrwxrwx - root root 2 12月 08:25 system-1052-link -> /nix/store/a5sh1kam9j42gcgca11ax5wg0iaiccab-nixos-system-onyx-24.11.20241130.62c435d | |||
lrwxrwxrwx - root root 2 12月 08:44 system-1053-link -> /nix/store/nhba65kybj6y0gyd307mf9wj3089rf08-nixos-system-onyx-24.11.20241130.62c435d | |||
lrwxrwxrwx - root root 2 12月 08:47 system-1054-link -> /nix/store/97wrfk1dmgbivw35wrkmrg0d0c1zhviw-nixos-system-onyx-24.11.20241130.62c435d | |||
</syntaxHighlight> | |||
===Specifying a different configuration location=== | ===Specifying a different configuration location=== | ||