Howto downgrade nix-daemon?

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1

It seems that my local proxy env vars override config is not working after upgrade to nix2.24. I tried downgrade. But even when switched to nixos-24.05, showing outputs.nixosConfigurations.nixos-gtr7.config.nix.package = «derivation /nix/store/3s2v85hm6jrhbz89bk7911x3x0lfp53p-nix-2.18.8.drv» at nix repl result, the systemd service unit nix-daemon remains being soft link of /nix/store/42lxam32cqq9sn2zdz4ym6ls2dzmfn19-nix-2.24.10/lib/systemd/system/nix-daemon.service.

is there any method to downgrade nix-daemon?

2

It sounds like you didn’t actually rebuild the system? Maybe because the daemon isn’t working so rebuilding doesn’t work? In that case you can just rollback to a previous system generation.

3

Rollback is for emergency. Although I’m building proxy router to skip this issue, which part of nix source is controlling nix-daemon version remains a question.

4

On NixOS, the nix daemon version is controlled by nix.package.
So either you didn’t rebuild and switch your config successfully, or you installed nix some other way somehow.

5

Test downgrade to 2.23, nix-daemon version switch succeed. downgrading to 2.18 is too much.

Downgrade to 2.20 errors:

$ systemd-run -E LOCALE_ARCHIVE -E NIXOS_INSTALL_BOOTLOADER= --collect --no-ask-password --pipe --quiet --service-type=exec --unit=nixos-rebuild-switch-to-configuration --wait /nix/store/d911j151a8312px1zfj3zbdyg54821w8-nixos-system-nixo
s-gtr7-25.05.20241119.23e89b7/bin/switch-to-configuration switch
Traceback (most recent call last):
  File "/nix/store/qgw8j0j5r49y9ngq4sc6q55skyy7m1yv-systemd-boot/bin/systemd-boot", line 435, in <module>
    main()
  File "/nix/store/qgw8j0j5r49y9ngq4sc6q55skyy7m1yv-systemd-boot/bin/systemd-boot", line 418, in main
    install_bootloader(args)
  File "/nix/store/qgw8j0j5r49y9ngq4sc6q55skyy7m1yv-systemd-boot/bin/systemd-boot", line 361, in install_bootloader
    gens = get_generations()
           ^^^^^^^^^^^^^^^^^
  File "/nix/store/qgw8j0j5r49y9ngq4sc6q55skyy7m1yv-systemd-boot/bin/systemd-boot", line 213, in get_generations
    gen_list = run(
               ^^^^
  File "/nix/store/qgw8j0j5r49y9ngq4sc6q55skyy7m1yv-systemd-boot/bin/systemd-boot", line 58, in run
    return subprocess.run(cmd, check=True, text=True, stdout=stdout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/px2nj16i5gc3d4mnw5l1nclfdxhry61p-python3-3.12.7/lib/python3.12/subprocess.py", line 571, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['/nix/store/i69bjkxbg9n43p257nbyi2yjv01i05vp-nix-2.20.9/bin/nix-env', '--list-generations', '-p', '/nix/var/nix/profiles/system']' died with <Signals.SIGSEGV: 11>.
Failed to install bootloader
warning: error(s) occurred while switching to the new configuration
6

by the way, the root cause is git fetch fails .netrc parse with libcurl 8.11.0 · Issue #15496 · curl/curl · GitHub.

everything go fine after removing nix.settings.netrc-file.

7

I mean I very much do not think so. The ability to rollback like it’s nothing is one of nixos’s greatest strengths.

3 Likes
8

why would libcurl be related to systemd-boot config?

9

The error wasn’t from systemd-boot, it was from the part of the boot loader installation script that calls nix-env --list-generations.

10

Splitting hairs still doesn’t answer my question lol

11

I don’t think it’s splitting hairs? It seems like running most nix commands is failing because of some issue because of some libcurl bug and their netrc-file setting