Unable to switch to the latest generation on unstable

[iopq]

Describe the bug

When I updated my flake and tried to switch to the new generation, it failed with

[iopq@desktop:~]$ sudo nixos-rebuild switch
[sudo] password for iopq: 
warning: Git tree '/etc/nixos' is dirty
building the system configuration...
warning: Git tree '/etc/nixos' is dirty
evaluation warning: qt6Packages.stdenv is deprecated. Use stdenv instead.
terminate called after throwing an instance of 'nix::Error'
  what():  error: cannot determine user's home directory
Traceback (most recent call last):
  File "/nix/store/sk24hzhak6cy37g7yq9yyb6c93csjv7s-systemd-boot/bin/systemd-boot", line 431, in <module>
    main()
  File "/nix/store/sk24hzhak6cy37g7yq9yyb6c93csjv7s-systemd-boot/bin/systemd-boot", line 414, in main
    install_bootloader(args)
  File "/nix/store/sk24hzhak6cy37g7yq9yyb6c93csjv7s-systemd-boot/bin/systemd-boot", line 357, in install_bootloader
    gens = get_generations()
           ^^^^^^^^^^^^^^^^^
  File "/nix/store/sk24hzhak6cy37g7yq9yyb6c93csjv7s-systemd-boot/bin/systemd-boot", line 213, in get_generations
    gen_list = run(
               ^^^^
  File "/nix/store/sk24hzhak6cy37g7yq9yyb6c93csjv7s-systemd-boot/bin/systemd-boot", line 58, in run
    return subprocess.run(cmd, check=True, text=True, stdout=stdout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/c9m6yd8fg1flz2j5r4bif1ib5j20a0cy-python3-3.12.8/lib/python3.12/subprocess.py", line 571, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['/nix/store/w6wybyfakrgnp1rb0mrj66xlj8118z8c-nix-2.24.11/bin/nix-env', '--list-generations', '-p', '/nix/var/nix/profiles/system']' died with <Signals.SIGABRT: 6>.
Failed to install bootloader

Steps To Reproduce

sudo nixos-rebuild switch

Expected behavior

switch should succeed

Metadata

nix-env (Nix) 2.24.11

sudo /nix/store/w6wybyfakrgnp1rb0mrj66xlj8118z8c-nix-2.24.11/bin/nix-env --list-generations -p /nix/var/nix/profiles/system

returns a list of generations

• checked latest Nix manual (source)
• checked open bug issues and pull requests for possible duplicates

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[iopq]

the command that fails is

sudo 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/y93s787hifig9pf2z4w8h1x4a5cwmqwp-nixos-system-desktop-25.05.20250104.8f3e1f8/bin/switch-to-configuration switch

I manually ran

sudo /nix/store/y93s787hifig9pf2z4w8h1x4a5cwmqwp-nixos-system-desktop-25.05.20250104.8f3e1f8/bin/switch-to-configuration switch

then everything worked again for a bit, and then failed again when I changed the configuration

nix-profile also has some errors

[iopq]

nix shell gives this error

[iopq@desktop:~]$ nix-shell -p nvtop
error:
       … while calling the 'import' builtin
         at «string»:1:18:
            1| {...}@args: with import <nixpkgs> args; (pkgs.runCommandCC or pkgs.runCommand) "shell" { buildInputs = [ (nvtop) ]; } ""
             |                  ^

       … while realising the context of a path

       … while calling the 'findFile' builtin
         at «string»:1:25:
            1| {...}@args: with import <nixpkgs> args; (pkgs.runCommandCC or pkgs.runCommand) "shell" { buildInputs = [ (nvtop) ]; } ""
             |                         ^

       error: cannot connect to socket at '/nix/var/nix/daemon-socket/socket': Connection refused

[iopq]

The issue is somehow my entire /nix folder is owned by another user which runs the proxy program which causes
every permission problem possible

after i chowned some folders I got a new error message:

terminate called after throwing an instance of 'nix::Error'
  what():  error: cannot determine user's home directory
/run/current-system/sw/bin/nixos-rebuild: line 216:  8058 Aborted                 (core dumped) "$@"