`users.users.<name>.autoSubUidGidRange = true` creates overlapping Ids for normal and system users

[ppenguin]

Describe the bug

Setting users.users.<name>.autoSubUidGidRange = true for a few normal and a few system users creates overlapping Ids, where it appears that the "counter" starts at the beginning for the system and normal user category.

Steps To Reproduce

Steps to reproduce the behavior:

1. Set users.users.<name>.autoSubUidGidRange = true for a few normal users
2. Set users.users.<name>.autoSubUidGidRange = true for a few system users
3. Observe overlapping IDs in /etc/sub*id

Expected behavior

ID ranges count linearly to avoid overlap, considering both system and normal users the same.

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Additional context

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Metadata

Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

[user@system:~]$ nix-shell -p nix-info --run "nix-info -m"
nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 6.5.5-zen1, NixOS, 23.11 (Tapir), 23.11.20231004.7131f3c`
 - multi-user?: `yes`
 - sandbox: `relaxed`
 - version: `nix-env (Nix) 2.17.0`
 - nixpkgs: `/nix/store/hcdnrkjkrm30lg62aakdiah076iwjxhl-9gzb6bb0ghi5njm63sghyl7ia47n1ncn-source`

[ppenguin]

I noticed that here (https://github.com/NixOS/nixpkgs/blob/81e8f48ebdecf07aab321182011b067aafc78896/nixos/modules/config/users-groups.nix#L355C27-L355C27) the default for normal users is to generate sub*ids if none are specified and not explicitly disabled, which is ok (most system users wouldn't need to run podman), but I coundn't find where the actual generation script resides...

[WinstonHartnett]

Yep, ran into this too. The bit that updates user info is here by calling this perl script.