`useFetchCargoVendor` doesn't seem to respect `cargoRoot`?

[griffi-gh]

Describe the bug

useFetchCargoVendor tries to look up Cargo.lock in sourceRoot rather than sourceRoot/cargoRoot

Steps To Reproduce

Steps to reproduce the behavior:

1. Create a package using rustPlatform.buildRustPackage, set cargoRoot to a subdir containing the Cargo.lock file

Expected behavior

Cargo.lock should be looked up in $sourceRoot/$cargoRoot

Screenshots

N/A

Additional context

N/A

Metadata

• system: "x86_64-linux"
• host os: Linux 6.11.5-zen1, NixOS, 25.05 (Warbler), 25.05.20241115.5e4fbfb
• multi-user?: yes
• sandbox: yes
• version: nix-env (Lix, like Nix) 2.91.1 System type: x86_64-linux Additional system types: i686-linux, x86_64-v1-linux, x86_64-v2-linux, x86_64-v3-linux Features: gc, signed-caches System configuration file: /etc/nix/nix.conf User configuration files: /home/user/.config/nix/nix.conf:/nix/store/1c1x2ki3lz5k5nw5z0bl0glizgb0k0rb-plasma-workspace-6.2.3/etc/xdg/nix/nix.conf:/nix/store/ya7vhc1j80aq3vn643k2sq4i7c2vsqr1-kglobalacceld-6.2.3/etc/xdg/nix/nix.conf:/nix/store/pdgsrs8i0crldkl8n2cp9jx3h06rcnzc-baloo-6.8.0/etc/xdg/nix/nix.conf:/home/user/.config/kdedefaults/nix/nix.conf:/nix/store/1c1x2ki3lz5k5nw5z0bl0glizgb0k0rb-plasma-workspace-6.2.3/etc/xdg/nix/nix.conf:/nix/store/ya7vhc1j80aq3vn643k2sq4i7c2vsqr1-kglobalacceld-6.2.3/etc/xdg/nix/nix.conf:/nix/store/pdgsrs8i0crldkl8n2cp9jx3h06rcnzc-baloo-6.8.0/etc/xdg/nix/nix.conf:/nix/store/1c1x2ki3lz5k5nw5z0bl0glizgb0k0rb-plasma-workspace-6.2.3/etc/xdg/nix/nix.conf:/nix/store/ya7vhc1j80aq3vn643k2sq4i7c2vsqr1-kglobalacceld-6.2.3/etc/xdg/nix/nix.conf:/nix/store/pdgsrs8i0crldkl8n2cp9jx3h06rcnzc-baloo-6.8.0/etc/xdg/nix/nix.conf:/home/user/.config/kdedefaults/nix/nix.conf:/etc/xdg/nix/nix.conf:/home/user/.local/share/flatpak/exports/etc/xdg/nix/nix.conf:/var/lib/flatpak/exports/etc/xdg/nix/nix.conf:/home/user/.nix-profile/etc/xdg/nix/nix.conf:/nix/profile/etc/xdg/nix/nix.conf:/home/user/.local/state/nix/profile/etc/xdg/nix/nix.conf:/etc/profiles/per-user/user/etc/xdg/nix/nix.conf:/nix/var/nix/profiles/default/etc/xdg/nix/nix.conf:/run/current-system/sw/etc/xdg/nix/nix.conf Store directory: /nix/store State directory: /nix/var/nix Data directory: /nix/store/kqpjnkkpv1drbnvrqbhnyd2ixy9dymzb-lix-2.91.1/share
• nixpkgs: /nix/store/hfz1qqd0z8amlgn8qwich1dvkmldik36-source

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[griffi-gh]

350541

[TomaSajt]

Keeping this open for better visibility. Will close when the PR is merged.