nixos-config/nix/sources.json

{
    "home-manager": {
        "branch": "release-23.11",
        "description": "Manage a user environment using Nix  [maintainer=@rycee] ",
        "homepage": "https://nix-community.github.io/home-manager/",
        "owner": "nix-community",
        "repo": "home-manager",
        "rev": "aeb2232d7a32530d3448318790534d196bf9427a",
        "sha256": "16078fwcmqq41dqfnm124xxm8l6zykvqlj1kzgi0fvfil4y86slm",
        "type": "tarball",
        "url": "https://github.com/nix-community/home-manager/archive/aeb2232d7a32530d3448318790534d196bf9427a.tar.gz",
        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    },
    "niv": {
        "branch": "master",
        "description": "Easy dependency management for Nix projects",
        "homepage": "https://github.com/nmattia/niv",
        "owner": "nmattia",
        "repo": "niv",
        "rev": "7b76374b2b44152bfbf41fcb60162c2ce9182e7a",
        "sha256": "1ql11hzgxdahj9x0b20b70izcmayb22rinrg82kgp5z19bvpsgrp",
        "type": "tarball",
        "url": "https://github.com/nmattia/niv/archive/7b76374b2b44152bfbf41fcb60162c2ce9182e7a.tar.gz",
        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    }
}