{
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        "description": "Mozilla overlay for Nixpkgs.",
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        "owner": "mozilla",
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        "type": "tarball",
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        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    },
    "niv": {
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        "description": "Easy dependency management for Nix projects",
        "homepage": "https://github.com/nmattia/niv",
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        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
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    "nixpkgs": {
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        "description": "Nix Packages collection",
        "homepage": "",
        "owner": "NixOS",
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}