weird_derivation.nix

{
### THIS WORKS
  # Fetches a package from a github repo.
  fetchRepo = {repo, name, version, sha256}:
    let
      github_token = builtins.getEnv "GITHUB_TOKEN";
      url = "https://api.github.com/repos/adnelson/${repo}/tarball/${name}%2F${version}";
      curlCmd = "curl --fail -fL -H 'Authorization: token ${github_token}'";
    in
    pkgs.stdenv.mkDerivation {
      name = "${repo}-${name}-${version}-snapshot.tar.gz";
      buildInputs = [pkgs.curl pkgs.cacert];
      phases = ["buildPhase"];
      CURL_CA_BUNDLE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
      buildPhase = ''
        ${curlCmd} ${url} > $out
      '';
      outputHash = sha256;
      outputHashAlgo = "sha256";
      outputHashMode = "flat";
    };

  # Uses the repo fetched from `fetchRepo` to pull the package source out.
  fetchPathInRepo = {repo, pathInRepo, name, version, sha256}:
    let
      fetchedRepo = fetchRepo {inherit repo name version sha256;};
    in
    pkgs.runCommand "${name}-${version}-folder" {} ''
      tar -xf ${fetchedRepo}
      cp -r adnelson-${repo}-*/${pathInRepo} $out
    '';
    
    

### THIS FAILS
  # Fetches a package from a github repo.
  fetchRepo = {repo, name, version, sha256}:
    let
      github_token = builtins.getEnv "GITHUB_TOKEN";
      url = "https://api.github.com/repos/adnelson/${repo}/tarball/${name}%2F${version}";
      curlCmd = "curl --fail -fL -H 'Authorization: token ${github_token}'";
    in
    pkgs.stdenv.mkDerivation {
      name = "${repo}-${name}-${version}-snapshot.tar.gz";
      buildInputs = [pkgs.curl pkgs.cacert];
      phases = ["buildPhase"];
      CURL_CA_BUNDLE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
      buildPhase = ''
        ${curlCmd} ${url} > $out
      '';
      outputHash = sha256;
      outputHashAlgo = "sha256";
      outputHashMode = "flat";
    };

  # Uses the repo fetched from `fetchRepo` to pull the package source out.
  fetchPathInRepo = {repo, pathInRepo, name, version, sha256}:
    let
      fetchedRepo = fetchRepo {inherit repo name version sha256;};
    in
    pkgs.runCommand "${name}-${version}-folder" {
      buildInputs = [fetchedRepo];
    } ''
      tar -xf ${fetchedRepo}
      cp -r adnelson-${repo}-*/${pathInRepo} $out
    '';
    
}