Git URLs are missing the host in flake.lock

[erictapen]

Observed

I have this simple flake.nix:

{
  edition = 201909;

  description = "Reproduce a bug";

  inputs = {
    nixos-mailserver = {
      type = "git";
      url = "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver.git";
      flake = false;
    };
  };

  outputs = { self, nixos-mailserver }: rec {

    packages.x86_64-linux.test = builtins.derivation {
      name = "hello";
      system = "x86_64-linux";
      builder = "/bin/sh";
      args = [ "-c" "echo \"${nixos-mailserver}\" > $out" ];
    };
    defaultPackage.x86_64-linux = packages.x86_64-linux.test;

  };

}

Running the latest commit from the flakes branch, I get the following flake.lock when running nix flake update --recreate-lock-file:

{
  "inputs": {
    "nixos-mailserver": {
      "info": {
        "lastModified": 1576658032,
        "narHash": "sha256-Ka8FeMF6S9RXLUh8gB3CZiYTdu9Fh3Vwp3EI15PJ3Ag=",
        "revCount": 400
      },
      "inputs": {},
      "locked": {
        "ref": "master",
        "rev": "7bda4c4f110da5134ef9de5efe5d7e6f66bab6e6",
        "type": "git",
        "url": "https:///simple-nixos-mailserver/nixos-mailserver.git"
      },
      "original": {
        "type": "git",
        "url": "https:///simple-nixos-mailserver/nixos-mailserver.git"
      }
    }
  },
  "version": 4
}

Notice the missing gitlab.com in the URLs. This is of course causing a build failure later in the process.

Expected

The URL should contain gitlab.com. I should at least get an error, if I'm doing it something wrong in flake.nix.

[erictapen]

Thanks!