Can I get a flake input locked ref in the outputs scope?

Help
1

In a flake that I am developing, I built a bash script that calls:

nix flake new "${NAME}" --template "${TEMPLATE}"

Today I hard code the TEMPLATE variable with something like:

git+ssh://git@gitlab.com/mygroup/myrepo?ref=main&rev=99727ebe33e443d42eacad2434b349c95d7274f4#mytemplate

As you can see I manually pin the version of the template that I need, but I would like to leverage the lock file to do that instead.

So I added an input to my flake:

{
  inputs = {
    ...
    myinput = {
      url = git+ssh://git@gitlab.com/mygroup/myrepo?ref=main;
    };
  };

  outputs = { self, myinput, ... }: {
    ...
    # How to get the input locked ref in here?
  }
}

Can I get the input locked ref (i.e. “git+ssh://git@gitlab.com/mygroup/myrepo?ref=main&rev=99727ebe33e443d42eacad2434b349c95d7274f4”)—if that is what it’s called—in the outputs scope?

I know I can get the hash with myinput.rev and I could easily built the final string with this, but I would like the complete “git+ssh://git@gitlab.com/mygroup/myrepo?ref=main&rev=99727ebe33e443d42eacad2434b349c95d7274f4” without having to duplicate the knowledge of the rest of the input data (repo git@gitlab.com/mygroup/myrepo and branch (i.e. main).

2

By leveraging rec, I can do:

rec {
  inputs = {
    ...
    myinput = {
      url = git+ssh://git@gitlab.com/mygroup/myrepo?ref=main;
    };
  };

  outputs = { self, myinput, ... }: {
    ...
    template = "${inputs.myinput.url}&rev=${myinput.rev}#mytemplate";
  }
}