[Nix-dev] nix-hash/NAR specification?

[Kamil Chmielewski]

Hi,

I want to write simple tool to convert golang environments into Nix
derivations. Something that I can use same way as godep but producing Nix
derivation, similar to those created with go2nix.
I implemented small PoC that reads all packages from $GOPATH/src to
discover theirs repos and current revisions.
One final thing I need is package hash. I don't want to use nix-prefetch
because I  already have all sources there. I can't run nix-hash on sources
with .git directories in it.
I thought I can write nix-hash in Go to keep my code self-contained and
concise.
I found https://gist.github.com/jbeda/5c79d2b1434f0018d693 and saw Eelco
PhD thesis but I don't know if it's still valid?
So there's my question :) Is there any official nix-hash/NAR specification
that I can use?
Is nix-hash just a checksum of path archived with NAR?

Cheers,
Kamil
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