At some points people mentionned that it could be possible to implement a tool that fake git. For instance by pre-recording git outputs and playing them in a dummy executable. It may even be possible to semi-automate the process by generating a json file while compiling in a nix shell, and then reuse this in the derivation, but it may be a bit annoying to do everytime we upgrade the package. At least the hash of the derivation is guaranteed to never shift.
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