Commits on Dec 21, 2019

1. Add an optional hash parameter to builtins.fetchGit …

   This is particularly useful to ensure the purity e.g. of a repo which is
   pinned to a git tag (tags can be force-pushed which makes builds silently irreproducible)
   or when trying to evaluate a nix expression without internet connectivity (if the
   cache-entry is expired, the eval will break as the git repo can't be re-fetched).
   
   This change adds an optional `hash` parameter (with an SRI-hash[1]) to the builtin
   `fetchGit` and checks if there's a content-addressable path which matches the hash
   (the hash can be determined using `nix to-sri --type sha256 $(nix-prefetch-git ...)`).
   
   If no such path exists, it will be attempted to fetch the Git repository in
   order to compare the hashes. Please note that caching is still used here, so
   if the repo is already fetched and the only hash in the expression changes,
   the evaluation will fail pretty fast.
   
   [1] https://www.w3.org/TR/SRI/

   

   Ma27 committed Dec 21, 2019
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