Use all-cabal-nixes to improve IFD speed a little#65
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This PR adds a new argument to stacklock2nix:
all-cabal-nixes.This argument takes a derivation providing the
all-cabal-nixesrepo. This repo is the result of runningcabal2nixon all the.cabalfiles inall-cabal-hashes.stacklock2nix internally calls
callHackageon all the dependencies coming from Hackage (for instance deps from both the Stackage resolver as well asextra-deps). Usingall-cabal-nixescan eliminate the need forcallHackage` and (some?) IFD.See the CHANGELOG and new documentation in this PR for more info.
This is related to #41.
This also uses @lf-'s
some-cabal-hashesidea from https://jade.fyi/blog/nix-evaluation-blocking/ to collect all thecabal2nixoutput for the given Stackage resolver and extra-deps into a separate derivation. This enables initial builds with a shared Nix cache to be a little quicker, since only this newsome-cabal-nixesneeds to be downloaded from the cache (instead of the fullall-cabal-nixesorall-cabal-hashes).