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buildRustCrate: document and cleanup the symbol seeding

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That code had been in the derivation for a while but no explanation was
given why that is needed. It might be helpful to our future selfs to
document why things are done the way they are.
This commit is contained in:
Andreas Rammhold 2019-12-11 22:59:19 +01:00
parent db55d1f89d
commit f4aeabd04a
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1 changed files with 7 additions and 2 deletions
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9
pkgs/build-support/rust/build-rust-crate/default.nix
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@ -93,8 +93,13 @@ stdenv.mkDerivation (rec {
libName = if crate ? libName then crate.libName else crate.crateName;
libPath = if crate ? libPath then crate.libPath else "";
depsMetadata = lib.foldl' (str: dep: str + dep.metadata) "" (dependencies ++ buildDependencies);
metadata = lib.substring 0 10 (builtins.hashString "sha256" (crateName + "-" + crateVersion + "___" + toString crateFeatures + "___" + depsMetadata ));
# Seed the symbol hashes with something unique every time.
# https://doc.rust-lang.org/1.0.0/rustc/metadata/loader/index.html#frobbing-symbols
metadata = let
depsMetadata = lib.foldl' (str: dep: str + dep.metadata) "" (dependencies ++ buildDependencies);
hashedMetadata = builtins.hashString "sha256"
(crateName + "-" + crateVersion + "___" + toString crateFeatures + "___" + depsMetadata);
in lib.substring 0 10 hashedMetadata;
crateBin = if crate ? crateBin then
lib.foldl' (bins: bin: let