hashFile

lib.filesystem.hashFile

Primop

Docs pulled from | This Revision | 12 minutes ago

Nix manual

Takes 2 arguments

type, p

Return a base-16 representation of the cryptographic hash of the file at path p. The hash algorithm specified by type must be one of "md5", "sha1", "sha256" or "sha512".

Noogle detected

Aliases

Detected Type

hashFile :: String -> Path -> String

Implementation

This function is implemented in c++ and is part of the native nix runtime.

src/libexpr/primops.cc:2349

static void prim_hashFile(EvalState & state, const PosIdx pos, Value ** args, Value & v)
{
    auto algo =
        state.forceStringNoCtx(*args[0], pos, "while evaluating the first argument passed to builtins.hashFile");
    std::optional<HashAlgorithm> ha = parseHashAlgo(algo);
    if (!ha)
        state.error<EvalError>("unknown hash algorithm '%1%'", algo).atPos(pos).debugThrow();

    auto path = state.realisePath(pos, *args[1]);

    v.mkString(hashString(*ha, path.readFile()).to_string(HashFormat::Base16, false), state.mem);
}

Implementation

The following is the current implementation of this function.

hashFile