diff options
| -rw-r--r-- | src/libexpr/primops.cc | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc index d458ab272..de04fd2be 100644 --- a/src/libexpr/primops.cc +++ b/src/libexpr/primops.cc @@ -719,7 +719,13 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * * throw Error(format("multiple outputs are not supported in fixed-output derivations, at %1%") % posDrvName); HashType ht = outputHashAlgo.empty() ? htUnknown : parseHashType(outputHashAlgo); - Hash h(*outputHash, ht); + + Hash h; + if (outputHash->empty()) { + h = Hash(ht); + printError("warning: found empty hash, assuming you wanted '%s'", h.to_string()); + } else + h = Hash(*outputHash, ht); auto outPath = state.store->makeFixedOutputPath(ingestionMethod, h, drvName); if (!jsonObject) drv.env["out"] = state.store->printStorePath(outPath); |