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Derivations can output "text-hashed" data

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In particular, this means that derivations can output derivations. But
that ramification isn't (yet!) useful as we would want, since there is
no way to have a dependent derivation that is itself a dependent
derivation.
This commit is contained in:
John Ericson 2020-10-12 23:51:23 +00:00
parent a0f369aa3f
commit a4e5de1b9d
15 changed files with 322 additions and 137 deletions
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11
src/libstore/daemon.cc
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@ -380,20 +380,23 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
logger->startWork();
auto pathInfo = [&]() {
// NB: FramedSource must be out of scope before logger->stopWork();
ContentAddressMethod contentAddressMethod = parseContentAddressMethod(camStr);
auto [contentAddressMethod, hashType] = parseContentAddressMethod(camStr);
FramedSource source(from);
// TODO this is essentially RemoteStore::addCAToStore. Move it up to Store.
return std::visit(overloaded {
[&](TextHashMethod &_) {
[&](TextHashMethod _) {
if (hashType != htSHA256)
throw UnimplementedError("Only SHA-256 is supported for adding text-hashed data, but '%1' was given",
printHashType(hashType));
// We could stream this by changing Store
std::string contents = source.drain();
auto path = store->addTextToStore(name, contents, refs, repair);
return store->queryPathInfo(path);
},
[&](FixedOutputHashMethod &fohm) {
[&](FileIngestionMethod fim) {
if (!refs.empty())
throw UnimplementedError("cannot yet have refs with flat or nar-hashed data");
auto path = store->addToStoreFromDump(source, name, fohm.fileIngestionMethod, fohm.hashType, repair);
auto path = store->addToStoreFromDump(source, name, fim, hashType, repair);
return store->queryPathInfo(path);
},
}, contentAddressMethod);