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importPaths(): Optionally add NARs to binary cache accessor

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This enables an optimisation in hydra-queue-runner, preventing a
download of a NAR it just uploaded to the cache when reading files
like hydra-build-products.
This commit is contained in:
Eelco Dolstra 2016-02-26 15:20:10 +01:00
parent 1042c10fd0
commit bcc9943cee
10 changed files with 58 additions and 44 deletions
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66
src/libstore/binary-cache-store.cc
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@ -183,7 +183,8 @@ void BinaryCacheStore::exportPath(const Path & storePath, bool sign, Sink & sink
sink << exportMagic << storePath << res.references << res.deriver << 0;
}
Paths BinaryCacheStore::importPaths(bool requireSignature, Source & source)
Paths BinaryCacheStore::importPaths(bool requireSignature, Source & source,
std::shared_ptr<FSAccessor> accessor)
{
assert(!requireSignature);
Paths res;
@ -191,7 +192,7 @@ Paths BinaryCacheStore::importPaths(bool requireSignature, Source & source)
unsigned long long n = readLongLong(source);
if (n == 0) break;
if (n != 1) throw Error("input doesn't look like something created by ‘nix-store --export’");
res.push_back(importPath(source));
res.push_back(importPath(source, accessor));
}
return res;
}
@ -215,34 +216,6 @@ struct NopSink : ParseSink
{
};
Path BinaryCacheStore::importPath(Source & source)
{
/* FIXME: some cut&paste of LocalStore::importPath(). */
/* Extract the NAR from the source. */
TeeSource tee(source);
NopSink sink;
parseDump(sink, tee);
uint32_t magic = readInt(source);
if (magic != exportMagic)
throw Error("Nix archive cannot be imported; wrong format");
ValidPathInfo info;
info.path = readStorePath(source);
info.references = readStorePaths<PathSet>(source);
readString(source); // deriver, don't care
bool haveSignature = readInt(source) == 1;
assert(!haveSignature);
addToCache(info, tee.data);
return info.path;
}
ValidPathInfo BinaryCacheStore::queryPathInfo(const Path & storePath)
{
return ValidPathInfo(readNarInfo(storePath));
@ -416,4 +389,37 @@ ref<FSAccessor> BinaryCacheStore::getFSAccessor()
std::dynamic_pointer_cast<BinaryCacheStore>(shared_from_this())));
}
Path BinaryCacheStore::importPath(Source & source, std::shared_ptr<FSAccessor> accessor)
{
/* FIXME: some cut&paste of LocalStore::importPath(). */
/* Extract the NAR from the source. */
TeeSource tee(source);
NopSink sink;
parseDump(sink, tee);
uint32_t magic = readInt(source);
if (magic != exportMagic)
throw Error("Nix archive cannot be imported; wrong format");
ValidPathInfo info;
info.path = readStorePath(source);
info.references = readStorePaths<PathSet>(source);
readString(source); // deriver, don't care
bool haveSignature = readInt(source) == 1;
assert(!haveSignature);
addToCache(info, tee.data);
auto accessor_ = std::dynamic_pointer_cast<BinaryCacheStoreAccessor>(accessor);
if (accessor_)
// FIXME: more gratuitous string copying
accessor_->nars.emplace(info.path, makeNarAccessor(make_ref<std::string>(tee.data)));
return info.path;
}
}