Merge pull request #3859 from obsidiansystems/drv-outputs-map-allow-missing

`queryDerivationOutputMap` no longer assumes all outputs have a mapping
This commit is contained in:
Eelco Dolstra 2020-08-20 16:49:23 +02:00 committed by GitHub
commit 4d77513d97
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 142 additions and 37 deletions

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@ -2756,8 +2756,12 @@ struct RestrictedStore : public LocalFSStore
void queryReferrers(const StorePath & path, StorePathSet & referrers) override
{ }
OutputPathMap queryDerivationOutputMap(const StorePath & path) override
{ throw Error("queryDerivationOutputMap"); }
std::map<std::string, std::optional<StorePath>> queryPartialDerivationOutputMap(const StorePath & path) override
{
if (!goal.isAllowed(path))
throw InvalidPath("cannot query output map for unknown path '%s' in recursive Nix", printStorePath(path));
return next->queryPartialDerivationOutputMap(path);
}
std::optional<StorePath> queryPathFromHashPart(const std::string & hashPart) override
{ throw Error("queryPathFromHashPart"); }
@ -4983,7 +4987,7 @@ void Worker::waitForInput()
std::vector<unsigned char> buffer(4096);
for (auto & k : fds2) {
if (pollStatus.at(fdToPollStatus.at(k)).revents) {
ssize_t rd = read(k, buffer.data(), buffer.size());
ssize_t rd = ::read(k, buffer.data(), buffer.size());
// FIXME: is there a cleaner way to handle pt close
// than EIO? Is this even standard?
if (rd == 0 || (rd == -1 && errno == EIO)) {

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@ -325,9 +325,9 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
case wopQueryDerivationOutputMap: {
auto path = store->parseStorePath(readString(from));
logger->startWork();
OutputPathMap outputs = store->queryDerivationOutputMap(path);
auto outputs = store->queryPartialDerivationOutputMap(path);
logger->stopWork();
writeOutputPathMap(*store, to, outputs);
worker_proto::write(*store, to, outputs);
break;
}

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@ -785,17 +785,21 @@ StorePathSet LocalStore::queryValidDerivers(const StorePath & path)
}
OutputPathMap LocalStore::queryDerivationOutputMap(const StorePath & path)
std::map<std::string, std::optional<StorePath>> LocalStore::queryPartialDerivationOutputMap(const StorePath & path)
{
return retrySQLite<OutputPathMap>([&]() {
std::map<std::string, std::optional<StorePath>> outputs;
BasicDerivation drv = readDerivation(path);
for (auto & [outName, _] : drv.outputs) {
outputs.insert_or_assign(outName, std::nullopt);
}
return retrySQLite<std::map<std::string, std::optional<StorePath>>>([&]() {
auto state(_state.lock());
auto useQueryDerivationOutputs(state->stmtQueryDerivationOutputs.use()
(queryValidPathId(*state, path)));
OutputPathMap outputs;
while (useQueryDerivationOutputs.next())
outputs.emplace(
outputs.insert_or_assign(
useQueryDerivationOutputs.getStr(0),
parseStorePath(useQueryDerivationOutputs.getStr(1))
);

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@ -133,7 +133,7 @@ public:
StorePathSet queryValidDerivers(const StorePath & path) override;
OutputPathMap queryDerivationOutputMap(const StorePath & path) override;
std::map<std::string, std::optional<StorePath>> queryPartialDerivationOutputMap(const StorePath & path) override;
std::optional<StorePath> queryPathFromHashPart(const std::string & hashPart) override;

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@ -31,7 +31,6 @@ template<> StorePathSet readStorePaths(const Store & store, Source & from)
return paths;
}
void writeStorePaths(const Store & store, Sink & out, const StorePathSet & paths)
{
out << paths.size();
@ -39,6 +38,7 @@ void writeStorePaths(const Store & store, Sink & out, const StorePathSet & paths
out << store.printStorePath(i);
}
StorePathCAMap readStorePathCAMap(const Store & store, Source & from)
{
StorePathCAMap paths;
@ -57,30 +57,36 @@ void writeStorePathCAMap(const Store & store, Sink & out, const StorePathCAMap &
}
}
std::map<string, StorePath> readOutputPathMap(const Store & store, Source & from)
namespace worker_proto {
StorePath read(const Store & store, Source & from, Phantom<StorePath> _)
{
std::map<string, StorePath> pathMap;
auto rawInput = readStrings<Strings>(from);
if (rawInput.size() % 2)
throw Error("got an odd number of elements from the daemon when trying to read a output path map");
auto curInput = rawInput.begin();
while (curInput != rawInput.end()) {
auto thisKey = *curInput++;
auto thisValue = *curInput++;
pathMap.emplace(thisKey, store.parseStorePath(thisValue));
}
return pathMap;
return store.parseStorePath(readString(from));
}
void writeOutputPathMap(const Store & store, Sink & out, const std::map<string, StorePath> & pathMap)
void write(const Store & store, Sink & out, const StorePath & storePath)
{
out << 2*pathMap.size();
for (auto & i : pathMap) {
out << i.first;
out << store.printStorePath(i.second);
}
out << store.printStorePath(storePath);
}
template<>
std::optional<StorePath> read(const Store & store, Source & from, Phantom<std::optional<StorePath>> _)
{
auto s = readString(from);
return s == "" ? std::optional<StorePath> {} : store.parseStorePath(s);
}
template<>
void write(const Store & store, Sink & out, const std::optional<StorePath> & storePathOpt)
{
out << (storePathOpt ? store.printStorePath(*storePathOpt) : "");
}
}
/* TODO: Separate these store impls into different files, give them better names */
RemoteStore::RemoteStore(const Params & params)
: Store(params)
@ -468,12 +474,12 @@ StorePathSet RemoteStore::queryDerivationOutputs(const StorePath & path)
}
OutputPathMap RemoteStore::queryDerivationOutputMap(const StorePath & path)
std::map<std::string, std::optional<StorePath>> RemoteStore::queryPartialDerivationOutputMap(const StorePath & path)
{
auto conn(getConnection());
conn->to << wopQueryDerivationOutputMap << printStorePath(path);
conn.processStderr();
return readOutputPathMap(*this, conn->from);
return worker_proto::read(*this, conn->from, Phantom<std::map<std::string, std::optional<StorePath>>> {});
}

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@ -51,7 +51,7 @@ public:
StorePathSet queryDerivationOutputs(const StorePath & path) override;
OutputPathMap queryDerivationOutputMap(const StorePath & path) override;
std::map<std::string, std::optional<StorePath>> queryPartialDerivationOutputMap(const StorePath & path) override;
std::optional<StorePath> queryPathFromHashPart(const std::string & hashPart) override;
StorePathSet querySubstitutablePaths(const StorePathSet & paths) override;

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@ -359,6 +359,17 @@ bool Store::PathInfoCacheValue::isKnownNow()
return std::chrono::steady_clock::now() < time_point + ttl;
}
OutputPathMap Store::queryDerivationOutputMap(const StorePath & path) {
auto resp = queryPartialDerivationOutputMap(path);
OutputPathMap result;
for (auto & [outName, optOutPath] : resp) {
if (!optOutPath)
throw Error("output '%s' has no store path mapped to it", outName);
result.insert_or_assign(outName, *optOutPath);
}
return result;
}
StorePathSet Store::queryDerivationOutputs(const StorePath & path)
{
auto outputMap = this->queryDerivationOutputMap(path);

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@ -343,9 +343,15 @@ public:
/* Query the outputs of the derivation denoted by `path'. */
virtual StorePathSet queryDerivationOutputs(const StorePath & path);
/* Query the mapping outputName=>outputPath for the given derivation */
virtual OutputPathMap queryDerivationOutputMap(const StorePath & path)
{ unsupported("queryDerivationOutputMap"); }
/* Query the mapping outputName => outputPath for the given derivation. All
outputs are mentioned so ones mising the mapping are mapped to
`std::nullopt`. */
virtual std::map<std::string, std::optional<StorePath>> queryPartialDerivationOutputMap(const StorePath & path)
{ unsupported("queryPartialDerivationOutputMap"); }
/* Query the mapping outputName=>outputPath for the given derivation.
Assume every output has a mapping and throw an exception otherwise. */
OutputPathMap queryDerivationOutputMap(const StorePath & path);
/* Query the full store path given the hash part of a valid store
path, or empty if the path doesn't exist. */

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@ -70,10 +70,84 @@ template<class T> T readStorePaths(const Store & store, Source & from);
void writeStorePaths(const Store & store, Sink & out, const StorePathSet & paths);
/* To guide overloading */
template<typename T>
struct Phantom {};
namespace worker_proto {
/* FIXME maybe move more stuff inside here */
StorePath read(const Store & store, Source & from, Phantom<StorePath> _);
void write(const Store & store, Sink & out, const StorePath & storePath);
template<typename T>
std::map<std::string, T> read(const Store & store, Source & from, Phantom<std::map<std::string, T>> _);
template<typename T>
void write(const Store & store, Sink & out, const std::map<string, T> & resMap);
template<typename T>
std::optional<T> read(const Store & store, Source & from, Phantom<std::optional<T>> _);
template<typename T>
void write(const Store & store, Sink & out, const std::optional<T> & optVal);
/* Specialization which uses and empty string for the empty case, taking
advantage of the fact StorePaths always serialize to a non-empty string.
This is done primarily for backwards compatability, so that StorePath <=
std::optional<StorePath>, where <= is the compatability partial order.
*/
template<>
void write(const Store & store, Sink & out, const std::optional<StorePath> & optVal);
template<typename T>
std::map<std::string, T> read(const Store & store, Source & from, Phantom<std::map<std::string, T>> _)
{
std::map<string, T> resMap;
auto size = (size_t)readInt(from);
while (size--) {
auto thisKey = readString(from);
resMap.insert_or_assign(std::move(thisKey), nix::worker_proto::read(store, from, Phantom<T> {}));
}
return resMap;
}
template<typename T>
void write(const Store & store, Sink & out, const std::map<string, T> & resMap)
{
out << resMap.size();
for (auto & i : resMap) {
out << i.first;
nix::worker_proto::write(store, out, i.second);
}
}
template<typename T>
std::optional<T> read(const Store & store, Source & from, Phantom<std::optional<T>> _)
{
auto tag = readNum<uint8_t>(from);
switch (tag) {
case 0:
return std::nullopt;
case 1:
return nix::worker_proto::read(store, from, Phantom<T> {});
default:
throw Error("got an invalid tag bit for std::optional: %#04x", tag);
}
}
template<typename T>
void write(const Store & store, Sink & out, const std::optional<T> & optVal)
{
out << (optVal ? 1 : 0);
if (optVal)
nix::worker_proto::write(store, out, *optVal);
}
}
StorePathCAMap readStorePathCAMap(const Store & store, Source & from);
void writeStorePathCAMap(const Store & store, Sink & out, const StorePathCAMap & paths);
void writeOutputPathMap(const Store & store, Sink & out, const OutputPathMap & paths);
}