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StorePath: Rewrite in C++

Browse source 
On nix-env -qa -f '<nixpkgs>', this reduces maximum RSS by 20970 KiB
and runtime by 0.8%. This is mostly because we're not parsing the hash
part as a hash anymore (just validating that it consists of base-32
characters).

Also, replace storePathToHash() by StorePath::hashPart().
This commit is contained in:
Eelco Dolstra 2020-06-16 14:16:39 +02:00
parent 72e17290d4
commit 759947bf72
21 changed files with 110 additions and 111 deletions
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1
Makefile
View file

@ -1,7 +1,6 @@
makefiles = \
mk/precompiled-headers.mk \
local.mk \
nix-rust/local.mk \
src/libutil/local.mk \
src/libutil/tests/local.mk \
src/libstore/local.mk \

2
src/libexpr/local.mk
View file

@ -8,7 +8,7 @@ libexpr_SOURCES := $(wildcard $(d)/*.cc) $(wildcard $(d)/primops/*.cc) $(d)/lexe
libexpr_CXXFLAGS += -I src/libutil -I src/libstore -I src/libfetchers -I src/libmain -I src/libexpr
libexpr_LIBS = libutil libstore libfetchers libnixrust
libexpr_LIBS = libutil libstore libfetchers
libexpr_LDFLAGS =
ifneq ($(OS), FreeBSD)

2
src/libfetchers/local.mk
View file

@ -8,4 +8,4 @@ libfetchers_SOURCES := $(wildcard $(d)/*.cc)
libfetchers_CXXFLAGS += -I src/libutil -I src/libstore
libfetchers_LIBS = libutil libstore libnixrust
libfetchers_LIBS = libutil libstore

6
src/libstore/binary-cache-store.cc
View file

@ -93,7 +93,7 @@ std::shared_ptr<std::string> BinaryCacheStore::getFile(const std::string & path)
std::string BinaryCacheStore::narInfoFileFor(const StorePath & storePath)
{
return storePathToHash(printStorePath(storePath)) + ".narinfo";
return std::string(storePath.hashPart()) + ".narinfo";
}
void BinaryCacheStore::writeNarInfo(ref<NarInfo> narInfo)
@ -102,7 +102,7 @@ void BinaryCacheStore::writeNarInfo(ref<NarInfo> narInfo)
upsertFile(narInfoFile, narInfo->to_string(*this), "text/x-nix-narinfo");
auto hashPart = storePathToHash(printStorePath(narInfo->path));
std::string hashPart(narInfo->path.hashPart());
{
auto state_(state.lock());
@ -164,7 +164,7 @@ void BinaryCacheStore::addToStore(const ValidPathInfo & info, Source & narSource
}
}
upsertFile(storePathToHash(printStorePath(info.path)) + ".ls", jsonOut.str(), "application/json");
upsertFile(std::string(info.path.to_string()) + ".ls", jsonOut.str(), "application/json");
}
/* Compress the NAR. */

10
src/libstore/local-store.cc
View file

@ -619,7 +619,7 @@ uint64_t LocalStore::addValidPath(State & state,
{
auto state_(Store::state.lock());
state_->pathInfoCache.upsert(storePathToHash(printStorePath(info.path)),
state_->pathInfoCache.upsert(std::string(info.path.hashPart()),
PathInfoCacheValue{ .value = std::make_shared<const ValidPathInfo>(info) });
}
@ -791,7 +791,7 @@ StorePathSet LocalStore::queryDerivationOutputs(const StorePath & path)
std::optional<StorePath> LocalStore::queryPathFromHashPart(const std::string & hashPart)
{
if (hashPart.size() != storePathHashLen) throw Error("invalid hash part");
if (hashPart.size() != StorePath::HashLen) throw Error("invalid hash part");
Path prefix = storeDir + "/" + hashPart;
@ -942,7 +942,7 @@ void LocalStore::invalidatePath(State & state, const StorePath & path)
{
auto state_(Store::state.lock());
state_->pathInfoCache.erase(storePathToHash(printStorePath(path)));
state_->pathInfoCache.erase(std::string(path.hashPart()));
}
}
@ -994,7 +994,7 @@ void LocalStore::addToStore(const ValidPathInfo & info, Source & source,
if (info.ca == "" || !info.references.count(info.path))
hashSink = std::make_unique<HashSink>(htSHA256);
else
hashSink = std::make_unique<HashModuloSink>(htSHA256, storePathToHash(printStorePath(info.path)));
hashSink = std::make_unique<HashModuloSink>(htSHA256, std::string(info.path.hashPart()));
LambdaSource wrapperSource([&](unsigned char * data, size_t len) -> size_t {
size_t n = source.read(data, len);
@ -1255,7 +1255,7 @@ bool LocalStore::verifyStore(bool checkContents, RepairFlag repair)
if (info->ca == "" || !info->references.count(info->path))
hashSink = std::make_unique<HashSink>(info->narHash.type);
else
hashSink = std::make_unique<HashModuloSink>(info->narHash.type, storePathToHash(printStorePath(info->path)));
hashSink = std::make_unique<HashModuloSink>(info->narHash.type, std::string(info->path.hashPart()));
dumpPath(Store::toRealPath(i), *hashSink);
auto current = hashSink->finish();

2
src/libstore/local.mk
View file

@ -6,7 +6,7 @@ libstore_DIR := $(d)
libstore_SOURCES := $(wildcard $(d)/*.cc $(d)/builtins/*.cc)
libstore_LIBS = libutil libnixrust
libstore_LIBS = libutil
libstore_LDFLAGS = $(SQLITE3_LIBS) -lbz2 $(LIBCURL_LIBS) $(SODIUM_LIBS) -pthread
ifneq ($(OS), FreeBSD)

6
src/libstore/nar-info-disk-cache.cc
View file

@ -189,7 +189,7 @@ public:
return {oInvalid, 0};
auto namePart = queryNAR.getStr(1);
auto narInfo = make_ref<NarInfo>(StorePath::fromBaseName(hashPart + "-" + namePart));
auto narInfo = make_ref<NarInfo>(StorePath(hashPart + "-" + namePart));
narInfo->url = queryNAR.getStr(2);
narInfo->compression = queryNAR.getStr(3);
if (!queryNAR.isNull(4))
@ -198,9 +198,9 @@ public:
narInfo->narHash = Hash(queryNAR.getStr(6));
narInfo->narSize = queryNAR.getInt(7);
for (auto & r : tokenizeString<Strings>(queryNAR.getStr(8), " "))
narInfo->references.insert(StorePath::fromBaseName(r));
narInfo->references.insert(StorePath(r));
if (!queryNAR.isNull(9))
narInfo->deriver = StorePath::fromBaseName(queryNAR.getStr(9));
narInfo->deriver = StorePath(queryNAR.getStr(9));
for (auto & sig : tokenizeString<Strings>(queryNAR.getStr(10), " "))
narInfo->sigs.insert(sig);
narInfo->ca = queryNAR.getStr(11);

4
src/libstore/nar-info.cc
View file

@ -56,11 +56,11 @@ NarInfo::NarInfo(const Store & store, const std::string & s, const std::string &
auto refs = tokenizeString<Strings>(value, " ");
if (!references.empty()) corrupt();
for (auto & r : refs)
references.insert(StorePath::fromBaseName(r));
references.insert(StorePath(r));
}
else if (name == "Deriver") {
if (value != "unknown-deriver")
deriver = StorePath::fromBaseName(value);
deriver = StorePath(value);
}
else if (name == "System")
system = value;

70
src/libstore/path.cc
View file

@ -2,38 +2,38 @@
namespace nix {
extern "C" {
rust::Result<StorePath> ffi_StorePath_new(rust::StringSlice path, rust::StringSlice storeDir);
rust::Result<StorePath> ffi_StorePath_new2(unsigned char hash[20], rust::StringSlice storeDir);
rust::Result<StorePath> ffi_StorePath_fromBaseName(rust::StringSlice baseName);
rust::String ffi_StorePath_to_string(const StorePath & _this);
StorePath ffi_StorePath_clone(const StorePath & _this);
rust::StringSlice ffi_StorePath_name(const StorePath & _this);
MakeError(BadStorePath, Error);
static void checkName(std::string_view path, std::string_view name)
{
if (name.empty())
throw BadStorePath("store path '%s' has an empty name", path);
if (name.size() > 211)
throw BadStorePath("store path '%s' has a name longer than 211 characters", path);
for (auto c : name)
if (!((c >= '0' && c <= '9')
|| (c >= 'a' && c <= 'z')
|| (c >= 'A' && c <= 'Z')
|| c == '+' || c == '-' || c == '.' || c == '_' || c == '?' || c == '='))
throw BadStorePath("store path '%s' contains illegal character '%s'", path, c);
}
StorePath StorePath::make(std::string_view path, std::string_view storeDir)
StorePath::StorePath(std::string_view _baseName)
: baseName(_baseName)
{
return ffi_StorePath_new((rust::StringSlice) path, (rust::StringSlice) storeDir).unwrap();
if (baseName.size() < HashLen + 1)
throw BadStorePath("'%s' is too short to be a valid store path", baseName);
for (auto c : hashPart())
if (c == 'e' || c == 'o' || c == 'u' || c == 't'
|| !((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z')))
throw BadStorePath("store path '%s' contains illegal base-32 character '%s'", baseName, c);
checkName(baseName, name());
}
StorePath StorePath::make(unsigned char hash[20], std::string_view name)
StorePath::StorePath(const Hash & hash, std::string_view _name)
: baseName((hash.to_string(Base32, false) + "-").append(std::string(_name)))
{
return ffi_StorePath_new2(hash, (rust::StringSlice) name).unwrap();
}
StorePath StorePath::fromBaseName(std::string_view baseName)
{
return ffi_StorePath_fromBaseName((rust::StringSlice) baseName).unwrap();
}
rust::String StorePath::to_string() const
{
return ffi_StorePath_to_string(*this);
}
StorePath StorePath::clone() const
{
return ffi_StorePath_clone(*this);
checkName(baseName, name());
}
bool StorePath::isDerivation() const
@ -41,18 +41,14 @@ bool StorePath::isDerivation() const
return hasSuffix(name(), drvExtension);
}
std::string_view StorePath::name() const
{
return ffi_StorePath_name(*this);
}
StorePath StorePath::dummy(
StorePath::make(
(unsigned char *) "xxxxxxxxxxxxxxxxxxxx", "x"));
StorePath StorePath::dummy("ffffffffffffffffffffffffffffffff-x");
StorePath Store::parseStorePath(std::string_view path) const
{
return StorePath::make(path, storeDir);
auto p = canonPath(std::string(path));
if (dirOf(p) != storeDir)
throw BadStorePath("path '%s' is not in the Nix store", p);
return StorePath(baseNameOf(p));
}
std::optional<StorePath> Store::maybeParseStorePath(std::string_view path) const
@ -78,9 +74,7 @@ StorePathSet Store::parseStorePathSet(const PathSet & paths) const
std::string Store::printStorePath(const StorePath & path) const
{
auto s = storeDir + "/";
s += (std::string_view) path.to_string();
return s;
return (storeDir + "/").append(path.to_string());
}
PathSet Store::printStorePathSet(const StorePathSet & paths) const

72
src/libstore/path.hh
View file

@ -1,59 +1,78 @@
#pragma once
#include "rust-ffi.hh"
#include "types.hh"
namespace nix {
/* See path.rs. */
struct StorePath;
class Store;
struct Hash;
extern "C" {
void ffi_StorePath_drop(void *);
bool ffi_StorePath_less_than(const StorePath & a, const StorePath & b);
bool ffi_StorePath_eq(const StorePath & a, const StorePath & b);
unsigned char * ffi_StorePath_hash_data(const StorePath & p);
}
struct StorePath : rust::Value<3 * sizeof(void *) + 24, ffi_StorePath_drop>
class StorePath
{
std::string baseName;
StorePath(const StorePath & path)
: baseName(path.baseName)
{ }
public:
/* Size of the hash part of store paths, in base-32 characters. */
constexpr static size_t HashLen = 32; // i.e. 160 bits
StorePath() = delete;
static StorePath make(std::string_view path, std::string_view storeDir);
StorePath(std::string_view baseName);
static StorePath make(unsigned char hash[20], std::string_view name);
StorePath(const Hash & hash, std::string_view name);
static StorePath fromBaseName(std::string_view baseName);
StorePath(StorePath && path)
: baseName(std::move(path.baseName))
{ }
rust::String to_string() const;
StorePath & operator = (StorePath && path)
{
baseName = std::move(path.baseName);
return *this;
}
std::string_view to_string() const
{
return baseName;
}
bool operator < (const StorePath & other) const
{
return ffi_StorePath_less_than(*this, other);
return baseName < other.baseName;
}
bool operator == (const StorePath & other) const
{
return ffi_StorePath_eq(*this, other);
return baseName == other.baseName;
}
bool operator != (const StorePath & other) const
{
return !(*this == other);
return baseName != other.baseName;
}
StorePath clone() const;
StorePath clone() const
{
return StorePath(*this);
}
/* Check whether a file name ends with the extension for
derivations. */
bool isDerivation() const;
std::string_view name() const;
unsigned char * hashData() const
std::string_view name() const
{
return ffi_StorePath_hash_data(*this);
return std::string_view(baseName).substr(HashLen + 1);
}
std::string_view hashPart() const
{
return std::string_view(baseName).substr(0, HashLen);
}
static StorePath dummy;
@ -67,9 +86,6 @@ StorePathSet storePathsToSet(const StorePaths & paths);
StorePathSet singleton(const StorePath & path);
/* Size of the hash part of store paths, in base-32 characters. */
const size_t storePathHashLen = 32; // i.e. 160 bits
/* Extension of derivations in the Nix store. */
const std::string drvExtension = ".drv";
@ -107,7 +123,7 @@ namespace std {
template<> struct hash<nix::StorePath> {
std::size_t operator()(const nix::StorePath & path) const noexcept
{
return * (std::size_t *) path.hashData();
return * (std::size_t *) path.to_string().data();
}
};

2
src/libstore/remote-fs-accessor.cc
View file

@ -19,7 +19,7 @@ RemoteFSAccessor::RemoteFSAccessor(ref<Store> store, const Path & cacheDir)
Path RemoteFSAccessor::makeCacheFile(const Path & storePath, const std::string & ext)
{
assert(cacheDir != "");
return fmt("%s/%s.%s", cacheDir, storePathToHash(storePath), ext);
return fmt("%s/%s.%s", cacheDir, store->parseStorePath(storePath).hashPart(), ext);
}
void RemoteFSAccessor::addToCache(const Path & storePath, const std::string & nar,

14
src/libstore/store-api.cc
View file

@ -59,14 +59,6 @@ StorePathWithOutputs Store::followLinksToStorePathWithOutputs(std::string_view p
}
string storePathToHash(const Path & path)
{
auto base = baseNameOf(path);
assert(base.size() >= storePathHashLen);
return string(base, 0, storePathHashLen);
}
/* Store paths have the following form:
<store>/<h>-<name>
@ -144,7 +136,7 @@ StorePath Store::makeStorePath(const string & type,
/* e.g., "source:sha256:1abc...:/nix/store:foo.tar.gz" */
string s = type + ":" + hash.to_string(Base16, true) + ":" + storeDir + ":" + std::string(name);
auto h = compressHash(hashString(htSHA256, s), 20);
return StorePath::make(h.hash, name);
return StorePath(h, name);
}
@ -243,7 +235,7 @@ bool Store::PathInfoCacheValue::isKnownNow()
bool Store::isValidPath(const StorePath & storePath)
{
auto hashPart = storePathToHash(printStorePath(storePath));
std::string hashPart(storePath.hashPart());
{
auto state_(state.lock());
@ -311,7 +303,7 @@ void Store::queryPathInfo(const StorePath & storePath,
std::string hashPart;
try {
hashPart = storePathToHash(printStorePath(storePath));
hashPart = storePath.hashPart();
{
auto res = state.lock()->pathInfoCache.get(hashPart);

4
src/libstore/store-api.hh
View file

@ -731,10 +731,6 @@ public:
};
/* Extract the hash part of the given store path. */
string storePathToHash(const Path & path);
/* Copy a path from one store to another. */
void copyStorePath(ref<Store> srcStore, ref<Store> dstStore,
const StorePath & storePath, RepairFlag repair = NoRepair, CheckSigsFlag checkSigs = CheckSigs);

2
src/libutil/local.mk
View file

@ -7,5 +7,3 @@ libutil_DIR := $(d)
libutil_SOURCES := $(wildcard $(d)/*.cc)
libutil_LDFLAGS = $(LIBLZMA_LIBS) -lbz2 -pthread $(OPENSSL_LIBS) $(LIBBROTLI_LIBS) $(LIBARCHIVE_LIBS) $(BOOST_LDFLAGS) -lboost_context
libutil_LIBS = libnixrust

2
src/libutil/rust-ffi.cc
View file

@ -1,3 +1,4 @@
#if 0
#include "logging.hh"
#include "rust-ffi.hh"
@ -20,3 +21,4 @@ std::ostream & operator << (std::ostream & str, const String & s)
}
}
#endif

2
src/libutil/rust-ffi.hh
View file

@ -1,4 +1,5 @@
#pragma once
#if 0
#include "serialise.hh"
@ -185,3 +186,4 @@ struct Result
};
}
#endif

2
src/nix/local.mk
View file

@ -17,7 +17,7 @@ nix_SOURCES := \
nix_CXXFLAGS += -I src/libutil -I src/libstore -I src/libfetchers -I src/libexpr -I src/libmain
nix_LIBS = libexpr libmain libfetchers libstore libutil libnixrust
nix_LIBS = libexpr libmain libfetchers libstore libutil
nix_LDFLAGS = -pthread $(SODIUM_LIBS) $(EDITLINE_LIBS) $(BOOST_LDFLAGS) -lboost_context -lboost_thread -lboost_system

4
src/nix/make-content-addressable.cc
View file

@ -48,7 +48,7 @@ struct CmdMakeContentAddressable : StorePathsCommand, MixJSON
for (auto & path : paths) {
auto pathS = store->printStorePath(path);
auto oldInfo = store->queryPathInfo(path);
auto oldHashPart = storePathToHash(pathS);
std::string oldHashPart(path.hashPart());
StringSink sink;
store->narFromPath(path, sink);
@ -88,7 +88,7 @@ struct CmdMakeContentAddressable : StorePathsCommand, MixJSON
printInfo("rewrote '%s' to '%s'", pathS, store->printStorePath(info.path));
auto source = sinkToSource([&](Sink & nextSink) {
RewritingSink rsink2(oldHashPart, storePathToHash(store->printStorePath(info.path)), nextSink);
RewritingSink rsink2(oldHashPart, std::string(info.path.hashPart()), nextSink);
rsink2((unsigned char *) sink.s->data(), sink.s->size());
rsink2.flush();
});

2
src/nix/verify.cc
View file

@ -90,7 +90,7 @@ struct CmdVerify : StorePathsCommand
if (info->ca == "")
hashSink = std::make_unique<HashSink>(info->narHash.type);
else
hashSink = std::make_unique<HashModuloSink>(info->narHash.type, storePathToHash(store->printStorePath(info->path)));
hashSink = std::make_unique<HashModuloSink>(info->narHash.type, std::string(info->path.hashPart()));
store->narFromPath(info->path, *hashSink);

10
src/nix/why-depends.cc
View file

@ -76,7 +76,7 @@ struct CmdWhyDepends : SourceExprCommand
auto packagePath = toStorePath(store, Build, package);
auto dependency = parseInstallable(*this, store, _dependency, false);
auto dependencyPath = toStorePath(store, NoBuild, dependency);
auto dependencyPathHash = storePathToHash(store->printStorePath(dependencyPath));
auto dependencyPathHash = dependencyPath.hashPart();
StorePathSet closure;
store->computeFSClosure({packagePath}, closure, false, false);
@ -175,7 +175,7 @@ struct CmdWhyDepends : SourceExprCommand
auto & node2 = graph.at(ref);
if (node2.dist == inf) continue;
refs.emplace(node2.dist, &node2);
hashes.insert(storePathToHash(store->printStorePath(node2.path)));
hashes.insert(std::string(node2.path.hashPart()));
}
/* For each reference, find the files and symlinks that
@ -211,7 +211,7 @@ struct CmdWhyDepends : SourceExprCommand
p2,
hilite(filterPrintable(
std::string(contents, pos2, pos - pos2 + hash.size() + margin)),
pos - pos2, storePathHashLen,
pos - pos2, StorePath::HashLen,
getColour(hash))));
}
}
@ -224,7 +224,7 @@ struct CmdWhyDepends : SourceExprCommand
auto pos = target.find(hash);
if (pos != std::string::npos)
hits[hash].emplace_back(fmt("%s -> %s\n", p2,
hilite(target, pos, storePathHashLen, getColour(hash))));
hilite(target, pos, StorePath::HashLen, getColour(hash))));
}
}
};
@ -235,7 +235,7 @@ struct CmdWhyDepends : SourceExprCommand
RunPager pager;
for (auto & ref : refs) {
auto hash = storePathToHash(store->printStorePath(ref.second->path));
std::string hash(ref.second->path.hashPart());
bool last = all ? ref == *refs.rbegin() : true;

2
src/resolve-system-dependencies/local.mk
View file

@ -8,6 +8,6 @@ resolve-system-dependencies_INSTALL_DIR := $(libexecdir)/nix
resolve-system-dependencies_CXXFLAGS += -I src/libutil -I src/libstore -I src/libmain
resolve-system-dependencies_LIBS := libstore libmain libutil libnixrust
resolve-system-dependencies_LIBS := libstore libmain libutil
resolve-system-dependencies_SOURCES := $(d)/resolve-system-dependencies.cc