diff --git a/README.md b/README.md index 48cb1685c..a953c0f71 100644 --- a/README.md +++ b/README.md @@ -9,11 +9,11 @@ appear with Nix. To find out more about the tool, usage and installation instructions, please read the manual, which is available on the Nix website at -. +. ## Contributing -Take a look at the [Hacking Section](http://nixos.org/nix/manual/#chap-hacking) +Take a look at the [Hacking Section](https://nixos.org/nix/manual/#chap-hacking) of the manual. It helps you to get started with building Nix from source. ## License @@ -21,4 +21,4 @@ of the manual. It helps you to get started with building Nix from source. Nix is released under the LGPL v2.1 This product includes software developed by the OpenSSL Project for -use in the [OpenSSL Toolkit](http://www.OpenSSL.org/). +use in the [OpenSSL Toolkit](https://www.OpenSSL.org/). diff --git a/scripts/install-nix-from-closure.sh b/scripts/install-nix-from-closure.sh index 3fea7e056..e00708f6c 100644 --- a/scripts/install-nix-from-closure.sh +++ b/scripts/install-nix-from-closure.sh @@ -87,7 +87,7 @@ if ! [ -e $dest ]; then fi if ! [ -w $dest ]; then - echo "$0: directory $dest exists, but is not writable by you. This could indicate that another user has already performed a single-user installation of Nix on this system. If you wish to enable multi-user support see http://nixos.org/nix/manual/#ssec-multi-user. If you wish to continue with a single-user install for $USER please run 'chown -R $USER $dest' as root." >&2 + echo "$0: directory $dest exists, but is not writable by you. This could indicate that another user has already performed a single-user installation of Nix on this system. If you wish to enable multi-user support see https://nixos.org/nix/manual/#ssec-multi-user. If you wish to continue with a single-user install for $USER please run 'chown -R $USER $dest' as root." >&2 exit 1 fi diff --git a/src/libstore/binary-cache-store.cc b/src/libstore/binary-cache-store.cc index 717faec92..3a2d84861 100644 --- a/src/libstore/binary-cache-store.cc +++ b/src/libstore/binary-cache-store.cc @@ -106,7 +106,7 @@ void BinaryCacheStore::writeNarInfo(ref narInfo) { auto state_(state.lock()); - state_->pathInfoCache.upsert(hashPart, std::shared_ptr(narInfo)); + state_->pathInfoCache.upsert(hashPart, PathInfoCacheValue { .value = std::shared_ptr(narInfo) }); } if (diskCache) diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc index e59624cd3..c5929a41c 100644 --- a/src/libstore/local-store.cc +++ b/src/libstore/local-store.cc @@ -622,7 +622,8 @@ uint64_t LocalStore::addValidPath(State & state, { auto state_(Store::state.lock()); - state_->pathInfoCache.upsert(storePathToHash(printStorePath(info.path)), std::make_shared(info)); + state_->pathInfoCache.upsert(storePathToHash(printStorePath(info.path)), + PathInfoCacheValue{ .value = std::make_shared(info) }); } return id; diff --git a/src/libstore/store-api.cc b/src/libstore/store-api.cc index 75fa5d1e6..b043feb0a 100644 --- a/src/libstore/store-api.cc +++ b/src/libstore/store-api.cc @@ -226,6 +226,14 @@ std::string Store::getUri() return ""; } +bool Store::PathInfoCacheValue::isKnownNow() +{ + std::chrono::duration ttl = didExist() + ? std::chrono::seconds(settings.ttlPositiveNarInfoCache) + : std::chrono::seconds(settings.ttlNegativeNarInfoCache); + + return std::chrono::steady_clock::now() < time_point + ttl; +} bool Store::isValidPath(const StorePath & storePath) { @@ -234,9 +242,9 @@ bool Store::isValidPath(const StorePath & storePath) { auto state_(state.lock()); auto res = state_->pathInfoCache.get(hashPart); - if (res) { + if (res && res->isKnownNow()) { stats.narInfoReadAverted++; - return *res != 0; + return res->didExist(); } } @@ -246,7 +254,7 @@ bool Store::isValidPath(const StorePath & storePath) stats.narInfoReadAverted++; auto state_(state.lock()); state_->pathInfoCache.upsert(hashPart, - res.first == NarInfoDiskCache::oInvalid ? 0 : res.second); + res.first == NarInfoDiskCache::oInvalid ? PathInfoCacheValue{} : PathInfoCacheValue { .value = res.second }); return res.first == NarInfoDiskCache::oValid; } } @@ -301,11 +309,11 @@ void Store::queryPathInfo(const StorePath & storePath, { auto res = state.lock()->pathInfoCache.get(hashPart); - if (res) { + if (res && res->isKnownNow()) { stats.narInfoReadAverted++; - if (!*res) + if (!res->didExist()) throw InvalidPath("path '%s' is not valid", printStorePath(storePath)); - return callback(ref(*res)); + return callback(ref(res->value)); } } @@ -316,7 +324,7 @@ void Store::queryPathInfo(const StorePath & storePath, { auto state_(state.lock()); state_->pathInfoCache.upsert(hashPart, - res.first == NarInfoDiskCache::oInvalid ? 0 : res.second); + res.first == NarInfoDiskCache::oInvalid ? PathInfoCacheValue{} : PathInfoCacheValue{ .value = res.second }); if (res.first == NarInfoDiskCache::oInvalid || res.second->path != storePath) throw InvalidPath("path '%s' is not valid", printStorePath(storePath)); @@ -340,7 +348,7 @@ void Store::queryPathInfo(const StorePath & storePath, { auto state_(state.lock()); - state_->pathInfoCache.upsert(hashPart, info); + state_->pathInfoCache.upsert(hashPart, PathInfoCacheValue { .value = info }); } if (!info || info->path != parseStorePath(storePath)) { diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh index a000757fb..e0484de13 100644 --- a/src/libstore/store-api.hh +++ b/src/libstore/store-api.hh @@ -16,6 +16,7 @@ #include #include #include +#include namespace nix { @@ -261,10 +262,28 @@ public: protected: + struct PathInfoCacheValue { + + // Time of cache entry creation or update + std::chrono::time_point time_point = std::chrono::steady_clock::now(); + + // Null if missing + std::shared_ptr value; + + // Whether the value is valid as a cache entry. The path may not exist. + bool isKnownNow(); + + // Past tense, because a path can only be assumed to exists when + // isKnownNow() && didExist() + inline bool didExist() { + return value != nullptr; + } + }; + struct State { // FIXME: fix key - LRUCache> pathInfoCache; + LRUCache pathInfoCache; }; Sync state;