mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-09-21 08:58:04 +03:00
d1b0909894
This allows readFile() to indicate that a file doesn't exist, and might eliminate some large string copying.
89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
#include "binary-cache-store.hh"
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#include "globals.hh"
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namespace nix {
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class LocalBinaryCacheStore : public BinaryCacheStore
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{
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private:
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Path binaryCacheDir;
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public:
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LocalBinaryCacheStore(std::shared_ptr<Store> localStore,
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const Path & secretKeyFile, const Path & binaryCacheDir);
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void init() override;
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protected:
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bool fileExists(const std::string & path) override;
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void upsertFile(const std::string & path, const std::string & data) override;
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std::shared_ptr<std::string> getFile(const std::string & path) override;
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};
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LocalBinaryCacheStore::LocalBinaryCacheStore(std::shared_ptr<Store> localStore,
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const Path & secretKeyFile, const Path & binaryCacheDir)
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: BinaryCacheStore(localStore, secretKeyFile)
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, binaryCacheDir(binaryCacheDir)
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{
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}
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void LocalBinaryCacheStore::init()
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{
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createDirs(binaryCacheDir + "/nar");
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BinaryCacheStore::init();
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}
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static void atomicWrite(const Path & path, const std::string & s)
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{
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Path tmp = path + ".tmp." + std::to_string(getpid());
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AutoDelete del(tmp, false);
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writeFile(tmp, s);
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if (rename(tmp.c_str(), path.c_str()))
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throw SysError(format("renaming ‘%1%’ to ‘%2%’") % tmp % path);
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del.cancel();
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}
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bool LocalBinaryCacheStore::fileExists(const std::string & path)
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{
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return pathExists(binaryCacheDir + "/" + path);
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}
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void LocalBinaryCacheStore::upsertFile(const std::string & path, const std::string & data)
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{
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atomicWrite(binaryCacheDir + "/" + path, data);
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}
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std::shared_ptr<std::string> LocalBinaryCacheStore::getFile(const std::string & path)
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{
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try {
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return std::make_shared<std::string>(readFile(binaryCacheDir + "/" + path));
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} catch (SysError & e) {
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if (e.errNo == ENOENT) return 0;
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throw;
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}
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}
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ref<Store> openLocalBinaryCacheStore(std::shared_ptr<Store> localStore,
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const Path & secretKeyFile, const Path & binaryCacheDir)
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{
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auto store = make_ref<LocalBinaryCacheStore>(
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localStore, secretKeyFile, binaryCacheDir);
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store->init();
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return store;
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}
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static RegisterStoreImplementation regStore([](const std::string & uri) -> std::shared_ptr<Store> {
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if (std::string(uri, 0, 7) != "file://") return 0;
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return openLocalBinaryCacheStore(std::shared_ptr<Store>(0),
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settings.get("binary-cache-secret-key-file", string("")),
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std::string(uri, 7));
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});
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}
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