85 lines
2 KiB
C++
85 lines
2 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 StoreParams & params, const Path & binaryCacheDir)
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: BinaryCacheStore(localStore, params)
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, binaryCacheDir(binaryCacheDir)
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{
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}
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void init() override;
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std::string getUri() override
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{
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return "file://" + binaryCacheDir;
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}
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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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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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static RegisterStoreImplementation regStore([](
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const std::string & uri, const StoreParams & params)
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-> std::shared_ptr<Store>
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{
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if (std::string(uri, 0, 7) != "file://") return 0;
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auto store = std::make_shared<LocalBinaryCacheStore>(
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std::shared_ptr<Store>(0), params, std::string(uri, 7));
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store->init();
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return store;
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});
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}
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