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#include "binary-cache-store.hh"
#include "globals.hh"
namespace nix {
class LocalBinaryCacheStore : public BinaryCacheStore
{
private:
Path binaryCacheDir;
public:
LocalBinaryCacheStore(std::shared_ptr<Store> localStore,
const Path & secretKeyFile, const Path & binaryCacheDir);
void init() override;
protected:
bool fileExists(const std::string & path) override;
void upsertFile(const std::string & path, const std::string & data) override;
std::shared_ptr<std::string> getFile(const std::string & path) override;
};
LocalBinaryCacheStore::LocalBinaryCacheStore(std::shared_ptr<Store> localStore,
const Path & secretKeyFile, const Path & binaryCacheDir)
: BinaryCacheStore(localStore, secretKeyFile)
, binaryCacheDir(binaryCacheDir)
{
}
void LocalBinaryCacheStore::init()
{
createDirs(binaryCacheDir + "/nar");
BinaryCacheStore::init();
}
static void atomicWrite(const Path & path, const std::string & s)
{
Path tmp = path + ".tmp." + std::to_string(getpid());
AutoDelete del(tmp, false);
writeFile(tmp, s);
if (rename(tmp.c_str(), path.c_str()))
throw SysError(format("renaming ‘%1%’ to ‘%2%’") % tmp % path);
del.cancel();
}
bool LocalBinaryCacheStore::fileExists(const std::string & path)
{
return pathExists(binaryCacheDir + "/" + path);
}
void LocalBinaryCacheStore::upsertFile(const std::string & path, const std::string & data)
{
atomicWrite(binaryCacheDir + "/" + path, data);
}
std::shared_ptr<std::string> LocalBinaryCacheStore::getFile(const std::string & path)
{
try {
return std::make_shared<std::string>(readFile(binaryCacheDir + "/" + path));
} catch (SysError & e) {
if (e.errNo == ENOENT) return 0;
throw;
}
}
ref<Store> openLocalBinaryCacheStore(std::shared_ptr<Store> localStore,
const Path & secretKeyFile, const Path & binaryCacheDir)
{
auto store = make_ref<LocalBinaryCacheStore>(
localStore, secretKeyFile, binaryCacheDir);
store->init();
return store;
}
static RegisterStoreImplementation regStore([](const std::string & uri) -> std::shared_ptr<Store> {
if (std::string(uri, 0, 7) != "file://") return 0;
return openLocalBinaryCacheStore(std::shared_ptr<Store>(0),
settings.get("binary-cache-secret-key-file", string("")),
std::string(uri, 7));
});
}
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