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Make 'nix copy' to file:// binary caches run in constant memory

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This commit is contained in:
Eelco Dolstra 2020-07-10 20:58:02 +02:00
parent 400f1a9b59
commit fc84c358d9
9 changed files with 120 additions and 87 deletions
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30
src/libstore/local-binary-cache-store.cc
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@ -31,8 +31,17 @@ protected:
bool fileExists(const std::string & path) override;
void upsertFile(const std::string & path,
const std::string & data,
const std::string & mimeType) override;
Source & source,
const std::string & mimeType)
{
auto path2 = binaryCacheDir + "/" + path;
Path tmp = path2 + ".tmp." + std::to_string(getpid());
AutoDelete del(tmp, false);
writeFile(tmp, source);
if (rename(tmp.c_str(), path2.c_str()))
throw SysError("renaming '%1%' to '%2%'", tmp, path2);
del.cancel();
}
void getFile(const std::string & path, Sink & sink) override
{
@ -70,28 +79,11 @@ void LocalBinaryCacheStore::init()
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("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,
const std::string & mimeType)
{
atomicWrite(binaryCacheDir + "/" + path, data);
}
static RegisterStoreImplementation regStore([](
const std::string & uri, const Store::Params & params)
-> std::shared_ptr<Store>