lix/src/libstore/local-binary-cache-store.cc
Eelco Dolstra 5dafde28db
BinaryCacheStore: Add index-debug-info option
This integrates the functionality of the index-debuginfo program in
nixos-channel-scripts to maintain an index of DWARF debuginfo files in
a format usable by dwarffs. Thus the debug info index is updated by
Hydra rather than by the channel mirroring script.

Example usage:

  $ nix copy --to 'file:///tmp/binary-cache?index-debug-info=true' /nix/store/vr9mhcch3fljzzkjld3kvkggvpq38cva-nix-2.2.2-debug

  $ cat /tmp/binary-cache/debuginfo/036b210b03bad75ab2d8fc80b7a146f98e7f1ecf.debug
  {"archive":"../nar/0313h2kdhk4v73xna9ysiksp2v8xrsk5xsw79mmwr3rg7byb4ka8.nar.xz","member":"lib/debug/.build-id/03/6b210b03bad75ab2d8fc80b7a146f98e7f1ecf.debug"}

Fixes #3083.
2019-09-04 19:28:26 +02:00

106 lines
2.6 KiB
C++

#include "binary-cache-store.hh"
#include "globals.hh"
#include "nar-info-disk-cache.hh"
namespace nix {
class LocalBinaryCacheStore : public BinaryCacheStore
{
private:
Path binaryCacheDir;
public:
LocalBinaryCacheStore(
const Params & params, const Path & binaryCacheDir)
: BinaryCacheStore(params)
, binaryCacheDir(binaryCacheDir)
{
}
void init() override;
std::string getUri() override
{
return "file://" + binaryCacheDir;
}
protected:
bool fileExists(const std::string & path) override;
void upsertFile(const std::string & path,
const std::string & data,
const std::string & mimeType) override;
void getFile(const std::string & path, Sink & sink) override
{
try {
readFile(binaryCacheDir + "/" + path, sink);
} catch (SysError & e) {
if (e.errNo == ENOENT)
throw NoSuchBinaryCacheFile("file '%s' does not exist in binary cache", path);
}
}
PathSet queryAllValidPaths() override
{
PathSet paths;
for (auto & entry : readDirectory(binaryCacheDir)) {
if (entry.name.size() != 40 ||
!hasSuffix(entry.name, ".narinfo"))
continue;
paths.insert(storeDir + "/" + entry.name.substr(0, entry.name.size() - 8));
}
return paths;
}
};
void LocalBinaryCacheStore::init()
{
createDirs(binaryCacheDir + "/nar");
if (writeDebugInfo)
createDirs(binaryCacheDir + "/debuginfo");
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,
const std::string & mimeType)
{
atomicWrite(binaryCacheDir + "/" + path, data);
}
static RegisterStoreImplementation regStore([](
const std::string & uri, const Store::Params & params)
-> std::shared_ptr<Store>
{
if (getEnv("_NIX_FORCE_HTTP_BINARY_CACHE_STORE") == "1" ||
std::string(uri, 0, 7) != "file://")
return 0;
auto store = std::make_shared<LocalBinaryCacheStore>(params, std::string(uri, 7));
store->init();
return store;
});
}