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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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33
src/libstore/export-import.cc
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@ -7,24 +7,6 @@
namespace nix {
struct HashAndWriteSink : Sink
{
Sink & writeSink;
HashSink hashSink;
HashAndWriteSink(Sink & writeSink) : writeSink(writeSink), hashSink(htSHA256)
{
}
virtual void operator () (const unsigned char * data, size_t len)
{
writeSink(data, len);
hashSink(data, len);
}
Hash currentHash()
{
return hashSink.currentHash().first;
}
};
void Store::exportPaths(const StorePathSet & paths, Sink & sink)
{
auto sorted = topoSortPaths(paths);
@ -47,23 +29,24 @@ void Store::exportPath(const StorePath & path, Sink & sink)
{
auto info = queryPathInfo(path);
HashAndWriteSink hashAndWriteSink(sink);
HashSink hashSink(htSHA256);
TeeSink teeSink(sink, hashSink);
narFromPath(path, hashAndWriteSink);
narFromPath(path, teeSink);
/* Refuse to export paths that have changed. This prevents
filesystem corruption from spreading to other machines.
Don't complain if the stored hash is zero (unknown). */
Hash hash = hashAndWriteSink.currentHash();
Hash hash = hashSink.currentHash().first;
if (hash != info->narHash && info->narHash != Hash(*info->narHash.type))
throw Error("hash of path '%s' has changed from '%s' to '%s'!",
printStorePath(path), info->narHash.to_string(Base32, true), hash.to_string(Base32, true));
hashAndWriteSink
teeSink
<< exportMagic
<< printStorePath(path);
writeStorePaths(*this, hashAndWriteSink, info->references);
hashAndWriteSink
writeStorePaths(*this, teeSink, info->references);
teeSink
<< (info->deriver ? printStorePath(*info->deriver) : "")
<< 0;
}
@ -77,7 +60,7 @@ StorePaths Store::importPaths(Source & source, std::shared_ptr<FSAccessor> acces
if (n != 1) throw Error("input doesn't look like something created by 'nix-store --export'");
/* Extract the NAR from the source. */
TeeSink tee(source);
TeeParseSink tee(source);
parseDump(tee, tee.source);
uint32_t magic = readInt(source);