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Make 'nix copy --from ssh://...' run in constant memory

Browse source 
For instance, this reduced the memory consumption of

  $ nix copy --from ssh://localhost --to ~/my-nix /nix/store/1n7x0yv8vq6zi90hfmian84vdhd04bgp-blender-2.79a

from 632 MiB to 16 MiB.
This commit is contained in:
Eelco Dolstra 2018-03-21 22:56:02 +01:00
parent 92dfc22327
commit 47f7e5585b
4 changed files with 22 additions and 24 deletions
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19
src/libstore/ssh-store.cc
View file

@ -63,29 +63,12 @@ private:
};
};
class ForwardSource : public Source
{
Source & readSource;
Sink & writeSink;
public:
ForwardSource(Source & readSource, Sink & writeSink) : readSource(readSource), writeSink(writeSink) {}
size_t read(unsigned char * data, size_t len) override
{
auto n = readSource.read(data, len);
writeSink(data, n);
return n;
}
};
void SSHStore::narFromPath(const Path & path, Sink & sink)
{
auto conn(connections->get());
conn->to << wopNarFromPath << path;
conn->processStderr();
ParseSink ps;
auto fwd = ForwardSource(conn->from, sink);
parseDump(ps, fwd);
copyNAR(conn->from, sink);
}
ref<FSAccessor> SSHStore::getFSAccessor()