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

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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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7
src/libstore/legacy-ssh-store.cc
View file

@ -151,12 +151,7 @@ struct LegacySSHStore : public Store
conn->to << cmdDumpStorePath << path;
conn->to.flush();
/* FIXME: inefficient. */
ParseSink parseSink; /* null sink; just parse the NAR */
TeeSource savedNAR(conn->from);
parseDump(parseSink, savedNAR);
sink(*savedNAR.data);
copyNAR(conn->from, sink);
}
PathSet queryAllValidPaths() override { unsupported(); }