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Make 'nix copy --to daemon' run in constant memory (daemon side)

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Continuation of 97002b684c. This makes
the daemon use constant memory. For example, it reduces the daemon's
maximum RSS on

  $ nix copy --from ~/my-nix --to daemon /nix/store/1n7x0yv8vq6zi90hfmian84vdhd04bgp-blender-2.79a

from 264 MiB to 7 MiB.

We now use a TunnelSource to prevent the connection from ending up in
an undefined state if an exception is thrown while the NAR is being
sent.

Issue https://github.com/NixOS/nix/issues/1681.
This commit is contained in:
Eelco Dolstra 2018-03-26 23:36:30 +02:00
parent 23d6bb583a
commit 6185d25e52
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GPG key ID: 8170B4726D7198DE
3 changed files with 17 additions and 6 deletions
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2
src/libstore/worker-protocol.hh
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@ -6,7 +6,7 @@ namespace nix {
#define WORKER_MAGIC_1 0x6e697863
#define WORKER_MAGIC_2 0x6478696f
#define PROTOCOL_VERSION 0x114
#define PROTOCOL_VERSION 0x115
#define GET_PROTOCOL_MAJOR(x) ((x) & 0xff00)
#define GET_PROTOCOL_MINOR(x) ((x) & 0x00ff)