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Low-latency closure copy

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This adds a new store operation 'addMultipleToStore' that reads a
number of NARs and ValidPathInfos from a Source, allowing any number
of store paths to be copied in a single call. This is much faster on
high-latency links when copying a lot of small files, like .drv
closures.

For example, on a connection with an 50 ms delay:

Before:

  $ nix copy --to 'unix:///tmp/proxy-socket?root=/tmp/dest-chroot' \
    /nix/store/90jjw94xiyg5drj70whm9yll6xjj0ca9-hello-2.10.drv \
    --derivation --no-check-sigs
  real    0m57.868s
  user    0m0.103s
  sys     0m0.056s

After:

  real    0m0.690s
  user    0m0.017s
  sys     0m0.011s
This commit is contained in:
Eelco Dolstra 2021-07-26 13:31:09 +02:00
parent 9957315ce0
commit fe1f34fa60
8 changed files with 162 additions and 90 deletions
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5
src/libstore/path-info.hh
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@ -105,6 +105,11 @@ struct ValidPathInfo
ValidPathInfo(const StorePath & path, Hash narHash) : path(path), narHash(narHash) { };
virtual ~ValidPathInfo() { }
static ValidPathInfo read(Source & source, const Store & store, unsigned int format);
static ValidPathInfo read(Source & source, const Store & store, unsigned int format, StorePath && path);
void write(Sink & sink, const Store & store, unsigned int format, bool includePath = true) const;
};
typedef std::map<StorePath, ValidPathInfo> ValidPathInfos;