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base repository: NixOS/nix
base: 11ba4302e366
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head repository: NixOS/nix
compare: b24b8ef77c63
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  • 2 commits
  • 4 files changed
  • 1 contributor

Commits on Oct 17, 2017

  1. BinaryCacheStore: Support local caching of NARs 

    This speeds up commands like "nix cat-store". For example:

  $ time nix cat-store --store https://cache.nixos.org?local-nar-cache=/tmp/nar-cache /nix/store/i60yncmq6w9dyv37zd2k454g0fkl3arl-systemd-234/etc/udev/udev.conf
  real    0m4.336s

  $ time nix cat-store --store https://cache.nixos.org?local-nar-cache=/tmp/nar-cache /nix/store/i60yncmq6w9dyv37zd2k454g0fkl3arl-systemd-234/etc/udev/udev.conf
  real    0m0.045s

The primary motivation is to allow hydra-server to serve files from S3
binary caches. Previously Hydra had a hack to do "nix-store -r
<path>", but that fetches the entire closure so is prohibitively
expensive.

There is no garbage collection of the NAR cache yet. Also, the entire
NAR is read when accessing a single member file. We could generate the
NAR listing to provide random access.

Note: the NAR cache is indexed by the store path hash, not the content
hash, so NAR caches should not be shared between binary caches, unless
you're sure that all your builds are binary-reproducible.
    @edolstra
    edolstra committed Oct 17, 2017
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  2. BinaryCacheStore::addToStore(): Add NARs to the local cache

    @edolstra
    edolstra committed Oct 17, 2017
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    b24b8ef View commit details
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