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authorEelco Dolstra <edolstra@gmail.com>2016-10-21T14·50+0200
committerEelco Dolstra <edolstra@gmail.com>2016-10-21T14·50+0200
commit542ae5c8f804b704101f9d27bd8b2aa62ded899c (patch)
treef80ffbbfcdc2e25dbbc660e103144fa61958b235 /maintainers
parent307cc8c33d1dc4abaaf15d8f4ec64c02d5bb81aa (diff)
BinaryCacheStore: Optionally write a NAR listing
The store parameter "write-nar-listing=1" will cause BinaryCacheStore
to write a file ‘<store-hash>.ls.xz’ for each ‘<store-hash>.narinfo’
added to the binary cache. This file contains an XZ-compressed JSON
file describing the contents of the NAR, excluding the contents of
regular files.

E.g.

  {
    "version": 1,
    "root": {
      "type": "directory",
      "entries": {
        "lib": {
          "type": "directory",
          "entries": {
            "Mcrt1.o": {
              "type": "regular",
              "size": 1288
            },
            "Scrt1.o": {
              "type": "regular",
              "size": 3920
            },
          }
        }
      }
      ...
    }
  }

(The actual file has no indentation.)

This is intended to speed up the NixOS channels programs index
generator [1], since fetching gazillions of large NARs from
cache.nixos.org is currently a bottleneck for updating the regular
(non-small) channel.

[1] https://github.com/NixOS/nixos-channel-scripts/blob/master/generate-programs-index.cc
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