Local Binary Cache Store

Store URL format: file://path

This store allows reading and writing a binary cache stored in path in the local filesystem. If path does not exist, it will be created.

For example, the following builds or downloads nixpkgs#hello into the local store and then copies it to the binary cache in /tmp/binary-cache:

# nix copy --to file:///tmp/binary-cache nixpkgs#hello

Settings

• compression

  NAR compression method (xz, bzip2, gzip, zstd, or none).

  Default: xz

• compression-level

  The preset level to be used when compressing NARs. The meaning and accepted values depend on the compression method selected. -1 specifies that the default compression level should be used.

  Default: -1

• index-debug-info

  Whether to index DWARF debug info files by build ID. This allows dwarffs to fetch debug info on demand

  Default: false

• local-nar-cache

  Path to a local cache of NARs fetched from this binary cache, used by commands such as nix store cat.

  Default: empty

• parallel-compression

  Enable multi-threaded compression of NARs. This is currently only available for xz and zstd.

  Default: false

• path-info-cache-size

  Size of the in-memory store path metadata cache.

  Default: 65536

• priority

  Priority of this store when used as a substituter. A lower value means a higher priority.

  Default: 0

• secret-key

  Path to the secret key used to sign the binary cache.

  Default: empty

• store

  Logical location of the Nix store, usually /nix/store. Note that you can only copy store paths between stores if they have the same store setting.

  Default: /nix/store

• system-features

  Optional system features available on the system this store uses to build derivations.

  Example: "kvm"

  Default: machine-specific

• trusted

  Whether paths from this store can be used as substitutes even if they are not signed by a key listed in the trusted-public-keys setting.

  Default: false

• want-mass-query

  Whether this store can be queried efficiently for path validity when used as a substituter.

  Default: false

• write-nar-listing

  Whether to write a JSON file that lists the files in each NAR.

  Default: false