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lix/src/nix/registry-pin.md
Eelco Dolstra e90e745232
Add 'nix registry' manpages 
This also documents the registry format and matching/unification
semantics (though not quite correctly).
2020-12-21 13:32:27 +01:00

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R""(

Examples

  • Pin nixpkgs to its most recent Git revision:

    # nix registry pin nixpkgs

    Afterwards the user registry will have an entry like this:

    nix registry list | grep '^user '
user   flake:nixpkgs github:NixOS/nixpkgs/925b70cd964ceaedee26fde9b19cc4c4f081196a

    and nix flake info will say:

    # nix flake info nixpkgs
Resolved URL:  github:NixOS/nixpkgs/925b70cd964ceaedee26fde9b19cc4c4f081196a
Locked URL:    github:NixOS/nixpkgs/925b70cd964ceaedee26fde9b19cc4c4f081196a
…

Description

This command adds an entry to the user registry that maps flake reference url to the corresponding locked flake reference, that is, a flake reference that specifies an exact revision or content hash. This ensures that until this registry entry is removed, all uses of url will resolve to exactly the same flake.

Entries can be removed using nix registry remove.

)""