Nix Registry Add Command

src/nix/registry-add.md

443453178c9ac30780cb00e5b148b2a2943954b3bf5f6f6100000003000003b6

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# Examples

* Set the `nixpkgs` flake identifier to a specific branch of Nixpkgs:

  ```console
  # nix registry add nixpkgs github:NixOS/nixpkgs/nixos-20.03
  ```

* Pin `nixpkgs` to a specific revision:

  ```console
  # nix registry add nixpkgs github:NixOS/nixpkgs/925b70cd964ceaedee26fde9b19cc4c4f081196a
  ```

* Add an entry that redirects a specific branch of `nixpkgs` to
  another fork:

  ```console
  # nix registry add nixpkgs/nixos-20.03 ~/Dev/nixpkgs
  ```

* Add `nixpkgs` pointing to `github:nixos/nixpkgs` to your custom flake
  registry:

  ```console
  nix registry add --registry ./custom-flake-registry.json nixpkgs github:nixos/nixpkgs
  ```

# Description

This command adds an entry to the user registry that maps flake
reference *from-url* to flake reference *to-url*. If an entry for
*from-url* already exists, it is overwritten.

Entries can be removed using [`nix registry
remove`](./nix3-registry-remove.md).

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Chunks

936f40ba (1st chunk of `src/nix/registry-add.md`)

Title: Nix Registry Add Command

Summary

This chunk provides examples and a description of the `nix registry add` command. The examples demonstrate how to set `nixpkgs` to a specific branch or revision, redirect a `nixpkgs` branch to a local fork, and add entries to a custom flake registry. The description explains that the command adds or overwrites an entry in the user registry, mapping a flake reference 'from-url' to a 'to-url'. It also notes that entries can be removed using `nix registry remove`.