lix/src/nix/registry-add.md

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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
```
2021-06-30 19:13:32 +00:00
* 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).
)""