Warning
This program is experimental and its interface is subject to change.

Name

nix registry add - add/replace flake in user flake registry

Synopsis

nix registry add [option...] from-url to-url

Examples

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

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

• Pin nixpkgs to a specific revision:

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

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

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

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

  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.

Options

• --registry registry

  The registry to operate on.

Common evaluation options

• --arg name expr

  Pass the value expr as the argument name to Nix functions.

• --argstr name string

  Pass the string string as the argument name to Nix functions.

• --eval-store store-url

  The URL of the Nix store to use for evaluation, i.e. to store derivations (.drv files) and inputs referenced by them.

• --impure

  Allow access to mutable paths and repositories.

• --include / -I path

  Add path to the Nix search path. The Nix search path is initialized from the colon-separated NIX_PATH environment variable, and is used to look up the location of Nix expressions using paths enclosed in angle brackets (i.e., <nixpkgs>).

  For instance, passing

  -I /home/eelco/Dev
  -I /etc/nixos
  

  will cause Nix to look for paths relative to /home/eelco/Dev and /etc/nixos, in that order. This is equivalent to setting the NIX_PATH environment variable to

  /home/eelco/Dev:/etc/nixos
  

  It is also possible to match paths against a prefix. For example, passing

  -I nixpkgs=/home/eelco/Dev/nixpkgs-branch
  -I /etc/nixos
  

  will cause Nix to search for <nixpkgs/path> in /home/eelco/Dev/nixpkgs-branch/path and /etc/nixos/nixpkgs/path.

  If a path in the Nix search path starts with http:// or https://, it is interpreted as the URL of a tarball that will be downloaded and unpacked to a temporary location. The tarball must consist of a single top-level directory. For example, passing

  -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/master.tar.gz
  

  tells Nix to download and use the current contents of the master branch in the nixpkgs repository.

  The URLs of the tarballs from the official nixos.org channels (see the manual page for nix-channel) can be abbreviated as channel:<channel-name>. For instance, the following two flags are equivalent:

  -I nixpkgs=channel:nixos-21.05
  -I nixpkgs=https://nixos.org/channels/nixos-21.05/nixexprs.tar.xz
  

  You can also fetch source trees using flake URLs and add them to the search path. For instance,

  -I nixpkgs=flake:nixpkgs
  

  specifies that the prefix nixpkgs shall refer to the source tree downloaded from the nixpkgs entry in the flake registry. Similarly,

  -I nixpkgs=flake:github:NixOS/nixpkgs/nixos-22.05
  

  makes <nixpkgs> refer to a particular branch of the NixOS/nixpkgs repository on GitHub.

• --override-flake original-ref resolved-ref

  Override the flake registries, redirecting original-ref to resolved-ref.

Logging-related options

• --debug

  Set the logging verbosity level to 'debug'.

• --log-format format

  Set the format of log output; one of raw, internal-json, bar or bar-with-logs.

• --print-build-logs / -L

  Print full build logs on standard error.

• --quiet

  Decrease the logging verbosity level.

• --verbose / -v

  Increase the logging verbosity level.

Miscellaneous global options

• --help

  Show usage information.

• --offline

  Disable substituters and consider all previously downloaded files up-to-date.

• --option name value

  Set the Nix configuration setting name to value (overriding nix.conf).

• --refresh

  Consider all previously downloaded files out-of-date.

• --repair

  During evaluation, rewrite missing or corrupted files in the Nix store. During building, rebuild missing or corrupted store paths.

• --version

  Show version information.

Note

See man nix.conf for overriding configuration settings with command line flags.