nix upgrade-nix - Lix Reference Manual

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

# Name

`nix upgrade-nix` - upgrade Nix to the stable version declared in Nixpkgs

# Synopsis

`nix upgrade-nix` [option...]

# Examples

- Upgrade Nix to the stable version declared in Nixpkgs:

      # nix upgrade-nix

- Upgrade Nix in a specific profile:

      # nix upgrade-nix --profile ~alice/.local/state/nix/profiles/profile

# Description

This command upgrades Lix to the latest stable version. This stable version is defined in the Lix manifest and updated manually. It may not always be the latest tagged release.

By default, it locates the directory containing the `nix` binary in the `$PATH` environment variable. If that directory is a Nix profile, it will upgrade the `nix` package in that profile to the latest stable binary release.

You cannot use this command to upgrade Nix in the system profile of a NixOS system (that is, if `nix` is found in `/run/current-system`).

# Options

- `--dry-run` Show what this command would do without doing it.

- `--nix-store-paths-url` url The URL of the file that contains the store paths of the latest Nix release.

- `--profile` / `-p` profile-dir The path to the Nix profile to upgrade.

- `--store-path` store-path A specific store path to upgrade Nix to

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.

- `--debugger` Start an interactive environment if evaluation fails.

- `--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 Lix 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 Lix 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 Lix 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`, `bar-with-logs`, `multiline` or `multiline-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 Lix 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.