nix flake update

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

# Name

`nix flake update` - update flake lock file

# Synopsis

`nix flake update` [option...] flake-url

# Examples

- Recreate the lock file (i.e. update all inputs) and commit the new lock file:

      # nix flake update
      * Updated 'nix': 'github:NixOS/nix/9fab14adbc3810d5cc1f88672fde1eee4358405c' -> 'github:NixOS/nix/8927cba62f5afb33b01016d5c4f7f8b7d0adde3c'
      * Updated 'nixpkgs': 'github:NixOS/nixpkgs/3d2d8f281a27d466fa54b469b5993f7dde198375' -> 'github:NixOS/nixpkgs/a3a3dda3bacf61e8a39258a0ed9c924eeca8e293'
      …
      warning: committed new revision '158bcbd9d6cc08ab859c0810186c1beebc982aad'

# Description

This command recreates the lock file of a flake (`flake.lock`), thus updating the lock for every mutable input (like `nixpkgs`) to its current version. This is equivalent to passing `--recreate-lock-file` to any command that operates on a flake. That is,

    # nix flake update
    # nix build

is equivalent to:

    # nix build --recreate-lock-file

# Options

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 Nix store to use for evaluations.

- `--impure`
  Allow access to mutable paths and repositories.

- `--include` / `-I` path
  Add path to the list of locations used to look up `<...>` file names.

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

Common flake-related options:

- `--commit-lock-file`
  Commit changes to the flake's lock file.

- `--inputs-from` flake-url
  Use the inputs of the specified flake as registry entries.

- `--no-registries`
  Don't allow lookups in the flake registries. This option is deprecated; use `--no-use-registries`.

- `--override-input` input-path flake-url
  Override a specific flake input (e.g. `dwarffs/nixpkgs`). This implies `--no-write-lock-file`.