nix3-flake-update(1)

    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…] inputs…

Examples

•   Update all inputs (i.e. recreate the lock file from scratch):

    # nix flake update
    warning: updating lock file '/home/myself/repos/testflake/flake.lock':
    • Updated input 'nix':
      'github:NixOS/nix/9fab14adbc3810d5cc1f88672fde1eee4358405c' (2023-06-28)
    → 'github:NixOS/nix/8927cba62f5afb33b01016d5c4f7f8b7d0adde3c' (2023-07-11)
    • Updated input 'nixpkgs':
      'github:NixOS/nixpkgs/3d2d8f281a27d466fa54b469b5993f7dde198375' (2023-06-30)
    → 'github:NixOS/nixpkgs/a3a3dda3bacf61e8a39258a0ed9c924eeca8e293' (2023-07-05)

•   Update only a single input:

    # nix flake update nixpkgs
    warning: updating lock file '/home/myself/repos/testflake/flake.lock':
    • Updated input 'nixpkgs':
      'github:NixOS/nixpkgs/3d2d8f281a27d466fa54b469b5993f7dde198375' (2023-06-30)
    → 'github:NixOS/nixpkgs/a3a3dda3bacf61e8a39258a0ed9c924eeca8e293' (2023-07-05)

•   Update multiple inputs:

    # nix flake update nixpkgs nixpkgs-unstable
    warning: updating lock file '/home/myself/repos/testflake/flake.lock':
    • Updated input 'nixpkgs':
      'github:nixos/nixpkgs/8f7492cce28977fbf8bd12c72af08b1f6c7c3e49' (2024-09-14)
    → 'github:nixos/nixpkgs/086b448a5d54fd117f4dc2dee55c9f0ff461bdc1' (2024-09-16)
    • Updated input 'nixpkgs-unstable':
      'github:nixos/nixpkgs/345c263f2f53a3710abe117f28a5cb86d0ba4059' (2024-09-13)
    → 'github:nixos/nixpkgs/99dc8785f6a0adac95f5e2ab05cc2e1bf666d172' (2024-09-16)

•   Update only a single input of a flake in a different directory:

    # nix flake update nixpkgs --flake ~/repos/another
    warning: updating lock file '/home/myself/repos/another/flake.lock':
    • Updated input 'nixpkgs':
      'github:NixOS/nixpkgs/3d2d8f281a27d466fa54b469b5993f7dde198375' (2023-06-30)
    → 'github:NixOS/nixpkgs/a3a3dda3bacf61e8a39258a0ed9c924eeca8e293' (2023-07-05)

        Note

        When trying to refer to a flake in a subdirectory, write ./another instead of another. Otherwise Nix will try to look up the flake in the registry.

Description

This command updates the inputs in a lock file (flake.lock). By default, all inputs are updated. If the lock file doesn’t exist yet, it will be created. If inputs are not in the lock file yet, they will be added.

Unlike other nix flake commands, nix flake update takes a list of names of inputs to update as its positional arguments and operates on the flake in the current directory. You can pass a different flake-url with --flake to override that default.

The related command nix flake lock also creates lock files and adds missing inputs, but is safer as it will never update inputs already in the lock file.

Options

•   --flake flake-url

    The flake to operate on. Default is the current directory.

  Common evaluation options

•   --arg name expr

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

•   --arg-from-file name path

    Pass the contents of file path as the argument name to Nix functions.

•   --arg-from-stdin name

    Pass the contents of stdin 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 search path entries used to resolve lookup paths

    This option may be given multiple times.

    Paths added through -I take precedence over the nix-path configuration setting and the NIX_PATH environment variable.

•   --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.

        DEPRECATED

        Use --no-use-registries instead.

•   --output-lock-file flake-lock-path

    Write the given lock file instead of flake.lock within the top-level flake.

•   --override-input input-path flake-url

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

•   --recreate-lock-file

    Recreate the flake’s lock file from scratch.

        DEPRECATED

        Use nix flake update instead.

•   --reference-lock-file flake-lock-path

    Read the given lock file instead of flake.lock within the top-level flake.

•   --update-input input-path

    Update a specific flake input (ignoring its previous entry in the lock file).

        DEPRECATED

        Use nix flake update instead.

  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.