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nix3-flake-init(1) General Commands Manual nix3-flake-init(1)

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

Name

nix flake init - create a flake in the current directory from a template

Synopsis

nix flake init [option…]

Examples

•
Create a flake using the default template:

# nix flake init
•
List available templates:

# nix flake show templates
•
Create a flake from a specific template:

# nix flake init -t templates#simpleContainer

Description

This command creates a flake in the current directory by copying the files of a template. It will not overwrite existing files. The default template is templates#templates.default, but this can be overridden using -t.

Template definitions

A flake can declare templates through its templates output attribute. A template has the following attributes:

  • description: A one-line description of the template, in CommonMark syntax.
  • path: The path of the directory to be copied.
  • welcomeText: A block of markdown text to display when a user initializes a new flake based on this template.

Here is an example:

outputs = { self }: {


  templates.rust = {


    path = ./rust;


    description = "A simple Rust/Cargo project";


    welcomeText = ''


      # Simple Rust/Cargo Template


      ## Intended usage


      The intended usage of this flake is...


      ## More info


      - [Rust language](https://www.rust-lang.org/)


      - [Rust on the NixOS Wiki](https://wiki.nixos.org/wiki/Rust)


      - ...


    '';


  };


  templates.default = self.templates.rust;
}

Options

•
--template / -t template
The template to use.

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.
•
--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.