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

	      Warning
	      This  program  is	 experimental <../../development/experimental-
	      features.md#xp-feature-nix-command> and its interface is subject
	      to change.

Name
       nix flake lock -	create missing lock file entries

Synopsis
       nix flake lock [option...] flake-url

Examples
         Create the lock file for the flake in	the current directory:

       # nix flake lock
       warning:	creating lock file '/home/myself/repos/testflake/flake.lock':
	Added input 'nix':
	 'github:NixOS/nix/9fab14adbc3810d5cc1f88672fde1eee4358405c' (2023-06-28)
	Added input 'nixpkgs':
	 'github:NixOS/nixpkgs/3d2d8f281a27d466fa54b469b5993f7dde198375' (2023-06-30)

         Add missing inputs to	the lock file for a flake in a	different  di-
	  rectory:

       # nix flake lock	~/repos/another
       warning:	updating lock file '/home/myself/repos/another/flake.lock':
	Added input 'nixpkgs':
	 'github:NixOS/nixpkgs/3d2d8f281a27d466fa54b469b5993f7dde198375' (2023-06-30)

		     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 lock file of a flake (flake.lock) so that it
       contains	 an  up-to-date	 lock  for  every  flake  input	 specified  in
       flake.nix. Lock file entries are	already	up-to-date are not modified.

       If  you	want  to  update  existing  lock entries, use nix flake	update
       <../../command-ref/new-cli/nix3-flake-update.md>

Options
   Common evaluation options
         --arg	<#opt-arg> name	expr

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

         --arg-from-file <#opt-arg-from-file> name path

	  Pass the contents of file path as the	argument  name	to  Nix	 func-
	  tions.

         --arg-from-stdin <#opt-arg-from-stdin> name

	  Pass the contents of stdin as	the argument name to Nix functions.

         --argstr <#opt-argstr> name string

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

         --debugger <#opt-debugger>

	  Start	an interactive environment if evaluation fails.

         --eval-store <#opt-eval-store> store-url

	  The  URL  of	the  Nix  store	<../../store/types/index.md#store-url-
	  format> to use for  evaluation,  i.e.	 to  store  derivations	 (.drv
	  files) and inputs referenced by them.

         --impure <#opt-impure>

	  Allow	access to mutable paths	and repositories.

         --include <#opt-include> / -I	path

	  Add  path  to	 search	 path  entries	used  to  resolve lookup paths
	  <../../language/constructs/lookup-path.md>

	  This option may be given multiple times.

	  Paths	added through -I take precedence over the nix-path  configura-
	  tion	setting	<../../command-ref/conf-file.md#conf-nix-path> and the
	  NIX_PATH environment variable	 <../../command-ref/env-common.md#env-
	  NIX_PATH>.

         --override-flake <#opt-override-flake> original-ref resolved-ref

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

   Common flake-related	options
         --commit-lock-file <#opt-commit-lock-file>

	  Commit changes to the	flake's	lock file.

         --inputs-from	<#opt-inputs-from> flake-url

	  Use the inputs of the	specified flake	as registry entries.

         --no-registries <#opt-no-registries>

	  Don't	allow lookups in the flake registries.

		 DEPRECATED

		 Use --no-use-registries <../../command-ref/conf-file.md#conf-
		 use-registries> instead.

         --no-update-lock-file	<#opt-no-update-lock-file>

	  Do not allow any updates to the flake's lock file.

         --output-lock-file <#opt-output-lock-file> flake-lock-path

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

         --override-input <#opt-override-input> input-path flake-url

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

         --recreate-lock-file <#opt-recreate-lock-file>

	  Recreate the flake's lock file from scratch.

		 DEPRECATED

		 Use  nix  flake update	<../../command-ref/new-cli/nix3-flake-
		 update.md> instead.

         --reference-lock-file	<#opt-reference-lock-file> flake-lock-path

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

         --update-input <#opt-update-input> input-path

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

		 DEPRECATED

		 Use nix flake	update	<../../command-ref/new-cli/nix3-flake-
		 update.md> instead.

   Logging-related options
         --debug <#opt-debug>

	  Set the logging verbosity level to `debug'.

         --log-format <#opt-log-format> format

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

         --print-build-logs <#opt-print-build-logs> / -L

	  Print	full build logs	on standard error.

         --quiet <#opt-quiet>

	  Decrease the logging verbosity level.

         --verbose <#opt-verbose> / -v

	  Increase the logging verbosity level.

   Miscellaneous global	options
         --help <#opt-help>

	  Show usage information.

         --offline <#opt-offline>

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

         --option <#opt-option> name value

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

         --refresh <#opt-refresh>

	  Consider all previously downloaded files out-of-date.

         --repair <#opt-repair>

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

         --version <#opt-version>

	  Show version information.

	  Note

	  See man nix.conf <../../command-ref/conf-file.md#command-line-flags>
	  for overriding configuration settings	with command line flags.

							    nix3-flake-lock(1)

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