Name

       nix flake lock - create missing lock file entries

Synopsis

       nix flake lock [option…] flake-url

Examples

       • Update the nixpkgs and nix inputs of the flake in the current directory:

       # nix flake lock --update-input nixpkgs --update-input nix
       * Updated 'nix': 'github:NixOS/nix/9fab14adbc3810d5cc1f88672fde1eee4358405c' -> 'github:NixOS/nix/8927cba62f5afb33b01016d5c4f7f8b7d0adde3c'
       * Updated 'nixpkgs': 'github:NixOS/nixpkgs/3d2d8f281a27d466fa54b469b5993f7dde198375' -> 'github:NixOS/nixpkgs/a3a3dda3bacf61e8a39258a0ed9c924eeca8e293'

Description

       This  command updates the lock file of a flake (flake.lock) so that it contains a lock for
       every flake input specified in flake.nix. Existing  lock  file  entries  are  not  updated
       unless required by a flag such as --update-input.

       Note that every command that operates on a flake will also update the lock file if needed,
       and supports the same flags. Therefore,

       # nix flake lock --update-input nixpkgs
       # nix build

       is equivalent to:

       # nix build --update-input nixpkgs

       Thus, this command is only useful if you want to update the lock file separately from  any
       other action such as building.

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.

       • --no-update-lock-file
         Do not allow any updates to the flake’s lock file.

       • --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.

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

                                                                               nix3-flake-lock(1)