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

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

nix flake update - update flake lock file

nix flake update [option…] inputs…

•
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 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.

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.

•
--flake flake-url
The flake to operate on. Default is the current directory.

•
--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.
•
--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.
•
--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.

•
--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.