Common evaluation options¶

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--arg name expr

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

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--arg-from-file name path

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

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--arg-from-stdin name

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

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--argstr name string

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

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--debugger

Start an interactive environment if evaluation fails.

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--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.

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--impure

Allow access to mutable paths and repositories.

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--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.

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--override-flake original-ref resolved-ref

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

Common flake-related options¶

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--commit-lock-file

Commit changes to the flake’s lock file.

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--inputs-from flake-url

Use the inputs of the specified flake as registry entries.

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--no-registries

Don’t allow lookups in the flake registries.

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--no-update-lock-file

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

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--no-write-lock-file

Do not write the flake’s newly generated lock file.

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

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

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--override-input input-path flake-url

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

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--recreate-lock-file

Recreate the flake’s lock file from scratch.

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

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

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--update-input input-path

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

Logging-related options¶

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--debug

Set the logging verbosity level to ‘debug’.

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--log-format format

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

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--print-build-logs / -L

Print full build logs on standard error.

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--quiet

Decrease the logging verbosity level.

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--verbose / -v

Increase the logging verbosity level.

Miscellaneous global options¶

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--help

Show usage information.

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--offline

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

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--option name value

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

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--refresh

Consider all previously downloaded files out-of-date.

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--repair

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

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--version

Show version information.

Options that change the interpretation of installables¶

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--expr expr

Interpret installables as attribute paths relative to the Nix expression expr.

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--file / -f file

Interpret installables as attribute paths relative to the Nix expression stored in file. If file is the character -, then a Nix expression will be read from standard input. Implies --impure.