nix3-store-make-content-addressed(1)

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

Name

nix store make-content-addressed - rewrite a path or closure to content-addressed form

Synopsis

nix store make-content-addressed [option…] installables…

Examples

•   Create a content-addressed representation of the closure of GNU Hello:

    # nix store make-content-addressed nixpkgs#hello
    …
    rewrote '/nix/store/10l19qifk7hjjq47px8m2prqk1gv4isy-hello-2.10' to '/nix/store/5skmmcb9svys5lj3kbsrjg7vf2irid63-hello-2.10'

    Since the resulting paths are content-addressed, they are always trusted and don’t need signatures to copied to another store:

    # nix copy --to /tmp/nix --trusted-public-keys '' /nix/store/5skmmcb9svys5lj3kbsrjg7vf2irid63-hello-2.10

    By contrast, the original closure is input-addressed, so it does need signatures to be trusted:

    # nix copy --to /tmp/nix --trusted-public-keys '' nixpkgs#hello
    cannot add path '/nix/store/gs7mh6q22l1ivxazxja2mjlsdwhw8zg9-libunistring-0.9.10' because it lacks a signature by a trusted key

•   Create a content-addressed representation of the current NixOS system closure:

    # nix store make-content-addressed /run/current-system

Description

This command converts the closure of the store paths specified by installables to content-addressed form.

Nix store paths are usually input-addressed, meaning that the hash part of the store path is computed from the contents of the derivation (i.e., the build-time dependency graph). Input-addressed paths need to be signed by a trusted key if you want to import them into a store, because we need to trust that the contents of the path were actually built by the derivation.

By contrast, in a content-addressed path, the hash part is computed from the contents of the path. This allows the contents of the path to be verified without any additional information such as signatures. This means that a command like

    # nix build /nix/store/5skmmcb9svys5lj3kbsrjg7vf2irid63-hello-2.10 \
        --substituters https://my-cache.example.org

will succeed even if the binary cache https://my-cache.example.org doesn’t present any signatures.

Options

•   --from store-uri

    URL of the source Nix store.

•   --json

    Produce output in JSON format, suitable for consumption by another program.

•   --no-pretty

    Print compact JSON output on a single line, even when the output is a terminal. Some commands may print multiple JSON objects on separate lines.

                See `--pretty`.

•   --pretty

    Print multi-line, indented JSON output for readability.

                Default: indent if output is to a terminal.
                This option is only effective when `--json` is also specified.

•   --stdin

    Read installables from the standard input. No default installable applied.

•   --to store-uri

    URL of the destination Nix store.

  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.

  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.

        DEPRECATED

        Use --no-use-registries instead.

•   --no-update-lock-file

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

•   --no-write-lock-file

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

•   --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). The input path must not be empty. 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.

  Logging-related options

•   --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.

  Options that change the interpretation of installables

•   --all

    Apply the operation to every store path.

•   --derivation

    Operate on the store derivation rather than its outputs.

•   --expr expr

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

•   --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 is read from standard input. Implies --impure.

•   --recursive / -r

    Apply operation to closure of the specified paths.

    Note

    See man nix.conf for overriding configuration settings with command line flags.