nix3-path-info(1)

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

Name
nix path-info - query information about store paths

Synopsis
nix path-info [option…] installables…

Examples

•   Print the store path produced by nixpkgs#hello:

    # nix path-info nixpkgs#hello
    /nix/store/v5sv61sszx301i0x6xysaqzla09nksnd-hello-2.10

•   Show the closure sizes of every path in the current NixOS system closure, sorted by size:

    # nix path-info -rS /run/current-system | sort -nk2
    /nix/store/hl5xwp9kdrd1zkm0idm3kkby9q66z404-empty                                                96
    /nix/store/27324qvqhnxj3rncazmxc4mwy79kz8ha-nameservers                                         112
    …
    /nix/store/539jkw9a8dyry7clcv60gk6na816j7y8-etc                                          5783255504
    /nix/store/zqamz3cz4dbzfihki2mk7a63mbkxz9xq-nixos-system-machine-20.09.20201112.3090c65  5887562256

•   Show a package’s closure size and all its dependencies with human readable sizes:

    # nix path-info -rsSh nixpkgs#rustc
    /nix/store/01rrgsg5zk3cds0xgdsq40zpk6g51dz9-ncurses-6.2-dev      386.7K   69.1M
    /nix/store/0q783wnvixpqz6dxjp16nw296avgczam-libpfm-4.11.0          5.9M   37.4M
    …

•   Check the existence of a path in a binary cache:

    # nix path-info -r /nix/store/blzxgyvrk32ki6xga10phr4sby2xf25q-geeqie-1.5.1 --store https://cache.nixos.org/
    path '/nix/store/blzxgyvrk32ki6xga10phr4sby2xf25q-geeqie-1.5.1' is not valid

•   Print the 10 most recently added paths (using –json and the jq(1) command):

    # nix path-info --json --all | jq -r 'sort_by(.registrationTime)[-11:-1][].path'

•   Show the size of the entire Nix store:

    # nix path-info --json --all | jq 'map(.narSize) | add'
    49812020936

•   Show every path whose closure is bigger than 1 GB, sorted by closure size:

    # nix path-info --json --all -S \
    | jq 'map(select(.closureSize > 1e9)) | sort_by(.closureSize) | map([.path, .closureSize])'
    [
    …,
    [
      "/nix/store/zqamz3cz4dbzfihki2mk7a63mbkxz9xq-nixos-system-machine-20.09.20201112.3090c65",
      5887562256
    ]
    ]

•   Print the path of the store derivation produced by nixpkgs#hello:

    # nix path-info --derivation nixpkgs#hello
    /nix/store/s6rn4jz1sin56rf4qj5b5v8jxjm32hlk-hello-2.10.drv

Description
This command shows information about the store paths produced by installables, or about all paths in the store if you pass --all.

By default, this command only prints the store paths. You can get additional information by passing flags such as --closure-size, --size, --sigs or --json.

    Warning

    Note that nix path-info does not build or substitute the installables you specify. Thus, if the corresponding store paths don’t already exist, this command will fail. You can use nix build to ensure that they exist.

Options

•   --closure-size / -S
    Print the sum of the sizes of the NAR serialisations of the closure of each path.

•   --human-readable / -h
    With -s and -S, print sizes in a human-friendly format such as 5.67G.

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

•   --sigs
    Show signatures.

•   --size / -s
    Print the size of the NAR serialisation of each path.

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.

•   --no-write-lock-file
    Do not write the flake’s newly generated 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).

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 will be read from standard input.

•   --recursive / -r
    Apply operation to closure of the specified paths.