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nix-super/src/nix/path-info.md
John Ericson cc46ea1630 Make nix path-info --json return an object not array 
Before it returned a list of JSON objects with store object information,
including the path in each object. Now, it maps the paths to JSON
objects with the metadata sans path.

This matches how `nix derivation show` works.

Quite hillariously, none of our existing functional tests caught this
change to `path-info --json` though they did use it. So just new
functional tests need to be added.
2023-11-06 11:06:31 -05:00

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R""(

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 --recursive --closure-size /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 --recursive --size --closure-size --human-readable 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 --recursive /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 'to_entries | sort_by(.value.registrationTime) | .[-11:-1][] | .key'

  • 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 --closure-size \
  | jq 'map_values(.closureSize | select(. < 1e9)) | to_entries | sort_by(.value)'
[
  …,
  {
    .key = "/nix/store/zqamz3cz4dbzfihki2mk7a63mbkxz9xq-nixos-system-machine-20.09.20201112.3090c65",
    .value = 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.

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