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lix/src/nix/path-info.md
Qyriad 194ba8a02f docs: guide to installables docs in installable commands' docs 
The installables syntax is not documented in any of the man pages or
docbook pages for any of those individual commands. And while these
commands really should at least peripherally individually document how
installables work, in the meantime we can at least direct people to the
right place.

This commit also clarifies the unexpected fact that `nix profile remove`
and `nix profile upgrade` do *not* take installables.

Change-Id: I3b1453cb197a613bbab639c66a466365c3592c6d
2024-04-29 08:06:05 -06:00

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Note: this command's interface is based heavily around installables, which you may want to read about first (nix --help).

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 '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 --closure-size \
  | 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.

)""