nix why-depends
Show why a package depends on another package. More information: https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-why-depends.html.
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Show why the currently running NixOS system requires a certain store path:
nix why-depends {{/run/current-system}} {{/nix/store/...}} -
Show why a package from nixpkgs requires another package as a build-time dependency:
nix why-depends --derivation {{nixpkgs#dependent}} {{nixpkgs#dependency}}
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