John Ericson
256f3e3063
Instead of having a bunch of optional fields, have a few subclasses which can have mandatory fields. Additionally, the new `getExtraPathInfo`, and `nixpkgsFlakeRef`, are moved to `InstallableValue`. I did these things because https://github.com/NixOS/rfcs/pull/134 ; with these things moved to `InstallableValue`, the base `Installable` no longer depends on libexpr! This is a major step towards that. Also, add a bunch of doc comments for sake of the internal API docs.
Nix
Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.
Installation
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