Re: [Rpm-ecosystem] lazy loading of filelists.xml to speed up dnf

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There is a further optimization for file dependencies not in some whitelist that might be undertaken by depsolvers like dnf: lookup the path in the already installed packages.

The fundamental need for depsolvers resolving a dependency is the ability to traverse a mapping from path to package in order to determine whether there is a "newer" package available so that the package that provides a path can be upgraded.

Resolving the path dynamically to a package name, or even using the existence of a file as a means to resolve a dependency, is a better approach than downloading megabytes of data "just in case".
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