Lazy index loading (2/2)#1086
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This cache file, which is common to all indexes, tells us in advance which crates have to be loaded because they provide some another crate. E.g., if "gnat" is requested to be loaded, we need to load all gnat_native, and x-compilers. If this file doesn't exist, we can only be sure by loading the full index, at which time the file is regenerated for future use.
E.g. we were loading all gn* when only gnat_native needed to be loaded
Fabien-Chouteau
approved these changes
Jul 18, 2022
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This is the part that deals with the "provides" requirements. Essentially, when the new metadata file
provides.tomldoesn't exist, we revert to full index load. A full index load generates this file for future use.