Cache should deduplicate identical packages between host and VM #9706
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Description
The problem you're addressing (if any)
host-DIST
and vm-DIST
will have many identical packages. Downloading and storing them multiple times is wasteful. Even though it is not possible to share the chroots (#9705 (comment)), the actual packages can be shared, as they are immutable.
The solution you'd like
Download and store the identical packages only once.
The value to a user, and who that user might be
All contributors who build packages for both host and guest will benefit from fewer redundant downloads.
Completion criteria checklist
(This section is for developer use only. Please do not modify it.)
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