Comment by pxc
1 day ago
> It’s possible to imagine some kind of cached-deltas scheme to get faster/smaller updates
I think the snix¹ folks are working on something like this for the binary caches— the greater granularity of the content-addressing offers morally the same kind of optimization as delta RPMs: you can download less of what you don't need to re-download.
But I'm not aware of any current efforts to let people download the Nixpkgs tree itself more efficiently. Somehow caching Git deltas would be cool. But I'd expect that kind of optimization to come from a company that runs a Git forge, if it's generally viable, and to benefit many projects other than Nix and Nixpkgs.
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Yes indeed. That said nix typically throws away the .git dir so it would require some work to adapt a solution to nix that operates at the git repo level.
The ideal for nix would be “I have all content at commit X and need the deltas for content at commit Y” and i suspect nix would be fairly unique in being able to benefit from that. To the point that it might actually make sense to just implement the fact git repo syncs and have a local client serving those tarballs to the nix daemon.