[pacman-dev] [idea] Allow pacman to optionally install from a directory instead of just a .pkg.tar.xz file

[Moses Miller]

Pacman currently only allows installing from .pkg.tar.xz files. Usually,
this makes sense, as packages are compressed server-side. However, this
can become a real problem when installing packages, especially large
packages from the aur; you are wasting cycles compressing a package just
to decompress it a few moments later.

As an example, I have the 'unreal-engine' package installed from the
aur. Unreal engine is a *huge* piece of software, and the compression
actually takes *longer* than the entire building process (on my cpu,
anyway, which has 4 cores + hyperthreading - xz only runs on one core).

Adding this option would cut down quite a lot on the time it takes to
build packages like this, with no downside (that I can see).

Any thoughts?
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