"ghcup install cabal --set" world-writable

On Ubuntu 20.10 x86-64, umask 022, "ghcup install cabal --set" makes the cabal exe (cabal-3.2.0.0) world-writable, in fact permission flags 777.

I also have GHCUP_INSTALL_BASE_PREFIX=/usr/local if that matters.

(No, I did not use or need "sudo", I already made /usr/local/.ghcup and below owned by my account.)

Edited Dec 02, 2020 by Albert Lai

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