This is a quick Go program to install or upgrade your Go runtime by downloading the latest release from golang.org:
% sudo goup
You are running Go 1.10.1 for linux (amd64)
Go 1.10.3 linux amd64 is available in tar format
Download and install? y
Downloading go1.10.3.linux-amd64.tar.gz
Fetching https://dl.google.com/go/go1.10.3.linux-amd64.tar.gz
Downloaded and SHA256 checked
Go upgraded successfully
% go version
go version go1.10.3 linux/amd64
%
It should work for macOS and Linux, patches for Windows compatibility would be welcomed.
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Interactive
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Examines versions to see if there's an upgrade
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Checks SHA256 checksums
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Checks byte count of download
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Not a crufty shell script
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Sets read permissions on unpacked files for use from
sudo -
Allows you to override arch or OS
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Now usable for initial install, if you have a built binary of it
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Slurps the entire downloaded distribution file into RAM.
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Doesn't work on Windows yet.
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If the Go team distributes a tar file that doesn't have everything under a top level "go" directory, it'll fail (and leave junk in your destination directory).
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Doesn't attempt to manage having multiple different versions of Go installed at the same time.