proposal: dl/gotip: enable configuring install path

[willfaught]

Proposal Details

Currently, gotip installs to ~/sdk on macOS. This is fine for one-off uses, where I delete gotip and ~/sdk afterward, but if I want to keep gotip around, it can't stay there. I have a particular organization to things, and I don't put arbitrary stuff in ~.

How about having an environment variable like GOTIP_PATH or a flag like -gotip-path (or both, one overriding the other) that you can set however you like, defaulting to ~/sdk (or ~ or ~/Library/Application Support/gotip (on macOS))?

[ianlancetaylor]

CC @golang/release

[dmitshur]

I believe this is the same as issue #26520, except that one is about all of the golang.org/dl/go1.N.M commands, not just the gotip one. In that issue, one of the suggested names for a environment variable to control this was GOSDK.

[seankhliao]

Duplicate of #26520

[willfaught]

@seankhliao Can you put gotip in the title of the other one so people can find it?