tiup mirror init does not work

[daniel-nichter]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do?

% ./tiup mirror init
Error: initial repository from mirror(https://tiup-mirrors.pingcap.com/) failed: cannot open the initial root.json at /Users/dn/.tiup/bin/root.json

That was run in the root dir of this repo.

Note: I have zero setup of anything TiDB related--a completely empty env. $HOME/.tiup/ doesn't exist. No TI* env vars.

2. What did you expect to see?

Expect tiup mirror init to "Just Work", or give more specific error message about what pre-conditions aren't met.

3. What did you see instead?

No matter how I run it, or what dirs I create, or even if I use a blank /Users/dn/.tiup/bin/root.json, it errors as shown above.

4. What version of TiUP are you using (tiup --version)?

Commit f3f35be
Mac
Local build (just go build)
go1.16

[kolbe]

This is caused by incorrect setup of the TiUP environment. No root.json file was installed after tiup was built. I think the handling for that situation should be much better. #829 and #837 try to address this but I don't think they do a very thorough job.