DERPER: Fails to install derper with new go version scheme

[laqua-stack]

What is the issue?

When I try to install derper with the current go version 1.22.1 I receive the following error:

go: downloading tailscale.com v1.63.0-pre.0.20240327135352-66e4d843c138
go: tailscale.com/cmd/derper@main (in tailscale.com@v1.63.0-pre.0.20240327135352-66e4d843c138): go.mod:3: invalid go version '1.22.0': must match format 1.23

this is issue is likely linked to golang/go#61888

Steps to reproduce

install latest go.
sudo rm -rf /usr/local/go && sudo tar -C /usr/local -xzf go1.22.1.linux-amd64.tar.gz

try to install derper
go install tailscale.com/cmd/derper@main

Are there any recent changes that introduced the issue?

go changed their verison scheme to follow 1.xy.z instead of previously 1.xy

see also
golang/go#63370
golang/go#61888

OS

Linux

OS version

Ubuntu 22.04

Tailscale version

1.62.1

Other software

go 1.22.1

Bug report

BUG-c87297b6ad6a6e94cedff582a375fdcd933c49f2da8d6bb37a8bdcae09964a21-20240327174030Z-f3b8d2aa7589d308

[rossminney]

Also running into this issue. It almost definitely is related the versioning scheme change.

[laqua-stack]

I found a solution, but the bug was just 40 cm away from the computer.

• Update to the latest go version:
  sudo rm -rf /usr/local/go && sudo tar -C /usr/local -xzf go1.22.1.linux-amd64.tar.gz will install the latest tar after downloading it.

• Be aware that the current instructions on golang install/tar the files to /usr/local/bin and not to /usr/bin

• Make sure that there is not already a go version under /usr/bin and especially not in your PATH env var echo "$PATH" which go

• Or use absolute path to your go binary directly
  /usr/local/bin/go install tailscale.com/cmd/derper@main did work for me.

Maybe, there can be a hint on the tailscale custom derp documentation page.

[kelivel]

Hi @laqua-stack, glad you were able to sort that out! I just tried installing a DERP server on two Ubuntu devices using the same steps you recorded, but with version 1.22.2, and I wasn't able to reproduce the behavior you saw. My DERP installed successfully with no error. Can you reproduce the same behavior now with 1.22.2?

[laqua-stack]

Hi @kelivel,
thank you for following up this issue.
The problem was that I had another go version (1.18 in my case) lying under /usr/bin/go that had priority since it was first in the PATH variable. I thought that installing it according to golang’s instruction would replace it. But, obviously it is placed under /usr/local/bin/go instead.

I left this issue open to discuss the possibility to get a hint in the tailscale docs. Obviously, I was not the only one trapped 🤪

[tallmega]

go install tailscale.com/cmd/derper@latest
go: tailscale.com/cmd/derper@latest (in tailscale.com@v1.76.6): go.mod:3: invalid go version '1.23.1': must match format 1.23