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go get <meta> tag

This note descibes how Golang figures out where to clone a dependency from.

How it works

Go documents the functionality here: Remote import paths.

This is the short version:

When running go get git.domain.com/foo/bar, go does the following:

  1. Fetch https://git.domain.com/foo/bar?go-get=1
  2. Check if that page contains a meta tag like this (could also be a https url):
<meta name="go-import" content="git.domain.com git [email protected]:foo/bar.git">
  1. Verify that git.domain.com contains the same meta tag
  2. Git clone [email protected]:foo/bar.git into $GOPATH/src/git.domain.com/foo

The Problem

If you’re using packages hosted on an internal git instance (e.g. GitLab), you are going to be in trouble. GitLab for example shows the https url in the meta-tag, so go get will prompt for authentication.

Solutions

The best solution would be to be able to configure GitLab to show the ssh url instead of https. Until then, here are a few approaches, choose the one that fit’s your flow.

Customize it in the ~~/.ssh/config~

In my opinion this is the best solution:

[url "[email protected]:"]
  insteadOf = "https://git.domain.com"

Drawback: You have to configure this on every host.

Build your own discovery service

You could add your own service on some domain (e.g. go.domain.com or even add it to your company website) which contains the correct meta tag with the ssh url.

Drawback: You have an additional service which can break.

Use `.git` in your import paths

If you run go get git.domain.com/foo/bar.git and import it this way, i it will fetch the git URL without checking the <meta> tag.

Drawback: You have to remember adding .git and it’s not really common.