It is not possible using the go get tool. Instead you need to use a third party go package management tool or create your own forks for the packages that you wish to manage more fine grained.
Spoke to a guy that works at Google and he acknowledged this problem/requirement, he said that vendoring which his team used was bulky and they will probably solve it with the official tools soon.
Read more:
- Reference of third party package management tools
- Blog post by golang team discussing the approach for implementing vendoring
Vendoring in Go 1.6
Vendoring has been released from experimental in go 1.6 (after this post was initially written) that makes the process of using specific tags / versions of packages using third party tools easier. go get does still not have the functionality to fetch specific tags or versions.
More about how vendoring works: Understanding and using the vendor folder
Modules in Go 1.11
Go 1.11 has released an experimental features called modules to improve dependency management, they hope to release it as stable in Go 1.12: Information about modules in Go 1.11