如何调试依赖项包？ 如果我有它的源代码

Question

My Go project depends on package example.com/foo. I am using Go 1.12, so the dependency is automatically pulled in by Go modules. Now, there is an error happening inside of the dependency, I want to debug it by adding log or step by step execution. I can find the source code of the dependency on GitHub but I don't know how to fit it into my project, so that it replaces the dependency which was pulled in by Go modules.

Answer 1

First fetch all the dependency packages into the vendor folder.

go mod vendor

Then, change the source code in that and build your project by specifying to look into vendor folder.

go build -mod=vendor

or

go run -mode=vendor myapp.go