Why is \"Use of Internal Package Not Allowed\" Error Occurring in My Forked Go Project?

Go: Understanding 'Use of Internal Package Not Allowed' Error in Forked Projects

When working with forked Go repositories, it's essential to comprehend the implications of repository structure and dependency paths.

Consider a forked repository, such as "zoono/go-ethereum", originating from the base repository "ethereum/go-ethereum." The error encountered while running "go test .":

eth/api.go:37:2: use of internal package not allowed

indicates that the code attempts to access an internal package within the original repository, namely "github.com/ethereum/go-ethereum/internal/ethapi."

Forking and Dependency Paths

For successful operation, Go projects and their dependencies adhere to specific directory structures and import paths. Forking a repository does not alter the dependency paths within the code, which are typically relative to the original repository. This results in the error when attempting to run tests against the forked code, as the dependency paths are no longer valid.

Addressing the Error

To resolve this error, it's crucial to maintain the original repository's directory structure within the forked repository. Additionally, ensure that the package import paths in your code reflect the forked repository rather than the original one. This involves:

1. Cloning your forked repository in the correct directory structure:

   export GOPATH=$HOME/gocodez
   mkdir -p $GOPATH/src/github.com/zoono
   cd $GOPATH/src/github.com/zoono
   git clone [email protected]:<username>/go-ethereum

2. Modifying package import paths in your code to match the forked repository:

   // Before
   import "github.com/ethereum/go-ethereum/internal/ethapi"
   
   // After
   import "github.com/zoono/go-ethereum/internal/ethapi"

By adhering to these guidelines, you can fork and work with Go repositories effectively, ensuring seamless testing and execution of your code.

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