如何可靠地使项目扎根？

Question

For now I used runtime.Caller(0) in combination with path.Dir and filepath.Abs to get the path to the currently executed file and get the project root relative to it.

So lets say I've a folder structure like this:

$GOPATH/src/example.org/myproject
$GOPATH/src/example.org/myproject/main.go
$GOPATH/src/example.org/myproject/path
$GOPATH/src/example.org/myproject/path/loader.go

If I want my project root I call the loader.go which in turn gets its path with runtime.Caller(0) and then goes up one folder to reach the project root.

The problem is when using go test -cover the executed file is not in its normal place anymore but in a special sub directory for the testing and coverage analysis.
runtime.Caller(0) gives me the following:

example.org/myproject/path/_test/_obj_/loader.go

Running it through path.Dir and filepath.Abs will give me:

$GOPATH/src/example.org/myproject/path/example.org/myproject/path/_test/_obj_

When I go up from there I won't reach the project root but something totally different obviously. So my questions stands:
Is there any reliable way of getting the project root?

Answer 1

You can build it from the $GOPATH env variable:

gp := os.Getenv("GOPATH")
ap := path.Join(gp, "src/example.org/myproject")
fmt.Println(ap)

That will yield the absolute path to your paroject dir:

/path/to/gopath/src/example.org/myproject