go - How can I open files relative to my GOPATH?

Question

I'm using io/ioutil to read a small text file:

fileBytes, err := ioutil.ReadFile("/absolute/path/to/file.txt")

And that works fine, but this isn't exactly portable. In my case, the files I want to open are in my GOPATH, for example:

/Users/matt/Dev/go/src/github.com/mholt/mypackage/data/file.txt

Since the data folder rides right alongside the source code, I'd love to just specify the relative path:

data/file.txt

But then I get this error:

panic: open data/file.txt: no such file or directory

How can I open files using their relative path, especially if they live alongside my Go code?

(Note that my question is specifically about opening files relative to the GOPATH. Opening files using any relative path in Go is as easy as giving the relative path instead of an absolute path; files are opened relative to the compiled binary's working directory. In my case, I want to open files relative to where the binary was compiled. In hindsight, this is a bad design decision.)

Answer 1

Waitting for answers