How to import imported package's vendor package - go

Question

I am using etcd's wal package (https://godoc.org/github.com/coreos/etcd/wal) to do write-ahead logging. wal has go.uber.org/zap in its vendor packages. In wal's create function func Create(lg *zap.Logger, dirpath string, metadata []byte) (*WAL, error), I need to pass in zap.Logger.
I have tried to import go.uber.org/zap but go compiler complains "type mismatch" when I pass in zap.Logger.
package main
import (
"github.com/coreos/etcd/wal"
)
func check(e error) {
if e != nil {
panic(e)
}
}
func main() {
metadata := []byte{}
w, err := wal.Create(zap.NewExample(), "/tmp/hello", metadata)
// err := w.Save(s, ents)
}
How should I use zap.Logger in my project?

Answer 1

It seems like the package github.com/coreos/etcd/wal is not meant to be used outside of the etcd project. If you really need to use it, please, follow the steps below.
Place the following code in the $GOPATH/src/yourpackage/main.go file.
package main
import (
"fmt"
"go.etcd.io/etcd/wal"
"go.uber.org/zap"
)
func main() {
metadata := []byte{}
w, err := wal.Create(zap.NewExample(), "/tmp/hello", metadata)
fmt.Println(w, err)
}
mkdir $GOPATH/src/yourpackage/vendor
cp -r $GOPATH/src/go.etcd.io $GOPATH/src/yourpackage/vendor/
mv $GOPATH/src/yourpackage/vendor/go.etcd.io/etcd/vendor/go.uber.org $GOPATH/src/yourpackage/vendor/
go build yourpackage