How should I import my own internal packages in go? - go

Question

I'm trying to make a Go app using the (unoffical) Standard Go Project Layout. What I don't understand is how I should import the packages in the internal directory.
This is my project
Using the Dockerfile, which copies the internal directory to the $GOPATH, it works:
~/go/src/project-layout$ docker build --no-cache .
(...)
Step 5/7 : RUN ls -la /go/src
---> Running in a27235b0bbef
total 24
drwxrwxrwx 1 root root 4096 Apr 29 07:05 .
drwxrwxrwx 1 root root 4096 Apr 12 22:23 ..
-rw-rw-r-- 1 root root 556 Apr 29 06:06 README.md
drwxrwxr-x 3 root root 4096 Apr 29 06:08 app
drwxr-xr-x 1 root root 4096 Apr 29 07:05 myproject
drwxrwxr-x 3 root root 4096 Apr 29 06:11 pkg
Removing intermediate container a27235b0bbef
---> bb924f8f88f0
Step 6/7 : RUN go build -o myapp ./cmd/myapp/main.go
---> Running in 06bd6cd778d2
Removing intermediate container 06bd6cd778d2
---> 31184f9224c8
Step 7/7 : RUN ./myapp
---> Running in baf75d4dd503
Hello World, from myapp main
Hello world, from myapp internals
Hello world, from myprivatelib: 'myapp internal'
Hello world, from myprivatelib: 'myapp main'
Removing intermediate container baf75d4dd503
---> 5747b6b4686f
Successfully built 5747b6b4686f
However, when I try to build locally, I get:
~/go/src/project-layout$ go build -o myapp ./cmd/myapp/main.go
cmd/myapp/main.go:6:2: cannot find package "app/myapp" in any of:
/home/comavn/go/src/project-layout/vendor/app/myapp (vendor tree)
/usr/lib/go-1.10/src/app/myapp (from $GOROOT)
/home/comavn/go/src/app/myapp (from $GOPATH)
cmd/myapp/main.go:7:2: cannot find package "pkg/myprivatelib" in any of:
/home/comavn/go/src/project-layout/vendor/pkg/myprivatelib (vendor tree)
/usr/lib/go-1.10/src/pkg/myprivatelib (from $GOROOT)
/home/comavn/go/src/pkg/myprivatelib (from $GOPATH)
I can get it to work by symlinking internal/app and internal/pkg in the vendor directory, but that seems wrong...
So, what am I doing wrong here? How should I import these internal packages?

Answer 1

I think I found the proper solution: https://github.com/ComaVN/project-layout/commit/6415a8f06dd7fbdcf1c7282bc3ec172c3e145611
You have to import using the project name as well:
import (
"project-layout/internal/app/myapp"
"project-layout/internal/pkg/myprivatelib"
)
Unfortunatly, this does mean that the build depends on the exact directory name used for the project.