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moby--moby/builder/dockerfile/dispatchers_unix.go

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// +build !windows
package dockerfile
import (
"fmt"
"os"
"path/filepath"
)
// normaliseWorkdir normalises a user requested working directory in a
// platform sematically consistent way.
func normaliseWorkdir(current string, requested string) (string, error) {
if requested == "" {
return "", fmt.Errorf("cannot normalise nothing")
}
current = filepath.FromSlash(current)
requested = filepath.FromSlash(requested)
if !filepath.IsAbs(requested) {
return filepath.Join(string(os.PathSeparator), current, requested), nil
}
return requested, nil
}