Move packages from rancher/rancher to norman

pkg/resolvehome/home.go

@@ -0,0 +1,39 @@
+package resolvehome
+
+import (
+	"os"
+	"os/user"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+var (
+	homes = []string{"$HOME", "${HOME}", "~"}
+)
+
+func Resolve(s string) (string, error) {
+	for _, home := range homes {
+		if strings.Contains(s, home) {
+			homeDir, err := getHomeDir()
+			if err != nil {
+				return "", errors.Wrap(err, "determining current user")
+			}
+			s = strings.Replace(s, home, homeDir, -1)
+		}
+	}
+
+	return s, nil
+}
+
+func getHomeDir() (string, error) {
+	if os.Getuid() == 0 {
+		return "/root", nil
+	}
+
+	u, err := user.Current()
+	if err != nil {
+		return "", errors.Wrap(err, "determining current user, try set HOME and USER env vars")
+	}
+	return u.HomeDir, nil
+}