communicator/ssh: Add type for static passwords

communicator/ssh/password.go

+package ssh
+
+// An implementation of ssh.ClientPassword so that you can use a static
+// string password for the password to ClientAuthPassword.
+type Password string
+
+func (p Password) Password(user string) (string, error) {
+	return string(p), nil
+}

communicator/ssh/password_test.go

+package ssh
+
+import (
+	"code.google.com/p/go.crypto/ssh"
+	"testing"
+)
+
+func TestPassword_Impl(t *testing.T) {
+	var raw interface{}
+	raw = Password("foo")
+	if _, ok := raw.(ssh.ClientPassword); !ok {
+		t.Fatal("Password must implement ClientPassword")
+	}
+}
+
+func TestPasswordPassword(t *testing.T) {
+	p := Password("foo")
+	result, err := p.Password("user")
+	if err != nil {
+		t.Fatalf("err not nil: %s", err)
+	}
+
+	if result != "foo" {
+		t.Fatalf("invalid password: %s", result)
+	}
+}