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// +build linux
/*
* umoci: Umoci Modifies Open Containers' Images
* Copyright (C) 2016-2020 SUSE LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package testutils
import (
"os"
"testing"
"golang.org/x/sys/unix"
)
// MakeReadOnly makes the given path read-only (by bind-mounting it as "ro").
// TODO: This should be done through an interface restriction in the test
// (which is then backed up by the readonly mount if necessary). The fact
// this test is necessary is a sign that we need a better split up of the
// CAS interface.
func MakeReadOnly(t *testing.T, path string) {
if os.Geteuid() != 0 {
t.Skip("readonly tests only work with root privileges")
}
t.Logf("mounting %s as readonly", path)
if err := unix.Mount(path, path, "", unix.MS_BIND|unix.MS_RDONLY, ""); err != nil {
t.Fatalf("mount %s as ro: %s", path, err)
}
if err := unix.Mount("none", path, "", unix.MS_BIND|unix.MS_REMOUNT|unix.MS_RDONLY, ""); err != nil {
t.Fatalf("mount %s as ro: %s", path, err)
}
}
// MakeReadWrite undos the effect of MakeReadOnly.
func MakeReadWrite(t *testing.T, path string) {
if os.Geteuid() != 0 {
t.Skip("readonly tests only work with root privileges")
}
t.Logf("mounting %s as readwrite", path)
if err := unix.Unmount(path, unix.MNT_DETACH); err != nil {
t.Fatalf("unmount %s: %s", path, err)
}
}
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