dotcloud/docker

package daemon // import "github.com/docker/docker/testutil/daemon"

import (
    "fmt"
    "os"
    "path/filepath"
    "strings"
    "testing"

    "golang.org/x/sys/unix"
    "gotest.tools/v3/assert"
)

func cleanupNetworkNamespace(t testing.TB, d *Daemon) {
    t.Helper()
    // Cleanup network namespaces in the exec root of this
    // daemon because this exec root is specific to this
    // daemon instance and has no chance of getting
    // cleaned up when a new daemon is instantiated with a
    // new exec root.
    filepath.WalkDir(filepath.Join(d.execRoot, "netns"), func(path string, _ os.DirEntry, _ error) error {
        if err := unix.Unmount(path, unix.MNT_DETACH); err != nil && err != unix.EINVAL && err != unix.ENOENT {
            t.Logf("[%s] unmount of %s failed: %v", d.id, path, err)
        }
        os.Remove(path)
        return nil
    })
}

// CgroupNamespace returns the cgroup namespace the daemon is running in
func (d *Daemon) CgroupNamespace(t testing.TB) string {
    link, err := os.Readlink(fmt.Sprintf("/proc/%d/ns/cgroup", d.Pid()))
    assert.NilError(t, err)

    return strings.TrimSpace(link)
}