github.com/docker/docker@v299999999.0.0-20200612211812-aaf470eca7b5+incompatible/testutil/daemon/daemon_unix.go (about)

     1  // +build !windows
     2  
     3  package daemon // import "github.com/docker/docker/testutil/daemon"
     4  
     5  import (
     6  	"fmt"
     7  	"os"
     8  	"os/exec"
     9  	"path/filepath"
    10  	"strings"
    11  	"syscall"
    12  	"testing"
    13  
    14  	"golang.org/x/sys/unix"
    15  	"gotest.tools/v3/assert"
    16  )
    17  
    18  func cleanupNetworkNamespace(t testing.TB, d *Daemon) {
    19  	t.Helper()
    20  	// Cleanup network namespaces in the exec root of this
    21  	// daemon because this exec root is specific to this
    22  	// daemon instance and has no chance of getting
    23  	// cleaned up when a new daemon is instantiated with a
    24  	// new exec root.
    25  	netnsPath := filepath.Join(d.execRoot, "netns")
    26  	filepath.Walk(netnsPath, func(path string, info os.FileInfo, err error) error {
    27  		if err := unix.Unmount(path, unix.MNT_DETACH); err != nil && err != unix.EINVAL && err != unix.ENOENT {
    28  			t.Logf("[%s] unmount of %s failed: %v", d.id, path, err)
    29  		}
    30  		os.Remove(path)
    31  		return nil
    32  	})
    33  }
    34  
    35  // CgroupNamespace returns the cgroup namespace the daemon is running in
    36  func (d *Daemon) CgroupNamespace(t testing.TB) string {
    37  	link, err := os.Readlink(fmt.Sprintf("/proc/%d/ns/cgroup", d.Pid()))
    38  	assert.NilError(t, err)
    39  
    40  	return strings.TrimSpace(link)
    41  }
    42  
    43  // SignalDaemonDump sends a signal to the daemon to write a dump file
    44  func SignalDaemonDump(pid int) {
    45  	unix.Kill(pid, unix.SIGQUIT)
    46  }
    47  
    48  func signalDaemonReload(pid int) error {
    49  	return unix.Kill(pid, unix.SIGHUP)
    50  }
    51  
    52  func setsid(cmd *exec.Cmd) {
    53  	if cmd.SysProcAttr == nil {
    54  		cmd.SysProcAttr = &syscall.SysProcAttr{}
    55  	}
    56  	cmd.SysProcAttr.Setsid = true
    57  }