me own pihole

csi-s3/storage-csi-s3/pkg/s3/util.go

@@ -0,0 +1,106 @@
+package s3
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/mitchellh/go-ps"
+	"k8s.io/kubernetes/pkg/util/mount"
+
+	"github.com/golang/glog"
+)
+
+func waitForProcess(p *os.Process, backoff int) error {
+	if backoff == 20 {
+		return fmt.Errorf("Timeout waiting for PID %v to end", p.Pid)
+	}
+	cmdLine, err := getCmdLine(p.Pid)
+	if err != nil {
+		glog.Warningf("Error checking cmdline of PID %v, assuming it is dead: %s", p.Pid, err)
+		return nil
+	}
+	if cmdLine == "" {
+		// ignore defunct processes
+		// TODO: debug why this happens in the first place
+		// seems to only happen on k8s, not on local docker
+		glog.Warning("Fuse process seems dead, returning")
+		return nil
+	}
+	if err := p.Signal(syscall.Signal(0)); err != nil {
+		glog.Warningf("Fuse process does not seem active or we are unprivileged: %s", err)
+		return nil
+	}
+	glog.Infof("Fuse process with PID %v still active, waiting...", p.Pid)
+	time.Sleep(time.Duration(backoff*100) * time.Millisecond)
+	return waitForProcess(p, backoff+1)
+}
+
+func waitForMount(path string, timeout time.Duration) error {
+	var elapsed time.Duration
+	var interval = 10 * time.Millisecond
+	for {
+		notMount, err := mount.New("").IsNotMountPoint(path)
+		if err != nil {
+			return err
+		}
+		if !notMount {
+			return nil
+		}
+		time.Sleep(interval)
+		elapsed = elapsed + interval
+		if elapsed >= timeout {
+			return errors.New("Timeout waiting for mount")
+		}
+	}
+}
+
+func findFuseMountProcess(path string) (*os.Process, error) {
+	processes, err := ps.Processes()
+	if err != nil {
+		return nil, err
+	}
+	for _, p := range processes {
+		cmdLine, err := getCmdLine(p.Pid())
+		if err != nil {
+			glog.Errorf("Unable to get cmdline of PID %v: %s", p.Pid(), err)
+			continue
+		}
+		if strings.Contains(cmdLine, path) {
+			glog.Infof("Found matching pid %v on path %s", p.Pid(), path)
+			return os.FindProcess(p.Pid())
+		}
+	}
+	return nil, nil
+}
+
+func getCmdLine(pid int) (string, error) {
+	cmdLineFile := fmt.Sprintf("/proc/%v/cmdline", pid)
+	cmdLine, err := ioutil.ReadFile(cmdLineFile)
+	if err != nil {
+		return "", err
+	}
+	return string(cmdLine), nil
+}
+
+func createLoopDevice(device string) error {
+	if _, err := os.Stat(device); !os.IsNotExist(err) {
+		return nil
+	}
+	args := []string{
+		device,
+		"b", "7", "0",
+	}
+	cmd := exec.Command("mknod", args...)
+
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("Error configuring loop device: %s", out)
+	}
+	return nil
+}