clean up socket and pid files from podman machine

to avoid segvs, we should clean up as much of the socket and regular
files from podman machine as possible on stop.  also, on start, we
should add logic to remove these files before starting in case the start
process is stopped prematurely (due to an error for example).

[NO TESTS NEEDED]

Signed-off-by: Brent Baude <bbaude@redhat.com>

1 files changed, 17 insertions, 3 deletions

diff --git a/pkg/machine/qemu/machine.go b/pkg/machine/qemu/machine.go
index 646c84aba..ac70357c6 100644
--- a/pkg/machine/qemu/machine.go
+++ b/pkg/machine/qemu/machine.go
@@ -244,6 +244,7 @@ func (v *MachineVM) Start(name string, _ machine.StartOptions) error {
 		qemuSocketConn net.Conn
 		wait           time.Duration = time.Millisecond * 500
 	)
+
 	if err := v.startHostNetworking(); err != nil {
 		return errors.Errorf("unable to start host networking: %q", err)
 	}
@@ -264,7 +265,11 @@ func (v *MachineVM) Start(name string, _ machine.StartOptions) error {
 	if err != nil {
 		return err
 	}
-
+	// If the qemusocketpath exists and the vm is off/down, we should rm
+	// it before the dial as to avoid a segv
+	if err := os.Remove(qemuSocketPath); err != nil && !errors.Is(err, os.ErrNotExist) {
+		logrus.Warn(err)
+	}
 	for i := 0; i < 6; i++ {
 		qemuSocketConn, err = net.Dial("unix", qemuSocketPath)
 		if err == nil {
@@ -352,7 +357,7 @@ func (v *MachineVM) Stop(name string, _ machine.StopOptions) error {
 	if _, err = qmpMonitor.Run(input); err != nil {
 		return err
 	}
-	_, pidFile, err := v.getSocketandPid()
+	qemuSocketFile, pidFile, err := v.getSocketandPid()
 	if err != nil {
 		return err
 	}
@@ -373,7 +378,16 @@ func (v *MachineVM) Stop(name string, _ machine.StopOptions) error {
 	if p == nil && err != nil {
 		return err
 	}
-	return p.Kill()
+	// Kill the process
+	if err := p.Kill(); err != nil {
+		return err
+	}
+	// Remove the pidfile
+	if err := os.Remove(pidFile); err != nil && !errors.Is(err, os.ErrNotExist) {
+		logrus.Warn(err)
+	}
+	// Remove socket
+	return os.Remove(qemuSocketFile)
 }
 
 // NewQMPMonitor creates the monitor subsection of our vm