Merge pull request #8556 from mheon/fix_8539

Use Libpod tmpdir for pause path

libpod/reset.go

@@ -46,7 +46,7 @@ func (r *Runtime) Reset(ctx context.Context) error {
 		}
 	}
 
-	if err := stopPauseProcess(); err != nil {
+	if err := r.stopPauseProcess(); err != nil {
 		logrus.Errorf("Error stopping pause process: %v", err)
 	}
 

libpod/runtime.go

@@ -472,7 +472,7 @@ func makeRuntime(ctx context.Context, runtime *Runtime) (retErr error) {
 		// we will need to access the storage.
 		if os.Geteuid() != 0 {
 			aliveLock.Unlock() // Unlock to avoid deadlock as BecomeRootInUserNS will reexec.
-			pausePid, err := util.GetRootlessPauseProcessPidPath()
+			pausePid, err := util.GetRootlessPauseProcessPidPathGivenDir(runtime.config.Engine.TmpDir)
 			if err != nil {
 				return errors.Wrapf(err, "could not get pause process pid file path")
 			}
@@ -538,6 +538,15 @@ func makeRuntime(ctx context.Context, runtime *Runtime) (retErr error) {
 	return nil
 }
 
+// TmpDir gets the current Libpod temporary files directory.
+func (r *Runtime) TmpDir() (string, error) {
+	if !r.valid {
+		return "", define.ErrRuntimeStopped
+	}
+
+	return r.config.Engine.TmpDir, nil
+}
+
 // GetConfig returns a copy of the configuration used by the runtime
 func (r *Runtime) GetConfig() (*config.Config, error) {
 	r.lock.RLock()

libpod/runtime_migrate.go

@@ -18,9 +18,9 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
-func stopPauseProcess() error {
+func (r *Runtime) stopPauseProcess() error {
 	if rootless.IsRootless() {
-		pausePidPath, err := util.GetRootlessPauseProcessPidPath()
+		pausePidPath, err := util.GetRootlessPauseProcessPidPathGivenDir(r.config.Engine.TmpDir)
 		if err != nil {
 			return errors.Wrapf(err, "could not get pause process pid file path")
 		}
@@ -98,5 +98,5 @@ func (r *Runtime) migrate(ctx context.Context) error {
 		}
 	}
 
-	return stopPauseProcess()
+	return r.stopPauseProcess()
 }

libpod/runtime_migrate_unsupported.go

@@ -10,6 +10,6 @@ func (r *Runtime) migrate(ctx context.Context) error {
 	return nil
 }
 
-func stopPauseProcess() error {
+func (r *Runtime) stopPauseProcess() error {
 	return nil
 }

pkg/domain/infra/abi/system.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 
 	"github.com/containers/common/pkg/config"
+	"github.com/containers/podman/v2/libpod"
 	"github.com/containers/podman/v2/libpod/define"
 	"github.com/containers/podman/v2/pkg/cgroups"
 	"github.com/containers/podman/v2/pkg/domain/entities"
@@ -86,7 +87,11 @@ func (ic *ContainerEngine) SetupRootless(_ context.Context, cmd *cobra.Command)
 		return nil
 	}
 
-	pausePidPath, err := util.GetRootlessPauseProcessPidPath()
+	tmpDir, err := ic.Libpod.TmpDir()
+	if err != nil {
+		return err
+	}
+	pausePidPath, err := util.GetRootlessPauseProcessPidPathGivenDir(tmpDir)
 	if err != nil {
 		return errors.Wrapf(err, "could not get pause process pid file path")
 	}
@@ -112,7 +117,7 @@ func (ic *ContainerEngine) SetupRootless(_ context.Context, cmd *cobra.Command)
 	}
 
 	became, ret, err = rootless.TryJoinFromFilePaths(pausePidPath, true, paths)
-	if err := movePauseProcessToScope(); err != nil {
+	if err := movePauseProcessToScope(ic.Libpod); err != nil {
 		conf, err := ic.Config(context.Background())
 		if err != nil {
 			return err
@@ -133,8 +138,12 @@ func (ic *ContainerEngine) SetupRootless(_ context.Context, cmd *cobra.Command)
 	return nil
 }
 
-func movePauseProcessToScope() error {
-	pausePidPath, err := util.GetRootlessPauseProcessPidPath()
+func movePauseProcessToScope(r *libpod.Runtime) error {
+	tmpDir, err := r.TmpDir()
+	if err != nil {
+		return err
+	}
+	pausePidPath, err := util.GetRootlessPauseProcessPidPathGivenDir(tmpDir)
 	if err != nil {
 		return errors.Wrapf(err, "could not get pause process pid file path")
 	}

pkg/util/utils_supported.go

@@ -99,7 +99,8 @@ func GetRootlessConfigHomeDir() (string, error) {
 }
 
 // GetRootlessPauseProcessPidPath returns the path to the file that holds the pid for
-// the pause process
+// the pause process.
+// DEPRECATED - switch to GetRootlessPauseProcessPidPathGivenDir
 func GetRootlessPauseProcessPidPath() (string, error) {
 	runtimeDir, err := GetRuntimeDir()
 	if err != nil {
@@ -107,3 +108,13 @@ func GetRootlessPauseProcessPidPath() (string, error) {
 	}
 	return filepath.Join(runtimeDir, "libpod", "pause.pid"), nil
 }
+
+// GetRootlessPauseProcessPidPathGivenDir returns the path to the file that
+// holds the PID of the pause process, given the location of Libpod's temporary
+// files.
+func GetRootlessPauseProcessPidPathGivenDir(libpodTmpDir string) (string, error) {
+	if libpodTmpDir == "" {
+		return "", errors.Errorf("must provide non-empty tmporary directory")
+	}
+	return filepath.Join(libpodTmpDir, "pause.pid"), nil
+}

pkg/util/utils_windows.go

@@ -25,6 +25,12 @@ func GetRootlessPauseProcessPidPath() (string, error) {
 	return "", errors.Wrap(errNotImplemented, "GetRootlessPauseProcessPidPath")
 }
 
+// GetRootlessPauseProcessPidPath returns the path to the file that holds the pid for
+// the pause process
+func GetRootlessPauseProcessPidPathGivenDir(unused string) (string, error) {
+	return "", errors.Wrap(errNotImplemented, "GetRootlessPauseProcessPidPath")
+}
+
 // GetRuntimeDir returns the runtime directory
 func GetRuntimeDir() (string, error) {
 	return "", errors.New("this function is not implemented for windows")