command: migrate doesn't move process to cgroup

add a new annotation for the "system migrate" command to not move the
pause process to a separate cgroup.

The operation is not needed since "system migrate" destroys the pause
process, so there won't be any process left to move to a cgroup.

[NO TESTS NEEDED]

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

2 files changed, 6 insertions, 5 deletions

diff --git a/pkg/domain/infra/abi/system.go b/pkg/domain/infra/abi/system.go
index c603bf246..bc98edd06 100644
--- a/pkg/domain/infra/abi/system.go
+++ b/pkg/domain/infra/abi/system.go
@@ -24,7 +24,6 @@ import (
 	"github.com/containers/storage/pkg/unshare"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
-	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 )
 
@@ -57,7 +56,7 @@ func (ic *ContainerEngine) Info(ctx context.Context) (*define.Info, error) {
 	return info, err
 }
 
-func (ic *ContainerEngine) SetupRootless(_ context.Context, cmd *cobra.Command) error {
+func (ic *ContainerEngine) SetupRootless(_ context.Context, noMoveProcess bool) error {
 	// do it only after podman has already re-execed and running with uid==0.
 	hasCapSysAdmin, err := unshare.HasCapSysAdmin()
 	if err != nil {
@@ -104,6 +103,9 @@ func (ic *ContainerEngine) SetupRootless(_ context.Context, cmd *cobra.Command)
 	if became {
 		os.Exit(ret)
 	}
+	if noMoveProcess {
+		return nil
+	}
 
 	// if there is no pid file, try to join existing containers, and create a pause process.
 	ctrs, err := ic.Libpod.GetRunningContainers()
@@ -118,6 +120,7 @@ func (ic *ContainerEngine) SetupRootless(_ context.Context, cmd *cobra.Command)
 	}
 
 	became, ret, err = rootless.TryJoinFromFilePaths(pausePidPath, true, paths)
+
 	if err := movePauseProcessToScope(ic.Libpod); err != nil {
 		conf, err2 := ic.Config(context.Background())
 		if err2 != nil {
@@ -148,7 +151,6 @@ func movePauseProcessToScope(r *libpod.Runtime) error {
 	if err != nil {
 		return errors.Wrapf(err, "could not get pause process pid file path")
 	}
-
 	data, err := ioutil.ReadFile(pausePidPath)
 	if err != nil {
 		return errors.Wrapf(err, "cannot read pause pid file")
diff --git a/pkg/domain/infra/tunnel/system.go b/pkg/domain/infra/tunnel/system.go
index 7400d3771..6b43cf038 100644
--- a/pkg/domain/infra/tunnel/system.go
+++ b/pkg/domain/infra/tunnel/system.go
@@ -7,14 +7,13 @@ import (
 	"github.com/containers/podman/v3/libpod/define"
 	"github.com/containers/podman/v3/pkg/bindings/system"
 	"github.com/containers/podman/v3/pkg/domain/entities"
-	"github.com/spf13/cobra"
 )
 
 func (ic *ContainerEngine) Info(ctx context.Context) (*define.Info, error) {
 	return system.Info(ic.ClientCtx, nil)
 }
 
-func (ic *ContainerEngine) SetupRootless(_ context.Context, cmd *cobra.Command) error {
+func (ic *ContainerEngine) SetupRootless(_ context.Context, noMoveProcess bool) error {
 	panic(errors.New("rootless engine mode is not supported when tunneling"))
 }