Make multi-container the default mode for runsc

And remove multicontainer option.

PiperOrigin-RevId: 215236981
Change-Id: I9fd1d963d987e421e63d5817f91a25c819ced6cb

3 files changed, 8 insertions, 15 deletions

diff --git a/runsc/boot/config.go b/runsc/boot/config.go
index 01da535af..cd977c8a5 100644
--- a/runsc/boot/config.go
+++ b/runsc/boot/config.go
@@ -193,10 +193,6 @@ type Config struct {
 	// disabled. Pardon the double negation, but default to enabled is important.
 	DisableSeccomp bool
 
-	// MultiContainer enables multiple containers support inside one sandbox.
-	// TODO: Remove this when multiple container is fully supported.
-	MultiContainer bool
-
 	// SpecFile is the file containing the OCI spec.
 	SpecFile string
 
@@ -224,7 +220,6 @@ func (c *Config) ToFlags() []string {
 		"--debug-log-dir=" + c.DebugLogDir,
 		"--file-access=" + c.FileAccess.String(),
 		"--overlay=" + strconv.FormatBool(c.Overlay),
-		"--multi-container=" + strconv.FormatBool(c.MultiContainer),
 		"--network=" + c.Network.String(),
 		"--log-packets=" + strconv.FormatBool(c.LogPackets),
 		"--platform=" + c.Platform.String(),
diff --git a/runsc/boot/fs.go b/runsc/boot/fs.go
index 9e8fea7e1..42e011beb 100644
--- a/runsc/boot/fs.go
+++ b/runsc/boot/fs.go
@@ -85,14 +85,14 @@ func (f *fdDispenser) empty() bool {
 // and all mounts. 'rootCtx' is used to walk directories to find mount points.
 func createMountNamespace(userCtx context.Context, rootCtx context.Context, spec *specs.Spec, conf *Config, goferFDs []int) (*fs.MountNamespace, error) {
 	mounts := compileMounts(spec)
-	if conf.MultiContainer {
-		// Create a tmpfs mount where we create and mount a root filesystem for
-		// each child container.
-		mounts = append(mounts, specs.Mount{
-			Type:        tmpfs,
-			Destination: ChildContainersDir,
-		})
-	}
+
+	// Create a tmpfs mount where we create and mount a root filesystem for
+	// each child container.
+	mounts = append(mounts, specs.Mount{
+		Type:        tmpfs,
+		Destination: ChildContainersDir,
+	})
+
 	fds := &fdDispenser{fds: goferFDs}
 	rootInode, err := createRootMount(rootCtx, spec, conf, fds, mounts)
 	if err != nil {
diff --git a/runsc/boot/loader.go b/runsc/boot/loader.go
index 1e2a12280..9fa9b51a0 100644
--- a/runsc/boot/loader.go
+++ b/runsc/boot/loader.go
@@ -579,8 +579,6 @@ func (l *Loader) executeAsync(args *control.ExecArgs) (kernel.ThreadID, error) {
 	return tgid, nil
 }
 
-// TODO: Per-container namespaces must be supported for -pid.
-
 // waitContainer waits for the root process of a container to exit.
 func (l *Loader) waitContainer(cid string, waitStatus *uint32) error {
 	// Don't defer unlock, as doing so would make it impossible for