Allow libcontainerd to build properly on FreeBSD

This includes some changes where the libcontainer code is simply running the
same stubs that it would have previously been running on Solaris

Signed-off-by: R Tyler Croy <tyler@monkeypox.org>

libcontainerd/client_freebsd.go

@@ -0,0 +1,104 @@
+package libcontainerd
+
+import (
+    "golang.org/x/net/context"
+	containerd "github.com/docker/containerd/api/grpc/types"
+)
+
+type client struct {
+	clientCommon
+
+	// Platform specific properties below here.
+	remote        *remote
+	q             queue
+	exitNotifiers map[string]*exitNotifier
+	liveRestore   bool
+}
+
+// GetServerVersion returns the connected server version information
+func (clnt *client) GetServerVersion(ctx context.Context) (*ServerVersion, error) {
+	resp, err := clnt.remote.apiClient.GetServerVersion(ctx, &containerd.GetServerVersionRequest{})
+	if err != nil {
+		return nil, err
+	}
+
+	sv := &ServerVersion{
+		GetServerVersionResponse: *resp,
+	}
+
+	return sv, nil
+}
+
+func (clnt *client) AddProcess(ctx context.Context, containerID, processFriendlyName string, specp Process, attachStdio StdioCallback) (int, error) {
+	return -1, nil
+}
+
+func (clnt *client) SignalProcess(containerID string, pid string, sig int) error {
+	return nil
+}
+
+func (clnt *client) Resize(containerID, processFriendlyName string, width, height int) error {
+	return nil
+}
+
+func (clnt *client) Pause(containerID string) error {
+	return nil
+}
+
+func (clnt *client) Resume(containerID string) error {
+	return nil
+}
+
+func (clnt *client) Stats(containerID string) (*Stats, error) {
+	return nil, nil
+}
+
+func (clnt *client) getExitNotifier(containerID string) *exitNotifier {
+	clnt.mapMutex.RLock()
+	defer clnt.mapMutex.RUnlock()
+	return clnt.exitNotifiers[containerID]
+}
+
+func (clnt *client) getOrCreateExitNotifier(containerID string) *exitNotifier {
+	clnt.mapMutex.Lock()
+	defer clnt.mapMutex.Unlock()
+	w, ok := clnt.exitNotifiers[containerID]
+	if !ok {
+		w = &exitNotifier{c: make(chan struct{}), client: clnt}
+		clnt.exitNotifiers[containerID] = w
+	}
+	return w
+}
+
+// Restore is the handler for restoring a container
+func (clnt *client) Restore(containerID string, attachStdio StdioCallback, options ...CreateOption) error {
+	return nil
+}
+
+func (clnt *client) GetPidsForContainer(containerID string) ([]int, error) {
+	return nil, nil
+}
+
+// Summary returns a summary of the processes running in a container.
+func (clnt *client) Summary(containerID string) ([]Summary, error) {
+	return nil, nil
+}
+
+// UpdateResources updates resources for a running container.
+func (clnt *client) UpdateResources(containerID string, resources Resources) error {
+	// Updating resource isn't supported on Solaris
+	// but we should return nil for enabling updating container
+	return nil
+}
+
+func (clnt *client) CreateCheckpoint(containerID string, checkpointID string, checkpointDir string, exit bool) error {
+	return nil
+}
+
+func (clnt *client) DeleteCheckpoint(containerID string, checkpointID string, checkpointDir string) error {
+	return nil
+}
+
+func (clnt *client) ListCheckpoints(containerID string, checkpointDir string) (*Checkpoints, error) {
+	return nil, nil
+}

libcontainerd/oom_unix.go

@@ -1,3 +1,5 @@
+// +build solaris,freebsd +build !linux
+
 package libcontainerd
 
 func setOOMScore(pid, score int) error {

libcontainerd/queue_unix.go

@@ -1,4 +1,4 @@
-// +build linux solaris
+// +build linux solaris freebsd
 
 package libcontainerd
 

libcontainerd/remote_unix.go

@@ -1,4 +1,4 @@
-// +build linux solaris
+// +build linux solaris freebsd
 
 package libcontainerd
 

libcontainerd/types_freebsd.go

@@ -0,0 +1,43 @@
+package libcontainerd
+
+import (
+	containerd "github.com/docker/containerd/api/grpc/types"
+	"github.com/opencontainers/runtime-spec/specs-go"
+)
+
+// Process contains information to start a specific application inside the container.
+type Process struct {
+	// Terminal creates an interactive terminal for the container.
+	Terminal bool `json:"terminal"`
+	// User specifies user information for the process.
+	User *specs.User `json:"user"`
+	// Args specifies the binary and arguments for the application to execute.
+	Args []string `json:"args"`
+	// Env populates the process environment for the process.
+	Env []string `json:"env,omitempty"`
+	// Cwd is the current working directory for the process and must be
+	// relative to the container's root.
+	Cwd *string `json:"cwd"`
+	// Capabilities are linux capabilities that are kept for the container.
+	Capabilities []string `json:"capabilities,omitempty"`
+}
+
+// Stats contains a stats properties from containerd.
+type Stats struct{}
+
+// Summary contains a container summary from containerd
+type Summary struct{}
+
+// StateInfo contains description about the new state container has entered.
+type StateInfo struct {
+	CommonStateInfo
+
+	// Platform specific StateInfo
+	OOMKilled bool
+}
+
+// Resources defines updatable container resource values.
+type Resources struct{}
+
+// Checkpoints contains the details of a checkpoint
+type Checkpoints containerd.ListCheckpointResponse

libcontainerd/utils_unix.go

@@ -1,3 +1,5 @@
+// +build solaris,freebsd +build !linux
+
 package libcontainerd
 
 import (