Add shim for reattach of processes

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Remove runtime files from containerd

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Update supervisor for orphaned containers

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Remove ctr/container.go back to rpc calls

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Add attach to loaded container

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Add monitor based on epoll for process exits

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Convert pids in containerd to string

This is so that we no longer care about linux or system level pids and
processes in containerd have user defined process id(pid) kinda like the
exec process ids that docker has today.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Add reaper back to containerd

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Implement list containers with new process model

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Implement restore of processes

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Add NONBLOCK to exit fifo open

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Implement tty reattach

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Fix race in exit pipe creation

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Add delete to shim

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Update shim to use pid-file and not stdout

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

runtime/container.go

@@ -10,9 +10,27 @@ import (
 
 type Process interface {
 	io.Closer
-	Pid() (int, error)
+
+	// ID of the process.
+	// This is either "init" when it is the container's init process or
+	// it is a user provided id for the process similar to the container id
+	ID() string
+	// Stdin returns the path the the processes stdin fifo
+	Stdin() string
+	// Stdout returns the path the the processes stdout fifo
+	Stdout() string
+	// Stderr returns the path the the processes stderr fifo
+	Stderr() string
+	// ExitFD returns the fd the provides an event when the process exits
+	ExitFD() int
+	// ExitStatus returns the exit status of the process or an error if it
+	// has not exited
+	ExitStatus() (int, error)
 	Spec() specs.Process
+	// Signal sends the provided signal to the process
 	Signal(os.Signal) error
+	// Container returns the container that the process belongs to
+	Container() Container
 }
 
 type State string
@@ -77,20 +95,16 @@ type Checkpoint struct {
 type Container interface {
 	// ID returns the container ID
 	ID() string
-	// Start starts the init process of the container
-	Start() error
 	// Path returns the path to the bundle
 	Path() string
-	// Pid returns the container's init process id
-	Pid() (int, error)
-	// SetExited sets the exit status of the container after its init dies
-	SetExited(status int)
-	// Delete deletes the container
+	// Start starts the init process of the container
+	Start() (Process, error)
+	// Delete removes the container's state and any resources
 	Delete() error
+	// Pid returns the container's init process id
+	// Pid() (int, error)
 	// Processes returns all the containers processes that have been added
 	Processes() ([]Process, error)
-	// RemoveProcess removes a specific process for the container because it exited
-	RemoveProcess(pid int) error
 	// State returns the containers runtime state
 	State() State
 	// Resume resumes a paused container
@@ -98,15 +112,15 @@ type Container interface {
 	// Pause pauses a running container
 	Pause() error
 	// Checkpoints returns all the checkpoints for a container
-	Checkpoints() ([]Checkpoint, error)
+	// Checkpoints() ([]Checkpoint, error)
 	// Checkpoint creates a new checkpoint
-	Checkpoint(Checkpoint) error
+	// Checkpoint(Checkpoint) error
 	// DeleteCheckpoint deletes the checkpoint for the provided name
-	DeleteCheckpoint(name string) error
+	// DeleteCheckpoint(name string) error
 	// Restore restores the container to that of the checkpoint provided by name
-	Restore(name string) error
+	// Restore(name string) error
 	// Stats returns realtime container stats and resource information
-	Stats() (*Stat, error)
+	// Stats() (*Stat, error)
 	// OOM signals the channel if the container received an OOM notification
-	OOM() (<-chan struct{}, error)
+	// OOM() (<-chan struct{}, error)
 }