utils: remove utils & migrate code to sys

Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com>

cmd/containerd/main.go

@@ -26,7 +26,6 @@ import (
 	"github.com/docker/containerd/reaper"
 	"github.com/docker/containerd/snapshot"
 	"github.com/docker/containerd/sys"
-	"github.com/docker/containerd/utils"
 	metrics "github.com/docker/go-metrics"
 	"github.com/pkg/errors"
 	"github.com/urfave/cli"
@@ -220,7 +219,7 @@ func serveDebugAPI() error {
 	if path == "" {
 		return errors.New("debug socket path cannot be empty")
 	}
-	l, err := utils.CreateUnixSocket(path)
+	l, err := sys.CreateUnixSocket(path)
 	if err != nil {
 		return err
 	}
@@ -369,7 +368,7 @@ func serveGRPC(server *grpc.Server) error {
 	if path == "" {
 		return errors.New("--socket path cannot be empty")
 	}
-	l, err := utils.CreateUnixSocket(path)
+	l, err := sys.CreateUnixSocket(path)
 	if err != nil {
 		return err
 	}

linux/shim.go

@@ -16,7 +16,7 @@ import (
 	"github.com/docker/containerd/api/services/shim"
 	localShim "github.com/docker/containerd/linux/shim"
 	"github.com/docker/containerd/reaper"
-	"github.com/docker/containerd/utils"
+	"github.com/docker/containerd/sys"
 	"github.com/pkg/errors"
 )
 
@@ -25,7 +25,7 @@ func newShim(path string, remote bool) (shim.ShimClient, error) {
 		return localShim.Client(path), nil
 	}
 	socket := filepath.Join(path, "shim.sock")
-	l, err := utils.CreateUnixSocket(socket)
+	l, err := sys.CreateUnixSocket(socket)
 	if err != nil {
 		return nil, err
 	}

reaper/reaper.go

@@ -6,13 +6,13 @@ import (
 	"os/exec"
 	"sync"
 
-	"github.com/docker/containerd/utils"
+	"github.com/docker/containerd/sys"
 )
 
 // Reap should be called when the process receives an SIGCHLD.  Reap will reap
 // all exited processes and close their wait channels
 func Reap() error {
-	exits, err := utils.Reap(false)
+	exits, err := sys.Reap(false)
 	for _, e := range exits {
 		Default.Lock()
 		c, ok := Default.cmds[e.Pid]

sys/socket.go

@@ -1,4 +1,4 @@
-package utils
+package sys
 
 import (
 	"net"

utils/reaper.go

@@ -1,49 +0,0 @@
-package utils
-
-import "syscall"
-
-// Exit is the wait4 information from an exited process
-type Exit struct {
-	Pid    int
-	Status int
-}
-
-// Reap reaps all child processes for the calling process and returns their
-// exit information
-func Reap(wait bool) (exits []Exit, err error) {
-	var (
-		ws  syscall.WaitStatus
-		rus syscall.Rusage
-	)
-	flag := syscall.WNOHANG
-	if wait {
-		flag = 0
-	}
-	for {
-		pid, err := syscall.Wait4(-1, &ws, flag, &rus)
-		if err != nil {
-			if err == syscall.ECHILD {
-				return exits, nil
-			}
-			return exits, err
-		}
-		if pid <= 0 {
-			return exits, nil
-		}
-		exits = append(exits, Exit{
-			Pid:    pid,
-			Status: ExitStatus(ws),
-		})
-	}
-}
-
-const exitSignalOffset = 128
-
-// ExitStatus returns the correct exit status for a process based on if it
-// was signaled or exited cleanly
-func ExitStatus(status syscall.WaitStatus) int {
-	if status.Signaled() {
-		return exitSignalOffset + int(status.Signal())
-	}
-	return status.ExitStatus()
-}