container kill support

Signed-off-by: rajasec <rajasec79@gmail.com>

kill.go

@@ -0,0 +1,53 @@
+// +build linux
+
+package main
+
+import (
+	"fmt"
+	"github.com/codegangsta/cli"
+	"strconv"
+	"strings"
+	"syscall"
+)
+
+var killCommand = cli.Command{
+	Name:  "kill",
+	Usage: "kill a container",
+	Action: func(context *cli.Context) {
+		container, err := getContainer(context)
+		if err != nil {
+			fatal(fmt.Errorf("%s", err))
+		}
+		sigStr := context.Args().First()
+		state, err := container.Status()
+		if err != nil {
+			fatal(fmt.Errorf("Container not running %d", state))
+			// return here
+		}
+		var sig uint64
+		sigN, err := strconv.ParseUint(sigStr, 10, 5)
+		if err != nil {
+			//The signal is not a number, treat it as a string (either like
+			//KILL" or like "SIGKILL")
+			syscallSig, ok := SignalMap[strings.TrimPrefix(sigStr, "SIG")]
+			if !ok {
+				fatal(fmt.Errorf("Invalid Signal: %s", sigStr))
+			}
+			sig = uint64(syscallSig)
+			errVal := container.Signal(syscall.Signal(sig))
+			if errVal != nil {
+				fatal(fmt.Errorf("%s", errVal))
+			}
+		} else {
+			sig = sigN
+			errVar := container.Signal(syscall.Signal(sig))
+			if errVar != nil {
+				fatal(fmt.Errorf("%s", errVar))
+			}
+
+		}
+		if sig == 0 {
+			fatal(fmt.Errorf("Invalid signal: %s", sigStr))
+		}
+	},
+}