forward all signals to the container

Signed-off-by: Krasi Georgiev <krasi.root@gmail.com>

cmd/ctr/utils_unix.go

@@ -3,6 +3,7 @@
 package main
 
 import (
+	gocontext "context"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -13,11 +14,10 @@ import (
 	"syscall"
 	"time"
 
-	gocontext "context"
-
 	"github.com/pkg/errors"
 	"github.com/tonistiigi/fifo"
 	"github.com/urfave/cli"
+	"golang.org/x/sys/unix"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/grpclog"
 )
@@ -100,3 +100,41 @@ func getGRPCConnection(context *cli.Context) (*grpc.ClientConn, error) {
 	grpcConn = conn
 	return grpcConn, nil
 }
+
+var signalMap = map[string]syscall.Signal{
+	"ABRT":   unix.SIGABRT,
+	"ALRM":   unix.SIGALRM,
+	"BUS":    unix.SIGBUS,
+	"CHLD":   unix.SIGCHLD,
+	"CLD":    unix.SIGCLD,
+	"CONT":   unix.SIGCONT,
+	"FPE":    unix.SIGFPE,
+	"HUP":    unix.SIGHUP,
+	"ILL":    unix.SIGILL,
+	"INT":    unix.SIGINT,
+	"IO":     unix.SIGIO,
+	"IOT":    unix.SIGIOT,
+	"KILL":   unix.SIGKILL,
+	"PIPE":   unix.SIGPIPE,
+	"POLL":   unix.SIGPOLL,
+	"PROF":   unix.SIGPROF,
+	"PWR":    unix.SIGPWR,
+	"QUIT":   unix.SIGQUIT,
+	"SEGV":   unix.SIGSEGV,
+	"STKFLT": unix.SIGSTKFLT,
+	"STOP":   unix.SIGSTOP,
+	"SYS":    unix.SIGSYS,
+	"TERM":   unix.SIGTERM,
+	"TRAP":   unix.SIGTRAP,
+	"TSTP":   unix.SIGTSTP,
+	"TTIN":   unix.SIGTTIN,
+	"TTOU":   unix.SIGTTOU,
+	"UNUSED": unix.SIGUNUSED,
+	"URG":    unix.SIGURG,
+	"USR1":   unix.SIGUSR1,
+	"USR2":   unix.SIGUSR2,
+	"VTALRM": unix.SIGVTALRM,
+	"WINCH":  unix.SIGWINCH,
+	"XCPU":   unix.SIGXCPU,
+	"XFSZ":   unix.SIGXFSZ,
+}