Add bind points for /dev/ and /etc/resolv.conf into the container when exec'ing

internal/app/wwctl/container/exec/child/main.go

@@ -1,13 +1,15 @@
-// +build linux
+// + build linux
 
 package child
 
 import (
 	"fmt"
 	"github.com/hpcng/warewulf/internal/pkg/container"
+	"github.com/hpcng/warewulf/internal/pkg/util"
 	"github.com/hpcng/warewulf/internal/pkg/wwlog"
 	"github.com/spf13/cobra"
 	"os"
+	"path"
 	"syscall"
 )
 
@@ -25,10 +27,15 @@ func CobraRunE(cmd *cobra.Command, args []string) error {
 		os.Exit(1)
 	}
 
-	syscall.Mount("", "/", "", syscall.MS_PRIVATE, "")
-
 	containerPath := container.RootFsDir(containerName)
 
+	syscall.Mount("", "/", "", syscall.MS_PRIVATE, "")
+	syscall.Mount("/dev", path.Join(containerPath, "/dev"), "", syscall.MS_BIND, "")
+
+	if util.IsFile(path.Join(containerPath, "/etc/resolv.conf")) == true {
+		syscall.Mount("/etc/resolv.conf", path.Join(containerPath, "/etc/resolv.conf"), "", syscall.MS_BIND, "")
+	}
+
 	syscall.Chroot(containerPath)
 	os.Chdir("/")