X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=src%2Fvnamespace.c;fp=src%2Fvnamespace.c;h=459cd0f14cc56a7636173f1ba5717fb1400fe557;hb=8cf13bb177d92c93eb73dc8939777150536c2d00;hp=0000000000000000000000000000000000000000;hpb=6bf3f95de36c804c97716b2d0bdf10680c559044;p=util-vserver.git

diff --git a/src/vnamespace.c b/src/vnamespace.c
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--- /dev/null
+++ b/src/vnamespace.c
@@ -0,0 +1,196 @@
+// $Id: vnamespace.c,v 1.5 2004/08/19 14:31:24 ensc Exp $    --*- c -*--
+
+// Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//  
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; version 2 of the License.
+//  
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//  
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "util.h"
+#include <lib_internal/sys_clone.h>
+
+#include <vserver.h>
+
+#include <getopt.h>
+#include <libgen.h>
+#include <errno.h>
+#include <signal.h>
+#include <sched.h>
+
+#define ENSC_WRAPPERS_PREFIX	"vnamespace: "
+#define ENSC_WRAPPERS_UNISTD	1
+#define ENSC_WRAPPERS_VSERVER	1
+#include <wrappers.h>
+
+#define CMD_HELP		0x1000
+#define CMD_VERSION		0x1001
+
+int		wrapper_exit_code  =  255;
+
+struct option const
+CMDLINE_OPTIONS[] = {
+  { "help",       no_argument,       0, CMD_HELP },
+  { "version",    no_argument,       0, CMD_VERSION },
+  { "new",        no_argument,       0, 'n' },
+  { "enter",      required_argument, 0, 'e' },
+  { "set",        no_argument,       0, 's' },
+  { "cleanup",    no_argument,       0, 'c' },
+  {0,0,0,0}
+};
+
+static void
+showHelp(int fd, char const *cmd, int res)
+{
+  WRITE_MSG(fd, "Usage: ");
+  WRITE_STR(fd, cmd);
+  WRITE_MSG(fd,
+	    " <operation> [--] [<program> <args>*]\n"
+	    "\n"
+	    "<operation> can be one of:\n"
+	    "    --new|-n          ...  create new namespace and execute <program> there;\n"
+	    "                           <program> is mandatory in this case\n"
+	    "    --enter|-e <xid>  ...  enter the namespace of context <xid> and execute\n"
+	    "                           <program> there; <program> is mandatory in this\n"
+	    "                           case\n"
+	    "    --set|-s          ...  make current namespace the namespace of the\n"
+	    "                           current context\n"
+	    "    --cleanup|-c      ...  remove all mounts from the namespace of the\n"
+	    "                           current context\n"
+	    "\n"
+	    "Please report bugs to " PACKAGE_BUGREPORT "\n");
+
+  exit(res);
+}
+
+static void
+showVersion()
+{
+  WRITE_MSG(1,
+	    "vnamespace " VERSION " -- manages filesystem-namespace\n"
+	    "This program is part of " PACKAGE_STRING "\n\n"
+	    "Copyright (C) 2004 Enrico Scholz\n"
+	    VERSION_COPYRIGHT_DISCLAIMER);
+  exit(0);
+}
+
+static void
+newNamespace(char const *cmd)
+{
+  pid_t		pid;
+
+  signal(SIGCHLD, SIG_DFL);
+  
+#ifdef NDEBUG    
+  pid = sys_clone(CLONE_NEWNS|CLONE_VFORK|SIGCHLD, 0);
+#else
+  pid = sys_clone(CLONE_NEWNS|SIGCHLD, 0);
+#endif
+
+  switch (pid) {
+    case -1	:
+      perror("vnamespace: clone()");
+      exit(wrapper_exit_code);
+    case 0	:
+      break;
+    default	:
+      exitLikeProcess(pid, cmd, wrapper_exit_code);
+  }
+}
+
+static void
+enterNamespace(xid_t xid)
+{
+  if (vc_enter_namespace(xid)==-1) {
+    perror("vnamespace: vc_enter_namespace()");
+    exit(255);
+  }
+}
+
+static void
+setNamespace()
+{
+  if (vc_set_namespace()==-1) {
+    perror("vnamespace: vc_set_namespace()");
+    exit(255);
+  }
+}
+
+static void
+cleanupNamespace()
+{
+  if (vc_cleanup_namespace()==-1) {
+    perror("vnamespace: vc_cleanup_namespace()");
+    exit(255);
+  }
+}
+
+int main(int argc, char *argv[])
+{
+  bool		do_new     = false;
+  bool		do_enter   = false;
+  bool		do_set     = false;
+  bool		do_cleanup = false;
+  xid_t		xid        = VC_NOCTX;
+  int		sum        = 0;
+  
+  while (1) {
+    int		c = getopt_long(argc, argv, "+nsce:", CMDLINE_OPTIONS, 0);
+    if (c==-1) break;
+
+    switch (c) {
+      case CMD_HELP	:  showHelp(1, argv[0], 0);
+      case CMD_VERSION	:  showVersion();
+      case 'n'		:  do_new     = true; break;
+      case 's'		:  do_set     = true; break;
+      case 'c'		:  do_cleanup = true; break;
+      case 'e'		:
+	do_enter = true;
+	xid      = Evc_xidopt2xid(optarg,true);
+	break;
+
+      default		:
+	WRITE_MSG(2, "Try '");
+	WRITE_STR(2, argv[0]);
+	WRITE_MSG(2, " --help\" for more information.\n");
+	return 255;
+	break;
+    }
+  }
+
+  sum = ((do_new ? 1 : 0) + (do_enter ? 1 : 0) +
+	 (do_set ? 1 : 0) + (do_cleanup ? 1 : 0));
+  
+  if (sum==0)
+    WRITE_MSG(2, "No operation was specified; try '--help' for more information\n");
+  else if (sum>1)
+    WRITE_MSG(2, "Can not specify multiple operations; try '--help' for more information\n");
+  else if (optind==argc && (do_new || do_enter))
+    WRITE_MSG(2, "No command specified; try '--help' for more information\n");
+  else {
+    if      (do_new)     newNamespace(argv[optind]);
+    else if (do_set)     setNamespace();
+    else if (do_cleanup) cleanupNamespace();
+    else if (do_enter)   enterNamespace(xid);
+
+    if (optind<argc)
+      EexecvpD(argv[optind], argv+optind);
+
+    return EXIT_SUCCESS;
+  }
+
+  return 255;
+}