3 // Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
5 // This program is free software; you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation; version 2 of the License.
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License
15 // along with this program; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 #include "sys_clone.h"
34 #define ENSC_WRAPPERS_PREFIX "vnamespace: "
35 #define ENSC_WRAPPERS_UNISTD 1
39 # define CLONE_NEWNS 0x00020000
42 #define CMD_HELP 0x1000
43 #define CMD_VERSION 0x1001
45 int wrapper_exit_code = 255;
49 { "help", no_argument, 0, CMD_HELP },
50 { "version", no_argument, 0, CMD_VERSION },
51 { "new", no_argument, 0, 'n' },
52 { "enter", required_argument, 0, 'e' },
53 { "set", no_argument, 0, 's' },
54 { "cleanup", no_argument, 0, 'c' },
59 showHelp(int fd, char const *cmd, int res)
61 WRITE_MSG(fd, "Usage: ");
64 " <operation> [--] [<program> <args>*]\n"
66 "<operation> can be one of:\n"
67 " --new|-n ... create new namespace and execute <program> there;\n"
68 " <program> is mandatory in this case\n"
69 " --enter|-e <xid> ... enter the namespace of context <xid> and execute\n"
70 " <program> there; <program> is mandatory in this\n"
72 " --set|-s ... make current namespace the namespace of the\n"
74 " --cleanup|-c ... remove all mounts from the namespace of the\n"
77 "Please report bugs to " PACKAGE_BUGREPORT "\n");
86 "vnamespace " VERSION " -- manages filesystem-namespace\n"
87 "This program is part of " PACKAGE_STRING "\n\n"
88 "Copyright (C) 2004 Enrico Scholz\n"
89 VERSION_COPYRIGHT_DISCLAIMER);
98 pid = sys_clone(CLONE_NEWNS|CLONE_VFORK|SIGCHLD, 0);
100 pid = sys_clone(CLONE_NEWNS|SIGCHLD, 0);
105 perror("vnamespace: clone()");
106 exit(wrapper_exit_code);
110 exitLikeProcess(pid);
115 enterNamespace(xid_t xid)
117 if (vc_enter_namespace(xid)==-1) {
118 perror("vnamespace: vc_enter_namespace()");
126 if (vc_set_namespace()==-1) {
127 perror("vnamespace: vc_set_namespace()");
135 if (vc_cleanup_namespace()==-1) {
136 perror("vnamespace: vc_cleanup_namespace()");
141 int main(int argc, char *argv[])
144 bool do_enter = false;
146 bool do_cleanup = false;
147 xid_t xid = VC_NOCTX;
151 int c = getopt_long(argc, argv, "+nsce:", CMDLINE_OPTIONS, 0);
155 case CMD_HELP : showHelp(1, argv[0], 0);
156 case CMD_VERSION : showVersion();
157 case 'n' : do_new = true; break;
158 case 's' : do_set = true; break;
159 case 'c' : do_cleanup = true; break;
160 case 'e' : do_enter = true; xid = atol(optarg); break;
163 WRITE_MSG(2, "Try '");
164 WRITE_STR(2, argv[0]);
165 WRITE_MSG(2, " --help\" for more information.\n");
171 sum = ((do_new ? 1 : 0) + (do_enter ? 1 : 0) +
172 (do_set ? 1 : 0) + (do_cleanup ? 1 : 0));
175 WRITE_MSG(2, "No operation was specified; try '--help' for more information\n");
177 WRITE_MSG(2, "Can not specify multiple operations; try '--help' for more information\n");
178 else if (optind==argc && (do_new || do_enter))
179 WRITE_MSG(2, "No command specified; try '--help' for more information\n");
181 if (do_new) newNamespace();
182 else if (do_set) setNamespace();
183 else if (do_cleanup) cleanupNamespace();
184 else if (do_enter) enterNamespace(xid);
187 EexecvpD(argv[optind], argv+optind);