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
36 #define ENSC_WRAPPERS_VSERVER 1
40 # define CLONE_NEWNS 0x00020000
43 #define CMD_HELP 0x1000
44 #define CMD_VERSION 0x1001
46 int wrapper_exit_code = 255;
50 { "help", no_argument, 0, CMD_HELP },
51 { "version", no_argument, 0, CMD_VERSION },
52 { "new", no_argument, 0, 'n' },
53 { "enter", required_argument, 0, 'e' },
54 { "set", no_argument, 0, 's' },
55 { "cleanup", no_argument, 0, 'c' },
60 showHelp(int fd, char const *cmd, int res)
62 WRITE_MSG(fd, "Usage: ");
65 " <operation> [--] [<program> <args>*]\n"
67 "<operation> can be one of:\n"
68 " --new|-n ... create new namespace and execute <program> there;\n"
69 " <program> is mandatory in this case\n"
70 " --enter|-e <xid> ... enter the namespace of context <xid> and execute\n"
71 " <program> there; <program> is mandatory in this\n"
73 " --set|-s ... make current namespace the namespace of the\n"
75 " --cleanup|-c ... remove all mounts from the namespace of the\n"
78 "Please report bugs to " PACKAGE_BUGREPORT "\n");
87 "vnamespace " VERSION " -- manages filesystem-namespace\n"
88 "This program is part of " PACKAGE_STRING "\n\n"
89 "Copyright (C) 2004 Enrico Scholz\n"
90 VERSION_COPYRIGHT_DISCLAIMER);
95 newNamespace(char const *cmd)
99 signal(SIGCHLD, SIG_DFL);
102 pid = sys_clone(CLONE_NEWNS|CLONE_VFORK|SIGCHLD, 0);
104 pid = sys_clone(CLONE_NEWNS|SIGCHLD, 0);
109 perror("vnamespace: clone()");
110 exit(wrapper_exit_code);
114 exitLikeProcess(pid, cmd, wrapper_exit_code);
119 enterNamespace(xid_t xid)
121 if (vc_enter_namespace(xid)==-1) {
122 perror("vnamespace: vc_enter_namespace()");
130 if (vc_set_namespace()==-1) {
131 perror("vnamespace: vc_set_namespace()");
139 if (vc_cleanup_namespace()==-1) {
140 perror("vnamespace: vc_cleanup_namespace()");
145 int main(int argc, char *argv[])
148 bool do_enter = false;
150 bool do_cleanup = false;
151 xid_t xid = VC_NOCTX;
155 int c = getopt_long(argc, argv, "+nsce:", CMDLINE_OPTIONS, 0);
159 case CMD_HELP : showHelp(1, argv[0], 0);
160 case CMD_VERSION : showVersion();
161 case 'n' : do_new = true; break;
162 case 's' : do_set = true; break;
163 case 'c' : do_cleanup = true; break;
166 xid = Evc_xidopt2xid(optarg,true);
170 WRITE_MSG(2, "Try '");
171 WRITE_STR(2, argv[0]);
172 WRITE_MSG(2, " --help\" for more information.\n");
178 sum = ((do_new ? 1 : 0) + (do_enter ? 1 : 0) +
179 (do_set ? 1 : 0) + (do_cleanup ? 1 : 0));
182 WRITE_MSG(2, "No operation was specified; try '--help' for more information\n");
184 WRITE_MSG(2, "Can not specify multiple operations; try '--help' for more information\n");
185 else if (optind==argc && (do_new || do_enter))
186 WRITE_MSG(2, "No command specified; try '--help' for more information\n");
188 if (do_new) newNamespace(argv[optind]);
189 else if (do_set) setNamespace();
190 else if (do_cleanup) cleanupNamespace();
191 else if (do_enter) enterNamespace(xid);
194 EexecvpD(argv[optind], argv+optind);