src/lxc/execute.c

   1 /*
   2  * lxc: linux Container library
   3  *
   4  * (C) Copyright IBM Corp. 2007, 2008
   5  *
   6  * Authors:
   7  * Daniel Lezcano <daniel.lezcano at free.fr>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29
  30 #include "conf.h"
  31 #include "log.h"
  32 #include "start.h"
  33 #include "utils.h"
  34
  35 lxc_log_define(lxc_execute, lxc_start);
  36
  37 struct execute_args {
  38         char *const *argv;
  39         int quiet;
  40 };
  41
  42 static int execute_start(struct lxc_handler *handler, void* data)
  43 {
  44         int j, i = 0;
  45         struct execute_args *my_args = data;
  46         char **argv;
  47         int argc = 0, argc_add;
  48         char *initpath;
  49
  50         while (my_args->argv[argc++]);
  51
  52         /* lxc-init -n name -- [argc] NULL -> 5 */
  53         argc_add = 5;
  54         if (my_args->quiet)
  55                 argc_add++;
  56         if (!handler->conf->rootfs.path)
  57                 argc_add += 2;
  58         if (lxc_log_has_valid_level())
  59                 argc_add += 2;
  60
  61         argv = malloc((argc + argc_add) * sizeof(*argv));
  62         if (!argv)
  63                 goto out1;
  64
  65         initpath = choose_init(NULL);
  66         if (!initpath) {
  67                 ERROR("Failed to find an init.lxc or init.lxc.static");
  68                 goto out2;
  69         }
  70         argv[i++] = initpath;
  71
  72         argv[i++] = "-n";
  73         argv[i++] = (char *)handler->name;
  74
  75         if (lxc_log_has_valid_level()) {
  76                 argv[i++] = "-l";
  77                 argv[i++] = (char *)lxc_log_priority_to_string(lxc_log_get_level());
  78         }
  79
  80         if (handler->conf->logfile) {
  81                 argv[i++] = "-o";
  82                 argv[i++] = (char *)handler->conf->logfile;
  83         }
  84
  85         if (my_args->quiet)
  86                 argv[i++] = "--quiet";
  87
  88         if (!handler->conf->rootfs.path) {
  89                 argv[i++] = "-P";
  90                 argv[i++] = (char *)handler->lxcpath;
  91         }
  92
  93         argv[i++] = "--";
  94         for (j = 0; j < argc; j++)
  95                 argv[i++] = my_args->argv[j];
  96         argv[i++] = NULL;
  97
  98         NOTICE("Exec'ing \"%s\"", my_args->argv[0]);
  99
 100         execvp(argv[0], argv);
 101         SYSERROR("Failed to exec %s", argv[0]);
 102         free(initpath);
 103 out2:
 104         free(argv);
 105 out1:
 106         return 1;
 107 }
 108
 109 static int execute_post_start(struct lxc_handler *handler, void* data)
 110 {
 111         struct execute_args *my_args = data;
 112         NOTICE("'%s' started with pid '%d'", my_args->argv[0], handler->pid);
 113         return 0;
 114 }
 115
 116 static struct lxc_operations execute_start_ops = {
 117         .start = execute_start,
 118         .post_start = execute_post_start
 119 };
 120
 121 int lxc_execute(const char *name, char *const argv[], int quiet,
 122                 struct lxc_handler *handler, const char *lxcpath,
 123                 bool backgrounded)
 124 {
 125         struct execute_args args = {.argv = argv, .quiet = quiet};
 126
 127         if (lxc_check_inherited(handler->conf, false, &handler->conf->maincmd_fd, 1))
 128                 return -1;
 129
 130         handler->conf->is_execute = 1;
 131         return __lxc_start(name, handler, &execute_start_ops, &args, lxcpath,
 132                            backgrounded);
 133 }