src/lxc/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 #define _GNU_SOURCE
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <errno.h>
  27 #include <libgen.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <sys/param.h>
  33
  34 #include "caps.h"
  35 #include "lxc.h"
  36 #include "log.h"
  37 #include "conf.h"
  38 #include "confile.h"
  39 #include "arguments.h"
  40 #include "config.h"
  41 #include "start.h"
  42 #include "utils.h"
  43
  44 lxc_log_define(lxc_execute_ui, lxc_execute);
  45
  46 static struct lxc_list defines;
  47
  48 static int my_checker(const struct lxc_arguments* args)
  49 {
  50         if (!args->argc) {
  51                 lxc_error(args, "missing command to execute !");
  52                 return -1;
  53         }
  54
  55         return 0;
  56 }
  57
  58 static int my_parser(struct lxc_arguments* args, int c, char* arg)
  59 {
  60         switch (c) {
  61         case 'f': args->rcfile = arg; break;
  62         case 's': return lxc_config_define_add(&defines, arg);
  63         }
  64         return 0;
  65 }
  66
  67 static const struct option my_longopts[] = {
  68         {"rcfile", required_argument, 0, 'f'},
  69         {"define", required_argument, 0, 's'},
  70         LXC_COMMON_OPTIONS
  71 };
  72
  73 static struct lxc_arguments my_args = {
  74         .progname = "lxc-execute",
  75         .help     = "\
  76 --name=NAME -- COMMAND\n\
  77 \n\
  78 lxc-execute creates a container with the identifier NAME\n\
  79 and execs COMMAND into this container.\n\
  80 \n\
  81 Options :\n\
  82   -n, --name=NAME      NAME for name of the container\n\
  83   -f, --rcfile=FILE    Load configuration file FILE\n\
  84   -s, --define KEY=VAL Assign VAL to configuration variable KEY\n",
  85         .options  = my_longopts,
  86         .parser   = my_parser,
  87         .checker  = my_checker,
  88 };
  89
  90 int main(int argc, char *argv[])
  91 {
  92         char *rcfile;
  93         struct lxc_conf *conf;
  94
  95         lxc_list_init(&defines);
  96
  97         if (lxc_caps_init())
  98                 return -1;
  99
 100         if (lxc_arguments_parse(&my_args, argc, argv))
 101                 return -1;
 102
 103         if (lxc_log_init(my_args.name, my_args.log_file, my_args.log_priority,
 104                          my_args.progname, my_args.quiet, my_args.lxcpath[0]))
 105                 return -1;
 106
 107         /* rcfile is specified in the cli option */
 108         if (my_args.rcfile)
 109                 rcfile = (char *)my_args.rcfile;
 110         else {
 111                 int rc;
 112
 113                 rc = asprintf(&rcfile, "%s/%s/config", my_args.lxcpath[0], my_args.name);
 114                 if (rc == -1) {
 115                         SYSERROR("failed to allocate memory");
 116                         return -1;
 117                 }
 118
 119                 /* container configuration does not exist */
 120                 if (access(rcfile, F_OK)) {
 121                         free(rcfile);
 122                         rcfile = NULL;
 123                 }
 124         }
 125
 126         conf = lxc_conf_init();
 127         if (!conf) {
 128                 ERROR("failed to initialize configuration");
 129                 return -1;
 130         }
 131
 132         if (rcfile && lxc_config_read(rcfile, conf)) {
 133                 ERROR("failed to read configuration file");
 134                 return -1;
 135         }
 136
 137         if (lxc_config_define_load(&defines, conf))
 138                 return -1;
 139
 140         return lxc_execute(my_args.name, my_args.argv, my_args.quiet, conf, my_args.lxcpath[0]);
 141 }