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 <dlezcano at fr.ibm.com>
   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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
  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
  42 lxc_log_define(lxc_execute, lxc);
  43
  44 static int my_checker(const struct lxc_arguments* args)
  45 {
  46         if (!args->argc) {
  47                 lxc_error(args, "missing command to execute !");
  48                 return -1;
  49         }
  50
  51         return 0;
  52 }
  53
  54 static int my_parser(struct lxc_arguments* args, int c, char* arg)
  55 {
  56         switch (c) {
  57         case 'f': args->rcfile = arg; break;
  58         }
  59         return 0;
  60 }
  61
  62 static const struct option my_longopts[] = {
  63         {"rcfile", required_argument, 0, 'f'},
  64         LXC_COMMON_OPTIONS
  65 };
  66
  67 static struct lxc_arguments my_args = {
  68         .progname = "lxc-execute",
  69         .help     = "\
  70 --name=NAME -- COMMAND\n\
  71 \n\
  72 lxc-execute creates a container with the identifier NAME\n\
  73 and execs COMMAND into this container.\n\
  74 \n\
  75 Options :\n\
  76   -n, --name=NAME   NAME for name of the container\n\
  77   -f, --rcfile=FILE Load configuration file FILE\n",
  78         .options  = my_longopts,
  79         .parser   = my_parser,
  80         .checker  = my_checker,
  81 };
  82
  83 int main(int argc, char *argv[])
  84 {
  85         static char **args;
  86         char *rcfile;
  87         struct lxc_conf *conf;
  88
  89         if (lxc_arguments_parse(&my_args, argc, argv))
  90                 return -1;
  91
  92         if (lxc_log_init(my_args.log_file, my_args.log_priority,
  93                          my_args.progname, my_args.quiet))
  94                 return -1;
  95
  96         args = lxc_arguments_dup(LXCLIBEXECDIR "/lxc-init", &my_args);
  97         if (!args)
  98                 return -1;
  99
 100         /* rcfile is specified in the cli option */
 101         if (my_args.rcfile)
 102                 rcfile = (char *)my_args.rcfile;
 103         else {
 104                 if (!asprintf(&rcfile, LXCPATH "/%s/config", my_args.name)) {
 105                         SYSERROR("failed to allocate memory");
 106                         return -1;
 107                 }
 108
 109                 /* container configuration does not exist */
 110                 if (access(rcfile, F_OK)) {
 111                         free(rcfile);
 112                         rcfile = NULL;
 113                 }
 114         }
 115
 116         conf = lxc_conf_init();
 117         if (!conf) {
 118                 ERROR("failed to initialize configuration");
 119                 return -1;
 120         }
 121
 122         if (rcfile && lxc_config_read(rcfile, conf)) {
 123                 ERROR("failed to read configuration file");
 124                 return -1;
 125         }
 126
 127         return lxc_start(my_args.name, args, conf);
 128 }
 129