src/lxc/tools/lxc_config.c

   1 /* lxc_config
   2  *
   3  * Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>.
   4  * Copyright © 2012 Canonical Ltd.
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Lesser General Public
   8  *  License as published by the Free Software Foundation; either
   9  *  version 2.1 of the License, or (at your option) any later version.
  10
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Lesser General Public License for more details.
  15
  16  *  You should have received a copy of the GNU Lesser General Public
  17  *  License along with this library; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #ifndef _GNU_SOURCE
  22 #define _GNU_SOURCE 1
  23 #endif
  24 #include <stdio.h>
  25 #include <string.h>
  26
  27 #include <lxc/lxccontainer.h>
  28
  29 #include "config.h"
  30
  31 struct lxc_config_items {
  32         char *name;
  33 };
  34
  35 static struct lxc_config_items items[] =
  36 {
  37         { .name = "lxc.default_config", },
  38         { .name = "lxc.lxcpath", },
  39         { .name = "lxc.bdev.lvm.vg", },
  40         { .name = "lxc.bdev.lvm.thin_pool", },
  41         { .name = "lxc.bdev.zfs.root", },
  42         { .name = "lxc.cgroup.use", },
  43         { .name = "lxc.cgroup.pattern", },
  44         { .name = NULL, },
  45 };
  46
  47 static void usage(char *me)
  48 {
  49         printf("Usage: %s -l: list all available configuration items\n", me);
  50         printf("       %s item: print configuration item\n", me);
  51         exit(EXIT_SUCCESS);
  52 }
  53
  54 static void list_config_items(void)
  55 {
  56         struct lxc_config_items *i;
  57
  58         for (i = &items[0]; i->name; i++)
  59                 printf("%s\n", i->name);
  60
  61         exit(EXIT_SUCCESS);
  62 }
  63
  64 int main(int argc, char *argv[])
  65 {
  66         struct lxc_config_items *i;
  67         const char *value;
  68
  69         if (argc < 2 || strncmp(argv[1], "-h", strlen(argv[1])) == 0 ||
  70                         strncmp(argv[1], "--help", strlen(argv[1])) == 0)
  71                 usage(argv[0]);
  72
  73         if (strncmp(argv[1], "-l", strlen(argv[1])) == 0)
  74                 list_config_items();
  75
  76         for (i = &items[0]; i->name; i++) {
  77                 if (strncmp(argv[1], i->name, strlen(argv[1])) == 0) {
  78                         value = lxc_get_global_config_item(i->name);
  79                         if (value)
  80                                 printf("%s\n", value);
  81                         else
  82                                 printf("%s is not set.\n", argv[1]);
  83
  84                         exit(EXIT_SUCCESS);
  85                 }
  86         }
  87
  88         printf("Unknown configuration item: %s\n", argv[1]);
  89         exit(EXIT_FAILURE);
  90 }