src/liblxc/create.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
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <dirent.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29 #include <sys/param.h>
  30 #include <sys/inotify.h>
  31 #include <sys/file.h>
  32 #include <sys/stat.h>
  33 #include <sys/types.h>
  34 #include <netinet/in.h>
  35 #include <net/if.h>
  36
  37 #include <lxc.h>
  38 #include <state.h>
  39 #include <list.h>
  40 #include <conf.h>
  41 #include <lock.h>
  42 #include <log.h>
  43
  44 static int dir_filter(const struct dirent *dirent)
  45 {
  46         if (!strcmp(dirent->d_name, ".") ||
  47             !strcmp(dirent->d_name, ".."))
  48                 return 0;
  49         return 1;
  50 }
  51
  52 static int is_empty_directory(const char *dirname)
  53 {
  54         struct dirent **namelist;
  55         int n;
  56
  57         n = scandir(dirname, &namelist, dir_filter, alphasort);
  58         if (n < 0)
  59                 lxc_log_syserror("failed to scan %s directory", dirname);
  60         return n == 0;
  61 }
  62
  63 static int create_lxc_directory(const char *dirname)
  64 {
  65         char path[MAXPATHLEN];
  66
  67         if (mkdir(LXCPATH, 0755) && errno != EEXIST) {
  68                 lxc_log_syserror("failed to created %s directory", LXCPATH);
  69                 return -1;
  70         }
  71
  72         sprintf(path, LXCPATH "/%s", dirname);
  73
  74         if (mkdir(path, 0755)) {
  75                 lxc_log_syserror("failed to created %s directory", path);
  76                 return -1;
  77         }
  78
  79         return 0;
  80 }
  81
  82 static int remove_lxc_directory(const char *dirname)
  83 {
  84         char path[MAXPATHLEN];
  85
  86         sprintf(path, LXCPATH "/%s", dirname);
  87
  88         if (rmdir(path)) {
  89                 lxc_log_syserror("failed to remove %s directory", path);
  90                 return -1;
  91         }
  92
  93         if (is_empty_directory(LXCPATH)) {
  94                 if (rmdir(LXCPATH)) {
  95                         lxc_log_syserror("failed to remove %s directory", LXCPATH);
  96                         return -1;
  97                 }
  98         }
  99
 100         return 0;
 101 }
 102
 103 int lxc_create(const char *name, struct lxc_conf *conf)
 104 {
 105         int lock, err = -1;
 106
 107         if (create_lxc_directory(name)) {
 108                 lxc_log_error("failed to create %s directory", name);
 109                 return -1;
 110         }
 111
 112         lock = lxc_get_lock(name);
 113         if (!lock) {
 114                 lxc_log_error("'%s' is busy", name);
 115                 goto err;
 116         }
 117
 118         if (lock < 0) {
 119                 lxc_log_error("failed to acquire lock on '%s':%s",
 120                               name, strerror(-lock));
 121                 goto err;
 122         }
 123
 124         if (mkstate(name)) {
 125                 lxc_log_error("failed to create the state file for %s", name);
 126                 goto err;
 127         }
 128
 129         if (lxc_setstate(name, STOPPED)) {
 130                 lxc_log_error("failed to set state for %s", name);
 131                 goto err_state;
 132         }
 133
 134         if (lxc_configure(name, conf)) {
 135                 lxc_log_error("failed to set configuration for %s", name);
 136                 goto err_state;
 137         }
 138
 139         err = 0;
 140 out:
 141         lxc_put_lock(lock);
 142         return err;
 143
 144 err_state:
 145         lxc_unconfigure(name);
 146
 147         if (rmstate(name))
 148                 lxc_log_error("failed to remove state file for %s", name);
 149 err:
 150         if (remove_lxc_directory(name))
 151                 lxc_log_error("failed to cleanup lxc directory for %s", name);
 152         goto out;
 153 }