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