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