src/lxc/destroy.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 #define _GNU_SOURCE
  25 #include <stdio.h>
  26 #undef _GNU_SOURCE
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <dirent.h>
  31 #include <unistd.h>
  32 #include <errno.h>
  33 #include <sys/param.h>
  34 #include <sys/inotify.h>
  35 #include <sys/file.h>
  36 #include <netinet/in.h>
  37 #include <net/if.h>
  38
  39 #include <lxc.h>
  40
  41 static int dir_filter(const struct dirent *dirent)
  42 {
  43         if (!strcmp(dirent->d_name, ".") ||
  44             !strcmp(dirent->d_name, ".."))
  45                 return 0;
  46         return 1;
  47 }
  48
  49 static int is_empty_directory(const char *dirname)
  50 {
  51         struct dirent **namelist;
  52         int n;
  53
  54         n = scandir(dirname, &namelist, dir_filter, alphasort);
  55         if (n < 0)
  56                 lxc_log_syserror("failed to scan %s directory", dirname);
  57         return n == 0;
  58 }
  59
  60 static int remove_lxc_directory(const char *dirname)
  61 {
  62         char path[MAXPATHLEN];
  63
  64         sprintf(path, LXCPATH "/%s", dirname);
  65
  66         if (rmdir(path)) {
  67                 lxc_log_syserror("failed to remove %s directory", path);
  68                 return -1;
  69         }
  70
  71         if (is_empty_directory(LXCPATH)) {
  72                 if (rmdir(LXCPATH)) {
  73                         lxc_log_syserror("failed to remove %s directory", LXCPATH);
  74                         return -1;
  75                 }
  76         }
  77
  78         return 0;
  79 }
  80
  81 int lxc_destroy(const char *name)
  82 {
  83         int ret = -1, lock;
  84
  85         lock = lxc_get_lock(name);
  86         if (!lock) {
  87                 lxc_log_error("'%s' is busy", name);
  88                 goto out;
  89         }
  90
  91         if (lock < 0) {
  92                 lxc_log_error("failed to acquire the lock for '%s':%s",
  93                               name, strerror(-lock));
  94                 goto out;
  95         }
  96
  97         if (lxc_rmstate(name)) {
  98                 lxc_log_error("failed to remove state file for %s", name);
  99                 goto out_lock;
 100         }
 101
 102         lxc_monitor_cleanup(name);
 103
 104         if (lxc_unconfigure(name)) {
 105                 lxc_log_error("failed to cleanup %s", name);
 106                 goto out_lock;
 107         }
 108
 109         if (remove_lxc_directory(name)) {
 110                 lxc_log_syserror("failed to remove '%s'", name);
 111                 goto out_lock;
 112         }
 113
 114         ret = 0;
 115
 116 out_lock:
 117         lxc_put_lock(lock);
 118 out:
 119         return ret;
 120 }