tools/vgcfgbackup.c

   1 /*
   2  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   3  * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
   4  *
   5  * This file is part of LVM2.
   6  *
   7  * This copyrighted material is made available to anyone wishing to use,
   8  * modify, copy, or redistribute it subject to the terms and conditions
   9  * of the GNU Lesser General Public License v.2.1.
  10  *
  11  * You should have received a copy of the GNU Lesser General Public License
  12  * along with this program; if not, write to the Free Software Foundation,
  13  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  14  */
  15
  16 #include "tools.h"
  17
  18 static char *_expand_filename(const char *template, const char *vg_name,
  19                               char **last_filename)
  20 {
  21         char *filename;
  22
  23         if (security_level())
  24                 return dm_strdup(template);
  25
  26         if (!(filename = dm_malloc(PATH_MAX))) {
  27                 log_error("Failed to allocate filename.");
  28                 return NULL;
  29         }
  30
  31         if (snprintf(filename, PATH_MAX, template, vg_name) < 0) {
  32                 log_error("Error processing filename template %s",
  33                            template);
  34                 dm_free(filename);
  35                 return NULL;
  36         }
  37         if (*last_filename && !strncmp(*last_filename, filename, PATH_MAX)) {
  38                 log_error("VGs must be backed up into different files. "
  39                           "Use %%s in filename for VG name.");
  40                 dm_free(filename);
  41                 return NULL;
  42         }
  43
  44         dm_free(*last_filename);
  45         *last_filename = filename;
  46
  47         return filename;
  48 }
  49
  50 static int vg_backup_single(struct cmd_context *cmd, const char *vg_name,
  51                             struct volume_group *vg,
  52                             void *handle)
  53 {
  54         char **last_filename = (char **)handle;
  55         char *filename;
  56
  57         if (arg_count(cmd, file_ARG)) {
  58                 if (!(filename = _expand_filename(arg_value(cmd, file_ARG),
  59                                                   vg->name, last_filename))) {
  60                         stack;
  61                         return ECMD_FAILED;
  62                 }
  63
  64                 if (!backup_to_file(filename, vg->cmd->cmd_line, vg)) {
  65                         stack;
  66                         return ECMD_FAILED;
  67                 }
  68         } else {
  69                 if (vg_read_error(vg) == FAILED_INCONSISTENT) {
  70                         log_error("No backup taken: specify filename with -f "
  71                                   "to backup an inconsistent VG");
  72                         stack;
  73                         return ECMD_FAILED;
  74                 }
  75
  76                 /* just use the normal backup code */
  77                 backup_enable(cmd, 1);  /* force a backup */
  78                 if (!backup(vg)) {
  79                         stack;
  80                         return ECMD_FAILED;
  81                 }
  82         }
  83
  84         log_print("Volume group \"%s\" successfully backed up.", vg_name);
  85         return ECMD_PROCESSED;
  86 }
  87
  88 int vgcfgbackup(struct cmd_context *cmd, int argc, char **argv)
  89 {
  90         int ret;
  91         char *last_filename = NULL;
  92
  93         init_pvmove(1);
  94
  95         ret = process_each_vg(cmd, argc, argv, READ_ALLOW_INCONSISTENT,
  96                               &last_filename, &vg_backup_single);
  97
  98         dm_free(last_filename);
  99
 100         init_pvmove(0);
 101
 102         return ret;
 103 }