commands/saveenv.c

   1 /*
   2  * Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2
   9  * as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 /**
  22  * @file
  23  * @brief saveenv: Make the environment persistent
  24  */
  25
  26 #include <common.h>
  27 #include <command.h>
  28 #include <errno.h>
  29 #include <fs.h>
  30 #include <fcntl.h>
  31 #include <environment.h>
  32
  33 static int do_saveenv(struct command *cmdtp, int argc, char *argv[])
  34 {
  35         int ret, fd;
  36         char *filename, *dirname;
  37
  38         printf("saving environment\n");
  39         if (argc < 3)
  40                 dirname = "/env";
  41         else
  42                 dirname = argv[2];
  43         if (argc < 2)
  44                 filename = "/dev/env0";
  45         else
  46                 filename = argv[1];
  47
  48         fd = open(filename, O_WRONLY | O_CREAT);
  49         if (fd < 0) {
  50                 printf("could not open %s: %s\n", filename, errno_str());
  51                 return 1;
  52         }
  53
  54         ret = protect(fd, ~0, 0, 0);
  55
  56         /* ENOSYS is no error here, many devices do not need it */
  57         if (ret && errno != -ENOSYS) {
  58                 printf("could not unprotect %s: %s\n", filename, errno_str());
  59                 close(fd);
  60                 return 1;
  61         }
  62
  63         ret = erase(fd, ~0, 0);
  64
  65         /* ENOSYS is no error here, many devices do not need it */
  66         if (ret && errno != -ENOSYS) {
  67                 printf("could not erase %s: %s\n", filename, errno_str());
  68                 close(fd);
  69                 return 1;
  70         }
  71
  72         close(fd);
  73
  74         ret = envfs_save(filename, dirname);
  75         if (ret) {
  76                 printf("saveenv failed\n");
  77                 goto out;
  78         }
  79
  80         fd = open(filename, O_WRONLY | O_CREAT);
  81
  82         ret = protect(fd, ~0, 0, 1);
  83
  84         /* ENOSYS is no error here, many devices do not need it */
  85         if (ret && errno != -ENOSYS) {
  86                 printf("could not protect %s: %s\n", filename, errno_str());
  87                 close(fd);
  88                 return 1;
  89         }
  90
  91         ret = 0;
  92 out:
  93         close(fd);
  94         return ret;
  95 }
  96
  97 static const __maybe_unused char cmd_saveenv_help[] =
  98 "Usage: saveenv [<envfs>] [<directory>]\n"
  99 "Save the files in <directory> to the persistent storage device <envfs>.\n"
 100 "<envfs> is normally a block in flash, but could be any other file.\n"
 101 "If ommitted <directory> defaults to /env and <envfs> defaults to /dev/env0.\n"
 102 "Note that envfs can only handle files. Directories are skipped silently.\n";
 103
 104 BAREBOX_CMD_START(saveenv)
 105         .cmd            = do_saveenv,
 106         .usage          = "save environment to persistent storage",
 107         BAREBOX_CMD_HELP(cmd_saveenv_help)
 108 BAREBOX_CMD_END
 109
 110 /**
 111  * @page saveenv_command saveenv
 112  *
 113  * Usage: saveenv [\<envfs>] [\<directory>]
 114  *
 115  * Save the files in \<directory> to the persistent storage device \<envfs>.
 116  * \<envfs> is normally a block in flash, but could be any other file.
 117  *
 118  * If ommitted \<directory> defaults to \c /env and \<envfs> defaults to
 119  * \c /dev/env0.
 120  *
 121  * @note envfs can only handle files. Directories are skipped silently.
 122  */