commands/parttool.c

   1 /* parttool.c - common dispatcher and parser for partition operations */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2009  Free Software Foundation, Inc.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  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., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <grub/types.h>
  22 #include <grub/misc.h>
  23 #include <grub/mm.h>
  24 #include <grub/err.h>
  25 #include <grub/dl.h>
  26 #include <grub/normal.h>
  27 #include <grub/device.h>
  28 #include <grub/disk.h>
  29 #include <grub/partition.h>
  30 #include <grub/parttool.h>
  31 #include <grub/command.h>
  32
  33 static struct grub_parttool *parts = 0;
  34 static int curhandle = 0;
  35 static grub_dl_t mymod;
  36 static char helpmsg[] =
  37   "perform COMMANDS on partition.\n"
  38   "Use \"parttool PARTITION help\" for the list "
  39   "of available commands";
  40
  41 int
  42 grub_parttool_register(const char *part_name,
  43                        const grub_parttool_function_t func,
  44                        const struct grub_parttool_argdesc *args)
  45 {
  46   struct grub_parttool *cur;
  47   int nargs = 0;
  48
  49   if (! parts)
  50     grub_dl_ref (mymod);
  51
  52   cur = (struct grub_parttool *) grub_malloc (sizeof (struct grub_parttool));
  53   cur->next = parts;
  54   cur->name = grub_strdup (part_name);
  55   cur->handle = curhandle++;
  56   for (nargs = 0; args[nargs].name != 0; nargs++);
  57   cur->nargs = nargs;
  58   cur->args = (struct grub_parttool_argdesc *)
  59     grub_malloc ((nargs + 1) * sizeof (struct grub_parttool_argdesc));
  60   grub_memcpy (cur->args, args,
  61                (nargs + 1) * sizeof (struct grub_parttool_argdesc));
  62
  63   cur->func = func;
  64   parts = cur;
  65   return cur->handle;
  66 }
  67
  68 void
  69 grub_parttool_unregister (int handle)
  70 {
  71   struct grub_parttool *prev = 0, *cur, *t;
  72   for (cur = parts; cur; )
  73     if (cur->handle == handle)
  74       {
  75         grub_free (cur->args);
  76         grub_free (cur->name);
  77         if (prev)
  78           prev->next = cur->next;
  79         else
  80           parts = cur->next;
  81         t = cur;
  82         cur = cur->next;
  83         grub_free (t);
  84       }
  85     else
  86       {
  87         prev = cur;
  88         cur = cur->next;
  89       }
  90   if (! parts)
  91     grub_dl_unref (mymod);
  92 }
  93
  94 static grub_err_t
  95 grub_cmd_parttool (grub_command_t cmd __attribute__ ((unused)),
  96                    int argc, char **args)
  97 {
  98   grub_device_t dev;
  99   struct grub_parttool *cur, *ptool;
 100   int *parsed;
 101   int i, j;
 102   grub_err_t err = GRUB_ERR_NONE;
 103
 104   auto grub_err_t show_help (void);
 105   grub_err_t show_help (void)
 106   {
 107     int found = 0;
 108     for (cur = parts; cur; cur = cur->next)
 109       if (grub_strcmp (dev->disk->partition->partmap->name, cur->name) == 0)
 110         {
 111           struct grub_parttool_argdesc *curarg;
 112           found = 1;
 113           for (curarg = cur->args; curarg->name; curarg++)
 114             {
 115               int spacing = 20;
 116
 117               spacing -= grub_strlen (curarg->name);
 118               grub_printf ("%s", curarg->name);
 119
 120               switch (curarg->type)
 121                 {
 122                 case GRUB_PARTTOOL_ARG_BOOL:
 123                   grub_printf ("+/-");
 124                   spacing -= 3;
 125                   break;
 126
 127                 case GRUB_PARTTOOL_ARG_VAL:
 128                   grub_printf ("=VAL");
 129                   spacing -= 4;
 130                   break;
 131
 132                     case GRUB_PARTTOOL_ARG_END:
 133                       break;
 134                 }
 135               while (spacing-- > 0)
 136                 grub_printf (" ");
 137               grub_printf ("%s\n", curarg->desc);
 138             }
 139         }
 140     if (! found)
 141       grub_printf ("Sorry no parttool is available for %s\n",
 142                    dev->disk->partition->partmap->name);
 143     return GRUB_ERR_NONE;
 144   }
 145
 146   if (argc < 1)
 147     {
 148       grub_printf ("%s\n", helpmsg);
 149       return grub_error (GRUB_ERR_BAD_ARGUMENT, "too few arguments");
 150     }
 151
 152   if (args[0][0] == '(' && args[0][grub_strlen (args[0]) - 1] == ')')
 153     {
 154       args[0][grub_strlen (args[0]) - 1] = 0;
 155       dev = grub_device_open (args[0] + 1);
 156       args[0][grub_strlen (args[0]) - 1] = ')';
 157     }
 158   else
 159     dev = grub_device_open (args[0]);
 160
 161   if (! dev)
 162     return grub_errno;
 163
 164   if (! dev->disk)
 165     {
 166       grub_device_close (dev);
 167       return grub_error (GRUB_ERR_BAD_ARGUMENT, "not a disk");
 168     }
 169
 170   if (! dev->disk->partition)
 171     {
 172       grub_device_close (dev);
 173       return grub_error (GRUB_ERR_BAD_ARGUMENT, "not a partition");
 174     }
 175
 176   /* Load modules. */
 177 #ifndef GRUB_UTIL
 178   {
 179     const char *prefix;
 180     prefix = grub_env_get ("prefix");
 181     if (prefix)
 182       {
 183         char *filename;
 184
 185         filename = grub_malloc (grub_strlen (prefix) + sizeof ("/parttool.lst"));
 186         if (filename)
 187           {
 188             grub_file_t file;
 189
 190             grub_sprintf (filename, "%s/parttool.lst", prefix);
 191             file = grub_file_open (filename);
 192             if (file)
 193               {
 194                 char *buf = 0;
 195                 for (;; grub_free(buf))
 196                   {
 197                     char *p, *name;
 198
 199                     buf = grub_file_getline (file);
 200
 201                     if (! buf)
 202                       break;
 203
 204                     name = buf;
 205
 206                     if (! grub_isgraph (name[0]))
 207                       continue;
 208
 209                     p = grub_strchr (name, ':');
 210                     if (! p)
 211                       continue;
 212
 213                     *p = '\0';
 214                     while (*++p == ' ')
 215                       ;
 216
 217                     if (! grub_isgraph (*p))
 218                       continue;
 219
 220                     if (grub_strcmp (name, dev->disk->partition->partmap->name)
 221                         != 0)
 222                       continue;
 223
 224                     grub_dl_load (p);
 225                   }
 226
 227                 grub_file_close (file);
 228               }
 229
 230             grub_free (filename);
 231           }
 232       }
 233     /* Ignore errors.  */
 234     grub_errno = GRUB_ERR_NONE;
 235   }
 236 #endif
 237
 238   if (argc == 1)
 239     return show_help ();
 240
 241   for (i = 1; i < argc; i++)
 242     if (grub_strcmp (args[i], "help") == 0)
 243       return show_help ();
 244
 245   parsed = (int *) grub_zalloc (argc * sizeof (int));
 246
 247   for (i = 1; i < argc; i++)
 248     if (! parsed[i])
 249       {
 250         struct grub_parttool_argdesc *curarg;
 251         struct grub_parttool_args *pargs;
 252         for (cur = parts; cur; cur = cur->next)
 253           if (grub_strcmp (dev->disk->partition->partmap->name, cur->name) == 0)
 254             {
 255               for (curarg = cur->args; curarg->name; curarg++)
 256                 if (grub_strncmp (curarg->name, args[i],
 257                                   grub_strlen (curarg->name)) == 0
 258                     && ((curarg->type == GRUB_PARTTOOL_ARG_BOOL
 259                          && (args[i][grub_strlen (curarg->name)] == '+'
 260                              || args[i][grub_strlen (curarg->name)] == '-'
 261                              || args[i][grub_strlen (curarg->name)] == 0))
 262                         || (curarg->type == GRUB_PARTTOOL_ARG_VAL
 263                             && args[i][grub_strlen (curarg->name)] == '=')))
 264
 265                   break;
 266               if (curarg->name)
 267                 break;
 268             }
 269         if (! cur)
 270           return grub_error (GRUB_ERR_BAD_ARGUMENT, "unrecognised argument %s",
 271                              args[i]);
 272         ptool = cur;
 273         pargs = (struct grub_parttool_args *)
 274           grub_zalloc (ptool->nargs * sizeof (struct grub_parttool_args));
 275         for (j = i; j < argc; j++)
 276           if (! parsed[j])
 277             {
 278               for (curarg = ptool->args; curarg->name; curarg++)
 279                 if (grub_strncmp (curarg->name, args[i],
 280                                    grub_strlen (curarg->name)) == 0
 281                     && ((curarg->type == GRUB_PARTTOOL_ARG_BOOL
 282                          && (args[j][grub_strlen (curarg->name)] == '+'
 283                              || args[j][grub_strlen (curarg->name)] == '-'
 284                              || args[j][grub_strlen (curarg->name)] == 0))
 285                         || (curarg->type == GRUB_PARTTOOL_ARG_VAL
 286                             && args[j][grub_strlen (curarg->name)] == '=')))
 287                   {
 288                     parsed[j] = 1;
 289                     pargs[curarg - ptool->args].set = 1;
 290                     switch (curarg->type)
 291                       {
 292                       case GRUB_PARTTOOL_ARG_BOOL:
 293                         pargs[curarg - ptool->args].bool
 294                           = (args[j][grub_strlen (curarg->name)] != '-');
 295                         break;
 296
 297                       case GRUB_PARTTOOL_ARG_VAL:
 298                         pargs[curarg - ptool->args].str
 299                           = (args[j] + grub_strlen (curarg->name) + 1);
 300                         break;
 301
 302                       case GRUB_PARTTOOL_ARG_END:
 303                         break;
 304                       }
 305                   }
 306             }
 307
 308         err = ptool->func (dev, pargs);
 309         grub_free (pargs);
 310         if (err)
 311           break;
 312       }
 313
 314   grub_free (parsed);
 315   grub_device_close (dev);
 316   return err;
 317 }
 318
 319 static grub_command_t cmd;
 320
 321 GRUB_MOD_INIT(parttool)
 322 {
 323   mymod = mod;
 324   cmd = grub_register_command ("parttool", grub_cmd_parttool,
 325                                "parttool PARTITION COMMANDS",
 326                                helpmsg);
 327 }
 328
 329 GRUB_MOD_FINI(parttool)
 330 {
 331   grub_unregister_command (cmd);
 332 }