src/vfs/extfs/extfs.c

   1 /*
   2    Virtual File System: External file system.
   3
   4    Copyright (C) 1995-2022
   5    Free Software Foundation, Inc.
   6
   7    Written by:
   8    Jakub Jelinek, 1995
   9    Pavel Machek, 1998
  10    Andrew T. Veliath, 1999
  11    Slava Zanko <slavazanko@gmail.com>, 2013
  12
  13    This file is part of the Midnight Commander.
  14
  15    The Midnight Commander is free software: you can redistribute it
  16    and/or modify it under the terms of the GNU General Public License as
  17    published by the Free Software Foundation, either version 3 of the License,
  18    or (at your option) any later version.
  19
  20    The Midnight Commander is distributed in the hope that it will be useful,
  21    but WITHOUT ANY WARRANTY; without even the implied warranty of
  22    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23    GNU General Public License for more details.
  24
  25    You should have received a copy of the GNU General Public License
  26    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  27  */
  28
  29 /**
  30  * \file
  31  * \brief Source: Virtual File System: External file system
  32  * \author Jakub Jelinek
  33  * \author Pavel Machek
  34  * \author Andrew T. Veliath
  35  * \date 1995, 1998, 1999
  36  */
  37
  38 /* Namespace: init_extfs */
  39
  40 #include <config.h>
  41
  42 #include <stdio.h>
  43 #include <ctype.h>
  44 #include <string.h>
  45 #include <stdlib.h>
  46 #include <sys/types.h>
  47 #include <sys/stat.h>
  48 #include <unistd.h>
  49 #include <signal.h>
  50 #include <errno.h>
  51 #include <sys/wait.h>
  52
  53 #include "lib/global.h"
  54 #include "lib/fileloc.h"
  55 #include "lib/mcconfig.h"
  56 #include "lib/util.h"
  57 #include "lib/widget.h"         /* message() */
  58
  59 #include "src/execute.h"        /* For shell_execute */
  60
  61 #include "lib/vfs/vfs.h"
  62 #include "lib/vfs/utilvfs.h"
  63 #include "lib/vfs/xdirentry.h"
  64 #include "lib/vfs/gc.h"         /* vfs_rmstamp */
  65
  66 #include "extfs.h"
  67
  68 /*** global variables ****************************************************************************/
  69
  70 /*** file scope macro definitions ****************************************************************/
  71
  72 #undef ERRNOR
  73 #define ERRNOR(x,y) do { my_errno = x; return y; } while(0)
  74
  75 #define RECORDSIZE 512
  76
  77 #define EXTFS_SUPER(a) ((struct extfs_super_t *) (a))
  78
  79 /*** file scope type declarations ****************************************************************/
  80
  81 struct extfs_super_t
  82 {
  83     struct vfs_s_super base;    /* base class */
  84
  85     int fstype;
  86     char *local_name;
  87     struct stat local_stat;
  88     dev_t rdev;
  89 };
  90
  91 typedef struct
  92 {
  93     char *path;
  94     char *prefix;
  95     gboolean need_archive;
  96 } extfs_plugin_info_t;
  97
  98 /*** file scope variables ************************************************************************/
  99
 100 static GArray *extfs_plugins = NULL;
 101
 102 static gboolean errloop;
 103 static gboolean notadir;
 104
 105 static struct vfs_s_subclass extfs_subclass;
 106 static struct vfs_class *vfs_extfs_ops = VFS_CLASS (&extfs_subclass);
 107
 108 static int my_errno = 0;
 109
 110 /* --------------------------------------------------------------------------------------------- */
 111 /*** file scope functions ************************************************************************/
 112 /* --------------------------------------------------------------------------------------------- */
 113
 114 static struct vfs_s_entry *extfs_resolve_symlinks_int (struct vfs_s_entry *entry, GSList * list);
 115
 116 /* --------------------------------------------------------------------------------------------- */
 117
 118 static struct extfs_super_t *
 119 extfs_super_new (struct vfs_class *me, const char *name, const vfs_path_t * local_name_vpath,
 120                  int fstype)
 121 {
 122     struct extfs_super_t *super;
 123     struct vfs_s_super *vsuper;
 124
 125     super = g_new0 (struct extfs_super_t, 1);
 126     vsuper = VFS_SUPER (super);
 127
 128     vsuper->me = me;
 129     vsuper->name = g_strdup (name);
 130
 131     super->fstype = fstype;
 132
 133     if (local_name_vpath != NULL)
 134     {
 135         super->local_name = g_strdup (vfs_path_get_last_path_str (local_name_vpath));
 136         mc_stat (local_name_vpath, &super->local_stat);
 137     }
 138
 139     VFS_SUBCLASS (me)->supers = g_list_prepend (VFS_SUBCLASS (me)->supers, super);
 140
 141     return super;
 142 }
 143
 144 /* --------------------------------------------------------------------------------------------- */
 145
 146 /* unlike vfs_s_new_entry(), inode->ent is kept */
 147 static struct vfs_s_entry *
 148 extfs_entry_new (struct vfs_class *me, const char *name, struct vfs_s_inode *inode)
 149 {
 150     struct vfs_s_entry *entry;
 151
 152     (void) me;
 153
 154     entry = g_new0 (struct vfs_s_entry, 1);
 155
 156     entry->name = g_strdup (name);
 157     entry->ino = inode;
 158
 159     return entry;
 160 }
 161
 162 /* --------------------------------------------------------------------------------------------- */
 163
 164 static void
 165 extfs_fill_name (void *data, void *user_data)
 166 {
 167     struct vfs_s_super *a = VFS_SUPER (data);
 168     fill_names_f func = (fill_names_f) user_data;
 169     extfs_plugin_info_t *info;
 170     char *name;
 171
 172     info = &g_array_index (extfs_plugins, extfs_plugin_info_t, EXTFS_SUPER (a)->fstype);
 173     name =
 174         g_strconcat (a->name != NULL ? a->name : "", PATH_SEP_STR, info->prefix,
 175                      VFS_PATH_URL_DELIMITER, (char *) NULL);
 176     func (name);
 177     g_free (name);
 178 }
 179
 180 /* --------------------------------------------------------------------------------------------- */
 181
 182 static gint
 183 extfs_cmp_archive (const void *a, const void *b)
 184 {
 185     const struct vfs_s_super *ar = (const struct vfs_s_super *) a;
 186     const char *archive_name = (const char *) b;
 187
 188     return (ar->name != NULL && strcmp (ar->name, archive_name) == 0) ? 0 : 1;
 189 }
 190
 191 /* --------------------------------------------------------------------------------------------- */
 192
 193 static struct vfs_s_entry *
 194 extfs_generate_entry (struct extfs_super_t *archive, const char *name, struct vfs_s_inode *parent,
 195                       mode_t mode)
 196 {
 197     struct vfs_class *me = VFS_SUPER (archive)->me;
 198     struct stat st;
 199     mode_t myumask;
 200     struct vfs_s_inode *inode;
 201     struct vfs_s_entry *entry;
 202
 203     memset (&st, 0, sizeof (st));
 204     st.st_ino = VFS_SUPER (archive)->ino_usage++;
 205     st.st_dev = archive->rdev;
 206     myumask = umask (022);
 207     umask (myumask);
 208     st.st_mode = mode & ~myumask;
 209     st.st_uid = getuid ();
 210     st.st_gid = getgid ();
 211     st.st_mtime = time (NULL);
 212     st.st_atime = st.st_mtime;
 213     st.st_ctime = st.st_mtime;
 214     st.st_nlink = 1;
 215
 216     inode = vfs_s_new_inode (me, VFS_SUPER (archive), &st);
 217     entry = vfs_s_new_entry (me, name, inode);
 218     if (parent != NULL)
 219         vfs_s_insert_entry (me, parent, entry);
 220
 221     return entry;
 222 }
 223
 224 /* --------------------------------------------------------------------------------------------- */
 225
 226 static struct vfs_s_entry *
 227 extfs_find_entry_int (struct vfs_s_inode *dir, const char *name, GSList * list, int flags)
 228 {
 229     struct vfs_s_entry *pent, *pdir;
 230     const char *p, *name_end;
 231     char *q;
 232     char c = PATH_SEP;
 233     struct extfs_super_t *super;
 234
 235     if (g_path_is_absolute (name))
 236     {
 237         /* Handle absolute paths */
 238         name = g_path_skip_root (name);
 239         dir = dir->super->root;
 240     }
 241
 242     super = EXTFS_SUPER (dir->super);
 243     pent = dir->ent;
 244     p = name;
 245     name_end = name + strlen (name);
 246
 247     while ((pent != NULL) && (c != '\0') && (*p != '\0'))
 248     {
 249         q = strchr (p, PATH_SEP);
 250         if (q == NULL)
 251             q = (char *) name_end;
 252
 253         c = *q;
 254         *q = '\0';
 255
 256         if (DIR_IS_DOTDOT (p))
 257             pent = pent->dir->ent;
 258         else
 259         {
 260             GList *pl;
 261
 262             pent = extfs_resolve_symlinks_int (pent, list);
 263             if (pent == NULL)
 264             {
 265                 *q = c;
 266                 return NULL;
 267             }
 268
 269             if (!S_ISDIR (pent->ino->st.st_mode))
 270             {
 271                 *q = c;
 272                 notadir = TRUE;
 273                 return NULL;
 274             }
 275
 276             pdir = pent;
 277             pl = g_queue_find_custom (pent->ino->subdir, p, vfs_s_entry_compare);
 278             pent = pl != NULL ? VFS_ENTRY (pl->data) : NULL;
 279             if (pent != NULL && q + 1 > name_end)
 280             {
 281                 /* Hack: I keep the original semanthic unless q+1 would break in the strchr */
 282                 *q = c;
 283                 notadir = !S_ISDIR (pent->ino->st.st_mode);
 284                 return pent;
 285             }
 286
 287             /* When we load archive, we create automagically non-existent directories */
 288             if (pent == NULL && (flags & FL_MKDIR) != 0)
 289                 pent = extfs_generate_entry (super, p, pdir->ino, S_IFDIR | 0777);
 290             if (pent == NULL && (flags & FL_MKFILE) != 0)
 291                 pent = extfs_generate_entry (super, p, pdir->ino, S_IFREG | 0666);
 292         }
 293
 294         /* Next iteration */
 295         *q = c;
 296         if (c != '\0')
 297             p = q + 1;
 298     }
 299     if (pent == NULL)
 300         my_errno = ENOENT;
 301     return pent;
 302 }
 303
 304 /* --------------------------------------------------------------------------------------------- */
 305
 306 static struct vfs_s_entry *
 307 extfs_find_entry (struct vfs_s_inode *dir, const char *name, int flags)
 308 {
 309     struct vfs_s_entry *res;
 310
 311     errloop = FALSE;
 312     notadir = FALSE;
 313
 314     res = extfs_find_entry_int (dir, name, NULL, flags);
 315     if (res == NULL)
 316     {
 317         if (errloop)
 318             my_errno = ELOOP;
 319         else if (notadir)
 320             my_errno = ENOTDIR;
 321     }
 322     return res;
 323 }
 324
 325 /* --------------------------------------------------------------------------------------------- */
 326
 327 static void
 328 extfs_fill_names (struct vfs_class *me, fill_names_f func)
 329 {
 330     g_list_foreach (VFS_SUBCLASS (me)->supers, extfs_fill_name, func);
 331 }
 332
 333 /* --------------------------------------------------------------------------------------------- */
 334
 335 /* Create this function because VFSF_USETMP flag is not used in extfs */
 336 static void
 337 extfs_free_inode (struct vfs_class *me, struct vfs_s_inode *ino)
 338 {
 339     (void) me;
 340
 341     if (ino->localname != NULL)
 342     {
 343         unlink (ino->localname);
 344         MC_PTR_FREE (ino->localname);
 345     }
 346 }
 347
 348 /* --------------------------------------------------------------------------------------------- */
 349
 350 static void
 351 extfs_free_archive (struct vfs_class *me, struct vfs_s_super *psup)
 352 {
 353     struct extfs_super_t *archive = EXTFS_SUPER (psup);
 354
 355     (void) me;
 356
 357     if (archive->local_name != NULL)
 358     {
 359         struct stat my;
 360         vfs_path_t *local_name_vpath, *name_vpath;
 361
 362         local_name_vpath = vfs_path_from_str (archive->local_name);
 363         name_vpath = vfs_path_from_str (psup->name);
 364         mc_stat (local_name_vpath, &my);
 365         mc_ungetlocalcopy (name_vpath, local_name_vpath,
 366                            archive->local_stat.st_mtime != my.st_mtime);
 367         vfs_path_free (local_name_vpath, TRUE);
 368         vfs_path_free (name_vpath, TRUE);
 369         g_free (archive->local_name);
 370     }
 371 }
 372
 373 /* --------------------------------------------------------------------------------------------- */
 374
 375 static inline char *
 376 extfs_skip_leading_dotslash (char *s)
 377 {
 378     /* Skip leading "./" (if present).
 379      * Some programs don't understand it:
 380      *
 381      * $ zip file.zip ./-file2.txt file1.txt
 382      *   adding: -file2.txt (stored 0%)
 383      *   adding: file1.txt (stored 0%)
 384      * $ /usr/lib/mc/extfs.d/uzip copyout file.zip ./-file2.txt ./tmp-file2.txt
 385      * caution: filename not matched:  ./-file2.txt
 386      */
 387     if (s[0] == '.' && s[1] == PATH_SEP)
 388         s += 2;
 389
 390     return s;
 391 }
 392
 393 /* --------------------------------------------------------------------------------------------- */
 394
 395 static int
 396 extfs_add_file (struct extfs_super_t *archive, const char *file_name)
 397 {
 398     struct vfs_s_super *super = VFS_SUPER (archive);
 399     struct stat hstat;
 400     char *current_file_name = NULL, *current_link_name = NULL;
 401     int ret = 0;
 402
 403     if (vfs_parse_ls_lga (file_name, &hstat, &current_file_name, &current_link_name, NULL))
 404     {
 405         char *cfn = current_file_name;
 406
 407         if (*cfn != '\0')
 408         {
 409             struct vfs_s_entry *entry;
 410             struct vfs_s_entry *pent = NULL;
 411             struct vfs_s_inode *inode;
 412             char *p, *q;
 413
 414             cfn = extfs_skip_leading_dotslash (cfn);
 415             if (IS_PATH_SEP (*cfn))
 416                 cfn++;
 417             p = strchr (cfn, '\0');
 418             if (p != cfn && IS_PATH_SEP (p[-1]))
 419                 p[-1] = '\0';
 420             p = strrchr (cfn, PATH_SEP);
 421             if (p == NULL)
 422             {
 423                 p = cfn;
 424                 q = strchr (cfn, '\0');
 425             }
 426             else
 427             {
 428                 *(p++) = '\0';
 429                 q = cfn;
 430             }
 431
 432             if (*q != '\0')
 433             {
 434                 pent = extfs_find_entry (super->root, q, FL_MKDIR);
 435                 if (pent == NULL)
 436                 {
 437                     ret = -1;
 438                     goto done;
 439                 }
 440             }
 441
 442             if (pent != NULL)
 443             {
 444                 entry = extfs_entry_new (super->me, p, pent->ino);
 445                 entry->dir = pent->ino;
 446                 g_queue_push_tail (pent->ino->subdir, entry);
 447             }
 448             else
 449             {
 450                 entry = extfs_entry_new (super->me, p, super->root);
 451                 entry->dir = super->root;
 452                 g_queue_push_tail (super->root->subdir, entry);
 453             }
 454
 455             if (!S_ISLNK (hstat.st_mode) && (current_link_name != NULL))
 456             {
 457                 pent = extfs_find_entry (super->root, current_link_name, FL_NONE);
 458                 if (pent == NULL)
 459                 {
 460                     ret = -1;
 461                     goto done;
 462                 }
 463
 464                 pent->ino->st.st_nlink++;
 465                 entry->ino = pent->ino;
 466             }
 467             else
 468             {
 469                 struct stat st;
 470
 471                 memset (&st, 0, sizeof (st));
 472                 st.st_ino = super->ino_usage++;
 473                 st.st_nlink = 1;
 474                 st.st_dev = archive->rdev;
 475                 st.st_mode = hstat.st_mode;
 476 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 477                 st.st_rdev = hstat.st_rdev;
 478 #endif
 479                 st.st_uid = hstat.st_uid;
 480                 st.st_gid = hstat.st_gid;
 481                 st.st_size = hstat.st_size;
 482                 st.st_mtime = hstat.st_mtime;
 483                 st.st_atime = hstat.st_atime;
 484                 st.st_ctime = hstat.st_ctime;
 485
 486                 if (current_link_name == NULL && S_ISLNK (hstat.st_mode))
 487                     st.st_mode &= ~S_IFLNK;     /* You *DON'T* want to do this always */
 488
 489                 inode = vfs_s_new_inode (super->me, super, &st);
 490                 inode->ent = entry;
 491                 entry->ino = inode;
 492
 493                 if (current_link_name != NULL && S_ISLNK (hstat.st_mode))
 494                 {
 495                     inode->linkname = current_link_name;
 496                     current_link_name = NULL;
 497                 }
 498             }
 499         }
 500
 501       done:
 502         g_free (current_file_name);
 503         g_free (current_link_name);
 504     }
 505
 506     return ret;
 507 }
 508
 509 /* --------------------------------------------------------------------------------------------- */
 510
 511 static mc_pipe_t *
 512 extfs_open_archive (int fstype, const char *name, struct extfs_super_t **pparc, GError ** error)
 513 {
 514     const extfs_plugin_info_t *info;
 515     static dev_t archive_counter = 0;
 516     mc_pipe_t *result = NULL;
 517     mode_t mode;
 518     char *cmd;
 519     struct stat mystat;
 520     struct extfs_super_t *current_archive;
 521     struct vfs_s_entry *root_entry;
 522     char *tmp = NULL;
 523     vfs_path_t *local_name_vpath = NULL;
 524     vfs_path_t *name_vpath;
 525
 526     memset (&mystat, 0, sizeof (mystat));
 527
 528     name_vpath = vfs_path_from_str (name);
 529     info = &g_array_index (extfs_plugins, extfs_plugin_info_t, fstype);
 530
 531     if (info->need_archive)
 532     {
 533         if (mc_stat (name_vpath, &mystat) == -1)
 534             goto ret;
 535
 536         if (!vfs_file_is_local (name_vpath))
 537         {
 538             local_name_vpath = mc_getlocalcopy (name_vpath);
 539             if (local_name_vpath == NULL)
 540                 goto ret;
 541         }
 542
 543         tmp = name_quote (vfs_path_get_last_path_str (name_vpath), FALSE);
 544     }
 545
 546     cmd = g_strconcat (info->path, info->prefix, " list ",
 547                        vfs_path_get_last_path_str (local_name_vpath) != NULL ?
 548                        vfs_path_get_last_path_str (local_name_vpath) : tmp, (char *) NULL);
 549     g_free (tmp);
 550
 551     result = mc_popen (cmd, TRUE, TRUE, error);
 552     g_free (cmd);
 553
 554     if (result == NULL)
 555     {
 556         if (local_name_vpath != NULL)
 557         {
 558             mc_ungetlocalcopy (name_vpath, local_name_vpath, FALSE);
 559             vfs_path_free (local_name_vpath, TRUE);
 560         }
 561         goto ret;
 562     }
 563
 564     current_archive = extfs_super_new (vfs_extfs_ops, name, local_name_vpath, fstype);
 565     current_archive->rdev = archive_counter++;
 566     vfs_path_free (local_name_vpath, TRUE);
 567
 568     mode = mystat.st_mode & 07777;
 569     if (mode & 0400)
 570         mode |= 0100;
 571     if (mode & 0040)
 572         mode |= 0010;
 573     if (mode & 0004)
 574         mode |= 0001;
 575     mode |= S_IFDIR;
 576
 577     root_entry = extfs_generate_entry (current_archive, PATH_SEP_STR, NULL, mode);
 578     root_entry->ino->st.st_uid = mystat.st_uid;
 579     root_entry->ino->st.st_gid = mystat.st_gid;
 580     root_entry->ino->st.st_atime = mystat.st_atime;
 581     root_entry->ino->st.st_ctime = mystat.st_ctime;
 582     root_entry->ino->st.st_mtime = mystat.st_mtime;
 583     root_entry->ino->ent = root_entry;
 584     VFS_SUPER (current_archive)->root = root_entry->ino;
 585
 586     *pparc = current_archive;
 587
 588   ret:
 589     vfs_path_free (name_vpath, TRUE);
 590     return result;
 591 }
 592
 593 /* --------------------------------------------------------------------------------------------- */
 594 /**
 595  * Main loop for reading an archive.
 596  * Return 0 on success, -1 on error.
 597  */
 598
 599 static int
 600 extfs_read_archive (mc_pipe_t * pip, struct extfs_super_t *archive, GError ** error)
 601 {
 602     int ret = 0;
 603     GString *buffer;
 604     GString *err_msg = NULL;
 605     GString *remain_file_name = NULL;
 606
 607     while (ret != -1)
 608     {
 609         /* init buffers before call of mc_pread() */
 610         pip->out.len = MC_PIPE_BUFSIZE;
 611         pip->err.len = MC_PIPE_BUFSIZE;
 612
 613         mc_pread (pip, error);
 614
 615         if (*error != NULL)
 616             return (-1);
 617
 618         if (pip->err.len > 0)
 619         {
 620             /* join errors/warnings */
 621             if (err_msg == NULL)
 622                 err_msg = g_string_new_len (pip->err.buf, pip->err.len);
 623             else
 624             {
 625                 if (err_msg->str[err_msg->len - 1] != '\n')
 626                     g_string_append_c (err_msg, '\n');
 627                 g_string_append_len (err_msg, pip->err.buf, pip->err.len);
 628             }
 629         }
 630
 631         if (pip->out.len == MC_PIPE_STREAM_EOF)
 632             break;
 633
 634         if (pip->out.len == 0)
 635             continue;
 636
 637         if (pip->out.len == MC_PIPE_ERROR_READ)
 638             return (-1);
 639
 640         while (ret != -1 && (buffer = mc_pstream_get_string (&pip->out)) != NULL)
 641         {
 642             /* handle a \n-separated file list */
 643
 644             if (buffer->str[buffer->len - 1] == '\n')
 645             {
 646                 /* entire file name or last chunk */
 647
 648                 g_string_truncate (buffer, buffer->len - 1);
 649
 650                 /* join filename chunks */
 651                 if (remain_file_name != NULL)
 652                 {
 653                     g_string_append_len (remain_file_name, buffer->str, buffer->len);
 654                     g_string_free (buffer, TRUE);
 655                     buffer = remain_file_name;
 656                     remain_file_name = NULL;
 657                 }
 658             }
 659             else
 660             {
 661                 /* first or middle chunk of file name */
 662
 663                 if (remain_file_name == NULL)
 664                     remain_file_name = buffer;
 665                 else
 666                 {
 667                     g_string_append_len (remain_file_name, buffer->str, buffer->len);
 668                     g_string_free (buffer, TRUE);
 669                 }
 670
 671                 continue;
 672             }
 673
 674             ret = extfs_add_file (archive, buffer->str);
 675
 676             g_string_free (buffer, TRUE);
 677         }
 678     }
 679
 680     if (remain_file_name != NULL)
 681         g_string_free (remain_file_name, TRUE);
 682
 683     if (err_msg != NULL)
 684     {
 685         if (*error == NULL)
 686             mc_propagate_error (error, 0, "%s", err_msg->str);
 687
 688         g_string_free (err_msg, TRUE);
 689     }
 690
 691     return ret;
 692 }
 693
 694 /* --------------------------------------------------------------------------------------------- */
 695
 696 static int
 697 extfs_which (struct vfs_class *me, const char *path)
 698 {
 699     size_t path_len;
 700     size_t i;
 701
 702     (void) me;
 703
 704     path_len = strlen (path);
 705
 706     for (i = 0; i < extfs_plugins->len; i++)
 707     {
 708         extfs_plugin_info_t *info;
 709
 710         info = &g_array_index (extfs_plugins, extfs_plugin_info_t, i);
 711
 712         if ((strncmp (path, info->prefix, path_len) == 0)
 713             && ((info->prefix[path_len] == '\0') || (info->prefix[path_len] == '+')))
 714             return i;
 715     }
 716     return -1;
 717 }
 718
 719 /* --------------------------------------------------------------------------------------------- */
 720
 721 static int
 722 extfs_open_and_read_archive (int fstype, const char *name, struct extfs_super_t **archive)
 723 {
 724     int result = -1;
 725     struct extfs_super_t *a;
 726     mc_pipe_t *pip;
 727     GError *error = NULL;
 728
 729     pip = extfs_open_archive (fstype, name, archive, &error);
 730
 731     a = *archive;
 732
 733     if (pip == NULL)
 734     {
 735         const extfs_plugin_info_t *info;
 736
 737         info = &g_array_index (extfs_plugins, extfs_plugin_info_t, fstype);
 738         message (D_ERROR, MSG_ERROR, _("Cannot open %s archive\n%s:\n%s"), info->prefix, name,
 739                  error->message);
 740         g_error_free (error);
 741     }
 742     else
 743     {
 744         result = extfs_read_archive (pip, a, &error);
 745
 746         if (result != 0)
 747             VFS_SUPER (a)->me->free (VFS_SUPER (a));
 748
 749         if (error != NULL)
 750         {
 751             message (D_ERROR, MSG_ERROR, _("EXTFS virtual file system:\n%s"), error->message);
 752             g_error_free (error);
 753         }
 754
 755         mc_pclose (pip, NULL);
 756     }
 757
 758     return result;
 759 }
 760
 761 /* --------------------------------------------------------------------------------------------- */
 762 /**
 763  * Dissect the path and create corresponding superblock.
 764  */
 765 static const char *
 766 extfs_get_path (const vfs_path_t * vpath, struct extfs_super_t **archive, int flags)
 767 {
 768     char *archive_name;
 769     int result = -1;
 770     GList *parc;
 771     int fstype;
 772     const vfs_path_element_t *path_element;
 773     struct extfs_super_t *a = NULL;
 774
 775     path_element = vfs_path_get_by_index (vpath, -1);
 776
 777     fstype = extfs_which (path_element->class, path_element->vfs_prefix);
 778     if (fstype == -1)
 779         return NULL;
 780
 781     archive_name = vfs_path_to_str_elements_count (vpath, -1);
 782
 783     /* All filesystems should have some local archive, at least it can be PATH_SEP ('/'). */
 784     parc = g_list_find_custom (extfs_subclass.supers, archive_name, extfs_cmp_archive);
 785     if (parc != NULL)
 786     {
 787         a = EXTFS_SUPER (parc->data);
 788         vfs_stamp (vfs_extfs_ops, (vfsid) a);
 789         g_free (archive_name);
 790     }
 791     else
 792     {
 793         if ((flags & FL_NO_OPEN) == 0)
 794             result = extfs_open_and_read_archive (fstype, archive_name, &a);
 795
 796         g_free (archive_name);
 797
 798         if (result == -1)
 799         {
 800             path_element->class->verrno = EIO;
 801             return NULL;
 802         }
 803     }
 804
 805     *archive = a;
 806     return path_element->path;
 807 }
 808
 809 /* --------------------------------------------------------------------------------------------- */
 810 /* Return allocated path (without leading slash) inside the archive  */
 811
 812 static char *
 813 extfs_get_path_from_entry (const struct vfs_s_entry *entry)
 814 {
 815     const struct vfs_s_entry *e;
 816     GString *localpath;
 817
 818     localpath = g_string_new ("");
 819
 820     for (e = entry; e->dir != NULL; e = e->dir->ent)
 821     {
 822         g_string_prepend (localpath, e->name);
 823         if (e->dir->ent->dir != NULL)
 824             g_string_prepend_c (localpath, PATH_SEP);
 825     }
 826
 827     return g_string_free (localpath, FALSE);
 828 }
 829
 830 /* --------------------------------------------------------------------------------------------- */
 831
 832 static struct vfs_s_entry *
 833 extfs_resolve_symlinks_int (struct vfs_s_entry *entry, GSList * list)
 834 {
 835     struct vfs_s_entry *pent = NULL;
 836
 837     if (!S_ISLNK (entry->ino->st.st_mode))
 838         return entry;
 839
 840     if (g_slist_find (list, entry) != NULL)
 841     {
 842         /* Here we protect us against symlink looping */
 843         errloop = TRUE;
 844     }
 845     else
 846     {
 847         GSList *looping;
 848
 849         looping = g_slist_prepend (list, entry);
 850         pent = extfs_find_entry_int (entry->dir, entry->ino->linkname, looping, FL_NONE);
 851         looping = g_slist_delete_link (looping, looping);
 852
 853         if (pent == NULL)
 854             my_errno = ENOENT;
 855     }
 856
 857     return pent;
 858 }
 859
 860 /* --------------------------------------------------------------------------------------------- */
 861
 862 static struct vfs_s_entry *
 863 extfs_resolve_symlinks (struct vfs_s_entry *entry)
 864 {
 865     struct vfs_s_entry *res;
 866
 867     errloop = FALSE;
 868     notadir = FALSE;
 869     res = extfs_resolve_symlinks_int (entry, NULL);
 870     if (res == NULL)
 871     {
 872         if (errloop)
 873             my_errno = ELOOP;
 874         else if (notadir)
 875             my_errno = ENOTDIR;
 876     }
 877     return res;
 878 }
 879
 880 /* --------------------------------------------------------------------------------------------- */
 881
 882 static char *
 883 extfs_get_archive_name (const struct extfs_super_t *archive)
 884 {
 885     const char *archive_name;
 886
 887     if (archive->local_name != NULL)
 888         archive_name = archive->local_name;
 889     else
 890         archive_name = CONST_VFS_SUPER (archive)->name;
 891
 892     if (archive_name == NULL || *archive_name == '\0')
 893         return g_strdup ("no_archive_name");
 894     else
 895     {
 896         char *ret_str;
 897         vfs_path_t *vpath;
 898         const vfs_path_element_t *path_element;
 899
 900         vpath = vfs_path_from_str (archive_name);
 901         path_element = vfs_path_get_by_index (vpath, -1);
 902         ret_str = g_strdup (path_element->path);
 903         vfs_path_free (vpath, TRUE);
 904         return ret_str;
 905     }
 906 }
 907
 908 /* --------------------------------------------------------------------------------------------- */
 909 /** Don't pass localname as NULL */
 910
 911 static int
 912 extfs_cmd (const char *str_extfs_cmd, const struct extfs_super_t *archive,
 913            const struct vfs_s_entry *entry, const char *localname)
 914 {
 915     char *file;
 916     char *quoted_file;
 917     char *quoted_localname;
 918     char *archive_name, *quoted_archive_name;
 919     const extfs_plugin_info_t *info;
 920     char *cmd;
 921     int retval = 0;
 922     GError *error = NULL;
 923     mc_pipe_t *pip;
 924
 925     file = extfs_get_path_from_entry (entry);
 926     quoted_file = name_quote (file, FALSE);
 927     g_free (file);
 928
 929     /* Skip leading "./" (if present) added in name_quote() */
 930     file = extfs_skip_leading_dotslash (quoted_file);
 931
 932     archive_name = extfs_get_archive_name (archive);
 933     quoted_archive_name = name_quote (archive_name, FALSE);
 934     g_free (archive_name);
 935     quoted_localname = name_quote (localname, FALSE);
 936     info = &g_array_index (extfs_plugins, extfs_plugin_info_t, archive->fstype);
 937     cmd = g_strconcat (info->path, info->prefix, str_extfs_cmd,
 938                        quoted_archive_name, " ", file, " ", quoted_localname, (char *) NULL);
 939     g_free (quoted_file);
 940     g_free (quoted_localname);
 941     g_free (quoted_archive_name);
 942
 943     /* don't read stdout */
 944     pip = mc_popen (cmd, FALSE, TRUE, &error);
 945     g_free (cmd);
 946
 947     if (pip == NULL)
 948     {
 949         message (D_ERROR, MSG_ERROR, _("EXTFS virtual file system:\n%s"), error->message);
 950         g_error_free (error);
 951         return (-1);
 952     }
 953
 954     pip->err.null_term = TRUE;
 955
 956     mc_pread (pip, &error);
 957     if (error != NULL)
 958     {
 959         message (D_ERROR, MSG_ERROR, _("EXTFS virtual file system:\n%s"), error->message);
 960         g_error_free (error);
 961         retval = -1;
 962     }
 963     else if (pip->err.len > 0)
 964         message (D_ERROR, MSG_ERROR, _("EXTFS virtual file system:\n%s"), pip->err.buf);
 965
 966     mc_pclose (pip, NULL);
 967
 968     return retval;
 969 }
 970
 971 /* --------------------------------------------------------------------------------------------- */
 972
 973 static void
 974 extfs_run (const vfs_path_t * vpath)
 975 {
 976     struct extfs_super_t *archive = NULL;
 977     const char *p;
 978     char *q, *archive_name, *quoted_archive_name;
 979     char *cmd;
 980     const extfs_plugin_info_t *info;
 981
 982     p = extfs_get_path (vpath, &archive, FL_NONE);
 983     if (p == NULL)
 984         return;
 985     q = name_quote (p, FALSE);
 986
 987     archive_name = extfs_get_archive_name (archive);
 988     quoted_archive_name = name_quote (archive_name, FALSE);
 989     g_free (archive_name);
 990     info = &g_array_index (extfs_plugins, extfs_plugin_info_t, archive->fstype);
 991     cmd =
 992         g_strconcat (info->path, info->prefix, " run ", quoted_archive_name, " ", q, (char *) NULL);
 993     g_free (quoted_archive_name);
 994     g_free (q);
 995     shell_execute (cmd, 0);
 996     g_free (cmd);
 997 }
 998
 999 /* --------------------------------------------------------------------------------------------- */
1000
1001 static void *
1002 extfs_open (const vfs_path_t * vpath, int flags, mode_t mode)
1003 {
1004     vfs_file_handler_t *extfs_info;
1005     struct extfs_super_t *archive = NULL;
1006     const char *q;
1007     struct vfs_s_entry *entry;
1008     int local_handle;
1009     gboolean created = FALSE;
1010
1011     q = extfs_get_path (vpath, &archive, FL_NONE);
1012     if (q == NULL)
1013         return NULL;
1014     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1015     if ((entry == NULL) && ((flags & O_CREAT) != 0))
1016     {
1017         /* Create new entry */
1018         entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_MKFILE);
1019         created = (entry != NULL);
1020     }
1021
1022     if (entry == NULL)
1023         return NULL;
1024     entry = extfs_resolve_symlinks (entry);
1025     if (entry == NULL)
1026         return NULL;
1027
1028     if (S_ISDIR (entry->ino->st.st_mode))
1029         ERRNOR (EISDIR, NULL);
1030
1031     if (entry->ino->localname == NULL)
1032     {
1033         vfs_path_t *local_filename_vpath;
1034         const char *local_filename;
1035
1036         local_handle = vfs_mkstemps (&local_filename_vpath, "extfs", entry->name);
1037
1038         if (local_handle == -1)
1039             return NULL;
1040         close (local_handle);
1041         local_filename = vfs_path_get_by_index (local_filename_vpath, -1)->path;
1042
1043         if (!created && ((flags & O_TRUNC) == 0)
1044             && extfs_cmd (" copyout ", archive, entry, local_filename))
1045         {
1046             unlink (local_filename);
1047             vfs_path_free (local_filename_vpath, TRUE);
1048             my_errno = EIO;
1049             return NULL;
1050         }
1051         entry->ino->localname = g_strdup (local_filename);
1052         vfs_path_free (local_filename_vpath, TRUE);
1053     }
1054
1055     local_handle = open (entry->ino->localname, NO_LINEAR (flags), mode);
1056
1057     if (local_handle == -1)
1058     {
1059         /* file exists(may be). Need to drop O_CREAT flag and truncate file content */
1060         flags = ~O_CREAT & (NO_LINEAR (flags) | O_TRUNC);
1061         local_handle = open (entry->ino->localname, flags, mode);
1062     }
1063
1064     if (local_handle == -1)
1065         ERRNOR (EIO, NULL);
1066
1067     extfs_info = g_new (vfs_file_handler_t, 1);
1068     vfs_s_init_fh (extfs_info, entry->ino, created);
1069     extfs_info->handle = local_handle;
1070
1071     /* i.e. we had no open files and now we have one */
1072     vfs_rmstamp (vfs_extfs_ops, (vfsid) archive);
1073     VFS_SUPER (archive)->fd_usage++;
1074     return extfs_info;
1075 }
1076
1077 /* --------------------------------------------------------------------------------------------- */
1078
1079 static ssize_t
1080 extfs_read (void *fh, char *buffer, size_t count)
1081 {
1082     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1083
1084     return read (file->handle, buffer, count);
1085 }
1086
1087 /* --------------------------------------------------------------------------------------------- */
1088
1089 static int
1090 extfs_close (void *fh)
1091 {
1092     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1093     int errno_code = 0;
1094
1095     close (file->handle);
1096     file->handle = -1;
1097
1098     /* Commit the file if it has changed */
1099     if (file->changed)
1100     {
1101         struct stat file_status;
1102
1103         if (extfs_cmd
1104             (" copyin ", EXTFS_SUPER (VFS_FILE_HANDLER_SUPER (fh)), file->ino->ent,
1105              file->ino->localname))
1106             errno_code = EIO;
1107
1108         if (stat (file->ino->localname, &file_status) != 0)
1109             errno_code = EIO;
1110         else
1111             file->ino->st.st_size = file_status.st_size;
1112
1113         file->ino->st.st_mtime = time (NULL);
1114     }
1115
1116     if (--VFS_FILE_HANDLER_SUPER (fh)->fd_usage == 0)
1117         vfs_stamp_create (vfs_extfs_ops, VFS_FILE_HANDLER_SUPER (fh));
1118
1119     g_free (fh);
1120     if (errno_code != 0)
1121         ERRNOR (EIO, -1);
1122     return 0;
1123 }
1124
1125 /* --------------------------------------------------------------------------------------------- */
1126
1127 static int
1128 extfs_errno (struct vfs_class *me)
1129 {
1130     (void) me;
1131     return my_errno;
1132 }
1133
1134 /* --------------------------------------------------------------------------------------------- */
1135
1136 static void *
1137 extfs_opendir (const vfs_path_t * vpath)
1138 {
1139     struct extfs_super_t *archive = NULL;
1140     const char *q;
1141     struct vfs_s_entry *entry;
1142     GList **info;
1143
1144     q = extfs_get_path (vpath, &archive, FL_NONE);
1145     if (q == NULL)
1146         return NULL;
1147     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1148     if (entry == NULL)
1149         return NULL;
1150     entry = extfs_resolve_symlinks (entry);
1151     if (entry == NULL)
1152         return NULL;
1153     if (!S_ISDIR (entry->ino->st.st_mode))
1154         ERRNOR (ENOTDIR, NULL);
1155
1156     info = g_new (GList *, 1);
1157     *info = g_queue_peek_head_link (entry->ino->subdir);
1158
1159     return info;
1160 }
1161
1162 /* --------------------------------------------------------------------------------------------- */
1163
1164 static struct vfs_dirent *
1165 extfs_readdir (void *data)
1166 {
1167     struct vfs_dirent *dir;
1168     GList **info = (GList **) data;
1169
1170     if (*info == NULL)
1171         return NULL;
1172
1173     dir = vfs_dirent_init (NULL, VFS_ENTRY ((*info)->data)->name, 0);   /* FIXME: inode */
1174
1175     *info = g_list_next (*info);
1176
1177     return dir;
1178 }
1179
1180 /* --------------------------------------------------------------------------------------------- */
1181
1182 static int
1183 extfs_closedir (void *data)
1184 {
1185     g_free (data);
1186     return 0;
1187 }
1188
1189 /* --------------------------------------------------------------------------------------------- */
1190
1191
1192 static void
1193 extfs_stat_move (struct stat *buf, const struct vfs_s_inode *inode)
1194 {
1195     *buf = inode->st;
1196
1197 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1198     buf->st_blksize = RECORDSIZE;
1199 #endif
1200     vfs_adjust_stat (buf);
1201 #ifdef HAVE_STRUCT_STAT_ST_MTIM
1202     buf->st_atim.tv_nsec = buf->st_mtim.tv_nsec = buf->st_ctim.tv_nsec = 0;
1203 #endif
1204 }
1205
1206 /* --------------------------------------------------------------------------------------------- */
1207
1208 static int
1209 extfs_internal_stat (const vfs_path_t * vpath, struct stat *buf, gboolean resolve)
1210 {
1211     struct extfs_super_t *archive;
1212     const char *q;
1213     struct vfs_s_entry *entry;
1214     int result = -1;
1215
1216     q = extfs_get_path (vpath, &archive, FL_NONE);
1217     if (q == NULL)
1218         goto cleanup;
1219     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1220     if (entry == NULL)
1221         goto cleanup;
1222     if (resolve)
1223     {
1224         entry = extfs_resolve_symlinks (entry);
1225         if (entry == NULL)
1226             goto cleanup;
1227     }
1228     extfs_stat_move (buf, entry->ino);
1229     result = 0;
1230   cleanup:
1231     return result;
1232 }
1233
1234 /* --------------------------------------------------------------------------------------------- */
1235
1236 static int
1237 extfs_stat (const vfs_path_t * vpath, struct stat *buf)
1238 {
1239     return extfs_internal_stat (vpath, buf, TRUE);
1240 }
1241
1242 /* --------------------------------------------------------------------------------------------- */
1243
1244 static int
1245 extfs_lstat (const vfs_path_t * vpath, struct stat *buf)
1246 {
1247     return extfs_internal_stat (vpath, buf, FALSE);
1248 }
1249
1250 /* --------------------------------------------------------------------------------------------- */
1251
1252 static int
1253 extfs_fstat (void *fh, struct stat *buf)
1254 {
1255     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1256
1257     extfs_stat_move (buf, file->ino);
1258     return 0;
1259 }
1260
1261 /* --------------------------------------------------------------------------------------------- */
1262
1263 static int
1264 extfs_readlink (const vfs_path_t * vpath, char *buf, size_t size)
1265 {
1266     struct extfs_super_t *archive;
1267     const char *q;
1268     size_t len;
1269     struct vfs_s_entry *entry;
1270     int result = -1;
1271
1272     q = extfs_get_path (vpath, &archive, FL_NONE);
1273     if (q == NULL)
1274         goto cleanup;
1275     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1276     if (entry == NULL)
1277         goto cleanup;
1278     if (!S_ISLNK (entry->ino->st.st_mode))
1279     {
1280         const vfs_path_element_t *path_element;
1281
1282         path_element = vfs_path_get_by_index (vpath, -1);
1283         path_element->class->verrno = EINVAL;
1284         goto cleanup;
1285     }
1286     len = strlen (entry->ino->linkname);
1287     if (size < len)
1288         len = size;
1289     /* readlink() does not append a NUL character to buf */
1290     result = len;
1291     memcpy (buf, entry->ino->linkname, result);
1292   cleanup:
1293     return result;
1294 }
1295
1296 /* --------------------------------------------------------------------------------------------- */
1297
1298 static int
1299 extfs_chown (const vfs_path_t * vpath, uid_t owner, gid_t group)
1300 {
1301     (void) vpath;
1302     (void) owner;
1303     (void) group;
1304     return 0;
1305 }
1306
1307 /* --------------------------------------------------------------------------------------------- */
1308
1309 static int
1310 extfs_chmod (const vfs_path_t * vpath, mode_t mode)
1311 {
1312     (void) vpath;
1313     (void) mode;
1314     return 0;
1315 }
1316
1317 /* --------------------------------------------------------------------------------------------- */
1318
1319 static ssize_t
1320 extfs_write (void *fh, const char *buf, size_t nbyte)
1321 {
1322     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1323
1324     file->changed = TRUE;
1325     return write (file->handle, buf, nbyte);
1326 }
1327
1328 /* --------------------------------------------------------------------------------------------- */
1329
1330 static int
1331 extfs_unlink (const vfs_path_t * vpath)
1332 {
1333     struct extfs_super_t *archive;
1334     const char *q;
1335     struct vfs_s_entry *entry;
1336     int result = -1;
1337
1338     q = extfs_get_path (vpath, &archive, FL_NONE);
1339     if (q == NULL)
1340         goto cleanup;
1341     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1342     if (entry == NULL)
1343         goto cleanup;
1344     entry = extfs_resolve_symlinks (entry);
1345     if (entry == NULL)
1346         goto cleanup;
1347     if (S_ISDIR (entry->ino->st.st_mode))
1348     {
1349         const vfs_path_element_t *path_element;
1350
1351         path_element = vfs_path_get_by_index (vpath, -1);
1352         path_element->class->verrno = EISDIR;
1353         goto cleanup;
1354     }
1355     if (extfs_cmd (" rm ", archive, entry, ""))
1356     {
1357         my_errno = EIO;
1358         goto cleanup;
1359     }
1360     vfs_s_free_entry (VFS_SUPER (archive)->me, entry);
1361     result = 0;
1362   cleanup:
1363     return result;
1364 }
1365
1366 /* --------------------------------------------------------------------------------------------- */
1367
1368 static int
1369 extfs_mkdir (const vfs_path_t * vpath, mode_t mode)
1370 {
1371     struct extfs_super_t *archive;
1372     const char *q;
1373     struct vfs_s_entry *entry;
1374     int result = -1;
1375     const vfs_path_element_t *path_element;
1376
1377     (void) mode;
1378
1379     path_element = vfs_path_get_by_index (vpath, -1);
1380     q = extfs_get_path (vpath, &archive, FL_NONE);
1381     if (q == NULL)
1382         goto cleanup;
1383     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1384     if (entry != NULL)
1385     {
1386         path_element->class->verrno = EEXIST;
1387         goto cleanup;
1388     }
1389     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_MKDIR);
1390     if (entry == NULL)
1391         goto cleanup;
1392     entry = extfs_resolve_symlinks (entry);
1393     if (entry == NULL)
1394         goto cleanup;
1395     if (!S_ISDIR (entry->ino->st.st_mode))
1396     {
1397         path_element->class->verrno = ENOTDIR;
1398         goto cleanup;
1399     }
1400
1401     if (extfs_cmd (" mkdir ", archive, entry, ""))
1402     {
1403         my_errno = EIO;
1404         vfs_s_free_entry (VFS_SUPER (archive)->me, entry);
1405         goto cleanup;
1406     }
1407     result = 0;
1408   cleanup:
1409     return result;
1410 }
1411
1412 /* --------------------------------------------------------------------------------------------- */
1413
1414 static int
1415 extfs_rmdir (const vfs_path_t * vpath)
1416 {
1417     struct extfs_super_t *archive;
1418     const char *q;
1419     struct vfs_s_entry *entry;
1420     int result = -1;
1421
1422     q = extfs_get_path (vpath, &archive, FL_NONE);
1423     if (q == NULL)
1424         goto cleanup;
1425     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1426     if (entry == NULL)
1427         goto cleanup;
1428     entry = extfs_resolve_symlinks (entry);
1429     if (entry == NULL)
1430         goto cleanup;
1431     if (!S_ISDIR (entry->ino->st.st_mode))
1432     {
1433         const vfs_path_element_t *path_element;
1434
1435         path_element = vfs_path_get_by_index (vpath, -1);
1436         path_element->class->verrno = ENOTDIR;
1437         goto cleanup;
1438     }
1439
1440     if (extfs_cmd (" rmdir ", archive, entry, ""))
1441     {
1442         my_errno = EIO;
1443         goto cleanup;
1444     }
1445     vfs_s_free_entry (VFS_SUPER (archive)->me, entry);
1446     result = 0;
1447   cleanup:
1448     return result;
1449 }
1450
1451 /* --------------------------------------------------------------------------------------------- */
1452
1453 static int
1454 extfs_chdir (const vfs_path_t * vpath)
1455 {
1456     void *data;
1457
1458     my_errno = ENOTDIR;
1459     data = extfs_opendir (vpath);
1460     if (data == NULL)
1461         return (-1);
1462     extfs_closedir (data);
1463     my_errno = 0;
1464     return 0;
1465 }
1466
1467 /* --------------------------------------------------------------------------------------------- */
1468
1469 static off_t
1470 extfs_lseek (void *fh, off_t offset, int whence)
1471 {
1472     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1473
1474     return lseek (file->handle, offset, whence);
1475 }
1476
1477 /* --------------------------------------------------------------------------------------------- */
1478
1479 static vfsid
1480 extfs_getid (const vfs_path_t * vpath)
1481 {
1482     struct extfs_super_t *archive = NULL;
1483     const char *p;
1484
1485     p = extfs_get_path (vpath, &archive, FL_NO_OPEN);
1486     return (p == NULL ? NULL : (vfsid) archive);
1487 }
1488
1489 /* --------------------------------------------------------------------------------------------- */
1490
1491 static vfs_path_t *
1492 extfs_getlocalcopy (const vfs_path_t * vpath)
1493 {
1494     vfs_file_handler_t *fh;
1495     vfs_path_t *p;
1496
1497     fh = VFS_FILE_HANDLER (extfs_open (vpath, O_RDONLY, 0));
1498     if (fh == NULL)
1499         return NULL;
1500     if (fh->ino->localname == NULL)
1501     {
1502         extfs_close ((void *) fh);
1503         return NULL;
1504     }
1505     p = vfs_path_from_str (fh->ino->localname);
1506     VFS_FILE_HANDLER_SUPER (fh)->fd_usage++;
1507     extfs_close ((void *) fh);
1508     return p;
1509 }
1510
1511 /* --------------------------------------------------------------------------------------------- */
1512
1513 static int
1514 extfs_ungetlocalcopy (const vfs_path_t * vpath, const vfs_path_t * local, gboolean has_changed)
1515 {
1516     vfs_file_handler_t *fh;
1517
1518     fh = VFS_FILE_HANDLER (extfs_open (vpath, O_RDONLY, 0));
1519     if (fh == NULL)
1520         return 0;
1521
1522     if (strcmp (fh->ino->localname, vfs_path_get_last_path_str (local)) == 0)
1523     {
1524         VFS_FILE_HANDLER_SUPER (fh)->fd_usage--;
1525         if (has_changed)
1526             fh->changed = TRUE;
1527         extfs_close ((void *) fh);
1528         return 0;
1529     }
1530     else
1531     {
1532         /* Should not happen */
1533         extfs_close ((void *) fh);
1534         return 0;
1535     }
1536 }
1537
1538 /* --------------------------------------------------------------------------------------------- */
1539
1540 static gboolean
1541 extfs_get_plugins (const char *where, gboolean silent)
1542 {
1543     char *dirname;
1544     GDir *dir;
1545     const char *filename;
1546
1547     dirname = g_build_path (PATH_SEP_STR, where, MC_EXTFS_DIR, (char *) NULL);
1548     dir = g_dir_open (dirname, 0, NULL);
1549
1550     /* We may not use vfs_die() message or message or similar,
1551      * UI is not initialized at this time and message would not
1552      * appear on screen. */
1553     if (dir == NULL)
1554     {
1555         if (!silent)
1556             fprintf (stderr, _("Warning: cannot open %s directory\n"), dirname);
1557         g_free (dirname);
1558         return FALSE;
1559     }
1560
1561     if (extfs_plugins == NULL)
1562         extfs_plugins = g_array_sized_new (FALSE, TRUE, sizeof (extfs_plugin_info_t), 32);
1563
1564     while ((filename = g_dir_read_name (dir)) != NULL)
1565     {
1566         char fullname[MC_MAXPATHLEN];
1567         struct stat s;
1568
1569         g_snprintf (fullname, sizeof (fullname), "%s" PATH_SEP_STR "%s", dirname, filename);
1570
1571         if ((stat (fullname, &s) == 0) && S_ISREG (s.st_mode) && !S_ISDIR (s.st_mode)
1572             && is_exe (s.st_mode))
1573         {
1574             int f;
1575
1576             f = open (fullname, O_RDONLY);
1577
1578             if (f >= 0)
1579             {
1580                 size_t len, i;
1581                 extfs_plugin_info_t info;
1582                 gboolean found = FALSE;
1583
1584                 close (f);
1585
1586                 /* Handle those with a trailing '+', those flag that the
1587                  * file system does not require an archive to work
1588                  */
1589                 len = strlen (filename);
1590                 info.need_archive = (filename[len - 1] != '+');
1591                 info.path = g_strconcat (dirname, PATH_SEP_STR, (char *) NULL);
1592                 info.prefix = g_strdup (filename);
1593
1594                 /* prepare to compare file names without trailing '+' */
1595                 if (!info.need_archive)
1596                     info.prefix[len - 1] = '\0';
1597
1598                 /* don't overload already found plugin */
1599                 for (i = 0; i < extfs_plugins->len; i++)
1600                 {
1601                     extfs_plugin_info_t *p;
1602
1603                     p = &g_array_index (extfs_plugins, extfs_plugin_info_t, i);
1604
1605                     /* 2 files with same names cannot be in a directory */
1606                     if ((strcmp (info.path, p->path) != 0)
1607                         && (strcmp (info.prefix, p->prefix) == 0))
1608                     {
1609                         found = TRUE;
1610                         break;
1611                     }
1612                 }
1613
1614                 if (found)
1615                 {
1616                     g_free (info.path);
1617                     g_free (info.prefix);
1618                 }
1619                 else
1620                 {
1621                     /* restore file name */
1622                     if (!info.need_archive)
1623                         info.prefix[len - 1] = '+';
1624                     g_array_append_val (extfs_plugins, info);
1625                 }
1626             }
1627         }
1628     }
1629
1630     g_dir_close (dir);
1631     g_free (dirname);
1632
1633     return TRUE;
1634 }
1635
1636 /* --------------------------------------------------------------------------------------------- */
1637
1638 static int
1639 extfs_init (struct vfs_class *me)
1640 {
1641     gboolean d1, d2;
1642
1643     (void) me;
1644
1645     /* 1st: scan user directory */
1646     d1 = extfs_get_plugins (mc_config_get_data_path (), TRUE);  /* silent about user dir */
1647     /* 2nd: scan system dir */
1648     d2 = extfs_get_plugins (LIBEXECDIR, d1);
1649
1650     return (d1 || d2 ? 1 : 0);
1651 }
1652
1653 /* --------------------------------------------------------------------------------------------- */
1654
1655 static void
1656 extfs_done (struct vfs_class *me)
1657 {
1658     size_t i;
1659
1660     while (VFS_SUBCLASS (me)->supers != NULL)
1661         me->free ((vfsid) VFS_SUBCLASS (me)->supers->data);
1662
1663     if (extfs_plugins == NULL)
1664         return;
1665
1666     for (i = 0; i < extfs_plugins->len; i++)
1667     {
1668         extfs_plugin_info_t *info;
1669
1670         info = &g_array_index (extfs_plugins, extfs_plugin_info_t, i);
1671         g_free (info->path);
1672         g_free (info->prefix);
1673     }
1674
1675     g_array_free (extfs_plugins, TRUE);
1676 }
1677
1678 /* --------------------------------------------------------------------------------------------- */
1679
1680 static int
1681 extfs_setctl (const vfs_path_t * vpath, int ctlop, void *arg)
1682 {
1683     (void) arg;
1684
1685     if (ctlop == VFS_SETCTL_RUN)
1686     {
1687         extfs_run (vpath);
1688         return 1;
1689     }
1690     return 0;
1691 }
1692
1693 /* --------------------------------------------------------------------------------------------- */
1694 /*** public functions ****************************************************************************/
1695 /* --------------------------------------------------------------------------------------------- */
1696
1697 void
1698 vfs_init_extfs (void)
1699 {
1700     vfs_init_subclass (&extfs_subclass, "extfs", VFSF_UNKNOWN, NULL);
1701     vfs_extfs_ops->init = extfs_init;
1702     vfs_extfs_ops->done = extfs_done;
1703     vfs_extfs_ops->fill_names = extfs_fill_names;
1704     vfs_extfs_ops->which = extfs_which;
1705     vfs_extfs_ops->open = extfs_open;
1706     vfs_extfs_ops->close = extfs_close;
1707     vfs_extfs_ops->read = extfs_read;
1708     vfs_extfs_ops->write = extfs_write;
1709     vfs_extfs_ops->opendir = extfs_opendir;
1710     vfs_extfs_ops->readdir = extfs_readdir;
1711     vfs_extfs_ops->closedir = extfs_closedir;
1712     vfs_extfs_ops->stat = extfs_stat;
1713     vfs_extfs_ops->lstat = extfs_lstat;
1714     vfs_extfs_ops->fstat = extfs_fstat;
1715     vfs_extfs_ops->chmod = extfs_chmod;
1716     vfs_extfs_ops->chown = extfs_chown;
1717     vfs_extfs_ops->readlink = extfs_readlink;
1718     vfs_extfs_ops->unlink = extfs_unlink;
1719     vfs_extfs_ops->chdir = extfs_chdir;
1720     vfs_extfs_ops->ferrno = extfs_errno;
1721     vfs_extfs_ops->lseek = extfs_lseek;
1722     vfs_extfs_ops->getid = extfs_getid;
1723     vfs_extfs_ops->getlocalcopy = extfs_getlocalcopy;
1724     vfs_extfs_ops->ungetlocalcopy = extfs_ungetlocalcopy;
1725     vfs_extfs_ops->mkdir = extfs_mkdir;
1726     vfs_extfs_ops->rmdir = extfs_rmdir;
1727     vfs_extfs_ops->setctl = extfs_setctl;
1728     extfs_subclass.free_inode = extfs_free_inode;
1729     extfs_subclass.free_archive = extfs_free_archive;
1730     vfs_register_class (vfs_extfs_ops);
1731 }
1732
1733 /* --------------------------------------------------------------------------------------------- */