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 = NULL;
 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     const char *local_last_path = NULL;
 525     vfs_path_t *name_vpath;
 526
 527     memset (&mystat, 0, sizeof (mystat));
 528
 529     name_vpath = vfs_path_from_str (name);
 530     info = &g_array_index (extfs_plugins, extfs_plugin_info_t, fstype);
 531
 532     if (info->need_archive)
 533     {
 534         if (mc_stat (name_vpath, &mystat) == -1)
 535             goto ret;
 536
 537         if (!vfs_file_is_local (name_vpath))
 538         {
 539             local_name_vpath = mc_getlocalcopy (name_vpath);
 540             if (local_name_vpath == NULL)
 541                 goto ret;
 542         }
 543
 544         local_last_path = vfs_path_get_last_path_str (local_name_vpath);
 545         if (local_last_path == NULL)
 546             tmp = name_quote (vfs_path_get_last_path_str (name_vpath), FALSE);
 547     }
 548
 549     if (local_last_path != NULL)
 550         cmd = g_strconcat (info->path, info->prefix, " list ", local_last_path, (char *) NULL);
 551     else if (tmp != NULL)
 552     {
 553         cmd = g_strconcat (info->path, info->prefix, " list ", tmp, (char *) NULL);
 554         g_free (tmp);
 555     }
 556
 557     if (cmd != NULL)
 558     {
 559         result = mc_popen (cmd, TRUE, TRUE, error);
 560         g_free (cmd);
 561     }
 562
 563     if (result == NULL)
 564     {
 565         if (local_name_vpath != NULL)
 566         {
 567             mc_ungetlocalcopy (name_vpath, local_name_vpath, FALSE);
 568             vfs_path_free (local_name_vpath, TRUE);
 569         }
 570         goto ret;
 571     }
 572
 573     current_archive = extfs_super_new (vfs_extfs_ops, name, local_name_vpath, fstype);
 574     current_archive->rdev = archive_counter++;
 575     vfs_path_free (local_name_vpath, TRUE);
 576
 577     mode = mystat.st_mode & 07777;
 578     if (mode & 0400)
 579         mode |= 0100;
 580     if (mode & 0040)
 581         mode |= 0010;
 582     if (mode & 0004)
 583         mode |= 0001;
 584     mode |= S_IFDIR;
 585
 586     root_entry = extfs_generate_entry (current_archive, PATH_SEP_STR, NULL, mode);
 587     root_entry->ino->st.st_uid = mystat.st_uid;
 588     root_entry->ino->st.st_gid = mystat.st_gid;
 589     root_entry->ino->st.st_atime = mystat.st_atime;
 590     root_entry->ino->st.st_ctime = mystat.st_ctime;
 591     root_entry->ino->st.st_mtime = mystat.st_mtime;
 592     root_entry->ino->ent = root_entry;
 593     VFS_SUPER (current_archive)->root = root_entry->ino;
 594
 595     *pparc = current_archive;
 596
 597   ret:
 598     vfs_path_free (name_vpath, TRUE);
 599     return result;
 600 }
 601
 602 /* --------------------------------------------------------------------------------------------- */
 603 /**
 604  * Main loop for reading an archive.
 605  * Return 0 on success, -1 on error.
 606  */
 607
 608 static int
 609 extfs_read_archive (mc_pipe_t * pip, struct extfs_super_t *archive, GError ** error)
 610 {
 611     int ret = 0;
 612     GString *buffer;
 613     GString *err_msg = NULL;
 614     GString *remain_file_name = NULL;
 615
 616     while (ret != -1)
 617     {
 618         /* init buffers before call of mc_pread() */
 619         pip->out.len = MC_PIPE_BUFSIZE;
 620         pip->err.len = MC_PIPE_BUFSIZE;
 621
 622         mc_pread (pip, error);
 623
 624         if (*error != NULL)
 625             return (-1);
 626
 627         if (pip->err.len > 0)
 628         {
 629             /* join errors/warnings */
 630             if (err_msg == NULL)
 631                 err_msg = g_string_new_len (pip->err.buf, pip->err.len);
 632             else
 633             {
 634                 if (err_msg->str[err_msg->len - 1] != '\n')
 635                     g_string_append_c (err_msg, '\n');
 636                 g_string_append_len (err_msg, pip->err.buf, pip->err.len);
 637             }
 638         }
 639
 640         if (pip->out.len == MC_PIPE_STREAM_EOF)
 641             break;
 642
 643         if (pip->out.len == 0)
 644             continue;
 645
 646         if (pip->out.len == MC_PIPE_ERROR_READ)
 647             return (-1);
 648
 649         while (ret != -1 && (buffer = mc_pstream_get_string (&pip->out)) != NULL)
 650         {
 651             /* handle a \n-separated file list */
 652
 653             if (buffer->str[buffer->len - 1] == '\n')
 654             {
 655                 /* entire file name or last chunk */
 656
 657                 g_string_truncate (buffer, buffer->len - 1);
 658
 659                 /* join filename chunks */
 660                 if (remain_file_name != NULL)
 661                 {
 662                     g_string_append_len (remain_file_name, buffer->str, buffer->len);
 663                     g_string_free (buffer, TRUE);
 664                     buffer = remain_file_name;
 665                     remain_file_name = NULL;
 666                 }
 667             }
 668             else
 669             {
 670                 /* first or middle chunk of file name */
 671
 672                 if (remain_file_name == NULL)
 673                     remain_file_name = buffer;
 674                 else
 675                 {
 676                     g_string_append_len (remain_file_name, buffer->str, buffer->len);
 677                     g_string_free (buffer, TRUE);
 678                 }
 679
 680                 continue;
 681             }
 682
 683             ret = extfs_add_file (archive, buffer->str);
 684
 685             g_string_free (buffer, TRUE);
 686         }
 687     }
 688
 689     if (remain_file_name != NULL)
 690         g_string_free (remain_file_name, TRUE);
 691
 692     if (err_msg != NULL)
 693     {
 694         if (*error == NULL)
 695             mc_propagate_error (error, 0, "%s", err_msg->str);
 696
 697         g_string_free (err_msg, TRUE);
 698     }
 699
 700     return ret;
 701 }
 702
 703 /* --------------------------------------------------------------------------------------------- */
 704
 705 static int
 706 extfs_which (struct vfs_class *me, const char *path)
 707 {
 708     size_t path_len;
 709     size_t i;
 710
 711     (void) me;
 712
 713     path_len = strlen (path);
 714
 715     for (i = 0; i < extfs_plugins->len; i++)
 716     {
 717         extfs_plugin_info_t *info;
 718
 719         info = &g_array_index (extfs_plugins, extfs_plugin_info_t, i);
 720
 721         if ((strncmp (path, info->prefix, path_len) == 0)
 722             && ((info->prefix[path_len] == '\0') || (info->prefix[path_len] == '+')))
 723             return i;
 724     }
 725     return -1;
 726 }
 727
 728 /* --------------------------------------------------------------------------------------------- */
 729
 730 static int
 731 extfs_open_and_read_archive (int fstype, const char *name, struct extfs_super_t **archive)
 732 {
 733     int result = -1;
 734     struct extfs_super_t *a;
 735     mc_pipe_t *pip;
 736     GError *error = NULL;
 737
 738     pip = extfs_open_archive (fstype, name, archive, &error);
 739
 740     a = *archive;
 741
 742     if (pip == NULL)
 743     {
 744         const extfs_plugin_info_t *info;
 745
 746         info = &g_array_index (extfs_plugins, extfs_plugin_info_t, fstype);
 747         message (D_ERROR, MSG_ERROR, _("Cannot open %s archive\n%s:\n%s"), info->prefix, name,
 748                  error->message);
 749         g_error_free (error);
 750     }
 751     else
 752     {
 753         result = extfs_read_archive (pip, a, &error);
 754
 755         if (result != 0)
 756             VFS_SUPER (a)->me->free (VFS_SUPER (a));
 757
 758         if (error != NULL)
 759         {
 760             message (D_ERROR, MSG_ERROR, _("EXTFS virtual file system:\n%s"), error->message);
 761             g_error_free (error);
 762         }
 763
 764         mc_pclose (pip, NULL);
 765     }
 766
 767     return result;
 768 }
 769
 770 /* --------------------------------------------------------------------------------------------- */
 771 /**
 772  * Dissect the path and create corresponding superblock.
 773  */
 774 static const char *
 775 extfs_get_path (const vfs_path_t * vpath, struct extfs_super_t **archive, int flags)
 776 {
 777     char *archive_name;
 778     int result = -1;
 779     GList *parc;
 780     int fstype;
 781     const vfs_path_element_t *path_element;
 782     struct extfs_super_t *a = NULL;
 783
 784     path_element = vfs_path_get_by_index (vpath, -1);
 785
 786     fstype = extfs_which (path_element->class, path_element->vfs_prefix);
 787     if (fstype == -1)
 788         return NULL;
 789
 790     archive_name = vfs_path_to_str_elements_count (vpath, -1);
 791
 792     /* All filesystems should have some local archive, at least it can be PATH_SEP ('/'). */
 793     parc = g_list_find_custom (extfs_subclass.supers, archive_name, extfs_cmp_archive);
 794     if (parc != NULL)
 795     {
 796         a = EXTFS_SUPER (parc->data);
 797         vfs_stamp (vfs_extfs_ops, (vfsid) a);
 798         g_free (archive_name);
 799     }
 800     else
 801     {
 802         if ((flags & FL_NO_OPEN) == 0)
 803             result = extfs_open_and_read_archive (fstype, archive_name, &a);
 804
 805         g_free (archive_name);
 806
 807         if (result == -1)
 808         {
 809             path_element->class->verrno = EIO;
 810             return NULL;
 811         }
 812     }
 813
 814     *archive = a;
 815     return path_element->path;
 816 }
 817
 818 /* --------------------------------------------------------------------------------------------- */
 819 /* Return allocated path (without leading slash) inside the archive  */
 820
 821 static char *
 822 extfs_get_path_from_entry (const struct vfs_s_entry *entry)
 823 {
 824     const struct vfs_s_entry *e;
 825     GString *localpath;
 826
 827     localpath = g_string_new ("");
 828
 829     for (e = entry; e->dir != NULL; e = e->dir->ent)
 830     {
 831         g_string_prepend (localpath, e->name);
 832         if (e->dir->ent->dir != NULL)
 833             g_string_prepend_c (localpath, PATH_SEP);
 834     }
 835
 836     return g_string_free (localpath, FALSE);
 837 }
 838
 839 /* --------------------------------------------------------------------------------------------- */
 840
 841 static struct vfs_s_entry *
 842 extfs_resolve_symlinks_int (struct vfs_s_entry *entry, GSList * list)
 843 {
 844     struct vfs_s_entry *pent = NULL;
 845
 846     if (!S_ISLNK (entry->ino->st.st_mode))
 847         return entry;
 848
 849     if (g_slist_find (list, entry) != NULL)
 850     {
 851         /* Here we protect us against symlink looping */
 852         errloop = TRUE;
 853     }
 854     else
 855     {
 856         GSList *looping;
 857
 858         looping = g_slist_prepend (list, entry);
 859         pent = extfs_find_entry_int (entry->dir, entry->ino->linkname, looping, FL_NONE);
 860         looping = g_slist_delete_link (looping, looping);
 861
 862         if (pent == NULL)
 863             my_errno = ENOENT;
 864     }
 865
 866     return pent;
 867 }
 868
 869 /* --------------------------------------------------------------------------------------------- */
 870
 871 static struct vfs_s_entry *
 872 extfs_resolve_symlinks (struct vfs_s_entry *entry)
 873 {
 874     struct vfs_s_entry *res;
 875
 876     errloop = FALSE;
 877     notadir = FALSE;
 878     res = extfs_resolve_symlinks_int (entry, NULL);
 879     if (res == NULL)
 880     {
 881         if (errloop)
 882             my_errno = ELOOP;
 883         else if (notadir)
 884             my_errno = ENOTDIR;
 885     }
 886     return res;
 887 }
 888
 889 /* --------------------------------------------------------------------------------------------- */
 890
 891 static char *
 892 extfs_get_archive_name (const struct extfs_super_t *archive)
 893 {
 894     const char *archive_name;
 895
 896     if (archive->local_name != NULL)
 897         archive_name = archive->local_name;
 898     else
 899         archive_name = CONST_VFS_SUPER (archive)->name;
 900
 901     if (archive_name == NULL || *archive_name == '\0')
 902         return g_strdup ("no_archive_name");
 903     else
 904     {
 905         char *ret_str;
 906         vfs_path_t *vpath;
 907         const vfs_path_element_t *path_element;
 908
 909         vpath = vfs_path_from_str (archive_name);
 910         path_element = vfs_path_get_by_index (vpath, -1);
 911         ret_str = g_strdup (path_element->path);
 912         vfs_path_free (vpath, TRUE);
 913         return ret_str;
 914     }
 915 }
 916
 917 /* --------------------------------------------------------------------------------------------- */
 918 /** Don't pass localname as NULL */
 919
 920 static int
 921 extfs_cmd (const char *str_extfs_cmd, const struct extfs_super_t *archive,
 922            const struct vfs_s_entry *entry, const char *localname)
 923 {
 924     char *file;
 925     char *quoted_file;
 926     char *quoted_localname;
 927     char *archive_name, *quoted_archive_name;
 928     const extfs_plugin_info_t *info;
 929     char *cmd;
 930     int retval = 0;
 931     GError *error = NULL;
 932     mc_pipe_t *pip;
 933
 934     file = extfs_get_path_from_entry (entry);
 935     quoted_file = name_quote (file, FALSE);
 936     g_free (file);
 937
 938     /* Skip leading "./" (if present) added in name_quote() */
 939     file = extfs_skip_leading_dotslash (quoted_file);
 940
 941     archive_name = extfs_get_archive_name (archive);
 942     quoted_archive_name = name_quote (archive_name, FALSE);
 943     g_free (archive_name);
 944     quoted_localname = name_quote (localname, FALSE);
 945     info = &g_array_index (extfs_plugins, extfs_plugin_info_t, archive->fstype);
 946     cmd = g_strconcat (info->path, info->prefix, str_extfs_cmd,
 947                        quoted_archive_name, " ", file, " ", quoted_localname, (char *) NULL);
 948     g_free (quoted_file);
 949     g_free (quoted_localname);
 950     g_free (quoted_archive_name);
 951
 952     /* don't read stdout */
 953     pip = mc_popen (cmd, FALSE, TRUE, &error);
 954     g_free (cmd);
 955
 956     if (pip == NULL)
 957     {
 958         message (D_ERROR, MSG_ERROR, _("EXTFS virtual file system:\n%s"), error->message);
 959         g_error_free (error);
 960         return (-1);
 961     }
 962
 963     pip->err.null_term = TRUE;
 964
 965     mc_pread (pip, &error);
 966     if (error != NULL)
 967     {
 968         message (D_ERROR, MSG_ERROR, _("EXTFS virtual file system:\n%s"), error->message);
 969         g_error_free (error);
 970         retval = -1;
 971     }
 972     else if (pip->err.len > 0)
 973         message (D_ERROR, MSG_ERROR, _("EXTFS virtual file system:\n%s"), pip->err.buf);
 974
 975     mc_pclose (pip, NULL);
 976
 977     return retval;
 978 }
 979
 980 /* --------------------------------------------------------------------------------------------- */
 981
 982 static void
 983 extfs_run (const vfs_path_t * vpath)
 984 {
 985     struct extfs_super_t *archive = NULL;
 986     const char *p;
 987     char *q, *archive_name, *quoted_archive_name;
 988     char *cmd;
 989     const extfs_plugin_info_t *info;
 990
 991     p = extfs_get_path (vpath, &archive, FL_NONE);
 992     if (p == NULL)
 993         return;
 994     q = name_quote (p, FALSE);
 995
 996     archive_name = extfs_get_archive_name (archive);
 997     quoted_archive_name = name_quote (archive_name, FALSE);
 998     g_free (archive_name);
 999     info = &g_array_index (extfs_plugins, extfs_plugin_info_t, archive->fstype);
1000     cmd =
1001         g_strconcat (info->path, info->prefix, " run ", quoted_archive_name, " ", q, (char *) NULL);
1002     g_free (quoted_archive_name);
1003     g_free (q);
1004     shell_execute (cmd, 0);
1005     g_free (cmd);
1006 }
1007
1008 /* --------------------------------------------------------------------------------------------- */
1009
1010 static void *
1011 extfs_open (const vfs_path_t * vpath, int flags, mode_t mode)
1012 {
1013     vfs_file_handler_t *extfs_info;
1014     struct extfs_super_t *archive = NULL;
1015     const char *q;
1016     struct vfs_s_entry *entry;
1017     int local_handle;
1018     gboolean created = FALSE;
1019
1020     q = extfs_get_path (vpath, &archive, FL_NONE);
1021     if (q == NULL)
1022         return NULL;
1023     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1024     if ((entry == NULL) && ((flags & O_CREAT) != 0))
1025     {
1026         /* Create new entry */
1027         entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_MKFILE);
1028         created = (entry != NULL);
1029     }
1030
1031     if (entry == NULL)
1032         return NULL;
1033     entry = extfs_resolve_symlinks (entry);
1034     if (entry == NULL)
1035         return NULL;
1036
1037     if (S_ISDIR (entry->ino->st.st_mode))
1038         ERRNOR (EISDIR, NULL);
1039
1040     if (entry->ino->localname == NULL)
1041     {
1042         vfs_path_t *local_filename_vpath;
1043         const char *local_filename;
1044
1045         local_handle = vfs_mkstemps (&local_filename_vpath, "extfs", entry->name);
1046
1047         if (local_handle == -1)
1048             return NULL;
1049         close (local_handle);
1050         local_filename = vfs_path_get_by_index (local_filename_vpath, -1)->path;
1051
1052         if (!created && ((flags & O_TRUNC) == 0)
1053             && extfs_cmd (" copyout ", archive, entry, local_filename))
1054         {
1055             unlink (local_filename);
1056             vfs_path_free (local_filename_vpath, TRUE);
1057             my_errno = EIO;
1058             return NULL;
1059         }
1060         entry->ino->localname = g_strdup (local_filename);
1061         vfs_path_free (local_filename_vpath, TRUE);
1062     }
1063
1064     local_handle = open (entry->ino->localname, NO_LINEAR (flags), mode);
1065
1066     if (local_handle == -1)
1067     {
1068         /* file exists(may be). Need to drop O_CREAT flag and truncate file content */
1069         flags = ~O_CREAT & (NO_LINEAR (flags) | O_TRUNC);
1070         local_handle = open (entry->ino->localname, flags, mode);
1071     }
1072
1073     if (local_handle == -1)
1074         ERRNOR (EIO, NULL);
1075
1076     extfs_info = g_new (vfs_file_handler_t, 1);
1077     vfs_s_init_fh (extfs_info, entry->ino, created);
1078     extfs_info->handle = local_handle;
1079
1080     /* i.e. we had no open files and now we have one */
1081     vfs_rmstamp (vfs_extfs_ops, (vfsid) archive);
1082     VFS_SUPER (archive)->fd_usage++;
1083     return extfs_info;
1084 }
1085
1086 /* --------------------------------------------------------------------------------------------- */
1087
1088 static ssize_t
1089 extfs_read (void *fh, char *buffer, size_t count)
1090 {
1091     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1092
1093     return read (file->handle, buffer, count);
1094 }
1095
1096 /* --------------------------------------------------------------------------------------------- */
1097
1098 static int
1099 extfs_close (void *fh)
1100 {
1101     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1102     int errno_code = 0;
1103
1104     close (file->handle);
1105     file->handle = -1;
1106
1107     /* Commit the file if it has changed */
1108     if (file->changed)
1109     {
1110         struct stat file_status;
1111
1112         if (extfs_cmd
1113             (" copyin ", EXTFS_SUPER (VFS_FILE_HANDLER_SUPER (fh)), file->ino->ent,
1114              file->ino->localname))
1115             errno_code = EIO;
1116
1117         if (stat (file->ino->localname, &file_status) != 0)
1118             errno_code = EIO;
1119         else
1120             file->ino->st.st_size = file_status.st_size;
1121
1122         file->ino->st.st_mtime = time (NULL);
1123     }
1124
1125     if (--VFS_FILE_HANDLER_SUPER (fh)->fd_usage == 0)
1126         vfs_stamp_create (vfs_extfs_ops, VFS_FILE_HANDLER_SUPER (fh));
1127
1128     g_free (fh);
1129     if (errno_code != 0)
1130         ERRNOR (EIO, -1);
1131     return 0;
1132 }
1133
1134 /* --------------------------------------------------------------------------------------------- */
1135
1136 static int
1137 extfs_errno (struct vfs_class *me)
1138 {
1139     (void) me;
1140     return my_errno;
1141 }
1142
1143 /* --------------------------------------------------------------------------------------------- */
1144
1145 static void *
1146 extfs_opendir (const vfs_path_t * vpath)
1147 {
1148     struct extfs_super_t *archive = NULL;
1149     const char *q;
1150     struct vfs_s_entry *entry;
1151     GList **info;
1152
1153     q = extfs_get_path (vpath, &archive, FL_NONE);
1154     if (q == NULL)
1155         return NULL;
1156     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1157     if (entry == NULL)
1158         return NULL;
1159     entry = extfs_resolve_symlinks (entry);
1160     if (entry == NULL)
1161         return NULL;
1162     if (!S_ISDIR (entry->ino->st.st_mode))
1163         ERRNOR (ENOTDIR, NULL);
1164
1165     info = g_new (GList *, 1);
1166     *info = g_queue_peek_head_link (entry->ino->subdir);
1167
1168     return info;
1169 }
1170
1171 /* --------------------------------------------------------------------------------------------- */
1172
1173 static struct vfs_dirent *
1174 extfs_readdir (void *data)
1175 {
1176     struct vfs_dirent *dir;
1177     GList **info = (GList **) data;
1178
1179     if (*info == NULL)
1180         return NULL;
1181
1182     dir = vfs_dirent_init (NULL, VFS_ENTRY ((*info)->data)->name, 0);   /* FIXME: inode */
1183
1184     *info = g_list_next (*info);
1185
1186     return dir;
1187 }
1188
1189 /* --------------------------------------------------------------------------------------------- */
1190
1191 static int
1192 extfs_closedir (void *data)
1193 {
1194     g_free (data);
1195     return 0;
1196 }
1197
1198 /* --------------------------------------------------------------------------------------------- */
1199
1200
1201 static void
1202 extfs_stat_move (struct stat *buf, const struct vfs_s_inode *inode)
1203 {
1204     *buf = inode->st;
1205
1206 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1207     buf->st_blksize = RECORDSIZE;
1208 #endif
1209     vfs_adjust_stat (buf);
1210 #ifdef HAVE_STRUCT_STAT_ST_MTIM
1211     buf->st_atim.tv_nsec = buf->st_mtim.tv_nsec = buf->st_ctim.tv_nsec = 0;
1212 #endif
1213 }
1214
1215 /* --------------------------------------------------------------------------------------------- */
1216
1217 static int
1218 extfs_internal_stat (const vfs_path_t * vpath, struct stat *buf, gboolean resolve)
1219 {
1220     struct extfs_super_t *archive;
1221     const char *q;
1222     struct vfs_s_entry *entry;
1223     int result = -1;
1224
1225     q = extfs_get_path (vpath, &archive, FL_NONE);
1226     if (q == NULL)
1227         goto cleanup;
1228     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1229     if (entry == NULL)
1230         goto cleanup;
1231     if (resolve)
1232     {
1233         entry = extfs_resolve_symlinks (entry);
1234         if (entry == NULL)
1235             goto cleanup;
1236     }
1237     extfs_stat_move (buf, entry->ino);
1238     result = 0;
1239   cleanup:
1240     return result;
1241 }
1242
1243 /* --------------------------------------------------------------------------------------------- */
1244
1245 static int
1246 extfs_stat (const vfs_path_t * vpath, struct stat *buf)
1247 {
1248     return extfs_internal_stat (vpath, buf, TRUE);
1249 }
1250
1251 /* --------------------------------------------------------------------------------------------- */
1252
1253 static int
1254 extfs_lstat (const vfs_path_t * vpath, struct stat *buf)
1255 {
1256     return extfs_internal_stat (vpath, buf, FALSE);
1257 }
1258
1259 /* --------------------------------------------------------------------------------------------- */
1260
1261 static int
1262 extfs_fstat (void *fh, struct stat *buf)
1263 {
1264     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1265
1266     extfs_stat_move (buf, file->ino);
1267     return 0;
1268 }
1269
1270 /* --------------------------------------------------------------------------------------------- */
1271
1272 static int
1273 extfs_readlink (const vfs_path_t * vpath, char *buf, size_t size)
1274 {
1275     struct extfs_super_t *archive;
1276     const char *q;
1277     size_t len;
1278     struct vfs_s_entry *entry;
1279     int result = -1;
1280
1281     q = extfs_get_path (vpath, &archive, FL_NONE);
1282     if (q == NULL)
1283         goto cleanup;
1284     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1285     if (entry == NULL)
1286         goto cleanup;
1287     if (!S_ISLNK (entry->ino->st.st_mode))
1288     {
1289         const vfs_path_element_t *path_element;
1290
1291         path_element = vfs_path_get_by_index (vpath, -1);
1292         path_element->class->verrno = EINVAL;
1293         goto cleanup;
1294     }
1295     len = strlen (entry->ino->linkname);
1296     if (size < len)
1297         len = size;
1298     /* readlink() does not append a NUL character to buf */
1299     result = len;
1300     memcpy (buf, entry->ino->linkname, result);
1301   cleanup:
1302     return result;
1303 }
1304
1305 /* --------------------------------------------------------------------------------------------- */
1306
1307 static int
1308 extfs_chown (const vfs_path_t * vpath, uid_t owner, gid_t group)
1309 {
1310     (void) vpath;
1311     (void) owner;
1312     (void) group;
1313     return 0;
1314 }
1315
1316 /* --------------------------------------------------------------------------------------------- */
1317
1318 static int
1319 extfs_chmod (const vfs_path_t * vpath, mode_t mode)
1320 {
1321     (void) vpath;
1322     (void) mode;
1323     return 0;
1324 }
1325
1326 /* --------------------------------------------------------------------------------------------- */
1327
1328 static ssize_t
1329 extfs_write (void *fh, const char *buf, size_t nbyte)
1330 {
1331     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1332
1333     file->changed = TRUE;
1334     return write (file->handle, buf, nbyte);
1335 }
1336
1337 /* --------------------------------------------------------------------------------------------- */
1338
1339 static int
1340 extfs_unlink (const vfs_path_t * vpath)
1341 {
1342     struct extfs_super_t *archive;
1343     const char *q;
1344     struct vfs_s_entry *entry;
1345     int result = -1;
1346
1347     q = extfs_get_path (vpath, &archive, FL_NONE);
1348     if (q == NULL)
1349         goto cleanup;
1350     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1351     if (entry == NULL)
1352         goto cleanup;
1353     entry = extfs_resolve_symlinks (entry);
1354     if (entry == NULL)
1355         goto cleanup;
1356     if (S_ISDIR (entry->ino->st.st_mode))
1357     {
1358         const vfs_path_element_t *path_element;
1359
1360         path_element = vfs_path_get_by_index (vpath, -1);
1361         path_element->class->verrno = EISDIR;
1362         goto cleanup;
1363     }
1364     if (extfs_cmd (" rm ", archive, entry, ""))
1365     {
1366         my_errno = EIO;
1367         goto cleanup;
1368     }
1369     vfs_s_free_entry (VFS_SUPER (archive)->me, entry);
1370     result = 0;
1371   cleanup:
1372     return result;
1373 }
1374
1375 /* --------------------------------------------------------------------------------------------- */
1376
1377 static int
1378 extfs_mkdir (const vfs_path_t * vpath, mode_t mode)
1379 {
1380     struct extfs_super_t *archive;
1381     const char *q;
1382     struct vfs_s_entry *entry;
1383     int result = -1;
1384     const vfs_path_element_t *path_element;
1385
1386     (void) mode;
1387
1388     path_element = vfs_path_get_by_index (vpath, -1);
1389     q = extfs_get_path (vpath, &archive, FL_NONE);
1390     if (q == NULL)
1391         goto cleanup;
1392     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1393     if (entry != NULL)
1394     {
1395         path_element->class->verrno = EEXIST;
1396         goto cleanup;
1397     }
1398     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_MKDIR);
1399     if (entry == NULL)
1400         goto cleanup;
1401     entry = extfs_resolve_symlinks (entry);
1402     if (entry == NULL)
1403         goto cleanup;
1404     if (!S_ISDIR (entry->ino->st.st_mode))
1405     {
1406         path_element->class->verrno = ENOTDIR;
1407         goto cleanup;
1408     }
1409
1410     if (extfs_cmd (" mkdir ", archive, entry, ""))
1411     {
1412         my_errno = EIO;
1413         vfs_s_free_entry (VFS_SUPER (archive)->me, entry);
1414         goto cleanup;
1415     }
1416     result = 0;
1417   cleanup:
1418     return result;
1419 }
1420
1421 /* --------------------------------------------------------------------------------------------- */
1422
1423 static int
1424 extfs_rmdir (const vfs_path_t * vpath)
1425 {
1426     struct extfs_super_t *archive;
1427     const char *q;
1428     struct vfs_s_entry *entry;
1429     int result = -1;
1430
1431     q = extfs_get_path (vpath, &archive, FL_NONE);
1432     if (q == NULL)
1433         goto cleanup;
1434     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1435     if (entry == NULL)
1436         goto cleanup;
1437     entry = extfs_resolve_symlinks (entry);
1438     if (entry == NULL)
1439         goto cleanup;
1440     if (!S_ISDIR (entry->ino->st.st_mode))
1441     {
1442         const vfs_path_element_t *path_element;
1443
1444         path_element = vfs_path_get_by_index (vpath, -1);
1445         path_element->class->verrno = ENOTDIR;
1446         goto cleanup;
1447     }
1448
1449     if (extfs_cmd (" rmdir ", archive, entry, ""))
1450     {
1451         my_errno = EIO;
1452         goto cleanup;
1453     }
1454     vfs_s_free_entry (VFS_SUPER (archive)->me, entry);
1455     result = 0;
1456   cleanup:
1457     return result;
1458 }
1459
1460 /* --------------------------------------------------------------------------------------------- */
1461
1462 static int
1463 extfs_chdir (const vfs_path_t * vpath)
1464 {
1465     void *data;
1466
1467     my_errno = ENOTDIR;
1468     data = extfs_opendir (vpath);
1469     if (data == NULL)
1470         return (-1);
1471     extfs_closedir (data);
1472     my_errno = 0;
1473     return 0;
1474 }
1475
1476 /* --------------------------------------------------------------------------------------------- */
1477
1478 static off_t
1479 extfs_lseek (void *fh, off_t offset, int whence)
1480 {
1481     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1482
1483     return lseek (file->handle, offset, whence);
1484 }
1485
1486 /* --------------------------------------------------------------------------------------------- */
1487
1488 static vfsid
1489 extfs_getid (const vfs_path_t * vpath)
1490 {
1491     struct extfs_super_t *archive = NULL;
1492     const char *p;
1493
1494     p = extfs_get_path (vpath, &archive, FL_NO_OPEN);
1495     return (p == NULL ? NULL : (vfsid) archive);
1496 }
1497
1498 /* --------------------------------------------------------------------------------------------- */
1499
1500 static vfs_path_t *
1501 extfs_getlocalcopy (const vfs_path_t * vpath)
1502 {
1503     vfs_file_handler_t *fh;
1504     vfs_path_t *p;
1505
1506     fh = VFS_FILE_HANDLER (extfs_open (vpath, O_RDONLY, 0));
1507     if (fh == NULL)
1508         return NULL;
1509     if (fh->ino->localname == NULL)
1510     {
1511         extfs_close ((void *) fh);
1512         return NULL;
1513     }
1514     p = vfs_path_from_str (fh->ino->localname);
1515     VFS_FILE_HANDLER_SUPER (fh)->fd_usage++;
1516     extfs_close ((void *) fh);
1517     return p;
1518 }
1519
1520 /* --------------------------------------------------------------------------------------------- */
1521
1522 static int
1523 extfs_ungetlocalcopy (const vfs_path_t * vpath, const vfs_path_t * local, gboolean has_changed)
1524 {
1525     vfs_file_handler_t *fh;
1526
1527     fh = VFS_FILE_HANDLER (extfs_open (vpath, O_RDONLY, 0));
1528     if (fh == NULL)
1529         return 0;
1530
1531     if (strcmp (fh->ino->localname, vfs_path_get_last_path_str (local)) == 0)
1532     {
1533         VFS_FILE_HANDLER_SUPER (fh)->fd_usage--;
1534         if (has_changed)
1535             fh->changed = TRUE;
1536         extfs_close ((void *) fh);
1537         return 0;
1538     }
1539     else
1540     {
1541         /* Should not happen */
1542         extfs_close ((void *) fh);
1543         return 0;
1544     }
1545 }
1546
1547 /* --------------------------------------------------------------------------------------------- */
1548
1549 static gboolean
1550 extfs_get_plugins (const char *where, gboolean silent)
1551 {
1552     char *dirname;
1553     GDir *dir;
1554     const char *filename;
1555
1556     dirname = g_build_path (PATH_SEP_STR, where, MC_EXTFS_DIR, (char *) NULL);
1557     dir = g_dir_open (dirname, 0, NULL);
1558
1559     /* We may not use vfs_die() message or message or similar,
1560      * UI is not initialized at this time and message would not
1561      * appear on screen. */
1562     if (dir == NULL)
1563     {
1564         if (!silent)
1565             fprintf (stderr, _("Warning: cannot open %s directory\n"), dirname);
1566         g_free (dirname);
1567         return FALSE;
1568     }
1569
1570     if (extfs_plugins == NULL)
1571         extfs_plugins = g_array_sized_new (FALSE, TRUE, sizeof (extfs_plugin_info_t), 32);
1572
1573     while ((filename = g_dir_read_name (dir)) != NULL)
1574     {
1575         char fullname[MC_MAXPATHLEN];
1576         struct stat s;
1577
1578         g_snprintf (fullname, sizeof (fullname), "%s" PATH_SEP_STR "%s", dirname, filename);
1579
1580         if ((stat (fullname, &s) == 0) && S_ISREG (s.st_mode) && !S_ISDIR (s.st_mode)
1581             && is_exe (s.st_mode))
1582         {
1583             int f;
1584
1585             f = open (fullname, O_RDONLY);
1586
1587             if (f >= 0)
1588             {
1589                 size_t len, i;
1590                 extfs_plugin_info_t info;
1591                 gboolean found = FALSE;
1592
1593                 close (f);
1594
1595                 /* Handle those with a trailing '+', those flag that the
1596                  * file system does not require an archive to work
1597                  */
1598                 len = strlen (filename);
1599                 info.need_archive = (filename[len - 1] != '+');
1600                 info.path = g_strconcat (dirname, PATH_SEP_STR, (char *) NULL);
1601                 info.prefix = g_strdup (filename);
1602
1603                 /* prepare to compare file names without trailing '+' */
1604                 if (!info.need_archive)
1605                     info.prefix[len - 1] = '\0';
1606
1607                 /* don't overload already found plugin */
1608                 for (i = 0; i < extfs_plugins->len; i++)
1609                 {
1610                     extfs_plugin_info_t *p;
1611
1612                     p = &g_array_index (extfs_plugins, extfs_plugin_info_t, i);
1613
1614                     /* 2 files with same names cannot be in a directory */
1615                     if ((strcmp (info.path, p->path) != 0)
1616                         && (strcmp (info.prefix, p->prefix) == 0))
1617                     {
1618                         found = TRUE;
1619                         break;
1620                     }
1621                 }
1622
1623                 if (found)
1624                 {
1625                     g_free (info.path);
1626                     g_free (info.prefix);
1627                 }
1628                 else
1629                 {
1630                     /* restore file name */
1631                     if (!info.need_archive)
1632                         info.prefix[len - 1] = '+';
1633                     g_array_append_val (extfs_plugins, info);
1634                 }
1635             }
1636         }
1637     }
1638
1639     g_dir_close (dir);
1640     g_free (dirname);
1641
1642     return TRUE;
1643 }
1644
1645 /* --------------------------------------------------------------------------------------------- */
1646
1647 static int
1648 extfs_init (struct vfs_class *me)
1649 {
1650     gboolean d1, d2;
1651
1652     (void) me;
1653
1654     /* 1st: scan user directory */
1655     d1 = extfs_get_plugins (mc_config_get_data_path (), TRUE);  /* silent about user dir */
1656     /* 2nd: scan system dir */
1657     d2 = extfs_get_plugins (LIBEXECDIR, d1);
1658
1659     return (d1 || d2 ? 1 : 0);
1660 }
1661
1662 /* --------------------------------------------------------------------------------------------- */
1663
1664 static void
1665 extfs_done (struct vfs_class *me)
1666 {
1667     size_t i;
1668
1669     while (VFS_SUBCLASS (me)->supers != NULL)
1670         me->free ((vfsid) VFS_SUBCLASS (me)->supers->data);
1671
1672     if (extfs_plugins == NULL)
1673         return;
1674
1675     for (i = 0; i < extfs_plugins->len; i++)
1676     {
1677         extfs_plugin_info_t *info;
1678
1679         info = &g_array_index (extfs_plugins, extfs_plugin_info_t, i);
1680         g_free (info->path);
1681         g_free (info->prefix);
1682     }
1683
1684     g_array_free (extfs_plugins, TRUE);
1685 }
1686
1687 /* --------------------------------------------------------------------------------------------- */
1688
1689 static int
1690 extfs_setctl (const vfs_path_t * vpath, int ctlop, void *arg)
1691 {
1692     (void) arg;
1693
1694     if (ctlop == VFS_SETCTL_RUN)
1695     {
1696         extfs_run (vpath);
1697         return 1;
1698     }
1699     return 0;
1700 }
1701
1702 /* --------------------------------------------------------------------------------------------- */
1703 /*** public functions ****************************************************************************/
1704 /* --------------------------------------------------------------------------------------------- */
1705
1706 void
1707 vfs_init_extfs (void)
1708 {
1709     vfs_init_subclass (&extfs_subclass, "extfs", VFSF_UNKNOWN, NULL);
1710     vfs_extfs_ops->init = extfs_init;
1711     vfs_extfs_ops->done = extfs_done;
1712     vfs_extfs_ops->fill_names = extfs_fill_names;
1713     vfs_extfs_ops->which = extfs_which;
1714     vfs_extfs_ops->open = extfs_open;
1715     vfs_extfs_ops->close = extfs_close;
1716     vfs_extfs_ops->read = extfs_read;
1717     vfs_extfs_ops->write = extfs_write;
1718     vfs_extfs_ops->opendir = extfs_opendir;
1719     vfs_extfs_ops->readdir = extfs_readdir;
1720     vfs_extfs_ops->closedir = extfs_closedir;
1721     vfs_extfs_ops->stat = extfs_stat;
1722     vfs_extfs_ops->lstat = extfs_lstat;
1723     vfs_extfs_ops->fstat = extfs_fstat;
1724     vfs_extfs_ops->chmod = extfs_chmod;
1725     vfs_extfs_ops->chown = extfs_chown;
1726     vfs_extfs_ops->readlink = extfs_readlink;
1727     vfs_extfs_ops->unlink = extfs_unlink;
1728     vfs_extfs_ops->chdir = extfs_chdir;
1729     vfs_extfs_ops->ferrno = extfs_errno;
1730     vfs_extfs_ops->lseek = extfs_lseek;
1731     vfs_extfs_ops->getid = extfs_getid;
1732     vfs_extfs_ops->getlocalcopy = extfs_getlocalcopy;
1733     vfs_extfs_ops->ungetlocalcopy = extfs_ungetlocalcopy;
1734     vfs_extfs_ops->mkdir = extfs_mkdir;
1735     vfs_extfs_ops->rmdir = extfs_rmdir;
1736     vfs_extfs_ops->setctl = extfs_setctl;
1737     extfs_subclass.free_inode = extfs_free_inode;
1738     extfs_subclass.free_archive = extfs_free_archive;
1739     vfs_register_class (vfs_extfs_ops);
1740 }
1741
1742 /* --------------------------------------------------------------------------------------------- */