src/vfs/extfs/extfs.c

src/vfs/extfs/extfs.c
/* */
This source file includes following definitions.
extfs_super_new
extfs_entry_new
extfs_fill_name
extfs_cmp_archive
extfs_generate_entry
extfs_find_entry_int
extfs_find_entry
extfs_fill_names
extfs_free_inode
extfs_free_archive
extfs_skip_leading_dotslash
extfs_add_file
extfs_open_archive
extfs_read_archive
extfs_which
extfs_open_and_read_archive
extfs_get_path
extfs_get_path_from_entry
extfs_resolve_symlinks_int
extfs_resolve_symlinks
extfs_get_archive_name
extfs_cmd
extfs_run
extfs_open
extfs_read
extfs_close
extfs_errno
extfs_opendir
extfs_readdir
extfs_closedir
extfs_stat_move
extfs_internal_stat
extfs_stat
extfs_lstat
extfs_fstat
extfs_readlink
extfs_write
extfs_unlink
extfs_mkdir
extfs_rmdir
extfs_chdir
extfs_lseek
extfs_getid
extfs_getlocalcopy
extfs_ungetlocalcopy
extfs_get_plugins
extfs_init
extfs_done
extfs_setctl
vfs_init_extfs
   1 /*
   2    Virtual File System: External file system.
   3 
   4    Copyright (C) 1995-2025
   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 <https://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)                                                                               \
  74     do                                                                                             \
  75     {                                                                                              \
  76         my_errno = x;                                                                              \
  77         return y;                                                                                  \
  78     }                                                                                              \
  79     while (0)
  80 
  81 #define RECORDSIZE     512
  82 
  83 #define EXTFS_SUPER(a) ((struct extfs_super_t *) (a))
  84 
  85 /*** file scope type declarations ****************************************************************/
  86 
  87 struct extfs_super_t
  88 {
  89     struct vfs_s_super base;  // base class
  90 
  91     int fstype;
  92     char *local_name;
  93     struct stat local_stat;
  94     dev_t rdev;
  95 };
  96 
  97 typedef struct
  98 {
  99     char *path;
 100     char *prefix;
 101     gboolean need_archive;
 102 } extfs_plugin_info_t;
 103 
 104 /*** forward declarations (file scope functions) *************************************************/
 105 
 106 static struct vfs_s_entry *extfs_resolve_symlinks_int (struct vfs_s_entry *entry, GSList *list);
 107 
 108 /*** file scope variables ************************************************************************/
 109 
 110 static GArray *extfs_plugins = NULL;
 111 
 112 static gboolean errloop;
 113 static gboolean notadir;
 114 
 115 static struct vfs_s_subclass extfs_subclass;
 116 static struct vfs_class *vfs_extfs_ops = VFS_CLASS (&extfs_subclass);
 117 
 118 static int my_errno = 0;
 119 
 120 /* --------------------------------------------------------------------------------------------- */
 121 /*** file scope functions ************************************************************************/
 122 /* --------------------------------------------------------------------------------------------- */
 123 
 124 static struct extfs_super_t *
 125 extfs_super_new (struct vfs_class *me, const char *name, const vfs_path_t *local_name_vpath,
     /*   */
 126                  int fstype)
 127 {
 128     struct extfs_super_t *super;
 129     struct vfs_s_super *vsuper;
 130 
 131     super = g_new0 (struct extfs_super_t, 1);
 132     vsuper = VFS_SUPER (super);
 133 
 134     vsuper->me = me;
 135     vsuper->name = g_strdup (name);
 136 
 137     super->fstype = fstype;
 138 
 139     if (local_name_vpath != NULL)
 140     {
 141         super->local_name = g_strdup (vfs_path_get_last_path_str (local_name_vpath));
 142         mc_stat (local_name_vpath, &super->local_stat);
 143     }
 144 
 145     VFS_SUBCLASS (me)->supers = g_list_prepend (VFS_SUBCLASS (me)->supers, super);
 146 
 147     return super;
 148 }
 149 
 150 /* --------------------------------------------------------------------------------------------- */
 151 
 152 /* unlike vfs_s_new_entry(), inode->ent is kept */
 153 static struct vfs_s_entry *
 154 extfs_entry_new (struct vfs_class *me, const char *name, struct vfs_s_inode *inode)
     /*   */
 155 {
 156     struct vfs_s_entry *entry;
 157 
 158     (void) me;
 159 
 160     entry = g_new0 (struct vfs_s_entry, 1);
 161 
 162     entry->name = g_strdup (name);
 163     entry->ino = inode;
 164 
 165     return entry;
 166 }
 167 
 168 /* --------------------------------------------------------------------------------------------- */
 169 
 170 static void
 171 extfs_fill_name (void *data, void *user_data)
     /*   */
 172 {
 173     struct vfs_s_super *a = VFS_SUPER (data);
 174     fill_names_f func = (fill_names_f) user_data;
 175     extfs_plugin_info_t *info;
 176     char *name;
 177 
 178     info = &g_array_index (extfs_plugins, extfs_plugin_info_t, EXTFS_SUPER (a)->fstype);
 179     name = g_strconcat (a->name != NULL ? a->name : "", PATH_SEP_STR, info->prefix,
 180                         VFS_PATH_URL_DELIMITER, (char *) NULL);
 181     func (name);
 182     g_free (name);
 183 }
 184 
 185 /* --------------------------------------------------------------------------------------------- */
 186 
 187 static gint
 188 extfs_cmp_archive (const void *a, const void *b)
     /*   */
 189 {
 190     const struct vfs_s_super *ar = (const struct vfs_s_super *) a;
 191     const char *archive_name = (const char *) b;
 192 
 193     return (ar->name != NULL && strcmp (ar->name, archive_name) == 0) ? 0 : 1;
 194 }
 195 
 196 /* --------------------------------------------------------------------------------------------- */
 197 
 198 static struct vfs_s_entry *
 199 extfs_generate_entry (struct extfs_super_t *archive, const char *name, struct vfs_s_inode *parent,
     /*   */
 200                       mode_t mode)
 201 {
 202     struct vfs_class *me = VFS_SUPER (archive)->me;
 203     struct stat st;
 204     mode_t myumask;
 205     struct vfs_s_inode *inode;
 206     struct vfs_s_entry *entry;
 207 
 208     memset (&st, 0, sizeof (st));
 209     st.st_ino = VFS_SUPER (archive)->ino_usage++;
 210     st.st_dev = archive->rdev;
 211     myumask = umask (022);
 212     umask (myumask);
 213     st.st_mode = mode & ~myumask;
 214     st.st_uid = getuid ();
 215     st.st_gid = getgid ();
 216     st.st_mtime = time (NULL);
 217     st.st_atime = st.st_mtime;
 218     st.st_ctime = st.st_mtime;
 219     st.st_nlink = 1;
 220 
 221     inode = vfs_s_new_inode (me, VFS_SUPER (archive), &st);
 222     entry = vfs_s_new_entry (me, name, inode);
 223     if (parent != NULL)
 224         vfs_s_insert_entry (me, parent, entry);
 225 
 226     return entry;
 227 }
 228 
 229 /* --------------------------------------------------------------------------------------------- */
 230 
 231 static struct vfs_s_entry *
 232 extfs_find_entry_int (struct vfs_s_inode *dir, const char *name, GSList *list, int flags)
     /*   */
 233 {
 234     struct vfs_s_entry *pent, *pdir;
 235     const char *p, *name_end;
 236     char *q;
 237     char c = PATH_SEP;
 238     struct extfs_super_t *super;
 239 
 240     if (g_path_is_absolute (name))
 241     {
 242         // Handle absolute paths
 243         name = g_path_skip_root (name);
 244         dir = dir->super->root;
 245     }
 246 
 247     super = EXTFS_SUPER (dir->super);
 248     pent = dir->ent;
 249     p = name;
 250     name_end = name + strlen (name);
 251 
 252     while ((pent != NULL) && (c != '\0') && (*p != '\0'))
 253     {
 254         q = strchr (p, PATH_SEP);
 255         if (q == NULL)
 256             q = (char *) name_end;
 257 
 258         c = *q;
 259         *q = '\0';
 260 
 261         if (DIR_IS_DOTDOT (p))
 262             pent = pent->dir != NULL ? pent->dir->ent : NULL;
 263         else
 264         {
 265             GList *pl;
 266 
 267             pent = extfs_resolve_symlinks_int (pent, list);
 268             if (pent == NULL)
 269             {
 270                 *q = c;
 271                 return NULL;
 272             }
 273 
 274             if (!S_ISDIR (pent->ino->st.st_mode))
 275             {
 276                 *q = c;
 277                 notadir = TRUE;
 278                 return NULL;
 279             }
 280 
 281             pdir = pent;
 282             pl = g_queue_find_custom (pent->ino->subdir, p, vfs_s_entry_compare);
 283             pent = pl != NULL ? VFS_ENTRY (pl->data) : NULL;
 284             if (pent != NULL && q + 1 > name_end)
 285             {
 286                 // Hack: I keep the original semanthic unless q+1 would break in the strchr
 287                 *q = c;
 288                 notadir = !S_ISDIR (pent->ino->st.st_mode);
 289                 return pent;
 290             }
 291 
 292             // When we load archive, we create automagically non-existent directories
 293             if (pent == NULL && (flags & FL_MKDIR) != 0)
 294                 pent = extfs_generate_entry (super, p, pdir->ino, S_IFDIR | 0777);
 295             if (pent == NULL && (flags & FL_MKFILE) != 0)
 296                 pent = extfs_generate_entry (super, p, pdir->ino, S_IFREG | 0666);
 297         }
 298 
 299         // Next iteration
 300         *q = c;
 301         if (c != '\0')
 302             p = q + 1;
 303     }
 304     if (pent == NULL)
 305         my_errno = ENOENT;
 306     return pent;
 307 }
 308 
 309 /* --------------------------------------------------------------------------------------------- */
 310 
 311 static struct vfs_s_entry *
 312 extfs_find_entry (struct vfs_s_inode *dir, const char *name, int flags)
     /*   */
 313 {
 314     struct vfs_s_entry *res;
 315 
 316     errloop = FALSE;
 317     notadir = FALSE;
 318 
 319     res = extfs_find_entry_int (dir, name, NULL, flags);
 320     if (res == NULL)
 321     {
 322         if (errloop)
 323             my_errno = ELOOP;
 324         else if (notadir)
 325             my_errno = ENOTDIR;
 326     }
 327     return res;
 328 }
 329 
 330 /* --------------------------------------------------------------------------------------------- */
 331 
 332 static void
 333 extfs_fill_names (struct vfs_class *me, fill_names_f func)
     /*   */
 334 {
 335     g_list_foreach (VFS_SUBCLASS (me)->supers, extfs_fill_name, func);
 336 }
 337 
 338 /* --------------------------------------------------------------------------------------------- */
 339 
 340 /* Create this function because VFSF_USETMP flag is not used in extfs */
 341 static void
 342 extfs_free_inode (struct vfs_class *me, struct vfs_s_inode *ino)
     /*   */
 343 {
 344     (void) me;
 345 
 346     if (ino->localname != NULL)
 347     {
 348         unlink (ino->localname);
 349         MC_PTR_FREE (ino->localname);
 350     }
 351 }
 352 
 353 /* --------------------------------------------------------------------------------------------- */
 354 
 355 static void
 356 extfs_free_archive (struct vfs_class *me, struct vfs_s_super *psup)
     /*   */
 357 {
 358     struct extfs_super_t *archive = EXTFS_SUPER (psup);
 359 
 360     (void) me;
 361 
 362     if (archive->local_name != NULL)
 363     {
 364         struct stat my;
 365         vfs_path_t *local_name_vpath, *name_vpath;
 366 
 367         local_name_vpath = vfs_path_from_str (archive->local_name);
 368         name_vpath = vfs_path_from_str (psup->name);
 369         mc_stat (local_name_vpath, &my);
 370         mc_ungetlocalcopy (name_vpath, local_name_vpath,
 371                            archive->local_stat.st_mtime != my.st_mtime);
 372         vfs_path_free (local_name_vpath, TRUE);
 373         vfs_path_free (name_vpath, TRUE);
 374         g_free (archive->local_name);
 375     }
 376 }
 377 
 378 /* --------------------------------------------------------------------------------------------- */
 379 
 380 static inline char *
 381 extfs_skip_leading_dotslash (char *s)
     /*   */
 382 {
 383     /* Skip leading "./" (if present).
 384      * Some programs don't understand it:
 385      *
 386      * $ zip file.zip ./-file2.txt file1.txt
 387      *   adding: -file2.txt (stored 0%)
 388      *   adding: file1.txt (stored 0%)
 389      * $ /usr/lib/mc/extfs.d/uzip copyout file.zip ./-file2.txt ./tmp-file2.txt
 390      * caution: filename not matched:  ./-file2.txt
 391      */
 392     if (s[0] == '.' && s[1] == PATH_SEP)
 393         s += 2;
 394 
 395     return s;
 396 }
 397 
 398 /* --------------------------------------------------------------------------------------------- */
 399 
 400 static int
 401 extfs_add_file (struct extfs_super_t *archive, const char *file_name)
     /*   */
 402 {
 403     struct vfs_s_super *super = VFS_SUPER (archive);
 404     struct stat hstat;
 405     char *current_file_name = NULL, *current_link_name = NULL;
 406     int ret = 0;
 407 
 408     if (vfs_parse_ls_lga (file_name, &hstat, &current_file_name, &current_link_name, NULL))
 409     {
 410         char *cfn = current_file_name;
 411 
 412         if (*cfn != '\0')
 413         {
 414             struct vfs_s_entry *entry;
 415             struct vfs_s_entry *pent = NULL;
 416             struct vfs_s_inode *inode;
 417             char *p, *q;
 418 
 419             cfn = extfs_skip_leading_dotslash (cfn);
 420             if (IS_PATH_SEP (*cfn))
 421                 cfn++;
 422             p = strchr (cfn, '\0');
 423             if (p != cfn && IS_PATH_SEP (p[-1]))
 424                 p[-1] = '\0';
 425             p = strrchr (cfn, PATH_SEP);
 426             if (p == NULL)
 427             {
 428                 p = cfn;
 429                 q = strchr (cfn, '\0');
 430             }
 431             else
 432             {
 433                 *(p++) = '\0';
 434                 q = cfn;
 435             }
 436 
 437             if (*q != '\0')
 438             {
 439                 pent = extfs_find_entry (super->root, q, FL_MKDIR);
 440                 if (pent == NULL)
 441                 {
 442                     ret = -1;
 443                     goto done;
 444                 }
 445             }
 446 
 447             if (pent != NULL)
 448             {
 449                 entry = extfs_entry_new (super->me, p, pent->ino);
 450                 entry->dir = pent->ino;
 451                 g_queue_push_tail (pent->ino->subdir, entry);
 452             }
 453             else
 454             {
 455                 entry = extfs_entry_new (super->me, p, super->root);
 456                 entry->dir = super->root;
 457                 g_queue_push_tail (super->root->subdir, entry);
 458             }
 459 
 460             if (!S_ISLNK (hstat.st_mode) && (current_link_name != NULL))
 461             {
 462                 pent = extfs_find_entry (super->root, current_link_name, FL_NONE);
 463                 if (pent == NULL)
 464                 {
 465                     ret = -1;
 466                     goto done;
 467                 }
 468 
 469                 pent->ino->st.st_nlink++;
 470                 entry->ino = pent->ino;
 471             }
 472             else
 473             {
 474                 struct stat st;
 475 
 476                 memset (&st, 0, sizeof (st));
 477                 st.st_ino = super->ino_usage++;
 478                 st.st_nlink = 1;
 479                 st.st_dev = archive->rdev;
 480                 st.st_mode = hstat.st_mode;
 481 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 482                 st.st_rdev = hstat.st_rdev;
 483 #endif
 484                 st.st_uid = hstat.st_uid;
 485                 st.st_gid = hstat.st_gid;
 486                 st.st_size = hstat.st_size;
 487                 st.st_mtime = hstat.st_mtime;
 488                 st.st_atime = hstat.st_atime;
 489                 st.st_ctime = hstat.st_ctime;
 490 
 491                 if (current_link_name == NULL && S_ISLNK (hstat.st_mode))
 492                     st.st_mode &= ~S_IFLNK;  // You *DON'T* want to do this always
 493 
 494                 inode = vfs_s_new_inode (super->me, super, &st);
 495                 inode->ent = entry;
 496                 entry->ino = inode;
 497 
 498                 if (current_link_name != NULL && S_ISLNK (hstat.st_mode))
 499                 {
 500                     inode->linkname = current_link_name;
 501                     current_link_name = NULL;
 502                 }
 503             }
 504         }
 505 
 506     done:
 507         g_free (current_file_name);
 508         g_free (current_link_name);
 509     }
 510 
 511     return ret;
 512 }
 513 
 514 /* --------------------------------------------------------------------------------------------- */
 515 
 516 static mc_pipe_t *
 517 extfs_open_archive (int fstype, const char *name, struct extfs_super_t **pparc, GError **error)
     /*   */
 518 {
 519     const extfs_plugin_info_t *info;
 520     static dev_t archive_counter = 0;
 521     mc_pipe_t *result = NULL;
 522     mode_t mode;
 523     char *cmd;
 524     struct stat mystat;
 525     struct extfs_super_t *current_archive;
 526     struct vfs_s_entry *root_entry;
 527     char *tmp = NULL;
 528     vfs_path_t *local_name_vpath = NULL;
 529     vfs_path_t *name_vpath;
 530 
 531     memset (&mystat, 0, sizeof (mystat));
 532 
 533     name_vpath = vfs_path_from_str (name);
 534     info = &g_array_index (extfs_plugins, extfs_plugin_info_t, fstype);
 535 
 536     if (info->need_archive)
 537     {
 538         if (mc_stat (name_vpath, &mystat) == -1)
 539         {
 540             mc_propagate_error (error, 0, "%s", unix_error_string (errno));
 541             goto ret;
 542         }
 543 
 544         if (!vfs_file_is_local (name_vpath))
 545         {
 546             local_name_vpath = mc_getlocalcopy (name_vpath);
 547             if (local_name_vpath == NULL)
 548                 goto ret;
 549         }
 550 
 551         tmp = name_quote (vfs_path_get_last_path_str (name_vpath), FALSE);
 552     }
 553 
 554     cmd = g_strconcat (info->path, info->prefix, " list ",
 555                        vfs_path_get_last_path_str (local_name_vpath) != NULL
 556                            ? vfs_path_get_last_path_str (local_name_vpath)
 557                            : tmp,
 558                        (char *) NULL);
 559     g_free (tmp);
 560 
 561     result = mc_popen (cmd, TRUE, TRUE, error);
 562     g_free (cmd);
 563 
 564     if (result == NULL)
 565     {
 566         if (local_name_vpath != NULL)
 567         {
 568             mc_ungetlocalcopy (name_vpath, local_name_vpath, FALSE);
 569             vfs_path_free (local_name_vpath, TRUE);
 570         }
 571         goto ret;
 572     }
 573 
 574     current_archive = extfs_super_new (vfs_extfs_ops, name, local_name_vpath, fstype);
 575     current_archive->rdev = archive_counter++;
 576     vfs_path_free (local_name_vpath, TRUE);
 577 
 578     mode = mystat.st_mode & 07777;
 579     if (mode & 0400)
 580         mode |= 0100;
 581     if (mode & 0040)
 582         mode |= 0010;
 583     if (mode & 0004)
 584         mode |= 0001;
 585     mode |= S_IFDIR;
 586 
 587     root_entry = extfs_generate_entry (current_archive, PATH_SEP_STR, NULL, mode);
 588     root_entry->ino->st.st_uid = mystat.st_uid;
 589     root_entry->ino->st.st_gid = mystat.st_gid;
 590     root_entry->ino->st.st_atime = mystat.st_atime;
 591     root_entry->ino->st.st_ctime = mystat.st_ctime;
 592     root_entry->ino->st.st_mtime = mystat.st_mtime;
 593     root_entry->ino->ent = root_entry;
 594     VFS_SUPER (current_archive)->root = root_entry->ino;
 595 
 596     *pparc = current_archive;
 597 
 598 ret:
 599     vfs_path_free (name_vpath, TRUE);
 600     return result;
 601 }
 602 
 603 /* --------------------------------------------------------------------------------------------- */
 604 /**
 605  * Main loop for reading an archive.
 606  * Return 0 on success, -1 on error.
 607  */
 608 
 609 static int
 610 extfs_read_archive (mc_pipe_t *pip, struct extfs_super_t *archive, GError **error)
     /*   */
 611 {
 612     int ret = 0;
 613     GString *buffer;
 614     GString *err_msg = NULL;
 615     GString *remain_file_name = NULL;
 616 
 617     while (ret != -1)
 618     {
 619         // init buffers before call of mc_pread()
 620         pip->out.len = MC_PIPE_BUFSIZE;
 621         pip->err.len = MC_PIPE_BUFSIZE;
 622 
 623         mc_pread (pip, error);
 624 
 625         if (*error != NULL)
 626             return (-1);
 627 
 628         if (pip->err.len > 0)
 629         {
 630             // join errors/warnings
 631             if (err_msg == NULL)
 632                 err_msg = g_string_new_len (pip->err.buf, pip->err.len);
 633             else
 634             {
 635                 if (err_msg->str[err_msg->len - 1] != '\n')
 636                     g_string_append_c (err_msg, '\n');
 637                 g_string_append_len (err_msg, pip->err.buf, pip->err.len);
 638             }
 639         }
 640 
 641         if (pip->out.len == MC_PIPE_STREAM_EOF)
 642             break;
 643 
 644         if (pip->out.len == 0)
 645             continue;
 646 
 647         if (pip->out.len == MC_PIPE_ERROR_READ)
 648             return (-1);
 649 
 650         while (ret != -1 && (buffer = mc_pstream_get_string (&pip->out)) != NULL)
 651         {
 652             // handle a \n-separated file list
 653 
 654             if (buffer->str[buffer->len - 1] == '\n')
 655             {
 656                 // entire file name or last chunk
 657 
 658                 g_string_truncate (buffer, buffer->len - 1);
 659 
 660                 // join filename chunks
 661                 if (remain_file_name != NULL)
 662                 {
 663                     g_string_append_len (remain_file_name, buffer->str, buffer->len);
 664                     g_string_free (buffer, TRUE);
 665                     buffer = remain_file_name;
 666                     remain_file_name = NULL;
 667                 }
 668             }
 669             else
 670             {
 671                 // first or middle chunk of file name
 672 
 673                 if (remain_file_name == NULL)
 674                     remain_file_name = buffer;
 675                 else
 676                 {
 677                     g_string_append_len (remain_file_name, buffer->str, buffer->len);
 678                     g_string_free (buffer, TRUE);
 679                 }
 680 
 681                 continue;
 682             }
 683 
 684             ret = extfs_add_file (archive, buffer->str);
 685 
 686             g_string_free (buffer, TRUE);
 687         }
 688     }
 689 
 690     if (remain_file_name != NULL)
 691         g_string_free (remain_file_name, TRUE);
 692 
 693     if (err_msg != NULL)
 694     {
 695         if (*error == NULL)
 696             mc_propagate_error (error, 0, "%s", err_msg->str);
 697 
 698         g_string_free (err_msg, TRUE);
 699     }
 700     else if (ret == -1)
 701         mc_propagate_error (error, 0, "%s", _ ("Inconsistent archive"));
 702 
 703     return ret;
 704 }
 705 
 706 /* --------------------------------------------------------------------------------------------- */
 707 
 708 static int
 709 extfs_which (struct vfs_class *me, const char *path)
     /*   */
 710 {
 711     size_t path_len;
 712     size_t i;
 713 
 714     (void) me;
 715 
 716     path_len = strlen (path);
 717 
 718     for (i = 0; i < extfs_plugins->len; i++)
 719     {
 720         extfs_plugin_info_t *info;
 721 
 722         info = &g_array_index (extfs_plugins, extfs_plugin_info_t, i);
 723 
 724         if ((strncmp (path, info->prefix, path_len) == 0)
 725             && ((info->prefix[path_len] == '\0') || (info->prefix[path_len] == '+')))
 726             return i;
 727     }
 728     return -1;
 729 }
 730 
 731 /* --------------------------------------------------------------------------------------------- */
 732 
 733 static int
 734 extfs_open_and_read_archive (int fstype, const char *name, struct extfs_super_t **archive)
     /*   */
 735 {
 736     int result = -1;
 737     struct extfs_super_t *a;
 738     mc_pipe_t *pip;
 739     GError *error = NULL;
 740 
 741     pip = extfs_open_archive (fstype, name, archive, &error);
 742 
 743     a = *archive;
 744 
 745     if (pip == NULL)
 746     {
 747         const extfs_plugin_info_t *info;
 748 
 749         info = &g_array_index (extfs_plugins, extfs_plugin_info_t, fstype);
 750         if (error == NULL)
 751             message (D_ERROR, MSG_ERROR, _ ("Cannot open %s archive\n%s"), info->prefix, name);
 752         else
 753         {
 754             message (D_ERROR, MSG_ERROR, _ ("Cannot open %s archive\n%s:\n%s"), info->prefix, name,
 755                      error->message);
 756             g_error_free (error);
 757         }
 758     }
 759     else
 760     {
 761         result = extfs_read_archive (pip, a, &error);
 762 
 763         if (result != 0)
 764             VFS_SUPER (a)->me->free (VFS_SUPER (a));
 765 
 766         if (error != NULL)
 767         {
 768             message (D_ERROR, MSG_ERROR, _ ("EXTFS virtual file system:\n%s"), error->message);
 769             g_error_free (error);
 770         }
 771 
 772         mc_pclose (pip, NULL);
 773     }
 774 
 775     return result;
 776 }
 777 
 778 /* --------------------------------------------------------------------------------------------- */
 779 /**
 780  * Dissect the path and create corresponding superblock.
 781  */
 782 static const char *
 783 extfs_get_path (const vfs_path_t *vpath, struct extfs_super_t **archive, int flags)
     /*   */
 784 {
 785     char *archive_name;
 786     int result = -1;
 787     GList *parc;
 788     int fstype;
 789     const vfs_path_element_t *path_element;
 790     struct extfs_super_t *a = NULL;
 791 
 792     path_element = vfs_path_get_by_index (vpath, -1);
 793 
 794     fstype = extfs_which (path_element->class, path_element->vfs_prefix);
 795     if (fstype == -1)
 796         return NULL;
 797 
 798     archive_name = vfs_path_to_str_elements_count (vpath, -1);
 799 
 800     // All filesystems should have some local archive, at least it can be PATH_SEP ('/')
 801     parc = g_list_find_custom (extfs_subclass.supers, archive_name, extfs_cmp_archive);
 802     if (parc != NULL)
 803     {
 804         a = EXTFS_SUPER (parc->data);
 805         vfs_stamp (vfs_extfs_ops, (vfsid) a);
 806         g_free (archive_name);
 807     }
 808     else
 809     {
 810         if ((flags & FL_NO_OPEN) == 0)
 811             result = extfs_open_and_read_archive (fstype, archive_name, &a);
 812 
 813         g_free (archive_name);
 814 
 815         if (result == -1)
 816         {
 817             path_element->class->verrno = EIO;
 818             return NULL;
 819         }
 820     }
 821 
 822     *archive = a;
 823     return path_element->path;
 824 }
 825 
 826 /* --------------------------------------------------------------------------------------------- */
 827 /* Return allocated path (without leading slash) inside the archive  */
 828 
 829 static char *
 830 extfs_get_path_from_entry (const struct vfs_s_entry *entry)
     /*   */
 831 {
 832     const struct vfs_s_entry *e;
 833     GString *localpath;
 834 
 835     localpath = g_string_new ("");
 836 
 837     for (e = entry; e->dir != NULL; e = e->dir->ent)
 838     {
 839         g_string_prepend (localpath, e->name);
 840         if (e->dir->ent->dir != NULL)
 841             g_string_prepend_c (localpath, PATH_SEP);
 842     }
 843 
 844     return g_string_free (localpath, FALSE);
 845 }
 846 
 847 /* --------------------------------------------------------------------------------------------- */
 848 
 849 static struct vfs_s_entry *
 850 extfs_resolve_symlinks_int (struct vfs_s_entry *entry, GSList *list)
     /*   */
 851 {
 852     struct vfs_s_entry *pent = NULL;
 853 
 854     if (!S_ISLNK (entry->ino->st.st_mode))
 855         return entry;
 856 
 857     if (g_slist_find (list, entry) != NULL)
 858     {
 859         // Here we protect us against symlink looping
 860         errloop = TRUE;
 861     }
 862     else
 863     {
 864         GSList *looping;
 865 
 866         looping = g_slist_prepend (list, entry);
 867         pent = extfs_find_entry_int (entry->dir, entry->ino->linkname, looping, FL_NONE);
 868         looping = g_slist_delete_link (looping, looping);
 869 
 870         if (pent == NULL)
 871             my_errno = ENOENT;
 872     }
 873 
 874     return pent;
 875 }
 876 
 877 /* --------------------------------------------------------------------------------------------- */
 878 
 879 static struct vfs_s_entry *
 880 extfs_resolve_symlinks (struct vfs_s_entry *entry)
     /*   */
 881 {
 882     struct vfs_s_entry *res;
 883 
 884     errloop = FALSE;
 885     notadir = FALSE;
 886     res = extfs_resolve_symlinks_int (entry, NULL);
 887     if (res == NULL)
 888     {
 889         if (errloop)
 890             my_errno = ELOOP;
 891         else if (notadir)
 892             my_errno = ENOTDIR;
 893     }
 894     return res;
 895 }
 896 
 897 /* --------------------------------------------------------------------------------------------- */
 898 
 899 static char *
 900 extfs_get_archive_name (const struct extfs_super_t *archive)
     /*   */
 901 {
 902     const char *archive_name;
 903 
 904     if (archive->local_name != NULL)
 905         archive_name = archive->local_name;
 906     else
 907         archive_name = CONST_VFS_SUPER (archive)->name;
 908 
 909     if (archive_name == NULL || *archive_name == '\0')
 910         return g_strdup ("no_archive_name");
 911     else
 912     {
 913         char *ret_str;
 914         vfs_path_t *vpath;
 915         const char *path;
 916 
 917         vpath = vfs_path_from_str (archive_name);
 918         path = vfs_path_get_last_path_str (vpath);
 919         ret_str = g_strdup (path);
 920         vfs_path_free (vpath, TRUE);
 921         return ret_str;
 922     }
 923 }
 924 
 925 /* --------------------------------------------------------------------------------------------- */
 926 /** Don't pass localname as NULL */
 927 
 928 static int
 929 extfs_cmd (const char *str_extfs_cmd, const struct extfs_super_t *archive,
     /*   */
 930            const struct vfs_s_entry *entry, const char *localname)
 931 {
 932     char *file;
 933     char *quoted_file;
 934     char *archive_name, *quoted_archive_name;
 935     const extfs_plugin_info_t *info;
 936     char *cmd = NULL;
 937     int retval = 0;
 938     GError *error = NULL;
 939     mc_pipe_t *pip;
 940 
 941     file = extfs_get_path_from_entry (entry);
 942     quoted_file = name_quote (file, FALSE);
 943     g_free (file);
 944 
 945     if (quoted_file == NULL)
 946     {
 947         message (D_ERROR, MSG_ERROR, _ ("EXTFS virtual file system:\nwrong file name"));
 948         return (-1);
 949     }
 950 
 951     // Skip leading "./" (if present) added in name_quote()
 952     file = extfs_skip_leading_dotslash (quoted_file);
 953 
 954     archive_name = extfs_get_archive_name (archive);
 955     quoted_archive_name = name_quote (archive_name, FALSE);
 956     g_free (archive_name);
 957 
 958     if (quoted_archive_name == NULL)
 959     {
 960         message (D_ERROR, MSG_ERROR, _ ("EXTFS virtual file system:\nwrong archive name"));
 961         return (-1);
 962     }
 963 
 964     info = &g_array_index (extfs_plugins, extfs_plugin_info_t, archive->fstype);
 965 
 966     if (localname == NULL || *localname == '\0')
 967         cmd = g_strconcat (info->path, info->prefix, str_extfs_cmd, quoted_archive_name, " ", file,
 968                            (char *) NULL);
 969     else
 970     {
 971         char *quoted_localname;
 972 
 973         quoted_localname = name_quote (localname, FALSE);
 974         cmd = g_strconcat (info->path, info->prefix, str_extfs_cmd, quoted_archive_name, " ", file,
 975                            " ", quoted_localname, (char *) NULL);
 976         g_free (quoted_localname);
 977     }
 978 
 979     g_free (quoted_file);
 980     g_free (quoted_archive_name);
 981 
 982     if (cmd == NULL)
 983     {
 984         message (D_ERROR, MSG_ERROR, _ ("EXTFS virtual file system:\ncannot build command"));
 985         return (-1);
 986     }
 987 
 988     // don't read stdout
 989     pip = mc_popen (cmd, FALSE, TRUE, &error);
 990     g_free (cmd);
 991 
 992     if (pip == NULL)
 993     {
 994         message (D_ERROR, MSG_ERROR, _ ("EXTFS virtual file system:\n%s"), error->message);
 995         g_error_free (error);
 996         return (-1);
 997     }
 998 
 999     pip->err.null_term = TRUE;
1000 
1001     mc_pread (pip, &error);
1002     if (error != NULL)
1003     {
1004         message (D_ERROR, MSG_ERROR, _ ("EXTFS virtual file system:\n%s"), error->message);
1005         g_error_free (error);
1006         retval = -1;
1007     }
1008     else if (pip->err.len > 0)
1009         message (D_ERROR, MSG_ERROR, _ ("EXTFS virtual file system:\n%s"), pip->err.buf);
1010 
1011     mc_pclose (pip, NULL);
1012 
1013     return retval;
1014 }
1015 
1016 /* --------------------------------------------------------------------------------------------- */
1017 
1018 static void
1019 extfs_run (const vfs_path_t *vpath)
     /*   */
1020 {
1021     struct extfs_super_t *archive = NULL;
1022     const char *p;
1023     char *q, *archive_name, *quoted_archive_name;
1024     char *cmd;
1025     const extfs_plugin_info_t *info;
1026 
1027     p = extfs_get_path (vpath, &archive, FL_NONE);
1028     if (p == NULL)
1029         return;
1030     q = name_quote (p, FALSE);
1031 
1032     archive_name = extfs_get_archive_name (archive);
1033     quoted_archive_name = name_quote (archive_name, FALSE);
1034     g_free (archive_name);
1035     info = &g_array_index (extfs_plugins, extfs_plugin_info_t, archive->fstype);
1036     cmd =
1037         g_strconcat (info->path, info->prefix, " run ", quoted_archive_name, " ", q, (char *) NULL);
1038     g_free (quoted_archive_name);
1039     g_free (q);
1040     shell_execute (cmd, 0);
1041     g_free (cmd);
1042 }
1043 
1044 /* --------------------------------------------------------------------------------------------- */
1045 
1046 static void *
1047 extfs_open (const vfs_path_t *vpath, int flags, mode_t mode)
     /*   */
1048 {
1049     vfs_file_handler_t *extfs_info;
1050     struct extfs_super_t *archive = NULL;
1051     const char *q;
1052     struct vfs_s_entry *entry;
1053     int local_handle;
1054     gboolean created = FALSE;
1055 
1056     q = extfs_get_path (vpath, &archive, FL_NONE);
1057     if (q == NULL)
1058         return NULL;
1059     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1060     if ((entry == NULL) && ((flags & O_CREAT) != 0))
1061     {
1062         // Create new entry
1063         entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_MKFILE);
1064         created = (entry != NULL);
1065     }
1066 
1067     if (entry == NULL)
1068         return NULL;
1069     entry = extfs_resolve_symlinks (entry);
1070     if (entry == NULL)
1071         return NULL;
1072 
1073     if (S_ISDIR (entry->ino->st.st_mode))
1074         ERRNOR (EISDIR, NULL);
1075 
1076     if (entry->ino->localname == NULL)
1077     {
1078         vfs_path_t *local_filename_vpath;
1079         const char *local_filename;
1080 
1081         local_handle = vfs_mkstemps (&local_filename_vpath, "extfs", entry->name);
1082 
1083         if (local_handle == -1)
1084             return NULL;
1085         close (local_handle);
1086         local_filename = vfs_path_get_last_path_str (local_filename_vpath);
1087 
1088         if (!created && ((flags & O_TRUNC) == 0)
1089             && extfs_cmd (" copyout ", archive, entry, local_filename))
1090         {
1091             unlink (local_filename);
1092             vfs_path_free (local_filename_vpath, TRUE);
1093             my_errno = EIO;
1094             return NULL;
1095         }
1096         entry->ino->localname = g_strdup (local_filename);
1097         vfs_path_free (local_filename_vpath, TRUE);
1098     }
1099 
1100     local_handle = open (entry->ino->localname, NO_LINEAR (flags), mode);
1101 
1102     if (local_handle == -1)
1103     {
1104         // file exists(may be). Need to drop O_CREAT flag and truncate file content
1105         flags = ~O_CREAT & (NO_LINEAR (flags) | O_TRUNC);
1106         local_handle = open (entry->ino->localname, flags, mode);
1107     }
1108 
1109     if (local_handle == -1)
1110         ERRNOR (EIO, NULL);
1111 
1112     extfs_info = g_new (vfs_file_handler_t, 1);
1113     vfs_s_init_fh (extfs_info, entry->ino, created);
1114     extfs_info->handle = local_handle;
1115 
1116     // i.e. we had no open files and now we have one
1117     vfs_rmstamp (vfs_extfs_ops, (vfsid) archive);
1118     VFS_SUPER (archive)->fd_usage++;
1119     return extfs_info;
1120 }
1121 
1122 /* --------------------------------------------------------------------------------------------- */
1123 
1124 static ssize_t
1125 extfs_read (void *fh, char *buffer, size_t count)
     /*   */
1126 {
1127     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1128 
1129     return read (file->handle, buffer, count);
1130 }
1131 
1132 /* --------------------------------------------------------------------------------------------- */
1133 
1134 static int
1135 extfs_close (void *fh)
     /*   */
1136 {
1137     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1138     int errno_code = 0;
1139 
1140     close (file->handle);
1141     file->handle = -1;
1142 
1143     // Commit the file if it has changed
1144     if (file->changed)
1145     {
1146         struct stat file_status;
1147 
1148         if (extfs_cmd (" copyin ", EXTFS_SUPER (VFS_FILE_HANDLER_SUPER (fh)), file->ino->ent,
1149                        file->ino->localname))
1150             errno_code = EIO;
1151 
1152         if (stat (file->ino->localname, &file_status) != 0)
1153             errno_code = EIO;
1154         else
1155             file->ino->st.st_size = file_status.st_size;
1156 
1157         file->ino->st.st_mtime = time (NULL);
1158     }
1159 
1160     if (--VFS_FILE_HANDLER_SUPER (fh)->fd_usage == 0)
1161         vfs_stamp_create (vfs_extfs_ops, VFS_FILE_HANDLER_SUPER (fh));
1162 
1163     g_free (fh);
1164     if (errno_code != 0)
1165         ERRNOR (EIO, -1);
1166     return 0;
1167 }
1168 
1169 /* --------------------------------------------------------------------------------------------- */
1170 
1171 static int
1172 extfs_errno (struct vfs_class *me)
     /*   */
1173 {
1174     (void) me;
1175     return my_errno;
1176 }
1177 
1178 /* --------------------------------------------------------------------------------------------- */
1179 
1180 static void *
1181 extfs_opendir (const vfs_path_t *vpath)
     /*   */
1182 {
1183     struct extfs_super_t *archive = NULL;
1184     const char *q;
1185     struct vfs_s_entry *entry;
1186     GList **info;
1187 
1188     q = extfs_get_path (vpath, &archive, FL_NONE);
1189     if (q == NULL)
1190         return NULL;
1191     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1192     if (entry == NULL)
1193         return NULL;
1194     entry = extfs_resolve_symlinks (entry);
1195     if (entry == NULL)
1196         return NULL;
1197     if (!S_ISDIR (entry->ino->st.st_mode))
1198         ERRNOR (ENOTDIR, NULL);
1199 
1200     info = g_new (GList *, 1);
1201     *info = g_queue_peek_head_link (entry->ino->subdir);
1202 
1203     return info;
1204 }
1205 
1206 /* --------------------------------------------------------------------------------------------- */
1207 
1208 static struct vfs_dirent *
1209 extfs_readdir (void *data)
     /*   */
1210 {
1211     struct vfs_dirent *dir;
1212     GList **info = (GList **) data;
1213 
1214     if (*info == NULL)
1215         return NULL;
1216 
1217     dir = vfs_dirent_init (NULL, VFS_ENTRY ((*info)->data)->name, 0);  // FIXME: inode
1218 
1219     *info = g_list_next (*info);
1220 
1221     return dir;
1222 }
1223 
1224 /* --------------------------------------------------------------------------------------------- */
1225 
1226 static int
1227 extfs_closedir (void *data)
     /*   */
1228 {
1229     g_free (data);
1230     return 0;
1231 }
1232 
1233 /* --------------------------------------------------------------------------------------------- */
1234 
1235 static void
1236 extfs_stat_move (struct stat *buf, const struct vfs_s_inode *inode)
     /*   */
1237 {
1238     const time_t atime = inode->st.st_atime;
1239     const time_t mtime = inode->st.st_mtime;
1240     const time_t ctime = inode->st.st_ctime;
1241 
1242     *buf = inode->st;
1243 
1244 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1245     buf->st_blksize = RECORDSIZE;
1246 #endif
1247 
1248     vfs_adjust_stat (buf);
1249     vfs_zero_stat_times (buf);
1250 
1251     buf->st_atime = atime;
1252     buf->st_mtime = mtime;
1253     buf->st_ctime = ctime;
1254 }
1255 
1256 /* --------------------------------------------------------------------------------------------- */
1257 
1258 static int
1259 extfs_internal_stat (const vfs_path_t *vpath, struct stat *buf, gboolean resolve)
     /*   */
1260 {
1261     struct extfs_super_t *archive;
1262     const char *q;
1263     struct vfs_s_entry *entry;
1264     int result = -1;
1265 
1266     q = extfs_get_path (vpath, &archive, FL_NONE);
1267     if (q == NULL)
1268         goto cleanup;
1269     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1270     if (entry == NULL)
1271         goto cleanup;
1272     if (resolve)
1273     {
1274         entry = extfs_resolve_symlinks (entry);
1275         if (entry == NULL)
1276             goto cleanup;
1277     }
1278     extfs_stat_move (buf, entry->ino);
1279     result = 0;
1280 cleanup:
1281     return result;
1282 }
1283 
1284 /* --------------------------------------------------------------------------------------------- */
1285 
1286 static int
1287 extfs_stat (const vfs_path_t *vpath, struct stat *buf)
     /*   */
1288 {
1289     return extfs_internal_stat (vpath, buf, TRUE);
1290 }
1291 
1292 /* --------------------------------------------------------------------------------------------- */
1293 
1294 static int
1295 extfs_lstat (const vfs_path_t *vpath, struct stat *buf)
     /*   */
1296 {
1297     return extfs_internal_stat (vpath, buf, FALSE);
1298 }
1299 
1300 /* --------------------------------------------------------------------------------------------- */
1301 
1302 static int
1303 extfs_fstat (void *fh, struct stat *buf)
     /*   */
1304 {
1305     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1306 
1307     extfs_stat_move (buf, file->ino);
1308     return 0;
1309 }
1310 
1311 /* --------------------------------------------------------------------------------------------- */
1312 
1313 static int
1314 extfs_readlink (const vfs_path_t *vpath, char *buf, size_t size)
     /*   */
1315 {
1316     struct extfs_super_t *archive;
1317     const char *q;
1318     size_t len;
1319     struct vfs_s_entry *entry;
1320     int result = -1;
1321 
1322     q = extfs_get_path (vpath, &archive, FL_NONE);
1323     if (q == NULL)
1324         goto cleanup;
1325     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1326     if (entry == NULL)
1327         goto cleanup;
1328     if (!S_ISLNK (entry->ino->st.st_mode))
1329     {
1330         VFS_CLASS (vfs_path_get_last_path_vfs (vpath))->verrno = EINVAL;
1331         goto cleanup;
1332     }
1333     len = strlen (entry->ino->linkname);
1334     if (size < len)
1335         len = size;
1336     // readlink() does not append a NUL character to buf
1337     result = len;
1338     memcpy (buf, entry->ino->linkname, result);
1339 cleanup:
1340     return result;
1341 }
1342 
1343 /* --------------------------------------------------------------------------------------------- */
1344 
1345 static ssize_t
1346 extfs_write (void *fh, const char *buf, size_t nbyte)
     /*   */
1347 {
1348     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1349 
1350     file->changed = TRUE;
1351     return write (file->handle, buf, nbyte);
1352 }
1353 
1354 /* --------------------------------------------------------------------------------------------- */
1355 
1356 static int
1357 extfs_unlink (const vfs_path_t *vpath)
     /*   */
1358 {
1359     struct extfs_super_t *archive;
1360     const char *q;
1361     struct vfs_s_entry *entry;
1362     int result = -1;
1363 
1364     q = extfs_get_path (vpath, &archive, FL_NONE);
1365     if (q == NULL)
1366         goto cleanup;
1367     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1368     if (entry == NULL)
1369         goto cleanup;
1370     entry = extfs_resolve_symlinks (entry);
1371     if (entry == NULL)
1372         goto cleanup;
1373     if (S_ISDIR (entry->ino->st.st_mode))
1374     {
1375         VFS_CLASS (vfs_path_get_last_path_vfs (vpath))->verrno = EISDIR;
1376         goto cleanup;
1377     }
1378     if (extfs_cmd (" rm ", archive, entry, ""))
1379     {
1380         my_errno = EIO;
1381         goto cleanup;
1382     }
1383     vfs_s_free_entry (VFS_SUPER (archive)->me, entry);
1384     result = 0;
1385 cleanup:
1386     return result;
1387 }
1388 
1389 /* --------------------------------------------------------------------------------------------- */
1390 
1391 static int
1392 extfs_mkdir (const vfs_path_t *vpath, mode_t mode)
     /*   */
1393 {
1394     struct extfs_super_t *archive;
1395     const char *q;
1396     struct vfs_s_entry *entry;
1397     int result = -1;
1398     struct vfs_class *me;
1399 
1400     (void) mode;
1401 
1402     me = VFS_CLASS (vfs_path_get_last_path_vfs (vpath));
1403     q = extfs_get_path (vpath, &archive, FL_NONE);
1404     if (q == NULL)
1405         goto cleanup;
1406     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1407     if (entry != NULL)
1408     {
1409         me->verrno = EEXIST;
1410         goto cleanup;
1411     }
1412     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_MKDIR);
1413     if (entry == NULL)
1414         goto cleanup;
1415     entry = extfs_resolve_symlinks (entry);
1416     if (entry == NULL)
1417         goto cleanup;
1418     if (!S_ISDIR (entry->ino->st.st_mode))
1419     {
1420         me->verrno = ENOTDIR;
1421         goto cleanup;
1422     }
1423 
1424     if (extfs_cmd (" mkdir ", archive, entry, ""))
1425     {
1426         my_errno = EIO;
1427         vfs_s_free_entry (VFS_SUPER (archive)->me, entry);
1428         goto cleanup;
1429     }
1430     result = 0;
1431 cleanup:
1432     return result;
1433 }
1434 
1435 /* --------------------------------------------------------------------------------------------- */
1436 
1437 static int
1438 extfs_rmdir (const vfs_path_t *vpath)
     /*   */
1439 {
1440     struct extfs_super_t *archive;
1441     const char *q;
1442     struct vfs_s_entry *entry;
1443     int result = -1;
1444 
1445     q = extfs_get_path (vpath, &archive, FL_NONE);
1446     if (q == NULL)
1447         goto cleanup;
1448     entry = extfs_find_entry (VFS_SUPER (archive)->root, q, FL_NONE);
1449     if (entry == NULL)
1450         goto cleanup;
1451     entry = extfs_resolve_symlinks (entry);
1452     if (entry == NULL)
1453         goto cleanup;
1454     if (!S_ISDIR (entry->ino->st.st_mode))
1455     {
1456         VFS_CLASS (vfs_path_get_last_path_vfs (vpath))->verrno = ENOTDIR;
1457         goto cleanup;
1458     }
1459 
1460     if (extfs_cmd (" rmdir ", archive, entry, ""))
1461     {
1462         my_errno = EIO;
1463         goto cleanup;
1464     }
1465     vfs_s_free_entry (VFS_SUPER (archive)->me, entry);
1466     result = 0;
1467 cleanup:
1468     return result;
1469 }
1470 
1471 /* --------------------------------------------------------------------------------------------- */
1472 
1473 static int
1474 extfs_chdir (const vfs_path_t *vpath)
     /*   */
1475 {
1476     void *data;
1477 
1478     my_errno = ENOTDIR;
1479     data = extfs_opendir (vpath);
1480     if (data == NULL)
1481         return (-1);
1482     extfs_closedir (data);
1483     my_errno = 0;
1484     return 0;
1485 }
1486 
1487 /* --------------------------------------------------------------------------------------------- */
1488 
1489 static off_t
1490 extfs_lseek (void *fh, off_t offset, int whence)
     /*   */
1491 {
1492     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
1493 
1494     return lseek (file->handle, offset, whence);
1495 }
1496 
1497 /* --------------------------------------------------------------------------------------------- */
1498 
1499 static vfsid
1500 extfs_getid (const vfs_path_t *vpath)
     /*   */
1501 {
1502     struct extfs_super_t *archive = NULL;
1503     const char *p;
1504 
1505     p = extfs_get_path (vpath, &archive, FL_NO_OPEN);
1506     return (p == NULL ? NULL : (vfsid) archive);
1507 }
1508 
1509 /* --------------------------------------------------------------------------------------------- */
1510 
1511 static vfs_path_t *
1512 extfs_getlocalcopy (const vfs_path_t *vpath)
     /*   */
1513 {
1514     vfs_file_handler_t *fh;
1515     vfs_path_t *p;
1516 
1517     fh = VFS_FILE_HANDLER (extfs_open (vpath, O_RDONLY, 0));
1518     if (fh == NULL)
1519         return NULL;
1520     if (fh->ino->localname == NULL)
1521     {
1522         extfs_close ((void *) fh);
1523         return NULL;
1524     }
1525     p = vfs_path_from_str (fh->ino->localname);
1526     VFS_FILE_HANDLER_SUPER (fh)->fd_usage++;
1527     extfs_close ((void *) fh);
1528     return p;
1529 }
1530 
1531 /* --------------------------------------------------------------------------------------------- */
1532 
1533 static int
1534 extfs_ungetlocalcopy (const vfs_path_t *vpath, const vfs_path_t *local, gboolean has_changed)
     /*   */
1535 {
1536     vfs_file_handler_t *fh;
1537 
1538     fh = VFS_FILE_HANDLER (extfs_open (vpath, O_RDONLY, 0));
1539     if (fh == NULL)
1540         return 0;
1541 
1542     if (strcmp (fh->ino->localname, vfs_path_get_last_path_str (local)) == 0)
1543     {
1544         VFS_FILE_HANDLER_SUPER (fh)->fd_usage--;
1545         if (has_changed)
1546             fh->changed = TRUE;
1547         extfs_close ((void *) fh);
1548         return 0;
1549     }
1550     else
1551     {
1552         // Should not happen
1553         extfs_close ((void *) fh);
1554         return 0;
1555     }
1556 }
1557 
1558 /* --------------------------------------------------------------------------------------------- */
1559 
1560 static gboolean
1561 extfs_get_plugins (const char *where, gboolean silent)
     /*   */
1562 {
1563     char *dirname;
1564     GDir *dir;
1565     const char *filename;
1566 
1567     dirname = g_build_path (PATH_SEP_STR, where, MC_EXTFS_DIR, (char *) NULL);
1568     dir = g_dir_open (dirname, 0, NULL);
1569 
1570     /* We may not use vfs_die() message or message or similar,
1571      * UI is not initialized at this time and message would not
1572      * appear on screen. */
1573     if (dir == NULL)
1574     {
1575         if (!silent)
1576             fprintf (stderr, _ ("Warning: cannot open %s directory\n"), dirname);
1577         g_free (dirname);
1578         return FALSE;
1579     }
1580 
1581     if (extfs_plugins == NULL)
1582         extfs_plugins = g_array_sized_new (FALSE, TRUE, sizeof (extfs_plugin_info_t), 32);
1583 
1584     while ((filename = g_dir_read_name (dir)) != NULL)
1585     {
1586         char fullname[MC_MAXPATHLEN];
1587         struct stat s;
1588 
1589         g_snprintf (fullname, sizeof (fullname), "%s" PATH_SEP_STR "%s", dirname, filename);
1590 
1591         if ((stat (fullname, &s) == 0) && S_ISREG (s.st_mode) && !S_ISDIR (s.st_mode)
1592             && is_exe (s.st_mode))
1593         {
1594             int f;
1595 
1596             f = open (fullname, O_RDONLY);
1597 
1598             if (f >= 0)
1599             {
1600                 size_t len, i;
1601                 extfs_plugin_info_t info;
1602                 gboolean found = FALSE;
1603 
1604                 close (f);
1605 
1606                 /* Handle those with a trailing '+', those flag that the
1607                  * file system does not require an archive to work
1608                  */
1609                 len = strlen (filename);
1610                 info.need_archive = (filename[len - 1] != '+');
1611                 info.path = g_strconcat (dirname, PATH_SEP_STR, (char *) NULL);
1612                 info.prefix = g_strndup (filename, len);
1613 
1614                 // prepare to compare file names without trailing '+'
1615                 if (!info.need_archive)
1616                     info.prefix[len - 1] = '\0';
1617 
1618                 // don't overload already found plugin
1619                 for (i = 0; i < extfs_plugins->len && !found; i++)
1620                 {
1621                     extfs_plugin_info_t *p;
1622 
1623                     p = &g_array_index (extfs_plugins, extfs_plugin_info_t, i);
1624 
1625                     // 2 files with same names cannot be in a directory
1626                     found =
1627                         strcmp (info.path, p->path) != 0 && strcmp (info.prefix, p->prefix) == 0;
1628                 }
1629 
1630                 if (found)
1631                 {
1632                     g_free (info.path);
1633                     g_free (info.prefix);
1634                 }
1635                 else
1636                 {
1637                     // restore file name
1638                     if (!info.need_archive)
1639                         info.prefix[len - 1] = '+';
1640                     g_array_append_val (extfs_plugins, info);
1641                 }
1642             }
1643         }
1644     }
1645 
1646     g_dir_close (dir);
1647     g_free (dirname);
1648 
1649     return TRUE;
1650 }
1651 
1652 /* --------------------------------------------------------------------------------------------- */
1653 
1654 static int
1655 extfs_init (struct vfs_class *me)
     /*   */
1656 {
1657     gboolean d1, d2;
1658 
1659     (void) me;
1660 
1661     // 1st: scan user directory
1662     d1 = extfs_get_plugins (mc_config_get_data_path (), TRUE);  // silent about user dir
1663     // 2nd: scan system dir
1664     d2 = extfs_get_plugins (LIBEXECDIR, d1);
1665 
1666     return (d1 || d2 ? 1 : 0);
1667 }
1668 
1669 /* --------------------------------------------------------------------------------------------- */
1670 
1671 static void
1672 extfs_done (struct vfs_class *me)
     /*   */
1673 {
1674     size_t i;
1675 
1676     while (VFS_SUBCLASS (me)->supers != NULL)
1677         me->free ((vfsid) VFS_SUBCLASS (me)->supers->data);
1678 
1679     if (extfs_plugins == NULL)
1680         return;
1681 
1682     for (i = 0; i < extfs_plugins->len; i++)
1683     {
1684         extfs_plugin_info_t *info;
1685 
1686         info = &g_array_index (extfs_plugins, extfs_plugin_info_t, i);
1687         g_free (info->path);
1688         g_free (info->prefix);
1689     }
1690 
1691     g_array_free (extfs_plugins, TRUE);
1692 }
1693 
1694 /* --------------------------------------------------------------------------------------------- */
1695 
1696 static int
1697 extfs_setctl (const vfs_path_t *vpath, int ctlop, void *arg)
     /*   */
1698 {
1699     (void) arg;
1700 
1701     if (ctlop == VFS_SETCTL_RUN)
1702     {
1703         extfs_run (vpath);
1704         return 1;
1705     }
1706     return 0;
1707 }
1708 
1709 /* --------------------------------------------------------------------------------------------- */
1710 /*** public functions ****************************************************************************/
1711 /* --------------------------------------------------------------------------------------------- */
1712 
1713 void
1714 vfs_init_extfs (void)
     /*   */
1715 {
1716     vfs_init_subclass (&extfs_subclass, "extfs", VFSF_UNKNOWN, NULL);
1717     vfs_extfs_ops->init = extfs_init;
1718     vfs_extfs_ops->done = extfs_done;
1719     vfs_extfs_ops->fill_names = extfs_fill_names;
1720     vfs_extfs_ops->which = extfs_which;
1721     vfs_extfs_ops->open = extfs_open;
1722     vfs_extfs_ops->close = extfs_close;
1723     vfs_extfs_ops->read = extfs_read;
1724     vfs_extfs_ops->write = extfs_write;
1725     vfs_extfs_ops->opendir = extfs_opendir;
1726     vfs_extfs_ops->readdir = extfs_readdir;
1727     vfs_extfs_ops->closedir = extfs_closedir;
1728     vfs_extfs_ops->stat = extfs_stat;
1729     vfs_extfs_ops->lstat = extfs_lstat;
1730     vfs_extfs_ops->fstat = extfs_fstat;
1731     vfs_extfs_ops->readlink = extfs_readlink;
1732     vfs_extfs_ops->unlink = extfs_unlink;
1733     vfs_extfs_ops->chdir = extfs_chdir;
1734     vfs_extfs_ops->ferrno = extfs_errno;
1735     vfs_extfs_ops->lseek = extfs_lseek;
1736     vfs_extfs_ops->getid = extfs_getid;
1737     vfs_extfs_ops->getlocalcopy = extfs_getlocalcopy;
1738     vfs_extfs_ops->ungetlocalcopy = extfs_ungetlocalcopy;
1739     vfs_extfs_ops->mkdir = extfs_mkdir;
1740     vfs_extfs_ops->rmdir = extfs_rmdir;
1741     vfs_extfs_ops->setctl = extfs_setctl;
1742     extfs_subclass.free_inode = extfs_free_inode;
1743     extfs_subclass.free_archive = extfs_free_archive;
1744     vfs_register_class (vfs_extfs_ops);
1745 }
1746 
1747 /* --------------------------------------------------------------------------------------------- */
/* */
root/src/vfs/extfs/extfs.c

DEFINITIONS
