ROX-Filer/src/run.c

   1 /*
   2  * $Id$
   3  *
   4  * ROX-Filer, filer for the ROX desktop project
   5  * Copyright (C) 2002, the ROX-Filer team.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the Free
   9  * Software Foundation; either version 2 of the License, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  19  * Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 /* run.c */
  23
  24 #include "config.h"
  25
  26 #include <errno.h>
  27 #include <string.h>
  28 #include <sys/param.h>
  29
  30 #include "global.h"
  31
  32 #include "run.h"
  33 #include "support.h"
  34 #include "gui_support.h"
  35 #include "filer.h"
  36 #include "display.h"
  37 #include "main.h"
  38 #include "type.h"
  39 #include "dir.h"
  40 #include "diritem.h"
  41 #include "action.h"
  42 #include "icon.h"
  43
  44 /* Static prototypes */
  45 static void write_data(gpointer data, gint fd, GdkInputCondition cond);
  46 static gboolean follow_symlink(const char *full_path,
  47                                FilerWindow *filer_window,
  48                                FilerWindow *src_window);
  49 static gboolean open_file(const guchar *path, MIME_type *type);
  50 static void dir_show_help(DirItem *item, const char *path);
  51
  52 typedef struct _PipedData PipedData;
  53
  54 struct _PipedData
  55 {
  56         guchar          *data;
  57         gint            tag;
  58         gulong          sent;
  59         gulong          length;
  60 };
  61
  62
  63 /****************************************************************
  64  *                      EXTERNAL INTERFACE                      *
  65  ****************************************************************/
  66
  67
  68 /* An application has been double-clicked (or run in some other way) */
  69 void run_app(const char *path)
  70 {
  71         GString *apprun;
  72         const char *argv[] = {NULL, NULL};
  73
  74         apprun = g_string_new(path);
  75         argv[0] = g_string_append(apprun, "/AppRun")->str;
  76
  77         rox_spawn(home_dir, argv);
  78
  79         g_string_free(apprun, TRUE);
  80 }
  81
  82 /* Execute this program, passing all the URIs in the list as arguments.
  83  * URIs that are files on the local machine will be passed as simple
  84  * pathnames. The uri_list should be freed after this function returns.
  85  */
  86 void run_with_files(const char *path, GList *uri_list)
  87 {
  88         const char      **argv;
  89         int             argc = 0;
  90         struct stat     info;
  91
  92         if (stat(path, &info))
  93         {
  94                 delayed_error(_("Program %s not found - deleted?"), path);
  95                 return;
  96         }
  97
  98         argv = g_malloc(sizeof(char *) * (g_list_length(uri_list) + 2));
  99
 100         if (S_ISDIR(info.st_mode))
 101                 argv[argc++] = make_path(path, "AppRun")->str;
 102         else
 103                 argv[argc++] = path;
 104
 105         while (uri_list)
 106         {
 107                 const char *uri = uri_list->data;
 108                 const char *local;
 109
 110                 local = get_local_path(uri);
 111                 if (local)
 112                         argv[argc++] = local;
 113                 else
 114                         argv[argc++] = uri;
 115                 uri_list = uri_list->next;
 116         }
 117
 118         argv[argc++] = NULL;
 119
 120         rox_spawn(home_dir, argv);
 121 }
 122
 123 /* Run the program as '<path> -', piping the data to it via stdin.
 124  * You can g_free() the data as soon as this returns.
 125  */
 126 void run_with_data(const char *path, gpointer data, gulong length)
 127 {
 128         const char      *argv[] = {NULL, "-", NULL};
 129         struct stat     info;
 130         int             fds[2];
 131         PipedData       *pd;
 132
 133         if (stat(path, &info))
 134         {
 135                 delayed_error(_("Program %s not found - deleted?"), path);
 136                 return;
 137         }
 138
 139         if (S_ISDIR(info.st_mode))
 140                 argv[0] = make_path(path, "AppRun")->str;
 141         else
 142                 argv[0] = path;
 143
 144         if (pipe(fds))
 145         {
 146                 delayed_error("pipe: %s", g_strerror(errno));
 147                 return;
 148         }
 149         close_on_exec(fds[1], TRUE);
 150         close_on_exec(fds[0], TRUE);
 151
 152         switch (fork())
 153         {
 154                 case -1:
 155                         delayed_error("fork: %s", g_strerror(errno));
 156                         close(fds[1]);
 157                         break;
 158                 case 0:
 159                         /* We are the child */
 160                         chdir(home_dir);
 161                         if (dup2(fds[0], 0) == -1)
 162                                 g_warning("dup2() failed: %s\n",
 163                                                 g_strerror(errno));
 164                         else
 165                         {
 166                                 close_on_exec(0, FALSE);
 167                                 if (execv(argv[0], (char **) argv))
 168                                         g_warning("execv(%s) failed: %s\n",
 169                                                 argv[0], g_strerror(errno));
 170                         }
 171                         _exit(1);
 172                 default:
 173                         /* We are the parent */
 174                         set_blocking(fds[1], FALSE);
 175                         pd = g_new(PipedData, 1);
 176                         pd->data = g_malloc(length);
 177                         memcpy(pd->data, data, length);
 178                         pd->length = length;
 179                         pd->sent = 0;
 180                         pd->tag = gtk_input_add_full(fds[1], GDK_INPUT_WRITE,
 181                                                 write_data, NULL, pd, NULL);
 182                         break;
 183         }
 184
 185         close(fds[0]);
 186 }
 187
 188 /* Load a file, open a directory or run an application. Or, if 'edit' is set:
 189  * edit a file, open an application, follow a symlink or mount a device.
 190  *
 191  * filer_window is the window to use for displaying a directory.
 192  * NULL will always use a new directory when needed.
 193  * src_window is the window to copy options from, or NULL.
 194  *
 195  * Returns TRUE on success.
 196  */
 197 gboolean run_diritem(const guchar *full_path,
 198                      DirItem *item,
 199                      FilerWindow *filer_window,
 200                      FilerWindow *src_window,
 201                      gboolean edit)
 202 {
 203         if (item->flags & ITEM_FLAG_SYMLINK && edit)
 204                 return follow_symlink(full_path, filer_window, src_window);
 205
 206         switch (item->base_type)
 207         {
 208                 case TYPE_DIRECTORY:
 209                         if (item->flags & ITEM_FLAG_APPDIR && !edit)
 210                         {
 211                                 run_app(full_path);
 212                                 return TRUE;
 213                         }
 214
 215                         if (item->flags & ITEM_FLAG_MOUNT_POINT && edit)
 216                         {
 217                                 GList   *paths;
 218
 219                                 paths = g_list_prepend(NULL,
 220                                                         (gpointer) full_path);
 221                                 action_mount(paths, filer_window == NULL, -1);
 222                                 g_list_free(paths);
 223                                 if (item->flags & ITEM_FLAG_MOUNTED ||
 224                                                 !filer_window)
 225                                         return TRUE;
 226                         }
 227
 228                         if (filer_window)
 229                                 filer_change_to(filer_window, full_path, NULL);
 230                         else
 231                                 filer_opendir(full_path, src_window);
 232                         return TRUE;
 233                 case TYPE_FILE:
 234                         if ((item->mime_type == application_executable) && !edit)
 235                         {
 236                                 const char *argv[] = {NULL, NULL};
 237                                 guchar  *dir = filer_window
 238                                                 ? filer_window->sym_path
 239                                                 : NULL;
 240
 241                                 argv[0] = full_path;
 242
 243                                 return rox_spawn(dir, argv);
 244                         }
 245
 246                         return open_file(full_path, edit ? text_plain
 247                                                   : item->mime_type);
 248                 case TYPE_ERROR:
 249                         delayed_error(_("File doesn't exist, or I can't "
 250                                           "access it: %s"), full_path);
 251                         return FALSE;
 252                 default:
 253                         delayed_error(
 254                                 _("I don't know how to open '%s'"), full_path);
 255                         return FALSE;
 256         }
 257 }
 258
 259 /* Attempt to open this item */
 260 gboolean run_by_path(const guchar *full_path)
 261 {
 262         gboolean retval;
 263         DirItem *item;
 264
 265         /* XXX: Loads an image - wasteful */
 266         item = diritem_new("");
 267         diritem_restat(full_path, item, NULL);
 268         retval = run_diritem(full_path, item, NULL, NULL, FALSE);
 269         diritem_free(item);
 270
 271         return retval;
 272 }
 273
 274 void show_item_help(const guchar *path, DirItem *item)
 275 {
 276         switch (item->base_type)
 277         {
 278                 case TYPE_FILE:
 279                         if (item->flags & ITEM_FLAG_EXEC_FILE)
 280                                 info_message(
 281                                       _("Executable file:\n"
 282                                         "This is a file with an eXecute bit "
 283                                         "set - it can be run as a program."));
 284                         else
 285                                 info_message(
 286                                       _("File:\n"
 287                                         "This is a data file. Try using the "
 288                                         "Info menu item to find out more..."));
 289                         break;
 290                 case TYPE_DIRECTORY:
 291                         if (item->flags & ITEM_FLAG_MOUNT_POINT)
 292                                 info_message(
 293                                 _("Mount point:\n"
 294                                 "A mount point is a directory which another "
 295                                 "filing system can be mounted on. Everything "
 296                                 "on the mounted filesystem then appears to be "
 297                                 "inside the directory."));
 298                         else
 299                                 dir_show_help(item, path);
 300                         break;
 301                 case TYPE_CHAR_DEVICE:
 302                 case TYPE_BLOCK_DEVICE:
 303                         info_message(
 304                                 _("Device file:\n"
 305                                 "Device files allow you to read from or write "
 306                                 "to a device driver as though it was an "
 307                                 "ordinary file."));
 308                         break;
 309                 case TYPE_PIPE:
 310                         info_message(
 311                                 _("Named pipe:\n"
 312                                 "Pipes allow different programs to "
 313                                 "communicate. One program writes data to the "
 314                                 "pipe while another one reads it out again."));
 315                         break;
 316                 case TYPE_SOCKET:
 317                         info_message(
 318                                 _("Socket:\n"
 319                                 "Sockets allow processes to communicate."));
 320                         break;
 321                 default:
 322                         info_message(
 323                                 _("Unknown type:\n"
 324                                 "I couldn't find out what kind of file this "
 325                                 "is. Maybe it doesn't exist anymore or you "
 326                                 "don't have search permission on the directory "
 327                                 "it's in?"));
 328                         break;
 329         }
 330 }
 331
 332 /* Open a directory viewer showing this file, and wink it */
 333 void open_to_show(const guchar *path)
 334 {
 335         FilerWindow     *new;
 336         guchar          *dir, *slash;
 337
 338         g_return_if_fail(path != NULL);
 339
 340         dir = g_strdup(path);
 341         slash = strrchr(dir, '/');
 342         if (slash == dir || !slash)
 343         {
 344                 /* Item in the root (or root itself!) */
 345                 new = filer_opendir("/", NULL);
 346                 if (new && dir[1])
 347                         display_set_autoselect(new, dir + 1);
 348         }
 349         else
 350         {
 351                 *slash = '\0';
 352                 new = filer_opendir(dir, NULL);
 353                 if (new)
 354                 {
 355                         if (slash[1] == '.')
 356                                 display_set_hidden(new, TRUE);
 357                         display_set_autoselect(new, slash + 1);
 358                 }
 359         }
 360
 361         g_free(dir);
 362 }
 363
 364 /* Invoked using -x, this indicates that the filesystem has been modified
 365  * and we should look at this item again.
 366  */
 367 void examine(const guchar *path)
 368 {
 369         struct stat info;
 370
 371         if (mc_stat(path, &info) != 0)
 372         {
 373                 /* Deleted? Do a paranoid update of everything... */
 374                 filer_check_mounted(path);
 375         }
 376         else
 377         {
 378                 /* Update directory containing this item... */
 379                 dir_check_this(path);
 380
 381                 /* If this is itself a directory then rescan its contents... */
 382                 if (S_ISDIR(info.st_mode))
 383                         refresh_dirs(path);
 384
 385                 /* If it's on the pinboard, update the icon... */
 386                 icons_may_update(path);
 387         }
 388 }
 389
 390 /****************************************************************
 391  *                      INTERNAL FUNCTIONS                      *
 392  ****************************************************************/
 393
 394
 395 static void write_data(gpointer data, gint fd, GdkInputCondition cond)
 396 {
 397         PipedData *pd = (PipedData *) data;
 398
 399         while (pd->sent < pd->length)
 400         {
 401                 int     sent;
 402
 403                 sent = write(fd, pd->data + pd->sent, pd->length - pd->sent);
 404
 405                 if (sent < 0)
 406                 {
 407                         if (errno == EAGAIN)
 408                                 return;
 409                         delayed_error(_("Could not send data to program: %s"),
 410                                         g_strerror(errno));
 411                         goto finish;
 412                 }
 413
 414                 pd->sent += sent;
 415         }
 416
 417 finish:
 418         g_source_remove(pd->tag);
 419         g_free(pd->data);
 420         g_free(pd);
 421         close(fd);
 422 }
 423
 424 /* Follow the link 'full_path' and display it in filer_window, or a
 425  * new window if that is NULL.
 426  */
 427 static gboolean follow_symlink(const char *full_path,
 428                                FilerWindow *filer_window,
 429                                FilerWindow *src_window)
 430 {
 431         char    *real, *slash;
 432         char    *new_dir;
 433         char    path[MAXPATHLEN + 1];
 434         int     got;
 435
 436         got = readlink(full_path, path, MAXPATHLEN);
 437         if (got < 0)
 438         {
 439                 delayed_error(_("Could not read link: %s"),
 440                                   g_strerror(errno));
 441                 return FALSE;
 442         }
 443
 444         g_return_val_if_fail(got <= MAXPATHLEN, FALSE);
 445         path[got] = '\0';
 446
 447         /* Make a relative path absolute */
 448         if (path[0] != '/')
 449         {
 450                 guchar  *tmp;
 451                 slash = strrchr(full_path, '/');
 452                 g_return_val_if_fail(slash != NULL, FALSE);
 453
 454                 tmp = g_strndup(full_path, slash - full_path);
 455                 real = pathdup(make_path(tmp, path)->str);
 456                 /* NB: full_path may be invalid here... */
 457                 g_free(tmp);
 458         }
 459         else
 460                 real = pathdup(path);
 461
 462         slash = strrchr(real, '/');
 463         if (!slash)
 464         {
 465                 g_free(real);
 466                 delayed_error(
 467                         _("Broken symlink (or you don't have permission "
 468                           "to follow it): %s"), full_path);
 469                 return FALSE;
 470         }
 471
 472         *slash = '\0';
 473
 474         if (*real)
 475                 new_dir = real;
 476         else
 477                 new_dir = "/";
 478
 479         if (filer_window)
 480                 filer_change_to(filer_window, new_dir, slash + 1);
 481         else
 482         {
 483                 FilerWindow *new;
 484
 485                 new = filer_opendir(new_dir, src_window);
 486                 if (new)
 487                         display_set_autoselect(new, slash + 1);
 488         }
 489
 490         g_free(real);
 491
 492         return TRUE;
 493 }
 494
 495 /* Load this file into an appropriate editor */
 496 static gboolean open_file(const guchar *path, MIME_type *type)
 497 {
 498         g_return_val_if_fail(type != NULL, FALSE);
 499
 500         if (type_open(path, type))
 501                 return TRUE;
 502
 503         report_error(
 504                 _("No run action specified for files of this type (%s/%s) - "
 505                 "you can set a run action by choosing `Set Run Action' "
 506                 "from the File menu, or you can just drag the file to an "
 507                 "application"),
 508                 type->media_type,
 509                 type->subtype);
 510
 511         return FALSE;
 512 }
 513
 514 /* Show the help for a directory - tries to open App/Help, but if
 515  * that doesn't work then it displays a default message.
 516  */
 517 static void dir_show_help(DirItem *item, const char *path)
 518 {
 519         char            *help_dir;
 520         struct stat     info;
 521
 522         help_dir = g_strconcat(path, "/Help", NULL);
 523
 524         if (mc_stat(help_dir, &info) == 0)
 525                 filer_opendir(help_dir, NULL);
 526         else if (item->flags & ITEM_FLAG_APPDIR)
 527                 info_message(
 528                         _("Application:\n"
 529                         "This is an application directory - you can "
 530                         "run it as a program, or open it (hold down "
 531                         "Shift while you open it). Most applications provide "
 532                         "their own help here, but this one doesn't."));
 533         else
 534                 info_message(_("Directory:\n"
 535                                 "This is a directory. It contains an index to "
 536                                 "other items - open it to see the list."));
 537 }