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  1. /* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
  2.  * All rights reserved.
  3.  *
  4.  * Redistribution and use in source and binary forms, with or without
  5.  * modification, are permitted provided that the following conditions are met:
  6.  *
  7.  * Redistributions of source code must retain the above copyright notice, this
  8.  * list of conditions and the following disclaimer.
  9.  *
  10.  * Redistributions in binary form must reproduce the above copyright notice,
  11.  * this list of conditions and the following disclaimer in the documentation
  12.  * and/or other materials provided with the distribution.
  13.  *
  14.  * Neither the name of the original program's authors nor the names of its
  15.  * contributors may be used to endorse or promote products derived from this
  16.  * software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19.  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21.  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22.  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23.  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24.  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25.  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26.  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27.  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28.  * POSSIBILITY OF SUCH DAMAGE.
  29.  */
  30.  
  31. #include <stdio.h>
  32. #include <stdlib.h>
  33. #include <unistd.h>
  34. #include <fcntl.h>
  35. #include <dirent.h>
  36. #include <getopt.h>
  37. #include <mem.h>
  38. #include <string.h>
  39.  
  40. #include "config.h"
  41. #include "errors.h"
  42. #include "util.h"
  43. #include "entry.h"
  44. #include "rm.h"
  45. #include "cmds.h"
  46.  
  47. static char *cmdname = "rm";
  48. #define RM_VERSION "0.0.1"
  49.  
  50. static rm_job_t rm;
  51.  
  52. static struct option const long_options[] = {
  53.     { "help", no_argument, 0, 'h' },
  54.     { "version", no_argument, 0, 'v' },
  55.     { "recursive", no_argument, 0, 'r' },
  56.     { "force", no_argument, 0, 'f' },
  57.     { "safe", no_argument, 0, 's' },
  58.     { 0, 0, 0, 0 }
  59. };
  60.  
  61. static unsigned int rm_start(rm_job_t *rm)
  62. {
  63.     rm->recursive = 0;
  64.     rm->force = 0;
  65.     rm->safe = 0;
  66.  
  67.     /* Make sure we can allocate enough memory to store
  68.      * what is needed in the job structure */
  69.     if (NULL == (rm->nwd = (char *) malloc(PATH_MAX)))
  70.         return 0;
  71.     memset(rm->nwd, 0, sizeof(rm->nwd));
  72.  
  73.     if (NULL == (rm->owd = (char *) malloc(PATH_MAX)))
  74.         return 0;
  75.     memset(rm->owd, 0, sizeof(rm->owd));
  76.  
  77.     if (NULL == (rm->cwd = (char *) malloc(PATH_MAX)))
  78.         return 0;
  79.     memset(rm->cwd, 0, sizeof(rm->cwd));
  80.  
  81.     chdir(".");
  82.  
  83.     if (NULL == (getcwd(rm->owd, PATH_MAX)))
  84.         return 0;
  85.  
  86.     return 1;
  87. }
  88.  
  89. static void rm_end(rm_job_t *rm)
  90. {
  91.     if (NULL != rm->nwd)
  92.         free(rm->nwd);
  93.  
  94.     if (NULL != rm->owd)
  95.         free(rm->owd);
  96.  
  97.     if (NULL != rm->cwd)
  98.         free(rm->cwd);
  99.  
  100.     return;
  101. }
  102.  
  103. static unsigned int rm_recursive(const char *path)
  104. {
  105.     int rc;
  106.  
  107.     /* First see if it will just go away */
  108.     rc = rmdir(path);
  109.     if (rc == 0)
  110.         return 0;
  111.  
  112.     /* Its not empty, recursively scan it */
  113.     cli_error(CL_ENOTSUP,
  114.         "Can not remove %s, directory not empty", path);
  115.     return 1;
  116. }
  117.  
  118. static unsigned int rm_single(const char *path)
  119. {
  120.     if (unlink(path)) {
  121.         cli_error(CL_EFAIL, "rm: could not remove file %s", path);
  122.         return 1;
  123.     }
  124.     return 0;
  125. }
  126.  
  127. static unsigned int rm_scope(const char *path)
  128. {
  129.     int fd;
  130.     DIR *dirp;
  131.  
  132.     dirp = opendir(path);
  133.     if (dirp) {
  134.         closedir(dirp);
  135.         return RM_DIR;
  136.     }
  137.  
  138.     fd = open(path, O_RDONLY);
  139.     if (fd > 0) {
  140.         close(fd);
  141.         return RM_FILE;
  142.     }
  143.  
  144.     return RM_BOGUS;
  145. }
  146.  
  147. /* Dispays help for rm in various levels */
  148. void help_cmd_rm(unsigned int level)
  149. {
  150.     if (level == HELP_SHORT) {
  151.         printf("`%s' removes files and directories.\n", cmdname);
  152.     } else {
  153.         help_cmd_rm(HELP_SHORT);
  154.         printf(
  155.         "Usage:  %s [options] <path>\n"
  156.         "Options:\n"
  157.         "  -h, --help       A short option summary\n"
  158.         "  -v, --version    Print version information and exit\n"
  159.         "  -r, --recursive  Recursively remove sub directories\n"
  160.         "  -f, --force      Do not prompt prior to removing files\n"
  161.         "  -s, --safe       Stop if directories change during removal\n\n"
  162.         "Currently, %s is under development, some options don't work.\n",
  163.         cmdname, cmdname);
  164.     }
  165.     return;
  166. }
  167.  
  168. /* Main entry point for rm, accepts an array of arguments */
  169. int cmd_rm(char **argv)
  170. {
  171.     unsigned int argc;
  172.     unsigned int i, scope, ret = 0;
  173.     int c, opt_ind;
  174.     size_t len;
  175.     char *buff = NULL;
  176.  
  177.     argc = cli_count_args(argv);
  178.  
  179.     if (argc < 2) {
  180.         cli_error(CL_EFAIL,
  181.             "%s: insufficient arguments. Try %s --help", cmdname, cmdname);
  182.         return CMD_FAILURE;
  183.     }
  184.  
  185.     if (!rm_start(&rm)) {
  186.         cli_error(CL_ENOMEM, "%s: could not initialize", cmdname);
  187.         rm_end(&rm);
  188.         return CMD_FAILURE;
  189.     }
  190.  
  191.     for (c = 0, optind = 0, opt_ind = 0; c != -1;) {
  192.         c = getopt_long(argc, argv, "hvrfs", long_options, &opt_ind);
  193.         switch (c) {
  194.         case 'h':
  195.             help_cmd_rm(HELP_LONG);
  196.             return CMD_SUCCESS;
  197.         case 'v':
  198.             printf("%s\n", RM_VERSION);
  199.             return CMD_SUCCESS;
  200.         case 'r':
  201.             rm.recursive = 1;
  202.             break;
  203.         case 'f':
  204.             rm.force = 1;
  205.             break;
  206.         case 's':
  207.             rm.safe = 1;
  208.             break;
  209.         }
  210.     }
  211.  
  212.     if ((unsigned) optind == argc) {
  213.         cli_error(CL_EFAIL,
  214.             "%s: insufficient arguments. Try %s --help", cmdname, cmdname);
  215.         rm_end(&rm);
  216.         return CMD_FAILURE;
  217.     }
  218.  
  219.     i = optind;
  220.     while (NULL != argv[i]) {
  221.         len = str_size(argv[i]) + 2;
  222.         buff = (char *) realloc(buff, len);
  223.         if (buff == NULL) {
  224.             printf("rm: out of memory\n");
  225.             ret = 1;
  226.             break;
  227.         }
  228.         memset(buff, 0, sizeof(buff));
  229.         snprintf(buff, len, argv[i]);
  230.  
  231.         scope = rm_scope(buff);
  232.         switch (scope) {
  233.         case RM_BOGUS: /* FIXME */
  234.         case RM_FILE:
  235.             ret += rm_single(buff);
  236.             break;
  237.         case RM_DIR:
  238.             if (! rm.recursive) {
  239.                 printf("%s is a directory, use -r to remove it.\n", buff);
  240.                 ret ++;
  241.             } else {
  242.                 ret += rm_recursive(buff);
  243.             }
  244.             break;
  245.         }
  246.         i++;
  247.     }
  248.  
  249.     if (NULL != buff)
  250.         free(buff);
  251.  
  252.     rm_end(&rm);
  253.  
  254.     if (ret)
  255.         return CMD_FAILURE;
  256.     else
  257.         return CMD_SUCCESS;
  258. }
  259.  
  260.