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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.  
  38. #include "config.h"
  39. #include "errors.h"
  40. #include "util.h"
  41. #include "entry.h"
  42. #include "rm.h"
  43. #include "cmds.h"
  44.  
  45. static char *cmdname = "rm";
  46. #define RM_VERSION "0.0.1"
  47.  
  48. static rm_job_t rm;
  49.  
  50. static struct option const long_options[] = {
  51.     { "help", no_argument, 0, 'h' },
  52.     { "version", no_argument, 0, 'v' },
  53.     { "recursive", no_argument, 0, 'r' },
  54.     { "force", no_argument, 0, 'f' },
  55.     { "safe", no_argument, 0, 's' },
  56.     { 0, 0, 0, 0 }
  57. };
  58.  
  59. static unsigned int rm_start(rm_job_t *rm)
  60. {
  61.     rm->recursive = 0;
  62.     rm->force = 0;
  63.     rm->safe = 0;
  64.  
  65.     /* Make sure we can allocate enough memory to store
  66.      * what is needed in the job structure */
  67.     if (NULL == (rm->nwd = (char *) malloc(PATH_MAX)))
  68.         return 0;
  69.     memset(rm->nwd, 0, sizeof(rm->nwd));
  70.  
  71.     if (NULL == (rm->owd = (char *) malloc(PATH_MAX)))
  72.         return 0;
  73.     memset(rm->owd, 0, sizeof(rm->owd));
  74.  
  75.     if (NULL == (rm->cwd = (char *) malloc(PATH_MAX)))
  76.         return 0;
  77.     memset(rm->cwd, 0, sizeof(rm->cwd));
  78.  
  79.     chdir(".");
  80.  
  81.     if (NULL == (getcwd(rm->owd, PATH_MAX)))
  82.         return 0;
  83.  
  84.     return 1;
  85. }
  86.  
  87. static void rm_end(rm_job_t *rm)
  88. {
  89.     if (NULL != rm->nwd)
  90.         free(rm->nwd);
  91.  
  92.     if (NULL != rm->owd)
  93.         free(rm->owd);
  94.  
  95.     if (NULL != rm->cwd)
  96.         free(rm->cwd);
  97.  
  98.     return;
  99. }
  100.  
  101. static unsigned int rm_recursive(const char *path)
  102. {
  103.     int rc;
  104.  
  105.     /* First see if it will just go away */
  106.     rc = rmdir(path);
  107.     if (rc == 0)
  108.         return 0;
  109.  
  110.     /* Its not empty, recursively scan it */
  111.     cli_error(CL_ENOTSUP,
  112.         "Can not remove %s, directory not empty", path);
  113.     return 1;
  114. }
  115.  
  116. static unsigned int rm_single(const char *path)
  117. {
  118.     if (unlink(path)) {
  119.         cli_error(CL_EFAIL, "rm: could not remove file %s", path);
  120.         return 1;
  121.     }
  122.     return 0;
  123. }
  124.  
  125. static unsigned int rm_scope(const char *path)
  126. {
  127.     int fd;
  128.     DIR *dirp;
  129.  
  130.     dirp = opendir(path);
  131.     if (dirp) {
  132.         closedir(dirp);
  133.         return RM_DIR;
  134.     }
  135.  
  136.     fd = open(path, O_RDONLY);
  137.     if (fd > 0) {
  138.         close(fd);
  139.         return RM_FILE;
  140.     }
  141.  
  142.     return RM_BOGUS;
  143. }
  144.  
  145. /* Dispays help for rm in various levels */
  146. void help_cmd_rm(unsigned int level)
  147. {
  148.     if (level == HELP_SHORT) {
  149.         printf("`%s' removes files and directories.\n", cmdname);
  150.     } else {
  151.         help_cmd_rm(HELP_SHORT);
  152.         printf(
  153.         "Usage:  %s [options] <path>\n"
  154.         "Options:\n"
  155.         "  -h, --help       A short option summary\n"
  156.         "  -v, --version    Print version information and exit\n"
  157.         "  -r, --recursive  Recursively remove sub directories\n"
  158.         "  -f, --force      Do not prompt prior to removing files\n"
  159.         "  -s, --safe       Stop if directories change during removal\n\n"
  160.         "Currently, %s is under development, some options don't work.\n",
  161.         cmdname, cmdname);
  162.     }
  163.     return;
  164. }
  165.  
  166. /* Main entry point for rm, accepts an array of arguments */
  167. int cmd_rm(char **argv)
  168. {
  169.     unsigned int argc;
  170.     unsigned int i, scope, ret = 0;
  171.     int c, opt_ind;
  172.     size_t len;
  173.     char *buff = NULL;
  174.  
  175.     argc = cli_count_args(argv);
  176.  
  177.     if (argc < 2) {
  178.         cli_error(CL_EFAIL,
  179.             "%s: insufficient arguments. Try %s --help", cmdname, cmdname);
  180.         return CMD_FAILURE;
  181.     }
  182.  
  183.     if (!rm_start(&rm)) {
  184.         cli_error(CL_ENOMEM, "%s: could not initialize", cmdname);
  185.         rm_end(&rm);
  186.         return CMD_FAILURE;
  187.     }
  188.  
  189.     for (c = 0, optind = 0, opt_ind = 0; c != -1;) {
  190.         c = getopt_long(argc, argv, "hvrfs", long_options, &opt_ind);
  191.         switch (c) {
  192.         case 'h':
  193.             help_cmd_rm(HELP_LONG);
  194.             return CMD_SUCCESS;
  195.         case 'v':
  196.             printf("%s\n", RM_VERSION);
  197.             return CMD_SUCCESS;
  198.         case 'r':
  199.             rm.recursive = 1;
  200.             break;
  201.         case 'f':
  202.             rm.force = 1;
  203.             break;
  204.         case 's':
  205.             rm.safe = 1;
  206.             break;
  207.         }
  208.     }
  209.  
  210.     if (optind == argc) {
  211.         cli_error(CL_EFAIL,
  212.             "%s: insufficient arguments. Try %s --help", cmdname, cmdname);
  213.         rm_end(&rm);
  214.         return CMD_FAILURE;
  215.     }
  216.  
  217.     i = optind;
  218.     while (NULL != argv[i]) {
  219.         len = strlen(argv[i]) + 2;
  220.         buff = (char *) realloc(buff, len);
  221.         if (buff == NULL) {
  222.             printf("rm: out of memory\n");
  223.             ret = 1;
  224.             break;
  225.         }
  226.         memset(buff, 0, sizeof(buff));
  227.         snprintf(buff, len, argv[i]);
  228.  
  229.         scope = rm_scope(buff);
  230.         switch (scope) {
  231.         case RM_BOGUS: /* FIXME */
  232.         case RM_FILE:
  233.             ret += rm_single(buff);
  234.             break;
  235.         case RM_DIR:
  236.             if (! rm.recursive) {
  237.                 printf("%s is a directory, use -r to remove it.\n", buff);
  238.                 ret ++;
  239.             } else {
  240.                 ret += rm_recursive(buff);
  241.             }
  242.             break;
  243.         }
  244.         i++;
  245.     }
  246.  
  247.     if (NULL != buff)
  248.         free(buff);
  249.  
  250.     rm_end(&rm);
  251.  
  252.     if (ret)
  253.         return CMD_FAILURE;
  254.     else
  255.         return CMD_SUCCESS;
  256. }
  257.  
  258.