1 | /* |
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2 | * $Source: /afs/dev.mit.edu/source/repository/athena/bin/delete/undelete.c,v $ |
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3 | * $Author: jik $ |
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4 | * |
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5 | * This program is part of a package including delete, undelete, |
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6 | * lsdel, expunge and purge. The software suite is meant as a |
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7 | * replacement for rm which allows for file recovery. |
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8 | * |
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9 | * Copyright (c) 1989 by the Massachusetts Institute of Technology. |
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10 | * For copying and distribution information, see the file "mit-copyright.h." |
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11 | */ |
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12 | |
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13 | #if (!defined(lint) && !defined(SABER)) |
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14 | static char rcsid_undelete_c[] = "$Header: /afs/dev.mit.edu/source/repository/athena/bin/delete/undelete.c,v 1.14 1989-02-01 03:42:21 jik Exp $"; |
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15 | #endif |
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16 | |
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17 | #include <stdio.h> |
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18 | #include <sys/types.h> |
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19 | #include <sys/dir.h> |
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20 | #include <sys/param.h> |
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21 | #include <strings.h> |
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22 | #include <sys/stat.h> |
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23 | #include "directories.h" |
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24 | #include "pattern.h" |
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25 | #include "util.h" |
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26 | #include "undelete.h" |
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27 | |
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28 | #define ERROR_MASK 1 |
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29 | #define NO_DELETE_MASK 2 |
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30 | |
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31 | char *malloc(), *realloc(); |
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32 | |
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33 | int interactive, recursive, verbose, directoriesonly, noop, force; |
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34 | int del_recursive = 0; /* this tells the pattern matcher that we do */ |
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35 | /* *not* want it to recurse deleted directories */ |
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36 | /* when recursive is set to false. */ |
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37 | |
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38 | char *whoami, *error_buf; |
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39 | |
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40 | |
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41 | |
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42 | |
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43 | main(argc, argv) |
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44 | int argc; |
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45 | char *argv[]; |
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46 | { |
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47 | extern char *optarg; |
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48 | extern int optind; |
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49 | int arg; |
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50 | int status = 0; |
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51 | |
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52 | whoami = lastpart(argv[0]); |
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53 | interactive = recursive = verbose = directoriesonly = noop = force = 0; |
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54 | error_buf = malloc(MAXPATHLEN + strlen(whoami)); |
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55 | if (! error_buf) { |
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56 | perror(whoami); |
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57 | exit(1); |
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58 | } |
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59 | while ((arg = getopt(argc, argv, "firvnR")) != -1) { |
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60 | switch (arg) { |
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61 | case 'f': |
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62 | force++; |
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63 | break; |
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64 | case 'i': |
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65 | interactive++; |
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66 | break; |
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67 | case 'r': |
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68 | recursive++; |
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69 | if (directoriesonly) { |
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70 | fprintf(stderr, "%s: -r and -R and mutually exclusive.\n", |
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71 | whoami); |
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72 | usage(); |
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73 | exit(1); |
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74 | } |
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75 | break; |
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76 | case 'v': |
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77 | verbose++; |
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78 | break; |
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79 | case 'n': |
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80 | noop++; |
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81 | break; |
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82 | case 'R': |
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83 | directoriesonly++; |
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84 | if (recursive) { |
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85 | fprintf(stderr, "%s: -r and -R are mutually exclusive.\n", |
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86 | whoami); |
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87 | usage(); |
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88 | exit(1); |
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89 | } |
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90 | default: |
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91 | usage(); |
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92 | exit(1); |
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93 | } |
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94 | } |
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95 | if (optind == argc) |
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96 | exit(interactive_mode()); |
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97 | else while (optind < argc) { |
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98 | status = status | undelete(argv[optind]); |
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99 | optind++; |
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100 | } |
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101 | exit(status & ERROR_MASK); |
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102 | } |
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103 | |
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104 | |
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105 | |
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106 | interactive_mode() |
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107 | { |
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108 | char buf[MAXPATHLEN]; |
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109 | char *ptr; |
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110 | int status = 0; |
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111 | |
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112 | if (verbose) { |
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113 | printf("Enter the files to be undeleted, one file per line.\n"); |
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114 | printf("Hit <RETURN> on a line by itself to exit.\n\n"); |
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115 | } |
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116 | do { |
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117 | printf("%s: ", whoami); |
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118 | ptr = fgets(buf, MAXPATHLEN, stdin); |
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119 | if (! ptr) { |
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120 | printf("\n"); |
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121 | return(status); |
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122 | } |
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123 | ptr = index(buf, '\n'); /* fgets breakage */ |
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124 | if (ptr) |
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125 | *ptr = '\0'; |
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126 | if (! *buf) |
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127 | return(status); |
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128 | status = status | undelete(buf); |
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129 | } while (*ptr); |
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130 | return(status); |
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131 | } |
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132 | |
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133 | |
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134 | |
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135 | usage() |
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136 | { |
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137 | fprintf(stderr, "Usage: %s [ options ] [filename ...]\n", whoami); |
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138 | fprintf(stderr, "Options are:\n"); |
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139 | fprintf(stderr, " -r recursive\n"); |
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140 | fprintf(stderr, " -i interactive\n"); |
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141 | fprintf(stderr, " -f force\n"); |
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142 | fprintf(stderr, " -v verbose\n"); |
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143 | fprintf(stderr, " -n noop\n"); |
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144 | fprintf(stderr, " -R directories only (i.e. no recursion)\n"); |
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145 | fprintf(stderr, " -- end options and start filenames\n"); |
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146 | fprintf(stderr, "-r and -D are mutually exclusive\n"); |
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147 | } |
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148 | |
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149 | |
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150 | undelete(file_exp) |
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151 | char *file_exp; |
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152 | { |
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153 | char *file_re; |
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154 | char **found_files; |
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155 | int num_found; |
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156 | char *startdir; |
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157 | int status = 0; |
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158 | filerec *current; |
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159 | |
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160 | if (*file_exp == '/') { |
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161 | startdir = "/"; |
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162 | file_re = parse_pattern(file_exp + 1); |
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163 | } |
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164 | else { |
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165 | startdir = ""; |
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166 | file_re = parse_pattern(file_exp); |
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167 | } |
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168 | if (! file_re) |
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169 | return(ERROR_MASK); |
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170 | found_files = get_the_files(startdir, file_re, &num_found); |
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171 | free(file_re); |
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172 | if (num_found) { |
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173 | process_files(found_files, num_found); |
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174 | if (*file_exp == '/') |
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175 | current = get_root_tree(); |
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176 | else |
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177 | current = get_cwd_tree(); |
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178 | status = recurs_and_undelete(current); |
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179 | } |
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180 | else { |
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181 | if (! force) |
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182 | fprintf(stderr, "%s: %s not found\n", whoami, file_exp); |
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183 | status = ERROR_MASK; |
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184 | } |
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185 | return(status); |
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186 | } |
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187 | |
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188 | |
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189 | |
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190 | |
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191 | |
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192 | recurs_and_undelete(leaf) |
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193 | filerec *leaf; |
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194 | { |
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195 | int status = 0; |
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196 | |
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197 | if ((leaf->specified) && ((leaf->specs.st_mode & S_IFMT) == S_IFDIR)) |
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198 | status = do_directory_undelete(leaf); |
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199 | /* the "do_directory_undelete" really only asks the user if he */ |
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200 | /* wants to expunge the directory, it doesn't do any deleting. */ |
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201 | if (! status) { |
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202 | if (leaf->dirs) |
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203 | status |= recurs_and_undelete(leaf->dirs); |
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204 | if (leaf->files) |
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205 | status |= recurs_and_undelete(leaf->files); |
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206 | } |
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207 | if (leaf->specified) |
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208 | status |= do_undelete(leaf); |
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209 | if (leaf->next) |
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210 | status |= recurs_and_undelete(leaf->next); |
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211 | free_leaf(leaf); |
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212 | return(status); |
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213 | } |
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214 | |
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215 | |
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216 | |
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217 | |
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218 | |
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219 | |
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220 | do_directory_undelete(file_ent) |
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221 | filerec *file_ent; |
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222 | { |
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223 | char buf[MAXPATHLEN]; |
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224 | |
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225 | get_leaf_path(file_ent, buf); |
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226 | convert_to_user_name(buf, buf); |
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227 | |
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228 | if (interactive) { |
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229 | printf("%s: Undelete directory %s? ", whoami, buf); |
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230 | if (! yes()) |
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231 | return(NO_DELETE_MASK); |
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232 | } |
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233 | return(0); |
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234 | } |
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235 | |
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236 | |
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237 | |
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238 | |
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239 | |
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240 | process_files(files, num) |
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241 | char **files; |
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242 | int num; |
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243 | { |
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244 | int i; |
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245 | listrec *new_files; |
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246 | listrec *filelist; |
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247 | |
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248 | filelist = (listrec *) malloc(sizeof(listrec) * num); |
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249 | if (! filelist) { |
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250 | perror(sprintf(error_buf, "%s: process_files\n", whoami)); |
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251 | exit(1); |
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252 | } |
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253 | for (i = 0; i < num; i++) { |
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254 | filelist[i].real_name = malloc(strlen(files[i]) + 1); |
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255 | strcpy(filelist[i].real_name, files[i]); |
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256 | filelist[i].user_name = malloc(strlen(files[i]) + 1); |
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257 | convert_to_user_name(files[i], filelist[i].user_name); |
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258 | free(files[i]); |
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259 | } |
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260 | free(files); |
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261 | |
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262 | new_files = sort_files(filelist, num); |
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263 | new_files = unique(new_files, &num); |
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264 | if (initialize_tree()) { |
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265 | exit(1); |
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266 | } |
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267 | for (i = 0; i < num; i++) { |
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268 | if (!add_path_to_tree(new_files[i].real_name)) { |
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269 | fprintf(stderr, "%s: error adding path to filename tree\n", |
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270 | whoami); |
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271 | exit(1); |
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272 | } |
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273 | else { |
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274 | free(new_files[i].real_name); |
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275 | free(new_files[i].user_name); |
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276 | } |
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277 | } |
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278 | free(new_files); |
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279 | return(0); |
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280 | } |
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281 | |
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282 | |
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283 | |
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284 | |
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285 | |
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286 | |
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287 | |
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288 | |
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289 | do_undelete(file_ent) |
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290 | filerec *file_ent; |
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291 | { |
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292 | struct stat stat_buf; |
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293 | char user_name[MAXPATHLEN], real_name[MAXPATHLEN]; |
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294 | |
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295 | get_leaf_path(file_ent, real_name); |
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296 | convert_to_user_name(real_name, user_name); |
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297 | |
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298 | if (interactive) { |
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299 | if ((file_ent->specs.st_mode & S_IFMT) == S_IFDIR) |
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300 | printf("%s: Undelete directory %s? ", whoami, user_name); |
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301 | else |
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302 | printf("%s: Undelete %s? ", whoami, user_name); |
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303 | if (! yes()) |
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304 | return(NO_DELETE_MASK); |
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305 | } |
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306 | if (! lstat(user_name, &stat_buf)) if (! force) { |
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307 | printf("%s: An undeleted %s already exists.\n", whoami, user_name); |
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308 | printf("Do you wish to continue with the undelete and overwrite that version? "); |
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309 | if (! yes()) |
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310 | return(NO_DELETE_MASK); |
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311 | unlink_completely(user_name); |
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312 | } |
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313 | if (noop) { |
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314 | printf("%s: %s would be undeleted\n", whoami, user_name); |
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315 | return(0); |
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316 | } |
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317 | |
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318 | if (! do_file_rename(real_name, user_name)) { |
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319 | if (verbose) |
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320 | printf("%s: %s undeleted\n", whoami, user_name); |
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321 | return(0); |
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322 | } |
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323 | else { |
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324 | if (! force) |
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325 | fprintf(stderr, "%s: %s not undeleted\n", whoami, user_name); |
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326 | return(ERROR_MASK); |
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327 | } |
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328 | } |
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329 | |
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330 | |
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331 | |
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332 | |
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333 | do_file_rename(real_name, user_name) |
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334 | char *real_name, *user_name; |
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335 | { |
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336 | char *ptr; |
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337 | |
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338 | char old_name[MAXPATHLEN], new_name[MAXPATHLEN]; |
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339 | char buf[MAXPATHLEN]; |
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340 | |
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341 | strcpy(old_name, real_name); |
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342 | strcpy(new_name, real_name); |
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343 | |
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344 | while (ptr = strrindex(new_name, ".#")) { |
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345 | convert_to_user_name(ptr, ptr); |
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346 | strcpy(ptr, firstpart(ptr, buf)); |
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347 | strcpy(&old_name[ptr - new_name], |
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348 | firstpart(&old_name[ptr - new_name], buf)); |
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349 | if (rename(old_name, new_name)) { |
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350 | return(ERROR_MASK); |
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351 | } |
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352 | if (ptr > new_name) { |
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353 | *--ptr = '\0'; |
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354 | old_name[ptr - new_name] = '\0'; |
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355 | } |
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356 | } |
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357 | change_path(real_name, user_name); |
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358 | return(0); |
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359 | } |
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360 | |
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361 | |
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362 | |
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363 | |
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364 | |
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365 | |
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366 | filecmp(file1, file2) |
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367 | listrec *file1, *file2; |
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368 | { |
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369 | return(strcmp(file1->user_name, file2->user_name)); |
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370 | } |
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371 | |
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372 | |
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373 | |
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374 | listrec *sort_files(data, num_data) |
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375 | listrec *data; |
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376 | int num_data; |
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377 | { |
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378 | qsort(data, num_data, sizeof(listrec), filecmp); |
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379 | return(data); |
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380 | } |
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381 | |
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382 | |
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383 | |
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384 | |
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385 | |
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386 | listrec *unique(files, number) |
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387 | listrec *files; |
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388 | int *number; |
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389 | { |
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390 | int i, last; |
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391 | int offset; |
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392 | |
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393 | for (last = 0, i = 1; i < *number; i++) { |
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394 | if (! strcmp(files[last].user_name, files[i].user_name)) { |
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395 | int better; |
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396 | |
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397 | better = choose_better(files[last].real_name, |
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398 | files[i].real_name); |
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399 | if (better == 1) { /* the first one is better */ |
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400 | free (files[i].real_name); |
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401 | free (files[i].user_name); |
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402 | files[i].real_name = (char *) NULL; |
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403 | } |
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404 | else { |
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405 | free (files[last].real_name); |
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406 | free (files[last].user_name); |
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407 | files[last].real_name = (char *) NULL; |
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408 | last = i; |
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409 | } |
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410 | } |
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411 | else |
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412 | last = i; |
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413 | } |
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414 | |
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415 | for (offset = 0, i = 0; i + offset < *number; i++) { |
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416 | if (! files[i].real_name) |
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417 | offset++; |
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418 | if (i + offset < *number) |
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419 | files[i] = files[i + offset]; |
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420 | } |
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421 | *number -= offset; |
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422 | files = (listrec *) realloc(files, sizeof(listrec) * *number); |
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423 | if (! files) { |
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424 | perror(sprintf(error_buf, "%s: unique", whoami)); |
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425 | exit(1); |
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426 | } |
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427 | return(files); |
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428 | } |
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429 | |
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430 | |
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431 | |
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432 | |
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433 | choose_better(str1, str2) |
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434 | char *str1, *str2; |
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435 | { |
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436 | char *pos1, *pos2; |
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437 | |
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438 | pos1 = strindex(str1, ".#"); |
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439 | pos2 = strindex(str2, ".#"); |
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440 | while (pos1 && pos2) { |
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441 | if (pos1 - str1 < pos2 - str2) |
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442 | return(2); |
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443 | else if (pos2 - str2 < pos1 - str1) |
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444 | return(1); |
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445 | pos1 = strindex(pos1 + 1, ".#"); |
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446 | pos2 = strindex(pos2 + 1, ".#"); |
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447 | } |
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448 | if (! pos1) |
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449 | return(1); |
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450 | else |
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451 | return(2); |
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452 | } |
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453 | |
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454 | |
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455 | |
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456 | |
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457 | |
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458 | unlink_completely(filename) |
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459 | char *filename; |
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460 | { |
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461 | char buf[MAXPATHLEN]; |
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462 | struct stat stat_buf; |
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463 | DIR *dirp; |
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464 | struct direct *dp; |
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465 | int status = 0; |
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466 | |
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467 | if (lstat(filename, &stat_buf)) |
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468 | return(1); |
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469 | |
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470 | if ((stat_buf.st_mode & S_IFMT) == S_IFDIR) { |
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471 | dirp = opendir(filename); |
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472 | if (! dirp) |
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473 | return(1); |
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474 | for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) { |
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475 | if (is_dotfile(dp->d_name)) |
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476 | continue; |
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477 | strcpy(buf, append(filename, dp->d_name)); |
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478 | if (! buf) { |
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479 | status = 1; |
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480 | continue; |
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481 | } |
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482 | status = status | unlink_completely(buf); |
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483 | } |
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484 | closedir(dirp); |
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485 | } |
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486 | else |
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487 | return(unlink(filename) == -1); |
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488 | return(0); |
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489 | } |
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490 | |
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491 | |
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492 | |
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493 | |
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494 | char **get_the_files(base, reg_exp, num_found) |
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495 | char *base, *reg_exp; |
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496 | int *num_found; |
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497 | { |
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498 | char **matches; |
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499 | int num_matches; |
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500 | char **found; |
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501 | int num; |
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502 | int i; |
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503 | |
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504 | found = (char **) malloc(0); |
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505 | num = 0; |
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506 | |
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507 | matches = find_matches(base, reg_exp, &num_matches); |
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508 | if (recursive) { |
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509 | char **recurs_found; |
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510 | int recurs_num; |
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511 | |
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512 | for (i = 0; i < num_matches; free(matches[i]), i++) { |
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513 | if (is_deleted(lastpart(matches[i]))) { |
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514 | found = add_str(found, num, matches[i]); |
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515 | num++; |
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516 | } |
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517 | recurs_found = find_deleted_recurses(matches[i], &recurs_num); |
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518 | add_arrays(&found, &num, &recurs_found, &recurs_num); |
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519 | } |
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520 | } |
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521 | else { |
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522 | struct stat stat_buf; |
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523 | char **contents_found; |
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524 | int num_contents; |
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525 | |
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526 | for (i = 0; i < num_matches; free(matches[i]), i++) { |
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527 | if (is_deleted(lastpart(matches[i]))) { |
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528 | found = add_str(found, num, matches[i]); |
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529 | num++; |
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530 | } |
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531 | else if (! directoriesonly) { |
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532 | if (lstat(matches[i], &stat_buf)) |
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533 | continue; |
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534 | if ((stat_buf.st_mode & S_IFMT) == S_IFDIR) { |
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535 | contents_found = find_deleted_contents(matches[i], |
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536 | &num_contents); |
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537 | add_arrays(&found, &num, &contents_found, |
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538 | &num_contents); |
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539 | } |
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540 | } |
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541 | } |
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542 | |
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543 | } |
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544 | free(matches); |
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545 | *num_found = num; |
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546 | return(found); |
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547 | } |
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548 | |
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549 | |
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550 | |
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551 | |
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552 | |
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