1 | package File::Find; |
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2 | require 5.000; |
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3 | require Exporter; |
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4 | use Config; |
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5 | require Cwd; |
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6 | require File::Basename; |
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7 | |
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8 | |
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9 | =head1 NAME |
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10 | |
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11 | find - traverse a file tree |
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12 | |
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13 | finddepth - traverse a directory structure depth-first |
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14 | |
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15 | =head1 SYNOPSIS |
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16 | |
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17 | use File::Find; |
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18 | find(\&wanted, '/foo','/bar'); |
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19 | sub wanted { ... } |
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20 | |
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21 | use File::Find; |
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22 | finddepth(\&wanted, '/foo','/bar'); |
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23 | sub wanted { ... } |
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24 | |
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25 | =head1 DESCRIPTION |
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26 | |
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27 | The wanted() function does whatever verifications you want. |
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28 | $File::Find::dir contains the current directory name, and $_ the |
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29 | current filename within that directory. $File::Find::name contains |
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30 | C<"$File::Find::dir/$_">. You are chdir()'d to $File::Find::dir when |
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31 | the function is called. The function may set $File::Find::prune to |
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32 | prune the tree. |
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33 | |
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34 | File::Find assumes that you don't alter the $_ variable. If you do then |
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35 | make sure you return it to its original value before exiting your function. |
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36 | |
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37 | This library is primarily for the C<find2perl> tool, which when fed, |
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38 | |
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39 | find2perl / -name .nfs\* -mtime +7 \ |
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40 | -exec rm -f {} \; -o -fstype nfs -prune |
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41 | |
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42 | produces something like: |
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43 | |
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44 | sub wanted { |
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45 | /^\.nfs.*$/ && |
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46 | (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) && |
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47 | int(-M _) > 7 && |
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48 | unlink($_) |
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49 | || |
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50 | ($nlink || (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_))) && |
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51 | $dev < 0 && |
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52 | ($File::Find::prune = 1); |
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53 | } |
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54 | |
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55 | Set the variable $File::Find::dont_use_nlink if you're using AFS, |
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56 | since AFS cheats. |
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57 | |
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58 | C<finddepth> is just like C<find>, except that it does a depth-first |
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59 | search. |
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60 | |
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61 | Here's another interesting wanted function. It will find all symlinks |
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62 | that don't resolve: |
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63 | |
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64 | sub wanted { |
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65 | -l && !-e && print "bogus link: $File::Find::name\n"; |
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66 | } |
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67 | |
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68 | =head1 BUGS |
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69 | |
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70 | There is no way to make find or finddepth follow symlinks. |
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71 | |
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72 | =cut |
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73 | |
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74 | @ISA = qw(Exporter); |
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75 | @EXPORT = qw(find finddepth); |
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76 | |
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77 | |
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78 | sub find { |
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79 | my $wanted = shift; |
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80 | my $cwd = Cwd::cwd(); |
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81 | # Localize these rather than lexicalizing them for backwards |
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82 | # compatibility. |
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83 | local($topdir,$topdev,$topino,$topmode,$topnlink); |
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84 | foreach $topdir (@_) { |
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85 | (($topdev,$topino,$topmode,$topnlink) = |
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86 | ($Is_VMS ? stat($topdir) : lstat($topdir))) |
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87 | || (warn("Can't stat $topdir: $!\n"), next); |
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88 | if (-d _) { |
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89 | if (chdir($topdir)) { |
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90 | ($dir,$_) = ($topdir,'.'); |
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91 | $name = $topdir; |
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92 | $prune = 0; |
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93 | &$wanted; |
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94 | if (!$prune) { |
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95 | my $fixtopdir = $topdir; |
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96 | $fixtopdir =~ s,/$,, ; |
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97 | $fixtopdir =~ s/\.dir$// if $Is_VMS; |
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98 | $fixtopdir =~ s/\\dir$// if $Is_NT; |
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99 | &finddir($wanted,$fixtopdir,$topnlink); |
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100 | } |
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101 | } |
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102 | else { |
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103 | warn "Can't cd to $topdir: $!\n"; |
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104 | } |
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105 | } |
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106 | else { |
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107 | unless (($_,$dir) = File::Basename::fileparse($topdir)) { |
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108 | ($dir,$_) = ('.', $topdir); |
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109 | } |
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110 | $name = $topdir; |
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111 | chdir $dir && &$wanted; |
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112 | } |
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113 | chdir $cwd; |
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114 | } |
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115 | } |
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116 | |
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117 | sub finddir { |
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118 | my($wanted, $nlink); |
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119 | local($dir, $name); |
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120 | ($wanted, $dir, $nlink) = @_; |
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121 | |
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122 | my($dev, $ino, $mode, $subcount); |
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123 | |
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124 | # Get the list of files in the current directory. |
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125 | opendir(DIR,'.') || (warn "Can't open $dir: $!\n", return); |
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126 | my(@filenames) = readdir(DIR); |
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127 | closedir(DIR); |
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128 | |
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129 | if ($nlink == 2 && !$dont_use_nlink) { # This dir has no subdirectories. |
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130 | for (@filenames) { |
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131 | next if $_ eq '.'; |
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132 | next if $_ eq '..'; |
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133 | $name = "$dir/$_"; |
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134 | $nlink = 0; |
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135 | &$wanted; |
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136 | } |
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137 | } |
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138 | else { # This dir has subdirectories. |
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139 | $subcount = $nlink - 2; |
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140 | for (@filenames) { |
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141 | next if $_ eq '.'; |
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142 | next if $_ eq '..'; |
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143 | $nlink = $prune = 0; |
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144 | $name = "$dir/$_"; |
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145 | &$wanted; |
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146 | if ($subcount > 0 || $dont_use_nlink) { # Seen all the subdirs? |
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147 | |
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148 | # Get link count and check for directoriness. |
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149 | |
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150 | ($dev,$ino,$mode,$nlink) = ($Is_VMS ? stat($_) : lstat($_)); |
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151 | # unless ($nlink || $dont_use_nlink); |
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152 | |
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153 | if (-d _) { |
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154 | |
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155 | # It really is a directory, so do it recursively. |
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156 | |
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157 | if (!$prune && chdir $_) { |
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158 | $name =~ s/\.dir$// if $Is_VMS; |
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159 | $name =~ s/\\dir$// if $Is_NT; |
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160 | &finddir($wanted,$name,$nlink); |
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161 | chdir '..'; |
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162 | } |
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163 | --$subcount; |
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164 | } |
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165 | } |
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166 | } |
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167 | } |
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168 | } |
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169 | |
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170 | |
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171 | sub finddepth { |
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172 | my $wanted = shift; |
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173 | |
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174 | $cwd = Cwd::fastcwd();; |
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175 | |
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176 | # Localize these rather than lexicalizing them for backwards |
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177 | # compatibility. |
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178 | local($topdir, $topdev, $topino, $topmode, $topnlink); |
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179 | foreach $topdir (@_) { |
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180 | (($topdev,$topino,$topmode,$topnlink) = |
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181 | ($Is_VMS ? stat($topdir) : lstat($topdir))) |
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182 | || (warn("Can't stat $topdir: $!\n"), next); |
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183 | if (-d _) { |
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184 | if (chdir($topdir)) { |
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185 | my $fixtopdir = $topdir; |
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186 | $fixtopdir =~ s,/$,, ; |
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187 | $fixtopdir =~ s/\.dir$// if $Is_VMS; |
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188 | $fixtopdir =~ s/\\dir$// if $Is_NT; |
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189 | &finddepthdir($wanted,$fixtopdir,$topnlink); |
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190 | ($dir,$_) = ($fixtopdir,'.'); |
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191 | $name = $fixtopdir; |
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192 | &$wanted; |
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193 | } |
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194 | else { |
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195 | warn "Can't cd to $topdir: $!\n"; |
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196 | } |
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197 | } |
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198 | else { |
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199 | unless (($_,$dir) = File::Basename::fileparse($topdir)) { |
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200 | ($dir,$_) = ('.', $topdir); |
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201 | } |
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202 | $name = $topdir; |
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203 | chdir $dir && &$wanted; |
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204 | } |
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205 | chdir $cwd; |
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206 | } |
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207 | } |
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208 | |
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209 | sub finddepthdir { |
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210 | my($wanted, $nlink); |
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211 | local($dir, $name); |
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212 | ($wanted,$dir,$nlink) = @_; |
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213 | my($dev, $ino, $mode, $subcount); |
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214 | |
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215 | # Get the list of files in the current directory. |
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216 | opendir(DIR,'.') || warn "Can't open $dir: $!\n"; |
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217 | my(@filenames) = readdir(DIR); |
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218 | closedir(DIR); |
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219 | |
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220 | if ($nlink == 2 && !$dont_use_nlink) { # This dir has no subdirectories. |
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221 | for (@filenames) { |
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222 | next if $_ eq '.'; |
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223 | next if $_ eq '..'; |
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224 | $name = "$dir/$_"; |
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225 | $nlink = 0; |
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226 | &$wanted; |
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227 | } |
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228 | } |
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229 | else { # This dir has subdirectories. |
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230 | $subcount = $nlink - 2; |
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231 | for (@filenames) { |
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232 | next if $_ eq '.'; |
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233 | next if $_ eq '..'; |
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234 | $nlink = 0; |
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235 | $name = "$dir/$_"; |
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236 | if ($subcount > 0 || $dont_use_nlink) { # Seen all the subdirs? |
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237 | |
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238 | # Get link count and check for directoriness. |
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239 | |
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240 | ($dev,$ino,$mode,$nlink) = ($Is_VMS ? stat($_) : lstat($_)); |
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241 | |
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242 | if (-d _) { |
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243 | |
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244 | # It really is a directory, so do it recursively. |
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245 | |
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246 | if (chdir $_) { |
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247 | $name =~ s/\.dir$// if $Is_VMS; |
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248 | $name =~ s/\\dir$// if $Is_NT; |
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249 | &finddepthdir($wanted,$name,$nlink); |
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250 | chdir '..'; |
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251 | } |
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252 | --$subcount; |
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253 | } |
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254 | } |
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255 | &$wanted; |
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256 | } |
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257 | } |
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258 | } |
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259 | |
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260 | # Set dont_use_nlink in your hint file if your system's stat doesn't |
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261 | # report the number of links in a directory as an indication |
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262 | # of the number of files. |
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263 | # See, e.g. hints/machten.sh for MachTen 2.2. |
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264 | $dont_use_nlink = 1 if ($Config::Config{'dont_use_nlink'}); |
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265 | |
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266 | # These are hard-coded for now, but may move to hint files. |
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267 | if ($^O eq 'VMS') { |
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268 | $Is_VMS = 1; |
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269 | $dont_use_nlink = 1; |
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270 | } |
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271 | if ($^O =~ m:^mswin32:i) { |
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272 | $Is_NT = 1; |
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273 | $dont_use_nlink = 1; |
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274 | } |
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275 | |
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276 | $dont_use_nlink = 1 |
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277 | if $^O eq 'os2' || $^O eq 'msdos' || $^O eq 'amigaos'; |
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278 | |
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279 | 1; |
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280 | |
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