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