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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 { ... } |
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20 | |
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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 $_ variable. If you do then |
35 | make sure you return it to its original value before exiting your function. |
36 | |
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37 | This library is primarily for the C<find2perl> tool, which when fed, |
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38 | |
39 | find2perl / -name .nfs\* -mtime +7 \ |
40 | -exec rm -f {} \; -o -fstype nfs -prune |
41 | |
42 | produces something like: |
43 | |
44 | sub wanted { |
45 | /^\.nfs.*$/ && |
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 | } |
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67 | |
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68 | =head1 BUGS |
69 | |
70 | There is no way to make find or finddepth follow symlinks. |
71 | |
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72 | =cut |
73 | |
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74 | @ISA = qw(Exporter); |
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75 | @EXPORT = qw(find finddepth); |
76 | |
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77 | |
78 | sub find { |
79 | my $wanted = shift; |
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80 | my $cwd = Cwd::cwd(); |
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81 | # Localize these rather than lexicalizing them for backwards |
82 | # compatibility. |
83 | local($topdir,$topdev,$topino,$topmode,$topnlink); |
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84 | foreach $topdir (@_) { |
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85 | (($topdev,$topino,$topmode,$topnlink) = |
86 | ($Is_VMS ? stat($topdir) : lstat($topdir))) |
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87 | || (warn("Can't stat $topdir: $!\n"), next); |
88 | if (-d _) { |
89 | if (chdir($topdir)) { |
90 | ($dir,$_) = ($topdir,'.'); |
91 | $name = $topdir; |
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92 | $prune = 0; |
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93 | &$wanted; |
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94 | next if $prune; |
95 | my $fixtopdir = $topdir; |
96 | $fixtopdir =~ s,/$,, ; |
97 | $fixtopdir =~ s/\.dir$// if $Is_VMS; |
98 | &finddir($wanted,$fixtopdir,$topnlink); |
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99 | } |
100 | else { |
101 | warn "Can't cd to $topdir: $!\n"; |
102 | } |
103 | } |
104 | else { |
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105 | unless (($_,$dir) = File::Basename::fileparse($topdir)) { |
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106 | ($dir,$_) = ('.', $topdir); |
107 | } |
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108 | if (chdir($dir)) { |
109 | $name = $topdir; |
110 | &$wanted; |
111 | } |
112 | else { |
113 | warn "Can't cd to $dir: $!\n"; |
114 | } |
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115 | } |
116 | chdir $cwd; |
117 | } |
118 | } |
119 | |
120 | sub finddir { |
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121 | my($wanted, $nlink); |
122 | local($dir, $name); |
123 | ($wanted, $dir, $nlink) = @_; |
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124 | |
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125 | my($dev, $ino, $mode, $subcount); |
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126 | |
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127 | # Get the list of files in the current directory. |
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128 | opendir(DIR,'.') || (warn "Can't open $dir: $!\n", return); |
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129 | my(@filenames) = readdir(DIR); |
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130 | closedir(DIR); |
131 | |
132 | if ($nlink == 2 && !$dont_use_nlink) { # This dir has no subdirectories. |
133 | for (@filenames) { |
134 | next if $_ eq '.'; |
135 | next if $_ eq '..'; |
136 | $name = "$dir/$_"; |
137 | $nlink = 0; |
138 | &$wanted; |
139 | } |
140 | } |
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141 | else { # This dir has subdirectories. |
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142 | $subcount = $nlink - 2; |
143 | for (@filenames) { |
144 | next if $_ eq '.'; |
145 | next if $_ eq '..'; |
146 | $nlink = $prune = 0; |
147 | $name = "$dir/$_"; |
148 | &$wanted; |
149 | if ($subcount > 0 || $dont_use_nlink) { # Seen all the subdirs? |
150 | |
151 | # Get link count and check for directoriness. |
152 | |
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153 | ($dev,$ino,$mode,$nlink) = ($Is_VMS ? stat($_) : lstat($_)); |
154 | # unless ($nlink || $dont_use_nlink); |
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155 | |
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156 | if (-d _) { |
157 | |
158 | # It really is a directory, so do it recursively. |
159 | |
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160 | --$subcount; |
161 | next if $prune; |
162 | if (chdir $_) { |
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163 | $name =~ s/\.dir$// if $Is_VMS; |
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164 | &finddir($wanted,$name,$nlink); |
165 | chdir '..'; |
166 | } |
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167 | else { |
168 | warn "Can't cd to $_: $!\n"; |
169 | } |
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170 | } |
171 | } |
172 | } |
173 | } |
174 | } |
175 | |
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176 | |
177 | sub finddepth { |
178 | my $wanted = shift; |
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179 | my $cwd = Cwd::cwd(); |
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180 | # Localize these rather than lexicalizing them for backwards |
181 | # compatibility. |
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182 | local($topdir,$topdev,$topino,$topmode,$topnlink); |
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183 | foreach $topdir (@_) { |
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184 | (($topdev,$topino,$topmode,$topnlink) = |
185 | ($Is_VMS ? stat($topdir) : lstat($topdir))) |
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186 | || (warn("Can't stat $topdir: $!\n"), next); |
187 | if (-d _) { |
188 | if (chdir($topdir)) { |
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189 | my $fixtopdir = $topdir; |
190 | $fixtopdir =~ s,/$,, ; |
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191 | $fixtopdir =~ s/\.dir$// if $Is_VMS; |
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192 | &finddepthdir($wanted,$fixtopdir,$topnlink); |
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193 | ($dir,$_) = ($topdir,'.'); |
194 | $name = $topdir; |
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195 | &$wanted; |
196 | } |
197 | else { |
198 | warn "Can't cd to $topdir: $!\n"; |
199 | } |
200 | } |
201 | else { |
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202 | unless (($_,$dir) = File::Basename::fileparse($topdir)) { |
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203 | ($dir,$_) = ('.', $topdir); |
204 | } |
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205 | if (chdir($dir)) { |
206 | $name = $topdir; |
207 | &$wanted; |
208 | } |
209 | else { |
210 | warn "Can't cd to $dir: $!\n"; |
211 | } |
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212 | } |
213 | chdir $cwd; |
214 | } |
215 | } |
216 | |
217 | sub finddepthdir { |
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218 | my($wanted, $nlink); |
219 | local($dir, $name); |
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220 | ($wanted, $dir, $nlink) = @_; |
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221 | my($dev, $ino, $mode, $subcount); |
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222 | |
223 | # Get the list of files in the current directory. |
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224 | opendir(DIR,'.') || (warn "Can't open $dir: $!\n", return); |
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225 | my(@filenames) = readdir(DIR); |
226 | closedir(DIR); |
227 | |
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228 | if ($nlink == 2 && !$dont_use_nlink) { # This dir has no subdirectories. |
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229 | for (@filenames) { |
230 | next if $_ eq '.'; |
231 | next if $_ eq '..'; |
232 | $name = "$dir/$_"; |
233 | $nlink = 0; |
234 | &$wanted; |
235 | } |
236 | } |
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237 | else { # This dir has subdirectories. |
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238 | $subcount = $nlink - 2; |
239 | for (@filenames) { |
240 | next if $_ eq '.'; |
241 | next if $_ eq '..'; |
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242 | $nlink = 0; |
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243 | $name = "$dir/$_"; |
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244 | if ($subcount > 0 || $dont_use_nlink) { # Seen all the subdirs? |
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245 | |
246 | # Get link count and check for directoriness. |
247 | |
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248 | ($dev,$ino,$mode,$nlink) = ($Is_VMS ? stat($_) : lstat($_)); |
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249 | |
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250 | if (-d _) { |
251 | |
252 | # It really is a directory, so do it recursively. |
253 | |
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254 | --$subcount; |
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255 | if (chdir $_) { |
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256 | $name =~ s/\.dir$// if $Is_VMS; |
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257 | &finddepthdir($wanted,$name,$nlink); |
258 | chdir '..'; |
259 | } |
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260 | else { |
261 | warn "Can't cd to $_: $!\n"; |
262 | } |
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263 | } |
264 | } |
265 | &$wanted; |
266 | } |
267 | } |
268 | } |
269 | |
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270 | # Set dont_use_nlink in your hint file if your system's stat doesn't |
271 | # report the number of links in a directory as an indication |
272 | # of the number of files. |
273 | # See, e.g. hints/machten.sh for MachTen 2.2. |
274 | $dont_use_nlink = 1 if ($Config::Config{'dont_use_nlink'}); |
275 | |
276 | # These are hard-coded for now, but may move to hint files. |
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277 | if ($^O eq 'VMS') { |
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278 | $Is_VMS = 1; |
279 | $dont_use_nlink = 1; |
280 | } |
281 | |
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282 | $dont_use_nlink = 1 |
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283 | if $^O eq 'os2' || $^O eq 'dos' || $^O eq 'amigaos' || $^O eq 'MSWin32'; |
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284 | |
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285 | 1; |
286 | |