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1 | package File::Find; |
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2 | use strict; |
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3 | use warnings; |
4 | use 5.6.0; |
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5 | our $VERSION = '1.01'; |
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6 | require Exporter; |
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7 | require Cwd; |
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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; |
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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 | use File::Find; |
26 | find({ wanted => \&process, follow => 1 }, '.'); |
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27 | |
28 | =head1 DESCRIPTION |
29 | |
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30 | The first argument to find() is either a hash reference describing the |
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31 | operations to be performed for each file, or a code reference. |
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32 | |
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33 | Here are the possible keys for the hash: |
34 | |
35 | =over 3 |
36 | |
37 | =item C<wanted> |
38 | |
39 | The value should be a code reference. This code reference is called |
40 | I<the wanted() function> below. |
41 | |
42 | =item C<bydepth> |
43 | |
44 | Reports the name of a directory only AFTER all its entries |
45 | have been reported. Entry point finddepth() is a shortcut for |
46 | specifying C<{ bydepth => 1 }> in the first argument of find(). |
47 | |
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48 | =item C<preprocess> |
49 | |
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50 | The value should be a code reference. This code reference is used to |
51 | preprocess the current directory. The name of currently processed |
52 | directory is in $File::Find::dir. Your preprocessing function is |
53 | called after readdir() but before the loop that calls the wanted() |
54 | function. It is called with a list of strings (actually file/directory |
55 | names) and is expected to return a list of strings. The code can be |
56 | used to sort the file/directory names alphabetically, numerically, |
57 | or to filter out directory entries based on their name alone. When |
58 | I<follow> or I<follow_fast> are in effect, C<preprocess> is a no-op. |
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59 | |
60 | =item C<postprocess> |
61 | |
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62 | The value should be a code reference. It is invoked just before leaving |
63 | the currently processed directory. It is called in void context with no |
64 | arguments. The name of the current directory is in $File::Find::dir. This |
65 | hook is handy for summarizing a directory, such as calculating its disk |
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66 | usage. When I<follow> or I<follow_fast> are in effect, C<postprocess> is a |
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67 | no-op. |
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68 | |
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69 | =item C<follow> |
70 | |
71 | Causes symbolic links to be followed. Since directory trees with symbolic |
72 | links (followed) may contain files more than once and may even have |
73 | cycles, a hash has to be built up with an entry for each file. |
74 | This might be expensive both in space and time for a large |
75 | directory tree. See I<follow_fast> and I<follow_skip> below. |
76 | If either I<follow> or I<follow_fast> is in effect: |
77 | |
78 | =over 6 |
79 | |
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80 | =item * |
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81 | |
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82 | It is guaranteed that an I<lstat> has been called before the user's |
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83 | I<wanted()> function is called. This enables fast file checks involving S< _>. |
84 | |
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85 | =item * |
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86 | |
87 | There is a variable C<$File::Find::fullname> which holds the absolute |
88 | pathname of the file with all symbolic links resolved |
89 | |
90 | =back |
91 | |
92 | =item C<follow_fast> |
93 | |
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94 | This is similar to I<follow> except that it may report some files more |
95 | than once. It does detect cycles, however. Since only symbolic links |
96 | have to be hashed, this is much cheaper both in space and time. If |
97 | processing a file more than once (by the user's I<wanted()> function) |
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98 | is worse than just taking time, the option I<follow> should be used. |
99 | |
100 | =item C<follow_skip> |
101 | |
102 | C<follow_skip==1>, which is the default, causes all files which are |
103 | neither directories nor symbolic links to be ignored if they are about |
104 | to be processed a second time. If a directory or a symbolic link |
105 | are about to be processed a second time, File::Find dies. |
106 | C<follow_skip==0> causes File::Find to die if any file is about to be |
107 | processed a second time. |
108 | C<follow_skip==2> causes File::Find to ignore any duplicate files and |
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109 | directories but to proceed normally otherwise. |
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110 | |
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111 | =item C<dangling_symlinks> |
112 | |
113 | If true and a code reference, will be called with the symbolic link |
114 | name and the directory it lives in as arguments. Otherwise, if true |
115 | and warnings are on, warning "symbolic_link_name is a dangling |
116 | symbolic link\n" will be issued. If false, the dangling symbolic link |
117 | will be silently ignored. |
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118 | |
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119 | =item C<no_chdir> |
120 | |
121 | Does not C<chdir()> to each directory as it recurses. The wanted() |
122 | function will need to be aware of this, of course. In this case, |
123 | C<$_> will be the same as C<$File::Find::name>. |
124 | |
125 | =item C<untaint> |
126 | |
127 | If find is used in taint-mode (-T command line switch or if EUID != UID |
128 | or if EGID != GID) then internally directory names have to be untainted |
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129 | before they can be chdir'ed to. Therefore they are checked against a regular |
130 | expression I<untaint_pattern>. Note that all names passed to the user's |
131 | I<wanted()> function are still tainted. If this option is used while |
132 | not in taint-mode, C<untaint> is a no-op. |
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133 | |
134 | =item C<untaint_pattern> |
135 | |
136 | See above. This should be set using the C<qr> quoting operator. |
137 | The default is set to C<qr|^([-+@\w./]+)$|>. |
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138 | Note that the parantheses are vital. |
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139 | |
140 | =item C<untaint_skip> |
141 | |
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142 | If set, a directory which fails the I<untaint_pattern> is skipped, |
143 | including all its sub-directories. The default is to 'die' in such a case. |
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144 | |
145 | =back |
146 | |
147 | The wanted() function does whatever verifications you want. |
148 | C<$File::Find::dir> contains the current directory name, and C<$_> the |
149 | current filename within that directory. C<$File::Find::name> contains |
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150 | the complete pathname to the file. You are chdir()'d to |
151 | C<$File::Find::dir> when the function is called, unless C<no_chdir> |
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152 | was specified. When C<follow> or C<follow_fast> are in effect, there is |
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153 | also a C<$File::Find::fullname>. The function may set |
154 | C<$File::Find::prune> to prune the tree unless C<bydepth> was |
155 | specified. Unless C<follow> or C<follow_fast> is specified, for |
156 | compatibility reasons (find.pl, find2perl) there are in addition the |
157 | following globals available: C<$File::Find::topdir>, |
158 | C<$File::Find::topdev>, C<$File::Find::topino>, |
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159 | C<$File::Find::topmode> and C<$File::Find::topnlink>. |
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160 | |
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161 | This library is useful for the C<find2perl> tool, which when fed, |
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162 | |
163 | find2perl / -name .nfs\* -mtime +7 \ |
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164 | -exec rm -f {} \; -o -fstype nfs -prune |
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165 | |
166 | produces something like: |
167 | |
168 | sub wanted { |
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169 | /^\.nfs.*\z/s && |
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170 | (($dev, $ino, $mode, $nlink, $uid, $gid) = lstat($_)) && |
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171 | int(-M _) > 7 && |
172 | unlink($_) |
173 | || |
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174 | ($nlink || (($dev, $ino, $mode, $nlink, $uid, $gid) = lstat($_))) && |
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175 | $dev < 0 && |
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176 | ($File::Find::prune = 1); |
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177 | } |
178 | |
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179 | Set the variable C<$File::Find::dont_use_nlink> if you're using AFS, |
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180 | since AFS cheats. |
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181 | |
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182 | |
183 | Here's another interesting wanted function. It will find all symlinks |
184 | that don't resolve: |
185 | |
186 | sub wanted { |
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187 | -l && !-e && print "bogus link: $File::Find::name\n"; |
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188 | } |
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189 | |
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190 | See also the script C<pfind> on CPAN for a nice application of this |
191 | module. |
192 | |
193 | =head1 CAVEAT |
194 | |
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195 | Be aware that the option to follow symbolic links can be dangerous. |
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196 | Depending on the structure of the directory tree (including symbolic |
197 | links to directories) you might traverse a given (physical) directory |
198 | more than once (only if C<follow_fast> is in effect). |
199 | Furthermore, deleting or changing files in a symbolically linked directory |
200 | might cause very unpleasant surprises, since you delete or change files |
201 | in an unknown directory. |
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202 | |
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203 | =head1 NOTES |
204 | |
205 | =over 4 |
206 | |
207 | =item * |
208 | |
209 | Mac OS (Classic) users should note a few differences: |
210 | |
211 | =over 4 |
212 | |
213 | =item * |
214 | |
215 | The path separator is ':', not '/', and the current directory is denoted |
216 | as ':', not '.'. You should be careful about specifying relative pathnames. |
217 | While a full path always begins with a volume name, a relative pathname |
218 | should always begin with a ':'. If specifying a volume name only, a |
219 | trailing ':' is required. |
220 | |
221 | =item * |
222 | |
223 | C<$File::Find::dir> is guaranteed to end with a ':'. If C<$_> |
224 | contains the name of a directory, that name may or may not end with a |
225 | ':'. Likewise, C<$File::Find::name>, which contains the complete |
226 | pathname to that directory, and C<$File::Find::fullname>, which holds |
227 | the absolute pathname of that directory with all symbolic links resolved, |
228 | may or may not end with a ':'. |
229 | |
230 | =item * |
231 | |
232 | The default C<untaint_pattern> (see above) on Mac OS is set to |
233 | C<qr|^(.+)$|>. Note that the parentheses are vital. |
234 | |
235 | =item * |
236 | |
237 | The invisible system file "Icon\015" is ignored. While this file may |
238 | appear in every directory, there are some more invisible system files |
239 | on every volume, which are all located at the volume root level (i.e. |
240 | "MacintoshHD:"). These system files are B<not> excluded automatically. |
241 | Your filter may use the following code to recognize invisible files or |
242 | directories (requires Mac::Files): |
243 | |
244 | use Mac::Files; |
245 | |
246 | # invisible() -- returns 1 if file/directory is invisible, |
247 | # 0 if it's visible or undef if an error occured |
248 | |
249 | sub invisible($) { |
250 | my $file = shift; |
251 | my ($fileCat, $fileInfo); |
252 | my $invisible_flag = 1 << 14; |
253 | |
254 | if ( $fileCat = FSpGetCatInfo($file) ) { |
255 | if ($fileInfo = $fileCat->ioFlFndrInfo() ) { |
256 | return (($fileInfo->fdFlags & $invisible_flag) && 1); |
257 | } |
258 | } |
259 | return undef; |
260 | } |
261 | |
262 | Generally, invisible files are system files, unless an odd application |
263 | decides to use invisible files for its own purposes. To distinguish |
264 | such files from system files, you have to look at the B<type> and B<creator> |
265 | file attributes. The MacPerl built-in functions C<GetFileInfo(FILE)> and |
266 | C<SetFileInfo(CREATOR, TYPE, FILES)> offer access to these attributes |
267 | (see MacPerl.pm for details). |
268 | |
269 | Files that appear on the desktop actually reside in an (hidden) directory |
270 | named "Desktop Folder" on the particular disk volume. Note that, although |
271 | all desktop files appear to be on the same "virtual" desktop, each disk |
272 | volume actually maintains its own "Desktop Folder" directory. |
273 | |
274 | =back |
275 | |
276 | =back |
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277 | |
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278 | =head1 HISTORY |
279 | |
280 | File::Find used to produce incorrect results if called recursively. |
281 | During the development of perl 5.8 this bug was fixed. |
282 | The first fixed version of File::Find was 1.01. |
283 | |
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284 | =cut |
285 | |
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286 | our @ISA = qw(Exporter); |
287 | our @EXPORT = qw(find finddepth); |
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288 | |
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289 | |
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290 | use strict; |
291 | my $Is_VMS; |
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292 | my $Is_MacOS; |
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293 | |
294 | require File::Basename; |
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295 | require File::Spec; |
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296 | |
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297 | # Should ideally be my() not our() but local() currently |
298 | # refuses to operate on lexicals |
299 | |
300 | our %SLnkSeen; |
301 | our ($wanted_callback, $avoid_nlink, $bydepth, $no_chdir, $follow, |
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302 | $follow_skip, $full_check, $untaint, $untaint_skip, $untaint_pat, |
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303 | $pre_process, $post_process, $dangling_symlinks); |
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304 | |
305 | sub contract_name { |
306 | my ($cdir,$fn) = @_; |
307 | |
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308 | return substr($cdir,0,rindex($cdir,'/')) if $fn eq $File::Find::current_dir; |
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309 | |
310 | $cdir = substr($cdir,0,rindex($cdir,'/')+1); |
311 | |
312 | $fn =~ s|^\./||; |
313 | |
314 | my $abs_name= $cdir . $fn; |
315 | |
316 | if (substr($fn,0,3) eq '../') { |
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317 | 1 while $abs_name =~ s!/[^/]*/\.\./!/!; |
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318 | } |
319 | |
320 | return $abs_name; |
321 | } |
322 | |
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323 | # return the absolute name of a directory or file |
324 | sub contract_name_Mac { |
325 | my ($cdir,$fn) = @_; |
326 | my $abs_name; |
327 | |
328 | if ($fn =~ /^(:+)(.*)$/) { # valid pathname starting with a ':' |
329 | |
330 | my $colon_count = length ($1); |
331 | if ($colon_count == 1) { |
332 | $abs_name = $cdir . $2; |
333 | return $abs_name; |
334 | } |
335 | else { |
336 | # need to move up the tree, but |
337 | # only if it's not a volume name |
338 | for (my $i=1; $i<$colon_count; $i++) { |
339 | unless ($cdir =~ /^[^:]+:$/) { # volume name |
340 | $cdir =~ s/[^:]+:$//; |
341 | } |
342 | else { |
343 | return undef; |
344 | } |
345 | } |
346 | $abs_name = $cdir . $2; |
347 | return $abs_name; |
348 | } |
349 | |
350 | } |
351 | else { |
352 | |
353 | # $fn may be a valid path to a directory or file or (dangling) |
354 | # symlink, without a leading ':' |
355 | if ( (-e $fn) || (-l $fn) ) { |
356 | if ($fn =~ /^[^:]+:/) { # a volume name like DataHD:* |
357 | return $fn; # $fn is already an absolute path |
358 | } |
359 | else { |
360 | $abs_name = $cdir . $fn; |
361 | return $abs_name; |
362 | } |
363 | } |
364 | else { # argh!, $fn is not a valid directory/file |
365 | return undef; |
366 | } |
367 | } |
368 | } |
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369 | |
370 | sub PathCombine($$) { |
371 | my ($Base,$Name) = @_; |
372 | my $AbsName; |
373 | |
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374 | if ($Is_MacOS) { |
375 | # $Name is the resolved symlink (always a full path on MacOS), |
376 | # i.e. there's no need to call contract_name_Mac() |
377 | $AbsName = $Name; |
378 | |
379 | # (simple) check for recursion |
380 | if ( ( $Base =~ /^$AbsName/) && (-d $AbsName) ) { # recursion |
381 | return undef; |
382 | } |
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383 | } |
384 | else { |
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385 | if (substr($Name,0,1) eq '/') { |
386 | $AbsName= $Name; |
387 | } |
388 | else { |
389 | $AbsName= contract_name($Base,$Name); |
390 | } |
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391 | |
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392 | # (simple) check for recursion |
393 | my $newlen= length($AbsName); |
394 | if ($newlen <= length($Base)) { |
395 | if (($newlen == length($Base) || substr($Base,$newlen,1) eq '/') |
396 | && $AbsName eq substr($Base,0,$newlen)) |
397 | { |
398 | return undef; |
399 | } |
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400 | } |
401 | } |
402 | return $AbsName; |
403 | } |
404 | |
405 | sub Follow_SymLink($) { |
406 | my ($AbsName) = @_; |
407 | |
408 | my ($NewName,$DEV, $INO); |
409 | ($DEV, $INO)= lstat $AbsName; |
410 | |
411 | while (-l _) { |
412 | if ($SLnkSeen{$DEV, $INO}++) { |
413 | if ($follow_skip < 2) { |
414 | die "$AbsName is encountered a second time"; |
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415 | } |
416 | else { |
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417 | return undef; |
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418 | } |
419 | } |
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420 | $NewName= PathCombine($AbsName, readlink($AbsName)); |
421 | unless(defined $NewName) { |
422 | if ($follow_skip < 2) { |
423 | die "$AbsName is a recursive symbolic link"; |
424 | } |
425 | else { |
426 | return undef; |
a0d0e21e |
427 | } |
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428 | } |
429 | else { |
430 | $AbsName= $NewName; |
431 | } |
432 | ($DEV, $INO) = lstat($AbsName); |
433 | return undef unless defined $DEV; # dangling symbolic link |
434 | } |
435 | |
436 | if ($full_check && $SLnkSeen{$DEV, $INO}++) { |
7e47e6ff |
437 | if ( ($follow_skip < 1) || ((-d _) && ($follow_skip < 2)) ) { |
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438 | die "$AbsName encountered a second time"; |
439 | } |
440 | else { |
441 | return undef; |
442 | } |
443 | } |
444 | |
445 | return $AbsName; |
446 | } |
447 | |
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448 | our($dir, $name, $fullname, $prune); |
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449 | sub _find_dir_symlnk($$$); |
450 | sub _find_dir($$$); |
451 | |
7e47e6ff |
452 | # check whether or not a scalar variable is tainted |
453 | # (code straight from the Camel, 3rd ed., page 561) |
454 | sub is_tainted_pp { |
455 | my $arg = shift; |
456 | my $nada = substr($arg, 0, 0); # zero-length |
457 | local $@; |
458 | eval { eval "# $nada" }; |
459 | return length($@) != 0; |
460 | } |
461 | |
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462 | sub _find_opt { |
463 | my $wanted = shift; |
464 | die "invalid top directory" unless defined $_[0]; |
465 | |
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466 | # This function must local()ize everything because callbacks may |
467 | # call find() or finddepth() |
468 | |
469 | local %SLnkSeen; |
470 | local ($wanted_callback, $avoid_nlink, $bydepth, $no_chdir, $follow, |
471 | $follow_skip, $full_check, $untaint, $untaint_skip, $untaint_pat, |
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472 | $pre_process, $post_process, $dangling_symlinks); |
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473 | local($dir, $name, $fullname, $prune); |
474 | |
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475 | my $cwd = $wanted->{bydepth} ? Cwd::fastcwd() : Cwd::cwd(); |
476 | my $cwd_untainted = $cwd; |
477 | my $check_t_cwd = 1; |
478 | $wanted_callback = $wanted->{wanted}; |
479 | $bydepth = $wanted->{bydepth}; |
480 | $pre_process = $wanted->{preprocess}; |
481 | $post_process = $wanted->{postprocess}; |
482 | $no_chdir = $wanted->{no_chdir}; |
483 | $full_check = $wanted->{follow}; |
484 | $follow = $full_check || $wanted->{follow_fast}; |
485 | $follow_skip = $wanted->{follow_skip}; |
486 | $untaint = $wanted->{untaint}; |
487 | $untaint_pat = $wanted->{untaint_pattern}; |
488 | $untaint_skip = $wanted->{untaint_skip}; |
489 | $dangling_symlinks = $wanted->{dangling_symlinks}; |
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490 | |
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491 | # for compatability reasons (find.pl, find2perl) |
9f826d6a |
492 | local our ($topdir, $topdev, $topino, $topmode, $topnlink); |
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493 | |
494 | # a symbolic link to a directory doesn't increase the link count |
495 | $avoid_nlink = $follow || $File::Find::dont_use_nlink; |
496 | |
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497 | my ($abs_dir, $Is_Dir); |
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498 | |
499 | Proc_Top_Item: |
500 | foreach my $TOP (@_) { |
7e47e6ff |
501 | my $top_item = $TOP; |
502 | |
503 | if ($Is_MacOS) { |
504 | ($topdev,$topino,$topmode,$topnlink) = $follow ? stat $top_item : lstat $top_item; |
505 | $top_item = ":$top_item" |
3fa6e24b |
506 | if ( (-d _) && ( $top_item !~ /:/ ) ); |
7e47e6ff |
507 | } |
508 | else { |
509 | $top_item =~ s|/\z|| unless $top_item eq '/'; |
510 | ($topdev,$topino,$topmode,$topnlink) = $follow ? stat $top_item : lstat $top_item; |
511 | } |
512 | |
513 | $Is_Dir= 0; |
514 | |
515 | if ($follow) { |
516 | |
517 | if ($Is_MacOS) { |
518 | $cwd = "$cwd:" unless ($cwd =~ /:$/); # for safety |
519 | |
520 | if ($top_item eq $File::Find::current_dir) { |
521 | $abs_dir = $cwd; |
522 | } |
523 | else { |
524 | $abs_dir = contract_name_Mac($cwd, $top_item); |
525 | unless (defined $abs_dir) { |
3fa6e24b |
526 | warn "Can't determine absolute path for $top_item (No such file or directory)\n" if $^W; |
7e47e6ff |
527 | next Proc_Top_Item; |
528 | } |
529 | } |
530 | |
531 | } |
532 | else { |
533 | if (substr($top_item,0,1) eq '/') { |
534 | $abs_dir = $top_item; |
535 | } |
536 | elsif ($top_item eq $File::Find::current_dir) { |
537 | $abs_dir = $cwd; |
538 | } |
539 | else { # care about any ../ |
540 | $abs_dir = contract_name("$cwd/",$top_item); |
541 | } |
542 | } |
543 | $abs_dir= Follow_SymLink($abs_dir); |
544 | unless (defined $abs_dir) { |
80e52b73 |
545 | if ($dangling_symlinks) { |
546 | if (ref $dangling_symlinks eq 'CODE') { |
547 | $dangling_symlinks->($top_item, $cwd); |
548 | } else { |
549 | warn "$top_item is a dangling symbolic link\n" if $^W; |
550 | } |
551 | } |
81793b90 |
552 | next Proc_Top_Item; |
7e47e6ff |
553 | } |
554 | |
555 | if (-d _) { |
81793b90 |
556 | _find_dir_symlnk($wanted, $abs_dir, $top_item); |
557 | $Is_Dir= 1; |
7e47e6ff |
558 | } |
559 | } |
81793b90 |
560 | else { # no follow |
7e47e6ff |
561 | $topdir = $top_item; |
562 | unless (defined $topnlink) { |
3fa6e24b |
563 | warn "Can't stat $top_item: $!\n" if $^W; |
7e47e6ff |
564 | next Proc_Top_Item; |
565 | } |
566 | if (-d _) { |
c7b9dd21 |
567 | $top_item =~ s/\.dir\z// if $Is_VMS; |
e7b91b67 |
568 | _find_dir($wanted, $top_item, $topnlink); |
81793b90 |
569 | $Is_Dir= 1; |
7e47e6ff |
570 | } |
237437d0 |
571 | else { |
81793b90 |
572 | $abs_dir= $top_item; |
7e47e6ff |
573 | } |
574 | } |
81793b90 |
575 | |
7e47e6ff |
576 | unless ($Is_Dir) { |
81793b90 |
577 | unless (($_,$dir) = File::Basename::fileparse($abs_dir)) { |
7e47e6ff |
578 | if ($Is_MacOS) { |
579 | ($dir,$_) = (':', $top_item); # $File::Find::dir, $_ |
580 | } |
581 | else { |
582 | ($dir,$_) = ('./', $top_item); |
583 | } |
81793b90 |
584 | } |
585 | |
7e47e6ff |
586 | $abs_dir = $dir; |
587 | if (( $untaint ) && (is_tainted($dir) )) { |
588 | ( $abs_dir ) = $dir =~ m|$untaint_pat|; |
81793b90 |
589 | unless (defined $abs_dir) { |
590 | if ($untaint_skip == 0) { |
7e47e6ff |
591 | die "directory $dir is still tainted"; |
81793b90 |
592 | } |
593 | else { |
594 | next Proc_Top_Item; |
595 | } |
596 | } |
7e47e6ff |
597 | } |
81793b90 |
598 | |
7e47e6ff |
599 | unless ($no_chdir || chdir $abs_dir) { |
3fa6e24b |
600 | warn "Couldn't chdir $abs_dir: $!\n" if $^W; |
7e47e6ff |
601 | next Proc_Top_Item; |
602 | } |
719911cc |
603 | |
7e47e6ff |
604 | $name = $abs_dir . $_; # $File::Find::name |
719911cc |
605 | |
7e47e6ff |
606 | { &$wanted_callback }; # protect against wild "next" |
81793b90 |
607 | |
7e47e6ff |
608 | } |
81793b90 |
609 | |
7e47e6ff |
610 | unless ( $no_chdir ) { |
611 | if ( ($check_t_cwd) && (($untaint) && (is_tainted($cwd) )) ) { |
612 | ( $cwd_untainted ) = $cwd =~ m|$untaint_pat|; |
613 | unless (defined $cwd_untainted) { |
614 | die "insecure cwd in find(depth)"; |
615 | } |
616 | $check_t_cwd = 0; |
617 | } |
618 | unless (chdir $cwd_untainted) { |
619 | die "Can't cd to $cwd: $!\n"; |
620 | } |
621 | } |
81793b90 |
622 | } |
623 | } |
624 | |
625 | # API: |
626 | # $wanted |
627 | # $p_dir : "parent directory" |
628 | # $nlink : what came back from the stat |
629 | # preconditions: |
630 | # chdir (if not no_chdir) to dir |
631 | |
632 | sub _find_dir($$$) { |
633 | my ($wanted, $p_dir, $nlink) = @_; |
634 | my ($CdLvl,$Level) = (0,0); |
635 | my @Stack; |
636 | my @filenames; |
637 | my ($subcount,$sub_nlink); |
638 | my $SE= []; |
639 | my $dir_name= $p_dir; |
7e47e6ff |
640 | my $dir_pref; |
641 | my $dir_rel; |
642 | my $tainted = 0; |
643 | |
644 | if ($Is_MacOS) { |
645 | $dir_pref= ($p_dir =~ /:$/) ? $p_dir : "$p_dir:"; # preface |
646 | $dir_rel= ':'; # directory name relative to current directory |
647 | } |
648 | else { |
649 | $dir_pref= ( $p_dir eq '/' ? '/' : "$p_dir/" ); |
650 | $dir_rel= '.'; # directory name relative to current directory |
651 | } |
81793b90 |
652 | |
653 | local ($dir, $name, $prune, *DIR); |
7e47e6ff |
654 | |
655 | unless ( $no_chdir || ($p_dir eq $File::Find::current_dir)) { |
81793b90 |
656 | my $udir = $p_dir; |
7e47e6ff |
657 | if (( $untaint ) && (is_tainted($p_dir) )) { |
658 | ( $udir ) = $p_dir =~ m|$untaint_pat|; |
81793b90 |
659 | unless (defined $udir) { |
660 | if ($untaint_skip == 0) { |
661 | die "directory $p_dir is still tainted"; |
662 | } |
663 | else { |
664 | return; |
665 | } |
237437d0 |
666 | } |
a0d0e21e |
667 | } |
81793b90 |
668 | unless (chdir $udir) { |
3fa6e24b |
669 | warn "Can't cd to $udir: $!\n" if $^W; |
81793b90 |
670 | return; |
671 | } |
672 | } |
7e47e6ff |
673 | |
674 | # push the starting directory |
57e73c4b |
675 | push @Stack,[$CdLvl,$p_dir,$dir_rel,-1] if $bydepth; |
81793b90 |
676 | |
7e47e6ff |
677 | if ($Is_MacOS) { |
678 | $p_dir = $dir_pref; # ensure trailing ':' |
679 | } |
680 | |
81793b90 |
681 | while (defined $SE) { |
682 | unless ($bydepth) { |
7e47e6ff |
683 | $dir= $p_dir; # $File::Find::dir |
684 | $name= $dir_name; # $File::Find::name |
685 | $_= ($no_chdir ? $dir_name : $dir_rel ); # $_ |
81793b90 |
686 | # prune may happen here |
7e47e6ff |
687 | $prune= 0; |
688 | { &$wanted_callback }; # protect against wild "next" |
689 | next if $prune; |
81793b90 |
690 | } |
7e47e6ff |
691 | |
81793b90 |
692 | # change to that directory |
7e47e6ff |
693 | unless ($no_chdir || ($dir_rel eq $File::Find::current_dir)) { |
81793b90 |
694 | my $udir= $dir_rel; |
7e47e6ff |
695 | if ( ($untaint) && (($tainted) || ($tainted = is_tainted($dir_rel) )) ) { |
696 | ( $udir ) = $dir_rel =~ m|$untaint_pat|; |
81793b90 |
697 | unless (defined $udir) { |
698 | if ($untaint_skip == 0) { |
7e47e6ff |
699 | if ($Is_MacOS) { |
700 | die "directory ($p_dir) $dir_rel is still tainted"; |
701 | } |
702 | else { |
703 | die "directory (" . ($p_dir ne '/' ? $p_dir : '') . "/) $dir_rel is still tainted"; |
704 | } |
705 | } else { # $untaint_skip == 1 |
706 | next; |
81793b90 |
707 | } |
708 | } |
709 | } |
710 | unless (chdir $udir) { |
7e47e6ff |
711 | if ($Is_MacOS) { |
3fa6e24b |
712 | warn "Can't cd to ($p_dir) $udir: $!\n" if $^W; |
7e47e6ff |
713 | } |
714 | else { |
3fa6e24b |
715 | warn "Can't cd to (" . ($p_dir ne '/' ? $p_dir : '') . "/) $udir: $!\n" if $^W; |
7e47e6ff |
716 | } |
81793b90 |
717 | next; |
718 | } |
719 | $CdLvl++; |
720 | } |
721 | |
7e47e6ff |
722 | if ($Is_MacOS) { |
723 | $dir_name = "$dir_name:" unless ($dir_name =~ /:$/); |
724 | } |
725 | |
726 | $dir= $dir_name; # $File::Find::dir |
81793b90 |
727 | |
728 | # Get the list of files in the current directory. |
7e47e6ff |
729 | unless (opendir DIR, ($no_chdir ? $dir_name : $File::Find::current_dir)) { |
3fa6e24b |
730 | warn "Can't opendir($dir_name): $!\n" if $^W; |
81793b90 |
731 | next; |
732 | } |
733 | @filenames = readdir DIR; |
734 | closedir(DIR); |
719c805e |
735 | @filenames = &$pre_process(@filenames) if $pre_process; |
736 | push @Stack,[$CdLvl,$dir_name,"",-2] if $post_process; |
81793b90 |
737 | |
738 | if ($nlink == 2 && !$avoid_nlink) { |
739 | # This dir has no subdirectories. |
740 | for my $FN (@filenames) { |
7e47e6ff |
741 | next if $FN =~ $File::Find::skip_pattern; |
81793b90 |
742 | |
7e47e6ff |
743 | $name = $dir_pref . $FN; # $File::Find::name |
744 | $_ = ($no_chdir ? $name : $FN); # $_ |
73396e07 |
745 | { &$wanted_callback }; # protect against wild "next" |
81793b90 |
746 | } |
747 | |
748 | } |
749 | else { |
750 | # This dir has subdirectories. |
751 | $subcount = $nlink - 2; |
752 | |
753 | for my $FN (@filenames) { |
7e47e6ff |
754 | next if $FN =~ $File::Find::skip_pattern; |
81793b90 |
755 | if ($subcount > 0 || $avoid_nlink) { |
756 | # Seen all the subdirs? |
757 | # check for directoriness. |
758 | # stat is faster for a file in the current directory |
07867069 |
759 | $sub_nlink = (lstat ($no_chdir ? $dir_pref . $FN : $FN))[3]; |
81793b90 |
760 | |
761 | if (-d _) { |
762 | --$subcount; |
c7b9dd21 |
763 | $FN =~ s/\.dir\z// if $Is_VMS; |
81793b90 |
764 | push @Stack,[$CdLvl,$dir_name,$FN,$sub_nlink]; |
765 | } |
766 | else { |
7e47e6ff |
767 | $name = $dir_pref . $FN; # $File::Find::name |
768 | $_= ($no_chdir ? $name : $FN); # $_ |
73396e07 |
769 | { &$wanted_callback }; # protect against wild "next" |
81793b90 |
770 | } |
771 | } |
07867069 |
772 | else { |
7e47e6ff |
773 | $name = $dir_pref . $FN; # $File::Find::name |
774 | $_= ($no_chdir ? $name : $FN); # $_ |
73396e07 |
775 | { &$wanted_callback }; # protect against wild "next" |
81793b90 |
776 | } |
777 | } |
778 | } |
17b275ff |
779 | } |
780 | continue { |
57e73c4b |
781 | while ( defined ($SE = pop @Stack) ) { |
81793b90 |
782 | ($Level, $p_dir, $dir_rel, $nlink) = @$SE; |
783 | if ($CdLvl > $Level && !$no_chdir) { |
7e47e6ff |
784 | my $tmp; |
785 | if ($Is_MacOS) { |
786 | $tmp = (':' x ($CdLvl-$Level)) . ':'; |
787 | } |
788 | else { |
789 | $tmp = join('/',('..') x ($CdLvl-$Level)); |
790 | } |
791 | die "Can't cd to $dir_name" . $tmp |
792 | unless chdir ($tmp); |
81793b90 |
793 | $CdLvl = $Level; |
794 | } |
7e47e6ff |
795 | |
796 | if ($Is_MacOS) { |
797 | # $pdir always has a trailing ':', except for the starting dir, |
798 | # where $dir_rel eq ':' |
799 | $dir_name = "$p_dir$dir_rel"; |
800 | $dir_pref = "$dir_name:"; |
801 | } |
802 | else { |
803 | $dir_name = ($p_dir eq '/' ? "/$dir_rel" : "$p_dir/$dir_rel"); |
804 | $dir_pref = "$dir_name/"; |
805 | } |
806 | |
719c805e |
807 | if ( $nlink == -2 ) { |
7e47e6ff |
808 | $name = $dir = $p_dir; # $File::Find::name / dir |
809 | if ($Is_MacOS) { |
810 | $_ = ':'; # $_ |
811 | } |
812 | else { |
813 | $_ = '.'; |
814 | } |
719c805e |
815 | &$post_process; # End-of-directory processing |
7e47e6ff |
816 | } |
817 | elsif ( $nlink < 0 ) { # must be finddepth, report dirname now |
818 | $name = $dir_name; |
819 | if ($Is_MacOS) { |
820 | if ($dir_rel eq ':') { # must be the top dir, where we started |
821 | $name =~ s|:$||; # $File::Find::name |
822 | $p_dir = "$p_dir:" unless ($p_dir =~ /:$/); |
823 | } |
824 | $dir = $p_dir; # $File::Find::dir |
825 | $_ = ($no_chdir ? $name : $dir_rel); # $_ |
826 | } |
827 | else { |
828 | if ( substr($name,-2) eq '/.' ) { |
829 | $name =~ s|/\.$||; |
830 | } |
831 | $dir = $p_dir; |
832 | $_ = ($no_chdir ? $dir_name : $dir_rel ); |
833 | if ( substr($_,-2) eq '/.' ) { |
834 | s|/\.$||; |
835 | } |
836 | } |
837 | { &$wanted_callback }; # protect against wild "next" |
838 | } |
839 | else { |
840 | push @Stack,[$CdLvl,$p_dir,$dir_rel,-1] if $bydepth; |
841 | last; |
842 | } |
81793b90 |
843 | } |
a0d0e21e |
844 | } |
845 | } |
846 | |
81793b90 |
847 | |
848 | # API: |
849 | # $wanted |
850 | # $dir_loc : absolute location of a dir |
851 | # $p_dir : "parent directory" |
852 | # preconditions: |
853 | # chdir (if not no_chdir) to dir |
854 | |
855 | sub _find_dir_symlnk($$$) { |
7e47e6ff |
856 | my ($wanted, $dir_loc, $p_dir) = @_; # $dir_loc is the absolute directory |
81793b90 |
857 | my @Stack; |
858 | my @filenames; |
859 | my $new_loc; |
7e47e6ff |
860 | my $updir_loc = $dir_loc; # untainted parent directory |
81793b90 |
861 | my $SE = []; |
862 | my $dir_name = $p_dir; |
7e47e6ff |
863 | my $dir_pref; |
864 | my $loc_pref; |
865 | my $dir_rel; |
866 | my $byd_flag; # flag for pending stack entry if $bydepth |
867 | my $tainted = 0; |
868 | my $ok = 1; |
869 | |
870 | if ($Is_MacOS) { |
871 | $dir_pref = ($p_dir =~ /:$/) ? "$p_dir" : "$p_dir:"; |
872 | $loc_pref = ($dir_loc =~ /:$/) ? "$dir_loc" : "$dir_loc:"; |
873 | $dir_rel = ':'; # directory name relative to current directory |
874 | } else { |
875 | $dir_pref = ( $p_dir eq '/' ? '/' : "$p_dir/" ); |
876 | $loc_pref = ( $dir_loc eq '/' ? '/' : "$dir_loc/" ); |
877 | $dir_rel = '.'; # directory name relative to current directory |
878 | } |
81793b90 |
879 | |
880 | local ($dir, $name, $fullname, $prune, *DIR); |
7e47e6ff |
881 | |
882 | unless ($no_chdir) { |
883 | # untaint the topdir |
884 | if (( $untaint ) && (is_tainted($dir_loc) )) { |
885 | ( $updir_loc ) = $dir_loc =~ m|$untaint_pat|; # parent dir, now untainted |
886 | # once untainted, $updir_loc is pushed on the stack (as parent directory); |
887 | # hence, we don't need to untaint the parent directory every time we chdir |
888 | # to it later |
889 | unless (defined $updir_loc) { |
81793b90 |
890 | if ($untaint_skip == 0) { |
891 | die "directory $dir_loc is still tainted"; |
892 | } |
893 | else { |
894 | return; |
895 | } |
896 | } |
897 | } |
7e47e6ff |
898 | $ok = chdir($updir_loc) unless ($p_dir eq $File::Find::current_dir); |
899 | unless ($ok) { |
3fa6e24b |
900 | warn "Can't cd to $updir_loc: $!\n" if $^W; |
81793b90 |
901 | return; |
902 | } |
903 | } |
904 | |
7e47e6ff |
905 | push @Stack,[$dir_loc,$updir_loc,$p_dir,$dir_rel,-1] if $bydepth; |
906 | |
907 | if ($Is_MacOS) { |
908 | $p_dir = $dir_pref; # ensure trailing ':' |
909 | } |
57e73c4b |
910 | |
81793b90 |
911 | while (defined $SE) { |
912 | |
913 | unless ($bydepth) { |
7e47e6ff |
914 | # change (back) to parent directory (always untainted) |
704ea872 |
915 | unless ($no_chdir) { |
7e47e6ff |
916 | unless (chdir $updir_loc) { |
3fa6e24b |
917 | warn "Can't cd to $updir_loc: $!\n" if $^W; |
704ea872 |
918 | next; |
919 | } |
920 | } |
7e47e6ff |
921 | $dir= $p_dir; # $File::Find::dir |
922 | $name= $dir_name; # $File::Find::name |
923 | $_= ($no_chdir ? $dir_name : $dir_rel ); # $_ |
924 | $fullname= $dir_loc; # $File::Find::fullname |
81793b90 |
925 | # prune may happen here |
7e47e6ff |
926 | $prune= 0; |
704ea872 |
927 | lstat($_); # make sure file tests with '_' work |
7e47e6ff |
928 | { &$wanted_callback }; # protect against wild "next" |
929 | next if $prune; |
81793b90 |
930 | } |
931 | |
932 | # change to that directory |
7e47e6ff |
933 | unless ($no_chdir || ($dir_rel eq $File::Find::current_dir)) { |
934 | $updir_loc = $dir_loc; |
935 | if ( ($untaint) && (($tainted) || ($tainted = is_tainted($dir_loc) )) ) { |
936 | # untaint $dir_loc, what will be pushed on the stack as (untainted) parent dir |
937 | ( $updir_loc ) = $dir_loc =~ m|$untaint_pat|; |
938 | unless (defined $updir_loc) { |
81793b90 |
939 | if ($untaint_skip == 0) { |
940 | die "directory $dir_loc is still tainted"; |
a0d0e21e |
941 | } |
237437d0 |
942 | else { |
81793b90 |
943 | next; |
237437d0 |
944 | } |
a0d0e21e |
945 | } |
946 | } |
7e47e6ff |
947 | unless (chdir $updir_loc) { |
3fa6e24b |
948 | warn "Can't cd to $updir_loc: $!\n" if $^W; |
81793b90 |
949 | next; |
950 | } |
951 | } |
952 | |
7e47e6ff |
953 | if ($Is_MacOS) { |
954 | $dir_name = "$dir_name:" unless ($dir_name =~ /:$/); |
955 | } |
956 | |
957 | $dir = $dir_name; # $File::Find::dir |
81793b90 |
958 | |
959 | # Get the list of files in the current directory. |
7e47e6ff |
960 | unless (opendir DIR, ($no_chdir ? $dir_loc : $File::Find::current_dir)) { |
3fa6e24b |
961 | warn "Can't opendir($dir_loc): $!\n" if $^W; |
81793b90 |
962 | next; |
963 | } |
964 | @filenames = readdir DIR; |
965 | closedir(DIR); |
966 | |
967 | for my $FN (@filenames) { |
7e47e6ff |
968 | next if $FN =~ $File::Find::skip_pattern; |
81793b90 |
969 | |
970 | # follow symbolic links / do an lstat |
07867069 |
971 | $new_loc = Follow_SymLink($loc_pref.$FN); |
81793b90 |
972 | |
973 | # ignore if invalid symlink |
974 | next unless defined $new_loc; |
7e47e6ff |
975 | |
81793b90 |
976 | if (-d _) { |
7e47e6ff |
977 | push @Stack,[$new_loc,$updir_loc,$dir_name,$FN,1]; |
81793b90 |
978 | } |
979 | else { |
7e47e6ff |
980 | $fullname = $new_loc; # $File::Find::fullname |
981 | $name = $dir_pref . $FN; # $File::Find::name |
982 | $_ = ($no_chdir ? $name : $FN); # $_ |
73396e07 |
983 | { &$wanted_callback }; # protect against wild "next" |
81793b90 |
984 | } |
985 | } |
986 | |
81793b90 |
987 | } |
988 | continue { |
57e73c4b |
989 | while (defined($SE = pop @Stack)) { |
7e47e6ff |
990 | ($dir_loc, $updir_loc, $p_dir, $dir_rel, $byd_flag) = @$SE; |
991 | if ($Is_MacOS) { |
992 | # $p_dir always has a trailing ':', except for the starting dir, |
993 | # where $dir_rel eq ':' |
994 | $dir_name = "$p_dir$dir_rel"; |
995 | $dir_pref = "$dir_name:"; |
996 | $loc_pref = ($dir_loc =~ /:$/) ? $dir_loc : "$dir_loc:"; |
997 | } |
998 | else { |
999 | $dir_name = ($p_dir eq '/' ? "/$dir_rel" : "$p_dir/$dir_rel"); |
1000 | $dir_pref = "$dir_name/"; |
1001 | $loc_pref = "$dir_loc/"; |
1002 | } |
1003 | if ( $byd_flag < 0 ) { # must be finddepth, report dirname now |
1004 | unless ($no_chdir || ($dir_rel eq $File::Find::current_dir)) { |
1005 | unless (chdir $updir_loc) { # $updir_loc (parent dir) is always untainted |
3fa6e24b |
1006 | warn "Can't cd to $updir_loc: $!\n" if $^W; |
7e47e6ff |
1007 | next; |
1008 | } |
1009 | } |
1010 | $fullname = $dir_loc; # $File::Find::fullname |
1011 | $name = $dir_name; # $File::Find::name |
1012 | if ($Is_MacOS) { |
1013 | if ($dir_rel eq ':') { # must be the top dir, where we started |
1014 | $name =~ s|:$||; # $File::Find::name |
1015 | $p_dir = "$p_dir:" unless ($p_dir =~ /:$/); |
1016 | } |
1017 | $dir = $p_dir; # $File::Find::dir |
1018 | $_ = ($no_chdir ? $name : $dir_rel); # $_ |
1019 | } |
1020 | else { |
1021 | if ( substr($name,-2) eq '/.' ) { |
1022 | $name =~ s|/\.$||; # $File::Find::name |
1023 | } |
1024 | $dir = $p_dir; # $File::Find::dir |
1025 | $_ = ($no_chdir ? $dir_name : $dir_rel); # $_ |
1026 | if ( substr($_,-2) eq '/.' ) { |
1027 | s|/\.$||; |
1028 | } |
1029 | } |
1030 | |
1031 | lstat($_); # make sure file tests with '_' work |
1032 | { &$wanted_callback }; # protect against wild "next" |
1033 | } |
1034 | else { |
1035 | push @Stack,[$dir_loc, $updir_loc, $p_dir, $dir_rel,-1] if $bydepth; |
1036 | last; |
1037 | } |
a0d0e21e |
1038 | } |
1039 | } |
1040 | } |
1041 | |
81793b90 |
1042 | |
20408e3c |
1043 | sub wrap_wanted { |
81793b90 |
1044 | my $wanted = shift; |
1045 | if ( ref($wanted) eq 'HASH' ) { |
1046 | if ( $wanted->{follow} || $wanted->{follow_fast}) { |
1047 | $wanted->{follow_skip} = 1 unless defined $wanted->{follow_skip}; |
1048 | } |
1049 | if ( $wanted->{untaint} ) { |
7e47e6ff |
1050 | $wanted->{untaint_pattern} = $File::Find::untaint_pattern |
81793b90 |
1051 | unless defined $wanted->{untaint_pattern}; |
1052 | $wanted->{untaint_skip} = 0 unless defined $wanted->{untaint_skip}; |
1053 | } |
1054 | return $wanted; |
1055 | } |
1056 | else { |
1057 | return { wanted => $wanted }; |
1058 | } |
a0d0e21e |
1059 | } |
1060 | |
20408e3c |
1061 | sub find { |
81793b90 |
1062 | my $wanted = shift; |
1063 | _find_opt(wrap_wanted($wanted), @_); |
a0d0e21e |
1064 | } |
1065 | |
55d729e4 |
1066 | sub finddepth { |
81793b90 |
1067 | my $wanted = wrap_wanted(shift); |
1068 | $wanted->{bydepth} = 1; |
1069 | _find_opt($wanted, @_); |
20408e3c |
1070 | } |
6280b799 |
1071 | |
7e47e6ff |
1072 | # default |
1073 | $File::Find::skip_pattern = qr/^\.{1,2}\z/; |
1074 | $File::Find::untaint_pattern = qr|^([-+@\w./]+)$|; |
1075 | |
6280b799 |
1076 | # These are hard-coded for now, but may move to hint files. |
10eba763 |
1077 | if ($^O eq 'VMS') { |
81793b90 |
1078 | $Is_VMS = 1; |
7e47e6ff |
1079 | $File::Find::dont_use_nlink = 1; |
1080 | } |
1081 | elsif ($^O eq 'MacOS') { |
1082 | $Is_MacOS = 1; |
1083 | $File::Find::dont_use_nlink = 1; |
1084 | $File::Find::skip_pattern = qr/^Icon\015\z/; |
1085 | $File::Find::untaint_pattern = qr|^(.+)$|; |
748a9306 |
1086 | } |
1087 | |
7e47e6ff |
1088 | # this _should_ work properly on all platforms |
1089 | # where File::Find can be expected to work |
1090 | $File::Find::current_dir = File::Spec->curdir || '.'; |
1091 | |
81793b90 |
1092 | $File::Find::dont_use_nlink = 1 |
497711e7 |
1093 | if $^O eq 'os2' || $^O eq 'dos' || $^O eq 'amigaos' || $^O eq 'MSWin32' || |
2986a63f |
1094 | $^O eq 'cygwin' || $^O eq 'epoc' || $^O eq 'NetWare'; |
6280b799 |
1095 | |
20408e3c |
1096 | # Set dont_use_nlink in your hint file if your system's stat doesn't |
1097 | # report the number of links in a directory as an indication |
1098 | # of the number of files. |
1099 | # See, e.g. hints/machten.sh for MachTen 2.2. |
81793b90 |
1100 | unless ($File::Find::dont_use_nlink) { |
1101 | require Config; |
1102 | $File::Find::dont_use_nlink = 1 if ($Config::Config{'dont_use_nlink'}); |
20408e3c |
1103 | } |
1104 | |
7e47e6ff |
1105 | # We need a function that checks if a scalar is tainted. Either use the |
1106 | # Scalar::Util module's tainted() function or our (slower) pure Perl |
1107 | # fallback is_tainted_pp() |
1108 | { |
1109 | local $@; |
1110 | eval { require Scalar::Util }; |
1111 | *is_tainted = $@ ? \&is_tainted_pp : \&Scalar::Util::tainted; |
1112 | } |
1113 | |
a0d0e21e |
1114 | 1; |