source: trunk/gsdl/perllib/util.pm@ 2795

Last change on this file since 2795 was 2795, checked in by sjboddie, 23 years ago

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1###########################################################################
2#
3# util.pm -- various useful utilities
4# A component of the Greenstone digital library software
5# from the New Zealand Digital Library Project at the
6# University of Waikato, New Zealand.
7#
8# Copyright (C) 1999 New Zealand Digital Library Project
9#
10# This program is free software; you can redistribute it and/or modify
11# it under the terms of the GNU General Public License as published by
12# the Free Software Foundation; either version 2 of the License, or
13# (at your option) any later version.
14#
15# This program is distributed in the hope that it will be useful,
16# but WITHOUT ANY WARRANTY; without even the implied warranty of
17# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18# GNU General Public License for more details.
19#
20# You should have received a copy of the GNU General Public License
21# along with this program; if not, write to the Free Software
22# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23#
24###########################################################################
25
26package util;
27
28use File::Copy;
29use File::Basename;
30
31
32# removes files (but not directories)
33sub rm {
34 my (@files) = @_;
35 my @filefiles = ();
36
37 # make sure the files we want to delete exist
38 # and are regular files
39 foreach $file (@files) {
40 if (!-e $file) {
41 print STDERR "util::rm $file does not exist\n";
42 } elsif ((!-f $file) && (!-l $file)) {
43 print STDERR "util::rm $file is not a regular (or symbolic) file\n";
44 } else {
45 push (@filefiles, $file);
46 }
47 }
48
49 # remove the files
50 my $numremoved = unlink @filefiles;
51
52 # check to make sure all of them were removed
53 if ($numremoved != scalar(@filefiles)) {
54 print STDERR "util::rm Not all files were removed\n";
55 }
56}
57
58
59# recursive removal
60sub rm_r {
61 my (@files) = @_;
62
63 # recursively remove the files
64 foreach $file (@files) {
65 $file =~ s/[\/\\]+$//; # remove trailing slashes
66
67 if (!-e $file) {
68 print STDERR "util::rm_r $file does not exist\n";
69
70 } elsif ((-d $file) && (!-l $file)) { # don't recurse down symbolic link
71 # get the contents of this directory
72 if (!opendir (INDIR, $file)) {
73 print STDERR "util::rm_r could not open directory $file\n";
74 } else {
75 my @filedir = grep (!/^\.\.?$/, readdir (INDIR));
76 closedir (INDIR);
77
78 # remove all the files in this directory
79 &rm_r (map {$_="$file/$_";} @filedir);
80
81 # remove this directory
82 if (!rmdir $file) {
83 print STDERR "util::rm_r couldn't remove directory $file\n";
84 }
85 }
86
87 } else {
88 # remove this file
89 &rm ($file);
90 }
91 }
92}
93
94# moves a file or a group of files
95sub mv {
96 my $dest = pop (@_);
97 my (@srcfiles) = @_;
98
99 # remove trailing slashes from source and destination files
100 $dest =~ s/[\\\/]+$//;
101 map {$_ =~ s/[\\\/]+$//;} @srcfiles;
102
103 # a few sanity checks
104 if (scalar (@srcfiles) == 0) {
105 print STDERR "util::mv no destination directory given\n";
106 return;
107 } elsif ((scalar (@srcfiles) > 1) && (!-d $dest)) {
108 print STDERR "util::mv if multiple source files are given the ".
109 "destination must be a directory\n";
110 return;
111 }
112
113 # move the files
114 foreach $file (@srcfiles) {
115 my $tempdest = $dest;
116 if (-d $tempdest) {
117 my ($filename) = $file =~ /([^\\\/]+)$/;
118 $tempdest .= "/$filename";
119 }
120 if (!-e $file) {
121 print STDERR "util::mv $file does not exist\n";
122 } else {
123 rename ($file, $tempdest);
124 }
125 }
126}
127
128
129# copies a file or a group of files
130sub cp {
131 my $dest = pop (@_);
132 my (@srcfiles) = @_;
133
134 # remove trailing slashes from source and destination files
135 $dest =~ s/[\\\/]+$//;
136 map {$_ =~ s/[\\\/]+$//;} @srcfiles;
137
138 # a few sanity checks
139 if (scalar (@srcfiles) == 0) {
140 print STDERR "util::cp no destination directory given\n";
141 return;
142 } elsif ((scalar (@srcfiles) > 1) && (!-d $dest)) {
143 print STDERR "util::cp if multiple source files are given the ".
144 "destination must be a directory\n";
145 return;
146 }
147
148 # copy the files
149 foreach $file (@srcfiles) {
150 my $tempdest = $dest;
151 if (-d $tempdest) {
152 my ($filename) = $file =~ /([^\\\/]+)$/;
153 $tempdest .= "/$filename";
154 }
155 if (!-e $file) {
156 print STDERR "util::cp $file does not exist\n";
157 } elsif (!-f $file) {
158 print STDERR "util::cp $file is not a plain file\n";
159 } else {
160 &File::Copy::copy ($file, $tempdest);
161 }
162 }
163}
164
165
166
167# recursively copies a file or group of files
168# syntax: cp_r (sourcefiles, destination directory)
169# destination must be a directory - to copy one file to
170# another use cp instead
171sub cp_r {
172 my $dest = pop (@_);
173 my (@srcfiles) = @_;
174
175 # a few sanity checks
176 if (scalar (@srcfiles) == 0) {
177 print STDERR "util::cp_r no destination directory given\n";
178 return;
179 } elsif (-f $dest) {
180 print STDERR "util::cp_r destination must be a directory\n";
181 return;
182 }
183
184 # create destination directory if it doesn't exist already
185 if (! -d $dest) {
186 my $store_umask = umask(0002);
187 mkdir ($dest, 0777);
188 umask($store_umask);
189 }
190
191 # copy the files
192 foreach $file (@srcfiles) {
193
194 if (!-e $file) {
195 print STDERR "util::cp_r $file does not exist\n";
196
197 } elsif (-d $file) {
198 # make the new directory
199 my ($filename) = $file =~ /([^\\\/]*)$/;
200 $dest = &util::filename_cat ($dest, $filename);
201 my $store_umask = umask(0002);
202 mkdir ($dest, 0777);
203 umask($store_umask);
204
205 # get the contents of this directory
206 if (!opendir (INDIR, $file)) {
207 print STDERR "util::cp_r could not open directory $file\n";
208 } else {
209 my @filedir = readdir (INDIR);
210 closedir (INDIR);
211 foreach $f (@filedir) {
212 next if $f =~ /^\.\.?$/;
213 # copy all the files in this directory
214 my $ff = &util::filename_cat ($file, $f);
215 &cp_r ($ff, $dest);
216 }
217 }
218
219 } else {
220 &cp($file, $dest);
221 }
222 }
223}
224
225
226sub mk_dir {
227 my ($dir) = @_;
228
229 my $store_umask = umask(0002);
230 my $mkdir_ok = mkdir ($dir, 0777);
231 umask($store_umask);
232
233 if (!$mkdir_ok)
234 {
235 print STDERR "util::mk_dir could not create directory $dir\n";
236 return;
237 }
238}
239
240# in case anyone cares - I did some testing (using perls Benchmark module)
241# on this subroutine against File::Path::mkpath (). mk_all_dir() is apparently
242# slightly faster (surprisingly) - Stefan.
243sub mk_all_dir {
244 my ($dir) = @_;
245
246 # use / for the directory separator, remove duplicate and
247 # trailing slashes
248 $dir=~s/[\\\/]+/\//g;
249 $dir=~s/[\\\/]+$//;
250
251 # make sure the cache directory exists
252 my $dirsofar = "";
253 my $first = 1;
254 foreach $dirname (split ("/", $dir)) {
255 $dirsofar .= "/" unless $first;
256 $first = 0;
257
258 $dirsofar .= $dirname;
259
260 next if $dirname =~ /^(|[a-z]:)$/i;
261 if (!-e $dirsofar)
262 {
263 my $store_umask = umask(0002);
264 my $mkdir_ok = mkdir ($dirsofar, 0777);
265 umask($store_umask);
266 if (!$mkdir_ok)
267 {
268 print STDERR "util::mk_all_dir could not create directory $dirsofar\n";
269 return;
270 }
271 }
272 }
273}
274
275# make hard link to file if supported by OS, otherwise copy the file
276sub hard_link {
277 my ($src, $dest) = @_;
278
279 # remove trailing slashes from source and destination files
280 $src =~ s/[\\\/]+$//;
281 $dest =~ s/[\\\/]+$//;
282
283 # a few sanity checks
284 if (-e $dest) {
285 # destination file already exists
286 return;
287 }
288 elsif (!-e $src) {
289 print STDERR "util::hard_link source file $src does not exist\n";
290 return;
291 }
292 elsif (-d $src) {
293 print STDERR "util::hard_link source $src is a directory\n";
294 return;
295 }
296
297 my $dest_dir = &File::Basename::dirname($dest);
298 mk_all_dir($dest_dir) if (!-e $dest_dir);
299
300 # link not supported on windows
301 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
302 &File::Copy::copy ($src, $dest);
303
304 } elsif (!link($src, $dest)) {
305 print STDERR "util::hard_link: unable to create hard link. ";
306 print STDERR " Attempting to copy file: $src -> $dest\n";
307 &File::Copy::copy ($src, $dest);
308 }
309}
310
311# make soft link to file if supported by OS, otherwise copy file
312sub soft_link {
313 my ($src, $dest) = @_;
314
315 # remove trailing slashes from source and destination files
316 $src =~ s/[\\\/]+$//;
317 $dest =~ s/[\\\/]+$//;
318
319 # a few sanity checks
320 if (!-e $src) {
321 print STDERR "util::soft_link source file $src does not exist\n";
322 return 0;
323 }
324
325 my $dest_dir = &File::Basename::dirname($dest);
326 mk_all_dir($dest_dir) if (!-e $dest_dir);
327
328 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
329 # symlink not supported on windows
330 &File::Copy::copy ($src, $dest);
331
332 } elsif (!eval {symlink($src, $dest)}) {
333 print STDERR "util::soft_link: unable to create soft link.";
334 return 0;
335 }
336
337 return 1;
338}
339
340
341
342
343# updates a copy of a directory in some other part of the filesystem
344# verbosity settings are: 0=low, 1=normal, 2=high
345# both $fromdir and $todir should be absolute paths
346sub cachedir {
347 my ($fromdir, $todir, $verbosity) = @_;
348 $verbosity = 1 unless defined $verbosity;
349
350 # use / for the directory separator, remove duplicate and
351 # trailing slashes
352 $fromdir=~s/[\\\/]+/\//g;
353 $fromdir=~s/[\\\/]+$//;
354 $todir=~s/[\\\/]+/\//g;
355 $todir=~s/[\\\/]+$//;
356
357 &mk_all_dir ($todir);
358
359 # get the directories in ascending order
360 if (!opendir (FROMDIR, $fromdir)) {
361 print STDERR "util::cachedir could not read directory $fromdir\n";
362 return;
363 }
364 my @fromdir = grep (!/^\.\.?$/, sort(readdir (FROMDIR)));
365 closedir (FROMDIR);
366
367 if (!opendir (TODIR, $todir)) {
368 print STDERR "util::cacedir could not read directory $todir\n";
369 return;
370 }
371 my @todir = grep (!/^\.\.?$/, sort(readdir (TODIR)));
372 closedir (TODIR);
373
374 my $fromi = 0;
375 my $toi = 0;
376
377 while ($fromi < scalar(@fromdir) || $toi < scalar(@todir)) {
378# print "fromi: $fromi toi: $toi\n";
379
380 # see if we should delete a file/directory
381 # this should happen if the file/directory
382 # is not in the from list or if its a different
383 # size, or has an older timestamp
384 if ($toi < scalar(@todir)) {
385 if (($fromi >= scalar(@fromdir)) ||
386 ($todir[$toi] lt $fromdir[$fromi] ||
387 ($todir[$toi] eq $fromdir[$fromi] &&
388 &differentfiles("$fromdir/$fromdir[$fromi]","$todir/$todir[$toi]",
389 $verbosity)))) {
390
391 # the files are different
392 &rm_r("$todir/$todir[$toi]");
393 splice(@todir, $toi, 1); # $toi stays the same
394
395 } elsif ($todir[$toi] eq $fromdir[$fromi]) {
396 # the files are the same
397 # if it is a directory, check its contents
398 if (-d "$todir/$todir[$toi]") {
399 &cachedir ("$fromdir/$fromdir[$fromi]",
400 "$todir/$todir[$toi]", $verbosity);
401 }
402
403 $toi++;
404 $fromi++;
405 next;
406 }
407 }
408
409 # see if we should insert a file/directory
410 # we should insert a file/directory if there
411 # is no tofiles left or if the tofile does not exist
412 if ($fromi < scalar(@fromdir) && ($toi >= scalar(@todir) ||
413 $todir[$toi] gt $fromdir[$fromi])) {
414 &cp_r ("$fromdir/$fromdir[$fromi]", "$todir/$fromdir[$fromi]");
415 splice (@todir, $toi, 0, $fromdir[$fromi]);
416
417 $toi++;
418 $fromi++;
419 }
420 }
421}
422
423# this function returns -1 if either file is not found
424# assumes that $file1 and $file2 are absolute file names or
425# in the current directory
426# $file2 is allowed to be newer than $file1
427sub differentfiles {
428 my ($file1, $file2, $verbosity) = @_;
429 $verbosity = 1 unless defined $verbosity;
430
431 $file1 =~ s/\/+$//;
432 $file2 =~ s/\/+$//;
433
434 my ($file1name) = $file1 =~ /\/([^\/]*)$/;
435 my ($file2name) = $file2 =~ /\/([^\/]*)$/;
436
437 return -1 unless (-e $file1 && -e $file2);
438 if ($file1name ne $file2name) {
439 print STDERR "filenames are not the same\n" if ($verbosity >= 2);
440 return 1;
441 }
442
443 @file1stat = stat ($file1);
444 @file2stat = stat ($file2);
445
446 if (-d $file1) {
447 if (! -d $file2) {
448 print STDERR "one file is a directory\n" if ($verbosity >= 2);
449 return 1;
450 }
451 return 0;
452 }
453
454 # both must be regular files
455 unless (-f $file1 && -f $file2) {
456 print STDERR "one file is not a regular file\n" if ($verbosity >= 2);
457 return 1;
458 }
459
460 # the size of the files must be the same
461 if ($file1stat[7] != $file2stat[7]) {
462 print STDERR "different sized files\n" if ($verbosity >= 2);
463 return 1;
464 }
465
466 # the second file cannot be older than the first
467 if ($file1stat[9] > $file2stat[9]) {
468 print STDERR "file is older\n" if ($verbosity >= 2);
469 return 1;
470 }
471
472 return 0;
473}
474
475
476sub get_tmp_filename {
477 my $tmpdir = filename_cat($ENV{'GSDLHOME'}, "tmp");
478 &mk_all_dir ($tmpdir) unless -e $tmpdir;
479
480 my $count = 1000;
481 my $rand = int(rand $count);
482 while (-e &filename_cat($tmpdir, "F$rand")) {
483 $rand = int(rand $count);
484 $count++;
485 }
486
487 return filename_cat($tmpdir, "F$rand");
488}
489
490
491sub filename_cat {
492 my (@filenames) = @_;
493 my $filename = join("/", @filenames);
494
495 # remove duplicate slashes and remove the last slash
496 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
497 $filename =~ s/[\\\/]+/\\/g;
498 } else {
499 $filename =~ s/[\/]+/\//g;
500 # DB: want a filename abc\de.html to remain like this
501 }
502 $filename =~ s/[\\\/]$//;
503
504 return $filename;
505}
506
507# returns 1 if filename1 and filename2 point to the same
508# file or directory
509sub filenames_equal {
510 my ($filename1, $filename2) = @_;
511
512 # use filename_cat to clean up trailing slashes and
513 # multiple slashes
514 $filename1 = filename_cat ($filename1);
515 $filename2 = filename_cat ($filename2);
516
517 # filenames not case sensitive on windows
518 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
519 $filename1 =~ tr/[A-Z]/[a-z]/;
520 $filename2 =~ tr/[A-Z]/[a-z]/;
521 }
522 return 1 if $filename1 eq $filename2;
523 return 0;
524}
525
526sub get_os_dirsep {
527
528 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
529 return "\\\\";
530 } else {
531 return "\\\/";
532 }
533}
534
535sub get_re_dirsep {
536
537 return "\\\\|\\\/";
538}
539
540
541# if this is running on windows we want binaries to end in
542# .exe, otherwise they don't have to end in any extension
543sub get_os_exe {
544 return ".exe" if $ENV{'GSDLOS'} =~ /^windows$/i;
545 return "";
546}
547
548
549# test to see whether this is a big or little endian machine
550sub is_little_endian {
551 return (ord(substr(pack("s",1), 0, 1)) == 1);
552}
553
554
555# will return the collection name if successful, "" otherwise
556sub use_collection {
557 my ($collection, $collectdir) = @_;
558
559 if (!defined $collectdir || $collectdir eq "") {
560 $collectdir = &filename_cat ($ENV{'GSDLHOME'}, "collect");
561 }
562
563 # get and check the collection
564 if (!defined($collection) || $collection eq "") {
565 if (defined $ENV{'GSDLCOLLECTION'}) {
566 $collection = $ENV{'GSDLCOLLECTION'};
567 } else {
568 print STDOUT "No collection specified\n";
569 return "";
570 }
571 }
572
573 if ($collection eq "modelcol") {
574 print STDOUT "You can't use modelcol.\n";
575 return "";
576 }
577
578 # make sure the environment variables GSDLCOLLECTION and GSDLCOLLECTDIR
579 # are defined
580 $ENV{'GSDLCOLLECTION'} = $collection unless defined $ENV{'GSDLCOLLECTION'};
581 $ENV{'GSDLCOLLECTDIR'} = &filename_cat ($collectdir, $collection);
582
583 # make sure this collection exists
584 if (!-e $ENV{'GSDLCOLLECTDIR'}) {
585 print STDOUT "Invalid collection ($collection).\n";
586 return "";
587 }
588
589 # everything is ready to go
590 return $collection;
591}
592
5931;
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