source: gsdl/trunk/perllib/util.pm@ 14365

Last change on this file since 14365 was 14365, checked in by qq6, 17 years ago

the hard_link on windows didn't work, get back to the old version
  • Property svn:keywords set to Author Date Id Revision
File size: 19.0 KB
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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 my $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
60# recursive removal
61sub filtered_rm_r {
62 my ($files,$file_accept_re,$file_reject_re) = @_;
63
64 my @files_array = (ref $files eq "ARRAY") ? @$files : ($files);
65
66 # recursively remove the files
67 foreach my $file (@files_array) {
68 $file =~ s/[\/\\]+$//; # remove trailing slashes
69
70 if (!-e $file) {
71 print STDERR "util::filtered_rm_r $file does not exist\n";
72
73 } elsif ((-d $file) && (!-l $file)) { # don't recurse down symbolic link
74 # get the contents of this directory
75 if (!opendir (INDIR, $file)) {
76 print STDERR "util::filtered_rm_r could not open directory $file\n";
77 } else {
78 my @filedir = grep (!/^\.\.?$/, readdir (INDIR));
79 closedir (INDIR);
80
81 # remove all the files in this directory
82 map {$_="$file/$_";} @filedir;
83 &filtered_rm_r (\@filedir,$file_accept_re,$file_reject_re);
84
85 if (!defined $file_accept_re && !defined $file_reject_re) {
86 # remove this directory
87 if (!rmdir $file) {
88 print STDERR "util::filtered_rm_r couldn't remove directory $file\n";
89 }
90 }
91 }
92 } else {
93 next if (defined $file_reject_re && ($file =~ m/$file_reject_re/));
94
95 if ((!defined $file_accept_re) || ($file =~ m/$file_accept_re/)) {
96 # remove this file
97 &rm ($file);
98 }
99 }
100 }
101}
102
103
104# recursive removal
105sub rm_r {
106 my (@files) = @_;
107
108 # use the more general (but reterospectively written function
109 # filtered_rm_r function()
110
111 filtered_rm_r(\@files,undef,undef); # no accept or reject expressions
112}
113
114
115
116
117# moves a file or a group of files
118sub mv {
119 my $dest = pop (@_);
120 my (@srcfiles) = @_;
121
122 # remove trailing slashes from source and destination files
123 $dest =~ s/[\\\/]+$//;
124 map {$_ =~ s/[\\\/]+$//;} @srcfiles;
125
126 # a few sanity checks
127 if (scalar (@srcfiles) == 0) {
128 print STDERR "util::mv no destination directory given\n";
129 return;
130 } elsif ((scalar (@srcfiles) > 1) && (!-d $dest)) {
131 print STDERR "util::mv if multiple source files are given the ".
132 "destination must be a directory\n";
133 return;
134 }
135
136 # move the files
137 foreach my $file (@srcfiles) {
138 my $tempdest = $dest;
139 if (-d $tempdest) {
140 my ($filename) = $file =~ /([^\\\/]+)$/;
141 $tempdest .= "/$filename";
142 }
143 if (!-e $file) {
144 print STDERR "util::mv $file does not exist\n";
145 } else {
146 rename ($file, $tempdest);
147 }
148 }
149}
150
151
152# copies a file or a group of files
153sub cp {
154 my $dest = pop (@_);
155 my (@srcfiles) = @_;
156
157 # remove trailing slashes from source and destination files
158 $dest =~ s/[\\\/]+$//;
159 map {$_ =~ s/[\\\/]+$//;} @srcfiles;
160
161 # a few sanity checks
162 if (scalar (@srcfiles) == 0) {
163 print STDERR "util::cp no destination directory given\n";
164 return;
165 } elsif ((scalar (@srcfiles) > 1) && (!-d $dest)) {
166 print STDERR "util::cp if multiple source files are given the ".
167 "destination must be a directory\n";
168 return;
169 }
170
171 # copy the files
172 foreach my $file (@srcfiles) {
173 my $tempdest = $dest;
174 if (-d $tempdest) {
175 my ($filename) = $file =~ /([^\\\/]+)$/;
176 $tempdest .= "/$filename";
177 }
178 if (!-e $file) {
179 print STDERR "util::cp $file does not exist\n";
180 } elsif (!-f $file) {
181 print STDERR "util::cp $file is not a plain file\n";
182 } else {
183 &File::Copy::copy ($file, $tempdest);
184 }
185 }
186}
187
188
189
190# recursively copies a file or group of files
191# syntax: cp_r (sourcefiles, destination directory)
192# destination must be a directory - to copy one file to
193# another use cp instead
194sub cp_r {
195 my $dest = pop (@_);
196 my (@srcfiles) = @_;
197
198 # a few sanity checks
199 if (scalar (@srcfiles) == 0) {
200 print STDERR "util::cp_r no destination directory given\n";
201 return;
202 } elsif (-f $dest) {
203 print STDERR "util::cp_r destination must be a directory\n";
204 return;
205 }
206
207 # create destination directory if it doesn't exist already
208 if (! -d $dest) {
209 my $store_umask = umask(0002);
210 mkdir ($dest, 0777);
211 umask($store_umask);
212 }
213
214 # copy the files
215 foreach my $file (@srcfiles) {
216
217 if (!-e $file) {
218 print STDERR "util::cp_r $file does not exist\n";
219
220 } elsif (-d $file) {
221 # make the new directory
222 my ($filename) = $file =~ /([^\\\/]*)$/;
223 $dest = &util::filename_cat ($dest, $filename);
224 my $store_umask = umask(0002);
225 mkdir ($dest, 0777);
226 umask($store_umask);
227
228 # get the contents of this directory
229 if (!opendir (INDIR, $file)) {
230 print STDERR "util::cp_r could not open directory $file\n";
231 } else {
232 my @filedir = readdir (INDIR);
233 closedir (INDIR);
234 foreach my $f (@filedir) {
235 next if $f =~ /^\.\.?$/;
236 # copy all the files in this directory
237 my $ff = &util::filename_cat ($file, $f);
238 &cp_r ($ff, $dest);
239 }
240 }
241
242 } else {
243 &cp($file, $dest);
244 }
245 }
246}
247
248# copies a directory and its contents, excluding subdirectories, into a new directory
249sub cp_r_toplevel {
250 my $dest = pop (@_);
251 my (@srcfiles) = @_;
252
253 # a few sanity checks
254 if (scalar (@srcfiles) == 0) {
255 print STDERR "util::cp_r no destination directory given\n";
256 return;
257 } elsif (-f $dest) {
258 print STDERR "util::cp_r destination must be a directory\n";
259 return;
260 }
261
262 # create destination directory if it doesn't exist already
263 if (! -d $dest) {
264 my $store_umask = umask(0002);
265 mkdir ($dest, 0777);
266 umask($store_umask);
267 }
268
269 # copy the files
270 foreach my $file (@srcfiles) {
271
272 if (!-e $file) {
273 print STDERR "util::cp_r $file does not exist\n";
274
275 } elsif (-d $file) {
276 # make the new directory
277 my ($filename) = $file =~ /([^\\\/]*)$/;
278 $dest = &util::filename_cat ($dest, $filename);
279 my $store_umask = umask(0002);
280 mkdir ($dest, 0777);
281 umask($store_umask);
282
283 # get the contents of this directory
284 if (!opendir (INDIR, $file)) {
285 print STDERR "util::cp_r could not open directory $file\n";
286 } else {
287 my @filedir = readdir (INDIR);
288 closedir (INDIR);
289 foreach my $f (@filedir) {
290 next if $f =~ /^\.\.?$/;
291
292 # copy all the files in this directory, but not directories
293 my $ff = &util::filename_cat ($file, $f);
294 if (-f $ff) {
295 &cp($ff, $dest);
296 #&cp_r ($ff, $dest);
297 }
298 }
299 }
300
301 } else {
302 &cp($file, $dest);
303 }
304 }
305}
306
307sub mk_dir {
308 my ($dir) = @_;
309
310 my $store_umask = umask(0002);
311 my $mkdir_ok = mkdir ($dir, 0777);
312 umask($store_umask);
313
314 if (!$mkdir_ok)
315 {
316 print STDERR "util::mk_dir could not create directory $dir\n";
317 return;
318 }
319}
320
321# in case anyone cares - I did some testing (using perls Benchmark module)
322# on this subroutine against File::Path::mkpath (). mk_all_dir() is apparently
323# slightly faster (surprisingly) - Stefan.
324sub mk_all_dir {
325 my ($dir) = @_;
326
327 # use / for the directory separator, remove duplicate and
328 # trailing slashes
329 $dir=~s/[\\\/]+/\//g;
330 $dir=~s/[\\\/]+$//;
331
332 # make sure the cache directory exists
333 my $dirsofar = "";
334 my $first = 1;
335 foreach my $dirname (split ("/", $dir)) {
336 $dirsofar .= "/" unless $first;
337 $first = 0;
338
339 $dirsofar .= $dirname;
340
341 next if $dirname =~ /^(|[a-z]:)$/i;
342 if (!-e $dirsofar)
343 {
344 my $store_umask = umask(0002);
345 my $mkdir_ok = mkdir ($dirsofar, 0777);
346 umask($store_umask);
347 if (!$mkdir_ok)
348 {
349 print STDERR "util::mk_all_dir could not create directory $dirsofar\n";
350 return;
351 }
352 }
353 }
354}
355
356# make hard link to file if supported by OS, otherwise copy the file
357sub hard_link {
358 my ($src, $dest) = @_;
359
360 # remove trailing slashes from source and destination files
361 $src =~ s/[\\\/]+$//;
362 $dest =~ s/[\\\/]+$//;
363
364 # a few sanity checks
365 if (-e $dest) {
366 # destination file already exists
367 return;
368 }
369 elsif (!-e $src) {
370 print STDERR "util::hard_link source file $src does not exist\n";
371 return 1;
372 }
373 elsif (-d $src) {
374 print STDERR "util::hard_link source $src is a directory\n";
375 return 1;
376 }
377
378 my $dest_dir = &File::Basename::dirname($dest);
379 mk_all_dir($dest_dir) if (!-e $dest_dir);
380
381 # link not supported on windows 9x
382 if (($ENV{'GSDLOS'} =~ /^windows$/i) && (Win32::FsType() !~ /^ntfs$/i)) {
383 &File::Copy::copy ($src, $dest);
384
385 } elsif (!link($src, $dest)) {
386 print STDERR "util::hard_link: unable to create hard link. ";
387 print STDERR " Attempting to copy file: $src -> $dest\n";
388 &File::Copy::copy ($src, $dest);
389 }
390 return 0;
391}
392
393# make soft link to file if supported by OS, otherwise copy file
394sub soft_link {
395 my ($src, $dest) = @_;
396
397 # remove trailing slashes from source and destination files
398 $src =~ s/[\\\/]+$//;
399 $dest =~ s/[\\\/]+$//;
400
401 # a few sanity checks
402 if (!-e $src) {
403 print STDERR "util::soft_link source file $src does not exist\n";
404 return 0;
405 }
406
407 my $dest_dir = &File::Basename::dirname($dest);
408 mk_all_dir($dest_dir) if (!-e $dest_dir);
409
410 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
411 # symlink not supported on windows
412 &File::Copy::copy ($src, $dest);
413
414 } elsif (!eval {symlink($src, $dest)}) {
415 print STDERR "util::soft_link: unable to create soft link.\n";
416 return 0;
417 }
418
419 return 1;
420}
421
422
423
424
425# updates a copy of a directory in some other part of the filesystem
426# verbosity settings are: 0=low, 1=normal, 2=high
427# both $fromdir and $todir should be absolute paths
428sub cachedir {
429 my ($fromdir, $todir, $verbosity) = @_;
430 $verbosity = 1 unless defined $verbosity;
431
432 # use / for the directory separator, remove duplicate and
433 # trailing slashes
434 $fromdir=~s/[\\\/]+/\//g;
435 $fromdir=~s/[\\\/]+$//;
436 $todir=~s/[\\\/]+/\//g;
437 $todir=~s/[\\\/]+$//;
438
439 &mk_all_dir ($todir);
440
441 # get the directories in ascending order
442 if (!opendir (FROMDIR, $fromdir)) {
443 print STDERR "util::cachedir could not read directory $fromdir\n";
444 return;
445 }
446 my @fromdir = grep (!/^\.\.?$/, sort(readdir (FROMDIR)));
447 closedir (FROMDIR);
448
449 if (!opendir (TODIR, $todir)) {
450 print STDERR "util::cacedir could not read directory $todir\n";
451 return;
452 }
453 my @todir = grep (!/^\.\.?$/, sort(readdir (TODIR)));
454 closedir (TODIR);
455
456 my $fromi = 0;
457 my $toi = 0;
458
459 while ($fromi < scalar(@fromdir) || $toi < scalar(@todir)) {
460# print "fromi: $fromi toi: $toi\n";
461
462 # see if we should delete a file/directory
463 # this should happen if the file/directory
464 # is not in the from list or if its a different
465 # size, or has an older timestamp
466 if ($toi < scalar(@todir)) {
467 if (($fromi >= scalar(@fromdir)) ||
468 ($todir[$toi] lt $fromdir[$fromi] ||
469 ($todir[$toi] eq $fromdir[$fromi] &&
470 &differentfiles("$fromdir/$fromdir[$fromi]","$todir/$todir[$toi]",
471 $verbosity)))) {
472
473 # the files are different
474 &rm_r("$todir/$todir[$toi]");
475 splice(@todir, $toi, 1); # $toi stays the same
476
477 } elsif ($todir[$toi] eq $fromdir[$fromi]) {
478 # the files are the same
479 # if it is a directory, check its contents
480 if (-d "$todir/$todir[$toi]") {
481 &cachedir ("$fromdir/$fromdir[$fromi]",
482 "$todir/$todir[$toi]", $verbosity);
483 }
484
485 $toi++;
486 $fromi++;
487 next;
488 }
489 }
490
491 # see if we should insert a file/directory
492 # we should insert a file/directory if there
493 # is no tofiles left or if the tofile does not exist
494 if ($fromi < scalar(@fromdir) && ($toi >= scalar(@todir) ||
495 $todir[$toi] gt $fromdir[$fromi])) {
496 &cp_r ("$fromdir/$fromdir[$fromi]", "$todir/$fromdir[$fromi]");
497 splice (@todir, $toi, 0, $fromdir[$fromi]);
498
499 $toi++;
500 $fromi++;
501 }
502 }
503}
504
505# this function returns -1 if either file is not found
506# assumes that $file1 and $file2 are absolute file names or
507# in the current directory
508# $file2 is allowed to be newer than $file1
509sub differentfiles {
510 my ($file1, $file2, $verbosity) = @_;
511 $verbosity = 1 unless defined $verbosity;
512
513 $file1 =~ s/\/+$//;
514 $file2 =~ s/\/+$//;
515
516 my ($file1name) = $file1 =~ /\/([^\/]*)$/;
517 my ($file2name) = $file2 =~ /\/([^\/]*)$/;
518
519 return -1 unless (-e $file1 && -e $file2);
520 if ($file1name ne $file2name) {
521 print STDERR "filenames are not the same\n" if ($verbosity >= 2);
522 return 1;
523 }
524
525 my @file1stat = stat ($file1);
526 my @file2stat = stat ($file2);
527
528 if (-d $file1) {
529 if (! -d $file2) {
530 print STDERR "one file is a directory\n" if ($verbosity >= 2);
531 return 1;
532 }
533 return 0;
534 }
535
536 # both must be regular files
537 unless (-f $file1 && -f $file2) {
538 print STDERR "one file is not a regular file\n" if ($verbosity >= 2);
539 return 1;
540 }
541
542 # the size of the files must be the same
543 if ($file1stat[7] != $file2stat[7]) {
544 print STDERR "different sized files\n" if ($verbosity >= 2);
545 return 1;
546 }
547
548 # the second file cannot be older than the first
549 if ($file1stat[9] > $file2stat[9]) {
550 print STDERR "file is older\n" if ($verbosity >= 2);
551 return 1;
552 }
553
554 return 0;
555}
556
557
558sub get_tmp_filename {
559 my $tmpdir = filename_cat($ENV{'GSDLHOME'}, "tmp");
560 &mk_all_dir ($tmpdir) unless -e $tmpdir;
561
562 my $count = 1000;
563 my $rand = int(rand $count);
564 while (-e &filename_cat($tmpdir, "F$rand")) {
565 $rand = int(rand $count);
566 $count++;
567 }
568
569 return filename_cat($tmpdir, "F$rand");
570}
571
572
573sub filename_cat {
574 my $first_file = shift(@_);
575 my (@filenames) = @_;
576
577 # Check for empty first filename
578 if ($first_file =~ /\S/) {
579 unshift(@filenames, $first_file);
580 }
581
582 my $filename = join("/", @filenames);
583
584 # remove duplicate slashes and remove the last slash
585 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
586 $filename =~ s/[\\\/]+/\\/g;
587 } else {
588 $filename =~ s/[\/]+/\//g;
589 # DB: want a filename abc\de.html to remain like this
590 }
591 $filename =~ s/[\\\/]$//;
592
593 return $filename;
594}
595
596
597sub envvar_prepend {
598 my ($var,$val) = @_;
599
600 my $current_val = $ENV{$var};
601
602 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
603 $ENV{$var} .= "$val;$current_val";
604 }
605 else {
606 $ENV{$var} .= "$val:$current_val";
607 }
608}
609
610sub envvar_append {
611 my ($var,$val) = @_;
612
613 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
614 $ENV{$var} .= ";$val";
615 }
616 else {
617 $ENV{$var} .= ":$val";
618 }
619}
620
621
622# returns the path of a file without the filename -- ie. the directory the file is in
623sub filename_head {
624 my $filename = shift(@_);
625
626 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
627 $filename =~ s/[^\\\\]*$//;
628 }
629 else {
630 $filename =~ s/[^\\\/]*$//;
631 }
632
633 return $filename;
634}
635
636
637# returns 1 if filename1 and filename2 point to the same
638# file or directory
639sub filenames_equal {
640 my ($filename1, $filename2) = @_;
641
642 # use filename_cat to clean up trailing slashes and
643 # multiple slashes
644 $filename1 = filename_cat ($filename1);
645 $filename2 = filename_cat ($filename2);
646
647 # filenames not case sensitive on windows
648 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
649 $filename1 =~ tr/[A-Z]/[a-z]/;
650 $filename2 =~ tr/[A-Z]/[a-z]/;
651 }
652 return 1 if $filename1 eq $filename2;
653 return 0;
654}
655
656sub filename_within_collection
657{
658 my ($filename) = @_;
659
660 my $collect_dir = $ENV{'GSDLCOLLECTDIR'};
661
662 if (defined $collect_dir) {
663 my $dirsep = &util::get_dirsep();
664 if ($collect_dir !~ m/$dirsep$/) {
665 $collect_dir .= $dirsep;
666 }
667
668 $collect_dir =~ s/\\/\\\\/g; # escape DOS style file separator
669
670 if ($filename =~ /^$collect_dir(.*)$/) {
671 $filename = $1;
672 }
673 }
674
675 return $filename;
676}
677
678
679sub get_dirsep {
680
681 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
682 return "\\";
683 } else {
684 return "\/";
685 }
686}
687
688sub get_os_dirsep {
689
690 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
691 return "\\\\";
692 } else {
693 return "\\\/";
694 }
695}
696
697sub get_re_dirsep {
698
699 return "\\\\|\\\/";
700}
701
702
703# if this is running on windows we want binaries to end in
704# .exe, otherwise they don't have to end in any extension
705sub get_os_exe {
706 return ".exe" if $ENV{'GSDLOS'} =~ /^windows$/i;
707 return "";
708}
709
710
711# test to see whether this is a big or little endian machine
712sub is_little_endian {
713 # To determine the name of the operating system, the variable $^O is a cheap alternative to pulling it out of the Config module;
714 # What we do here is, if it is a Macintosh machine (i.e. the Darwin operating system), regardless it is running on the IBM power-pc cpu or it is the x86 Intel-based chip with a power-pc emulator running on top of it, it requires the big-endian data format in the gdbm database file, we make the file extension .bdb; otherwise it's .ldb extension.
715
716 #return 0 if $^O =~ /^darwin$/i;
717 return 0 if $ENV{'GSDLOS'} =~ /^darwin$/i;
718 return (ord(substr(pack("s",1), 0, 1)) == 1);
719}
720
721
722# will return the collection name if successful, "" otherwise
723sub use_collection {
724 my ($collection, $collectdir) = @_;
725
726 if (!defined $collectdir || $collectdir eq "") {
727 $collectdir = &filename_cat ($ENV{'GSDLHOME'}, "collect");
728 }
729
730 # get and check the collection
731 if (!defined($collection) || $collection eq "") {
732 if (defined $ENV{'GSDLCOLLECTION'}) {
733 $collection = $ENV{'GSDLCOLLECTION'};
734 } else {
735 print STDOUT "No collection specified\n";
736 return "";
737 }
738 }
739
740 if ($collection eq "modelcol") {
741 print STDOUT "You can't use modelcol.\n";
742 return "";
743 }
744
745 # make sure the environment variables GSDLCOLLECTION and GSDLCOLLECTDIR
746 # are defined
747 $ENV{'GSDLCOLLECTION'} = $collection unless defined $ENV{'GSDLCOLLECTION'};
748 $ENV{'GSDLCOLLECTDIR'} = &filename_cat ($collectdir, $collection);
749
750 # make sure this collection exists
751 if (!-e $ENV{'GSDLCOLLECTDIR'}) {
752 print STDOUT "Invalid collection ($collection).\n";
753 return "";
754 }
755
756 # everything is ready to go
757 return $collection;
758}
759
760sub hyperlink_text
761{
762 my ($text) = @_;
763
764 $text =~ s/(http:\/\/[^\s]+)/<a href=\"$1\">$1<\/a>/mg;
765 $text =~ s/(^|\s+)(www\.(\w|\.)+)/<a href=\"http:\/\/$2\">$2<\/a>/mg;
766
767 return $text;
768}
769
770
7711;
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