source: gsdl/trunk/perllib/util.pm@ 14926

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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
31use strict;
32
33
34# removes files (but not directories)
35sub rm {
36 my (@files) = @_;
37 my @filefiles = ();
38
39 # make sure the files we want to delete exist
40 # and are regular files
41 foreach my $file (@files) {
42 if (!-e $file) {
43 print STDERR "util::rm $file does not exist\n";
44 } elsif ((!-f $file) && (!-l $file)) {
45 print STDERR "util::rm $file is not a regular (or symbolic) file\n";
46 } else {
47 push (@filefiles, $file);
48 }
49 }
50
51 # remove the files
52 my $numremoved = unlink @filefiles;
53
54 # check to make sure all of them were removed
55 if ($numremoved != scalar(@filefiles)) {
56 print STDERR "util::rm Not all files were removed\n";
57 }
58}
59
60
61
62# recursive removal
63sub filtered_rm_r {
64 my ($files,$file_accept_re,$file_reject_re) = @_;
65
66 my @files_array = (ref $files eq "ARRAY") ? @$files : ($files);
67
68 # recursively remove the files
69 foreach my $file (@files_array) {
70 $file =~ s/[\/\\]+$//; # remove trailing slashes
71
72 if (!-e $file) {
73 print STDERR "util::filtered_rm_r $file does not exist\n";
74
75 } elsif ((-d $file) && (!-l $file)) { # don't recurse down symbolic link
76 # get the contents of this directory
77 if (!opendir (INDIR, $file)) {
78 print STDERR "util::filtered_rm_r could not open directory $file\n";
79 } else {
80 my @filedir = grep (!/^\.\.?$/, readdir (INDIR));
81 closedir (INDIR);
82
83 # remove all the files in this directory
84 map {$_="$file/$_";} @filedir;
85 &filtered_rm_r (\@filedir,$file_accept_re,$file_reject_re);
86
87 if (!defined $file_accept_re && !defined $file_reject_re) {
88 # remove this directory
89 if (!rmdir $file) {
90 print STDERR "util::filtered_rm_r couldn't remove directory $file\n";
91 }
92 }
93 }
94 } else {
95 next if (defined $file_reject_re && ($file =~ m/$file_reject_re/));
96
97 if ((!defined $file_accept_re) || ($file =~ m/$file_accept_re/)) {
98 # remove this file
99 &rm ($file);
100 }
101 }
102 }
103}
104
105
106# recursive removal
107sub rm_r {
108 my (@files) = @_;
109
110 # use the more general (but reterospectively written function
111 # filtered_rm_r function()
112
113 filtered_rm_r(\@files,undef,undef); # no accept or reject expressions
114}
115
116
117
118
119# moves a file or a group of files
120sub mv {
121 my $dest = pop (@_);
122 my (@srcfiles) = @_;
123
124 # remove trailing slashes from source and destination files
125 $dest =~ s/[\\\/]+$//;
126 map {$_ =~ s/[\\\/]+$//;} @srcfiles;
127
128 # a few sanity checks
129 if (scalar (@srcfiles) == 0) {
130 print STDERR "util::mv no destination directory given\n";
131 return;
132 } elsif ((scalar (@srcfiles) > 1) && (!-d $dest)) {
133 print STDERR "util::mv if multiple source files are given the ".
134 "destination must be a directory\n";
135 return;
136 }
137
138 # move the files
139 foreach my $file (@srcfiles) {
140 my $tempdest = $dest;
141 if (-d $tempdest) {
142 my ($filename) = $file =~ /([^\\\/]+)$/;
143 $tempdest .= "/$filename";
144 }
145 if (!-e $file) {
146 print STDERR "util::mv $file does not exist\n";
147 } else {
148 rename ($file, $tempdest);
149 }
150 }
151}
152
153
154# copies a file or a group of files
155sub cp {
156 my $dest = pop (@_);
157 my (@srcfiles) = @_;
158
159 # remove trailing slashes from source and destination files
160 $dest =~ s/[\\\/]+$//;
161 map {$_ =~ s/[\\\/]+$//;} @srcfiles;
162
163 # a few sanity checks
164 if (scalar (@srcfiles) == 0) {
165 print STDERR "util::cp no destination directory given\n";
166 return;
167 } elsif ((scalar (@srcfiles) > 1) && (!-d $dest)) {
168 print STDERR "util::cp if multiple source files are given the ".
169 "destination must be a directory\n";
170 return;
171 }
172
173 # copy the files
174 foreach my $file (@srcfiles) {
175 my $tempdest = $dest;
176 if (-d $tempdest) {
177 my ($filename) = $file =~ /([^\\\/]+)$/;
178 $tempdest .= "/$filename";
179 }
180 if (!-e $file) {
181 print STDERR "util::cp $file does not exist\n";
182 } elsif (!-f $file) {
183 print STDERR "util::cp $file is not a plain file\n";
184 } else {
185 &File::Copy::copy ($file, $tempdest);
186 }
187 }
188}
189
190
191
192# recursively copies a file or group of files
193# syntax: cp_r (sourcefiles, destination directory)
194# destination must be a directory - to copy one file to
195# another use cp instead
196sub cp_r {
197 my $dest = pop (@_);
198 my (@srcfiles) = @_;
199
200 # a few sanity checks
201 if (scalar (@srcfiles) == 0) {
202 print STDERR "util::cp_r no destination directory given\n";
203 return;
204 } elsif (-f $dest) {
205 print STDERR "util::cp_r destination must be a directory\n";
206 return;
207 }
208
209 # create destination directory if it doesn't exist already
210 if (! -d $dest) {
211 my $store_umask = umask(0002);
212 mkdir ($dest, 0777);
213 umask($store_umask);
214 }
215
216 # copy the files
217 foreach my $file (@srcfiles) {
218
219 if (!-e $file) {
220 print STDERR "util::cp_r $file does not exist\n";
221
222 } elsif (-d $file) {
223 # make the new directory
224 my ($filename) = $file =~ /([^\\\/]*)$/;
225 $dest = &util::filename_cat ($dest, $filename);
226 my $store_umask = umask(0002);
227 mkdir ($dest, 0777);
228 umask($store_umask);
229
230 # get the contents of this directory
231 if (!opendir (INDIR, $file)) {
232 print STDERR "util::cp_r could not open directory $file\n";
233 } else {
234 my @filedir = readdir (INDIR);
235 closedir (INDIR);
236 foreach my $f (@filedir) {
237 next if $f =~ /^\.\.?$/;
238 # copy all the files in this directory
239 my $ff = &util::filename_cat ($file, $f);
240 &cp_r ($ff, $dest);
241 }
242 }
243
244 } else {
245 &cp($file, $dest);
246 }
247 }
248}
249
250# copies a directory and its contents, excluding subdirectories, into a new directory
251sub cp_r_toplevel {
252 my $dest = pop (@_);
253 my (@srcfiles) = @_;
254
255 # a few sanity checks
256 if (scalar (@srcfiles) == 0) {
257 print STDERR "util::cp_r no destination directory given\n";
258 return;
259 } elsif (-f $dest) {
260 print STDERR "util::cp_r destination must be a directory\n";
261 return;
262 }
263
264 # create destination directory if it doesn't exist already
265 if (! -d $dest) {
266 my $store_umask = umask(0002);
267 mkdir ($dest, 0777);
268 umask($store_umask);
269 }
270
271 # copy the files
272 foreach my $file (@srcfiles) {
273
274 if (!-e $file) {
275 print STDERR "util::cp_r $file does not exist\n";
276
277 } elsif (-d $file) {
278 # make the new directory
279 my ($filename) = $file =~ /([^\\\/]*)$/;
280 $dest = &util::filename_cat ($dest, $filename);
281 my $store_umask = umask(0002);
282 mkdir ($dest, 0777);
283 umask($store_umask);
284
285 # get the contents of this directory
286 if (!opendir (INDIR, $file)) {
287 print STDERR "util::cp_r could not open directory $file\n";
288 } else {
289 my @filedir = readdir (INDIR);
290 closedir (INDIR);
291 foreach my $f (@filedir) {
292 next if $f =~ /^\.\.?$/;
293
294 # copy all the files in this directory, but not directories
295 my $ff = &util::filename_cat ($file, $f);
296 if (-f $ff) {
297 &cp($ff, $dest);
298 #&cp_r ($ff, $dest);
299 }
300 }
301 }
302
303 } else {
304 &cp($file, $dest);
305 }
306 }
307}
308
309sub mk_dir {
310 my ($dir) = @_;
311
312 my $store_umask = umask(0002);
313 my $mkdir_ok = mkdir ($dir, 0777);
314 umask($store_umask);
315
316 if (!$mkdir_ok)
317 {
318 print STDERR "util::mk_dir could not create directory $dir\n";
319 return;
320 }
321}
322
323# in case anyone cares - I did some testing (using perls Benchmark module)
324# on this subroutine against File::Path::mkpath (). mk_all_dir() is apparently
325# slightly faster (surprisingly) - Stefan.
326sub mk_all_dir {
327 my ($dir) = @_;
328
329 # use / for the directory separator, remove duplicate and
330 # trailing slashes
331 $dir=~s/[\\\/]+/\//g;
332 $dir=~s/[\\\/]+$//;
333
334 # make sure the cache directory exists
335 my $dirsofar = "";
336 my $first = 1;
337 foreach my $dirname (split ("/", $dir)) {
338 $dirsofar .= "/" unless $first;
339 $first = 0;
340
341 $dirsofar .= $dirname;
342
343 next if $dirname =~ /^(|[a-z]:)$/i;
344 if (!-e $dirsofar)
345 {
346 my $store_umask = umask(0002);
347 my $mkdir_ok = mkdir ($dirsofar, 0777);
348 umask($store_umask);
349 if (!$mkdir_ok)
350 {
351 print STDERR "util::mk_all_dir could not create directory $dirsofar\n";
352 return;
353 }
354 }
355 }
356}
357
358# make hard link to file if supported by OS, otherwise copy the file
359sub hard_link {
360 my ($src, $dest) = @_;
361
362 # remove trailing slashes from source and destination files
363 $src =~ s/[\\\/]+$//;
364 $dest =~ s/[\\\/]+$//;
365
366 # a few sanity checks
367 if (-e $dest) {
368 # destination file already exists
369 return;
370 }
371 elsif (!-e $src) {
372 print STDERR "util::hard_link source file $src does not exist\n";
373 return 1;
374 }
375 elsif (-d $src) {
376 print STDERR "util::hard_link source $src is a directory\n";
377 return 1;
378 }
379
380 my $dest_dir = &File::Basename::dirname($dest);
381 mk_all_dir($dest_dir) if (!-e $dest_dir);
382
383 # link not supported on windows 9x
384 if (($ENV{'GSDLOS'} =~ /^windows$/i) && (Win32::FsType() !~ /^ntfs$/i)) {
385 &File::Copy::copy ($src, $dest);
386
387 } elsif (!link($src, $dest)) {
388 print STDERR "util::hard_link: unable to create hard link. ";
389 print STDERR " Attempting to copy file: $src -> $dest\n";
390 &File::Copy::copy ($src, $dest);
391 }
392 return 0;
393}
394
395# make soft link to file if supported by OS, otherwise copy file
396sub soft_link {
397 my ($src, $dest) = @_;
398
399 # remove trailing slashes from source and destination files
400 $src =~ s/[\\\/]+$//;
401 $dest =~ s/[\\\/]+$//;
402
403 # a few sanity checks
404 if (!-e $src) {
405 print STDERR "util::soft_link source file $src does not exist\n";
406 return 0;
407 }
408
409 my $dest_dir = &File::Basename::dirname($dest);
410 mk_all_dir($dest_dir) if (!-e $dest_dir);
411
412 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
413 # symlink not supported on windows
414 &File::Copy::copy ($src, $dest);
415
416 } elsif (!eval {symlink($src, $dest)}) {
417 print STDERR "util::soft_link: unable to create soft link.\n";
418 return 0;
419 }
420
421 return 1;
422}
423
424
425
426
427# updates a copy of a directory in some other part of the filesystem
428# verbosity settings are: 0=low, 1=normal, 2=high
429# both $fromdir and $todir should be absolute paths
430sub cachedir {
431 my ($fromdir, $todir, $verbosity) = @_;
432 $verbosity = 1 unless defined $verbosity;
433
434 # use / for the directory separator, remove duplicate and
435 # trailing slashes
436 $fromdir=~s/[\\\/]+/\//g;
437 $fromdir=~s/[\\\/]+$//;
438 $todir=~s/[\\\/]+/\//g;
439 $todir=~s/[\\\/]+$//;
440
441 &mk_all_dir ($todir);
442
443 # get the directories in ascending order
444 if (!opendir (FROMDIR, $fromdir)) {
445 print STDERR "util::cachedir could not read directory $fromdir\n";
446 return;
447 }
448 my @fromdir = grep (!/^\.\.?$/, sort(readdir (FROMDIR)));
449 closedir (FROMDIR);
450
451 if (!opendir (TODIR, $todir)) {
452 print STDERR "util::cacedir could not read directory $todir\n";
453 return;
454 }
455 my @todir = grep (!/^\.\.?$/, sort(readdir (TODIR)));
456 closedir (TODIR);
457
458 my $fromi = 0;
459 my $toi = 0;
460
461 while ($fromi < scalar(@fromdir) || $toi < scalar(@todir)) {
462# print "fromi: $fromi toi: $toi\n";
463
464 # see if we should delete a file/directory
465 # this should happen if the file/directory
466 # is not in the from list or if its a different
467 # size, or has an older timestamp
468 if ($toi < scalar(@todir)) {
469 if (($fromi >= scalar(@fromdir)) ||
470 ($todir[$toi] lt $fromdir[$fromi] ||
471 ($todir[$toi] eq $fromdir[$fromi] &&
472 &differentfiles("$fromdir/$fromdir[$fromi]","$todir/$todir[$toi]",
473 $verbosity)))) {
474
475 # the files are different
476 &rm_r("$todir/$todir[$toi]");
477 splice(@todir, $toi, 1); # $toi stays the same
478
479 } elsif ($todir[$toi] eq $fromdir[$fromi]) {
480 # the files are the same
481 # if it is a directory, check its contents
482 if (-d "$todir/$todir[$toi]") {
483 &cachedir ("$fromdir/$fromdir[$fromi]",
484 "$todir/$todir[$toi]", $verbosity);
485 }
486
487 $toi++;
488 $fromi++;
489 next;
490 }
491 }
492
493 # see if we should insert a file/directory
494 # we should insert a file/directory if there
495 # is no tofiles left or if the tofile does not exist
496 if ($fromi < scalar(@fromdir) && ($toi >= scalar(@todir) ||
497 $todir[$toi] gt $fromdir[$fromi])) {
498 &cp_r ("$fromdir/$fromdir[$fromi]", "$todir/$fromdir[$fromi]");
499 splice (@todir, $toi, 0, $fromdir[$fromi]);
500
501 $toi++;
502 $fromi++;
503 }
504 }
505}
506
507# this function returns -1 if either file is not found
508# assumes that $file1 and $file2 are absolute file names or
509# in the current directory
510# $file2 is allowed to be newer than $file1
511sub differentfiles {
512 my ($file1, $file2, $verbosity) = @_;
513 $verbosity = 1 unless defined $verbosity;
514
515 $file1 =~ s/\/+$//;
516 $file2 =~ s/\/+$//;
517
518 my ($file1name) = $file1 =~ /\/([^\/]*)$/;
519 my ($file2name) = $file2 =~ /\/([^\/]*)$/;
520
521 return -1 unless (-e $file1 && -e $file2);
522 if ($file1name ne $file2name) {
523 print STDERR "filenames are not the same\n" if ($verbosity >= 2);
524 return 1;
525 }
526
527 my @file1stat = stat ($file1);
528 my @file2stat = stat ($file2);
529
530 if (-d $file1) {
531 if (! -d $file2) {
532 print STDERR "one file is a directory\n" if ($verbosity >= 2);
533 return 1;
534 }
535 return 0;
536 }
537
538 # both must be regular files
539 unless (-f $file1 && -f $file2) {
540 print STDERR "one file is not a regular file\n" if ($verbosity >= 2);
541 return 1;
542 }
543
544 # the size of the files must be the same
545 if ($file1stat[7] != $file2stat[7]) {
546 print STDERR "different sized files\n" if ($verbosity >= 2);
547 return 1;
548 }
549
550 # the second file cannot be older than the first
551 if ($file1stat[9] > $file2stat[9]) {
552 print STDERR "file is older\n" if ($verbosity >= 2);
553 return 1;
554 }
555
556 return 0;
557}
558
559
560sub get_tmp_filename {
561 my $tmpdir = filename_cat($ENV{'GSDLHOME'}, "tmp");
562 &mk_all_dir ($tmpdir) unless -e $tmpdir;
563
564 my $count = 1000;
565 my $rand = int(rand $count);
566 while (-e &filename_cat($tmpdir, "F$rand")) {
567 $rand = int(rand $count);
568 $count++;
569 }
570
571 return filename_cat($tmpdir, "F$rand");
572}
573
574
575sub filename_cat {
576 my $first_file = shift(@_);
577 my (@filenames) = @_;
578
579 # Check for empty first filename
580 if ($first_file =~ /\S/) {
581 unshift(@filenames, $first_file);
582 }
583
584 my $filename = join("/", @filenames);
585
586 # remove duplicate slashes and remove the last slash
587 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
588 $filename =~ s/[\\\/]+/\\/g;
589 } else {
590 $filename =~ s/[\/]+/\//g;
591 # DB: want a filename abc\de.html to remain like this
592 }
593 $filename =~ s/[\\\/]$//;
594
595 return $filename;
596}
597
598
599sub envvar_prepend {
600 my ($var,$val) = @_;
601
602 my $current_val = $ENV{$var};
603
604 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
605 $ENV{$var} .= "$val;$current_val";
606 }
607 else {
608 $ENV{$var} .= "$val:$current_val";
609 }
610}
611
612sub envvar_append {
613 my ($var,$val) = @_;
614
615 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
616 $ENV{$var} .= ";$val";
617 }
618 else {
619 $ENV{$var} .= ":$val";
620 }
621}
622
623
624# returns the path of a file without the filename -- ie. the directory the file is in
625sub filename_head {
626 my $filename = shift(@_);
627
628 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
629 $filename =~ s/[^\\\\]*$//;
630 }
631 else {
632 $filename =~ s/[^\\\/]*$//;
633 }
634
635 return $filename;
636}
637
638
639# returns 1 if filename1 and filename2 point to the same
640# file or directory
641sub filenames_equal {
642 my ($filename1, $filename2) = @_;
643
644 # use filename_cat to clean up trailing slashes and
645 # multiple slashes
646 $filename1 = filename_cat ($filename1);
647 $filename2 = filename_cat ($filename2);
648
649 # filenames not case sensitive on windows
650 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
651 $filename1 =~ tr/[A-Z]/[a-z]/;
652 $filename2 =~ tr/[A-Z]/[a-z]/;
653 }
654 return 1 if $filename1 eq $filename2;
655 return 0;
656}
657
658sub filename_within_collection
659{
660 my ($filename) = @_;
661
662 my $collect_dir = $ENV{'GSDLCOLLECTDIR'};
663
664 if (defined $collect_dir) {
665 my $dirsep = &util::get_dirsep();
666 if ($collect_dir !~ m/$dirsep$/) {
667 $collect_dir .= $dirsep;
668 }
669
670 $collect_dir =~ s/\\/\\\\/g; # escape DOS style file separator
671
672 if ($filename =~ /^$collect_dir(.*)$/) {
673 $filename = $1;
674 }
675 }
676
677 return $filename;
678}
679
680
681sub get_dirsep {
682
683 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
684 return "\\";
685 } else {
686 return "\/";
687 }
688}
689
690sub get_os_dirsep {
691
692 if ($ENV{'GSDLOS'} =~ /^windows$/i) {
693 return "\\\\";
694 } else {
695 return "\\\/";
696 }
697}
698
699sub get_re_dirsep {
700
701 return "\\\\|\\\/";
702}
703
704
705# if this is running on windows we want binaries to end in
706# .exe, otherwise they don't have to end in any extension
707sub get_os_exe {
708 return ".exe" if $ENV{'GSDLOS'} =~ /^windows$/i;
709 return "";
710}
711
712
713# test to see whether this is a big or little endian machine
714sub is_little_endian {
715 # To determine the name of the operating system, the variable $^O is a cheap alternative to pulling it out of the Config module;
716 # 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.
717
718 #return 0 if $^O =~ /^darwin$/i;
719 return 0 if $ENV{'GSDLOS'} =~ /^darwin$/i;
720 return (ord(substr(pack("s",1), 0, 1)) == 1);
721}
722
723
724# will return the collection name if successful, "" otherwise
725sub use_collection {
726 my ($collection, $collectdir) = @_;
727
728 if (!defined $collectdir || $collectdir eq "") {
729 $collectdir = &filename_cat ($ENV{'GSDLHOME'}, "collect");
730 }
731
732 # get and check the collection
733 if (!defined($collection) || $collection eq "") {
734 if (defined $ENV{'GSDLCOLLECTION'}) {
735 $collection = $ENV{'GSDLCOLLECTION'};
736 } else {
737 print STDOUT "No collection specified\n";
738 return "";
739 }
740 }
741
742 if ($collection eq "modelcol") {
743 print STDOUT "You can't use modelcol.\n";
744 return "";
745 }
746
747 # make sure the environment variables GSDLCOLLECTION and GSDLCOLLECTDIR
748 # are defined
749 $ENV{'GSDLCOLLECTION'} = $collection unless defined $ENV{'GSDLCOLLECTION'};
750 $ENV{'GSDLCOLLECTDIR'} = &filename_cat ($collectdir, $collection);
751
752 # make sure this collection exists
753 if (!-e $ENV{'GSDLCOLLECTDIR'}) {
754 print STDOUT "Invalid collection ($collection).\n";
755 return "";
756 }
757
758 # everything is ready to go
759 return $collection;
760}
761
762
763
764
765# will return the collection name if successful, "" otherwise.
766# Like use_collection (above) but for greenstone 3 (taking account of site level)
767
768sub use_site_collection {
769 my ($site, $collection, $collectdir) = @_;
770
771 if (!defined $collectdir || $collectdir eq "") {
772 die "GSDL3HOME not set.\n" unless defined $ENV{'GSDL3HOME'};
773 $collectdir = &filename_cat ($ENV{'GSDL3HOME'}, "sites", $site, "collect");
774 }
775
776 # collectdir explicitly set by this point (using $site variable if required).
777 # Can call "old" gsdl2 use_collection now.
778
779 return use_collection($collection,$collectdir);
780}
781
782
783
784sub hyperlink_text
785{
786 my ($text) = @_;
787
788 $text =~ s/(http:\/\/[^\s]+)/<a href=\"$1\">$1<\/a>/mg;
789 $text =~ s/(^|\s+)(www\.(\w|\.)+)/<a href=\"http:\/\/$2\">$2<\/a>/mg;
790
791 return $text;
792}
793
794
7951;
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