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1 | ### the gnu tar specification: |
2 | ### http://www.gnu.org/software/tar/manual/html_mono/tar.html |
3 | ### |
4 | ### and the pax format spec, which tar derives from: |
5 | ### http://www.opengroup.org/onlinepubs/007904975/utilities/pax.html |
6 | |
7 | package Archive::Tar; |
8 | require 5.005_03; |
9 | |
10 | use strict; |
11 | use vars qw[$DEBUG $error $VERSION $WARN $FOLLOW_SYMLINK $CHOWN $CHMOD |
12 | $DO_NOT_USE_PREFIX $HAS_PERLIO $HAS_IO_STRING]; |
13 | |
14 | $DEBUG = 0; |
15 | $WARN = 1; |
16 | $FOLLOW_SYMLINK = 0; |
17 | $VERSION = "1.24"; |
18 | $CHOWN = 1; |
19 | $CHMOD = 1; |
20 | $DO_NOT_USE_PREFIX = 0; |
21 | |
22 | BEGIN { |
23 | use Config; |
24 | $HAS_PERLIO = $Config::Config{useperlio}; |
25 | |
26 | ### try and load IO::String anyway, so you can dynamically |
27 | ### switch between perlio and IO::String |
28 | eval { |
29 | require IO::String; |
30 | import IO::String; |
31 | }; |
32 | $HAS_IO_STRING = $@ ? 0 : 1; |
33 | |
34 | } |
35 | |
36 | use Cwd; |
37 | use IO::File; |
38 | use Carp qw(carp croak); |
39 | use File::Spec (); |
40 | use File::Spec::Unix (); |
41 | use File::Path (); |
42 | |
43 | use Archive::Tar::File; |
44 | use Archive::Tar::Constant; |
45 | |
46 | =head1 NAME |
47 | |
48 | Archive::Tar - module for manipulations of tar archives |
49 | |
50 | =head1 SYNOPSIS |
51 | |
52 | use Archive::Tar; |
53 | my $tar = Archive::Tar->new; |
54 | |
55 | $tar->read('origin.tgz',1); |
56 | $tar->extract(); |
57 | |
58 | $tar->add_files('file/foo.pl', 'docs/README'); |
59 | $tar->add_data('file/baz.txt', 'This is the contents now'); |
60 | |
61 | $tar->rename('oldname', 'new/file/name'); |
62 | |
63 | $tar->write('files.tar'); |
64 | |
65 | =head1 DESCRIPTION |
66 | |
67 | Archive::Tar provides an object oriented mechanism for handling tar |
68 | files. It provides class methods for quick and easy files handling |
69 | while also allowing for the creation of tar file objects for custom |
70 | manipulation. If you have the IO::Zlib module installed, |
71 | Archive::Tar will also support compressed or gzipped tar files. |
72 | |
73 | An object of class Archive::Tar represents a .tar(.gz) archive full |
74 | of files and things. |
75 | |
76 | =head1 Object Methods |
77 | |
78 | =head2 Archive::Tar->new( [$file, $compressed] ) |
79 | |
80 | Returns a new Tar object. If given any arguments, C<new()> calls the |
81 | C<read()> method automatically, passing on the arguments provided to |
82 | the C<read()> method. |
83 | |
84 | If C<new()> is invoked with arguments and the C<read()> method fails |
85 | for any reason, C<new()> returns undef. |
86 | |
87 | =cut |
88 | |
89 | my $tmpl = { |
90 | _data => [ ], |
91 | _file => 'Unknown', |
92 | }; |
93 | |
94 | ### install get/set accessors for this object. |
95 | for my $key ( keys %$tmpl ) { |
96 | no strict 'refs'; |
97 | *{__PACKAGE__."::$key"} = sub { |
98 | my $self = shift; |
99 | $self->{$key} = $_[0] if @_; |
100 | return $self->{$key}; |
101 | } |
102 | } |
103 | |
104 | sub new { |
105 | my $class = shift; |
106 | $class = ref $class if ref $class; |
107 | |
108 | ### copying $tmpl here since a shallow copy makes it use the |
109 | ### same aref, causing for files to remain in memory always. |
110 | my $obj = bless { _data => [ ], _file => 'Unknown' }, $class; |
111 | |
112 | if (@_) { |
113 | return unless $obj->read( @_ ); |
114 | } |
115 | |
116 | return $obj; |
117 | } |
118 | |
119 | =head2 $tar->read ( $filename|$handle, $compressed, {opt => 'val'} ) |
120 | |
121 | Read the given tar file into memory. |
122 | The first argument can either be the name of a file or a reference to |
123 | an already open filehandle (or an IO::Zlib object if it's compressed) |
124 | The second argument indicates whether the file referenced by the first |
125 | argument is compressed. |
126 | |
127 | The C<read> will I<replace> any previous content in C<$tar>! |
128 | |
129 | The second argument may be considered optional if IO::Zlib is |
130 | installed, since it will transparently Do The Right Thing. |
131 | Archive::Tar will warn if you try to pass a compressed file if |
132 | IO::Zlib is not available and simply return. |
133 | |
134 | The third argument can be a hash reference with options. Note that |
135 | all options are case-sensitive. |
136 | |
137 | =over 4 |
138 | |
139 | =item limit |
140 | |
141 | Do not read more than C<limit> files. This is useful if you have |
142 | very big archives, and are only interested in the first few files. |
143 | |
144 | =item extract |
145 | |
146 | If set to true, immediately extract entries when reading them. This |
147 | gives you the same memory break as the C<extract_archive> function. |
148 | Note however that entries will not be read into memory, but written |
149 | straight to disk. |
150 | |
151 | =back |
152 | |
153 | All files are stored internally as C<Archive::Tar::File> objects. |
154 | Please consult the L<Archive::Tar::File> documentation for details. |
155 | |
156 | Returns the number of files read in scalar context, and a list of |
157 | C<Archive::Tar::File> objects in list context. |
158 | |
159 | =cut |
160 | |
161 | sub read { |
162 | my $self = shift; |
163 | my $file = shift; |
164 | my $gzip = shift || 0; |
165 | my $opts = shift || {}; |
166 | |
167 | unless( defined $file ) { |
168 | $self->_error( qq[No file to read from!] ); |
169 | return; |
170 | } else { |
171 | $self->_file( $file ); |
172 | } |
173 | |
174 | my $handle = $self->_get_handle($file, $gzip, READ_ONLY->( ZLIB ) ) |
175 | or return; |
176 | |
177 | my $data = $self->_read_tar( $handle, $opts ) or return; |
178 | |
179 | $self->_data( $data ); |
180 | |
181 | return wantarray ? @$data : scalar @$data; |
182 | } |
183 | |
184 | sub _get_handle { |
185 | my $self = shift; |
186 | my $file = shift; return unless defined $file; |
187 | return $file if ref $file; |
188 | |
189 | my $gzip = shift || 0; |
190 | my $mode = shift || READ_ONLY->( ZLIB ); # default to read only |
191 | |
192 | my $fh; my $bin; |
193 | |
194 | ### only default to ZLIB if we're not trying to /write/ to a handle ### |
195 | if( ZLIB and $gzip || MODE_READ->( $mode ) ) { |
196 | |
197 | ### IO::Zlib will Do The Right Thing, even when passed |
198 | ### a plain file ### |
199 | $fh = new IO::Zlib; |
200 | |
201 | } else { |
202 | if( $gzip ) { |
203 | $self->_error(qq[Compression not available - Install IO::Zlib!]); |
204 | return; |
205 | |
206 | } else { |
207 | $fh = new IO::File; |
208 | $bin++; |
209 | } |
210 | } |
211 | |
212 | unless( $fh->open( $file, $mode ) ) { |
213 | $self->_error( qq[Could not create filehandle for '$file': $!!] ); |
214 | return; |
215 | } |
216 | |
217 | binmode $fh if $bin; |
218 | |
219 | return $fh; |
220 | } |
221 | |
222 | sub _read_tar { |
223 | my $self = shift; |
224 | my $handle = shift or return; |
225 | my $opts = shift || {}; |
226 | |
227 | my $count = $opts->{limit} || 0; |
228 | my $extract = $opts->{extract} || 0; |
229 | |
230 | ### set a cap on the amount of files to extract ### |
231 | my $limit = 0; |
232 | $limit = 1 if $count > 0; |
233 | |
234 | my $tarfile = [ ]; |
235 | my $chunk; |
236 | my $read = 0; |
237 | my $real_name; # to set the name of a file when |
238 | # we're encountering @longlink |
239 | my $data; |
240 | |
241 | LOOP: |
242 | while( $handle->read( $chunk, HEAD ) ) { |
243 | ### IO::Zlib doesn't support this yet |
244 | my $offset = eval { tell $handle } || 'unknown'; |
245 | |
246 | unless( $read++ ) { |
247 | my $gzip = GZIP_MAGIC_NUM; |
248 | if( $chunk =~ /$gzip/ ) { |
249 | $self->_error( qq[Cannot read compressed format in tar-mode] ); |
250 | return; |
251 | } |
252 | } |
253 | |
254 | ### if we can't read in all bytes... ### |
255 | last if length $chunk != HEAD; |
256 | |
257 | ### Apparently this should really be two blocks of 512 zeroes, |
258 | ### but GNU tar sometimes gets it wrong. See comment in the |
259 | ### source code (tar.c) to GNU cpio. |
260 | next if $chunk eq TAR_END; |
261 | |
262 | my $entry; |
263 | unless( $entry = Archive::Tar::File->new( chunk => $chunk ) ) { |
264 | $self->_error( qq[Couldn't read chunk at offset $offset] ); |
265 | next; |
266 | } |
267 | |
268 | ### ignore labels: |
269 | ### http://www.gnu.org/manual/tar/html_node/tar_139.html |
270 | next if $entry->is_label; |
271 | |
272 | if( length $entry->type and ($entry->is_file || $entry->is_longlink) ) { |
273 | |
274 | if ( $entry->is_file && !$entry->validate ) { |
275 | ### sometimes the chunk is rather fux0r3d and a whole 512 |
276 | ### bytes ends p in the ->name area. |
277 | ### clean it up, if need be |
278 | my $name = $entry->name; |
279 | $name = substr($name, 0, 100) if length $name > 100; |
280 | $name =~ s/\n/ /g; |
281 | |
282 | $self->_error( $name . qq[: checksum error] ); |
283 | next LOOP; |
284 | } |
285 | |
286 | my $block = BLOCK_SIZE->( $entry->size ); |
287 | |
288 | $data = $entry->get_content_by_ref; |
289 | |
290 | ### just read everything into memory |
291 | ### can't do lazy loading since IO::Zlib doesn't support 'seek' |
292 | ### this is because Compress::Zlib doesn't support it =/ |
293 | ### this reads in the whole data in one read() call. |
294 | if( $handle->read( $$data, $block ) < $block ) { |
295 | $self->_error( qq[Read error on tarfile (missing data) ']. |
296 | $entry->full_path ."' at offset $offset" ); |
297 | next; |
298 | } |
299 | |
300 | ### throw away trailing garbage ### |
301 | substr ($$data, $entry->size) = ""; |
302 | |
303 | ### part II of the @LongLink munging -- need to do /after/ |
304 | ### the checksum check. |
305 | if( $entry->is_longlink ) { |
306 | ### weird thing in tarfiles -- if the file is actually a |
307 | ### @LongLink, the data part seems to have a trailing ^@ |
308 | ### (unprintable) char. to display, pipe output through less. |
309 | ### but that doesn't *always* happen.. so check if the last |
310 | ### character is a control character, and if so remove it |
311 | ### at any rate, we better remove that character here, or tests |
312 | ### like 'eq' and hashlook ups based on names will SO not work |
313 | ### remove it by calculating the proper size, and then |
314 | ### tossing out everything that's longer than that size. |
315 | |
316 | ### count number of nulls |
317 | my $nulls = $$data =~ tr/\0/\0/; |
318 | |
319 | ### cut data + size by that many bytes |
320 | $entry->size( $entry->size - $nulls ); |
321 | substr ($$data, $entry->size) = ""; |
322 | } |
323 | } |
324 | |
325 | ### clean up of the entries.. posix tar /apparently/ has some |
326 | ### weird 'feature' that allows for filenames > 255 characters |
327 | ### they'll put a header in with as name '././@LongLink' and the |
328 | ### contents will be the name of the /next/ file in the archive |
329 | ### pretty crappy and kludgy if you ask me |
330 | |
331 | ### set the name for the next entry if this is a @LongLink; |
332 | ### this is one ugly hack =/ but needed for direct extraction |
333 | if( $entry->is_longlink ) { |
334 | $real_name = $data; |
335 | next; |
336 | } elsif ( defined $real_name ) { |
337 | $entry->name( $$real_name ); |
338 | $entry->prefix(''); |
339 | undef $real_name; |
340 | } |
341 | |
342 | $self->_extract_file( $entry ) if $extract |
343 | && !$entry->is_longlink |
344 | && !$entry->is_unknown |
345 | && !$entry->is_label; |
346 | |
347 | ### Guard against tarfiles with garbage at the end |
348 | last LOOP if $entry->name eq ''; |
349 | |
350 | ### push only the name on the rv if we're extracting |
351 | ### -- for extract_archive |
352 | push @$tarfile, ($extract ? $entry->name : $entry); |
353 | |
354 | if( $limit ) { |
355 | $count-- unless $entry->is_longlink || $entry->is_dir; |
356 | last LOOP unless $count; |
357 | } |
358 | } continue { |
359 | undef $data; |
360 | } |
361 | |
362 | return $tarfile; |
363 | } |
364 | |
365 | =head2 $tar->contains_file( $filename ) |
366 | |
367 | Check if the archive contains a certain file. |
368 | It will return true if the file is in the archive, false otherwise. |
369 | |
370 | Note however, that this function does an exact match using C<eq> |
371 | on the full path. So it cannot compensate for case-insensitive file- |
372 | systems or compare 2 paths to see if they would point to the same |
373 | underlying file. |
374 | |
375 | =cut |
376 | |
377 | sub contains_file { |
378 | my $self = shift; |
379 | my $full = shift or return; |
380 | |
381 | return 1 if $self->_find_entry($full); |
382 | return; |
383 | } |
384 | |
385 | =head2 $tar->extract( [@filenames] ) |
386 | |
387 | Write files whose names are equivalent to any of the names in |
388 | C<@filenames> to disk, creating subdirectories as necessary. This |
389 | might not work too well under VMS. |
390 | Under MacPerl, the file's modification time will be converted to the |
391 | MacOS zero of time, and appropriate conversions will be done to the |
392 | path. However, the length of each element of the path is not |
393 | inspected to see whether it's longer than MacOS currently allows (32 |
394 | characters). |
395 | |
396 | If C<extract> is called without a list of file names, the entire |
397 | contents of the archive are extracted. |
398 | |
399 | Returns a list of filenames extracted. |
400 | |
401 | =cut |
402 | |
403 | sub extract { |
404 | my $self = shift; |
405 | my @files; |
406 | |
407 | ### you requested the extraction of only certian files |
408 | if( @_ ) { |
409 | for my $file (@_) { |
410 | my $found; |
411 | for my $entry ( @{$self->_data} ) { |
412 | next unless $file eq $entry->full_path; |
413 | |
414 | ### we found the file you're looking for |
415 | push @files, $entry; |
416 | $found++; |
417 | } |
418 | |
419 | unless( $found ) { |
420 | return $self->_error( qq[Could not find '$file' in archive] ); |
421 | } |
422 | } |
423 | |
424 | ### just grab all the file items |
425 | } else { |
426 | @files = $self->get_files; |
427 | } |
428 | |
429 | ### nothing found? that's an error |
430 | unless( scalar @files ) { |
431 | $self->_error( qq[No files found for ] . $self->_file ); |
432 | return; |
433 | } |
434 | |
435 | ### now extract them |
436 | for my $entry ( @files ) { |
437 | unless( $self->_extract_file( $entry ) ) { |
438 | $self->_error(q[Could not extract ']. $entry->full_path .q['] ); |
439 | return; |
440 | } |
441 | } |
442 | |
443 | return @files; |
444 | } |
445 | |
446 | =head2 $tar->extract_file( $file, [$extract_path] ) |
447 | |
448 | Write an entry, whose name is equivalent to the file name provided to |
449 | disk. Optionally takes a second parameter, which is the full (unix) |
450 | path (including filename) the entry will be written to. |
451 | |
452 | For example: |
453 | |
454 | $tar->extract_file( 'name/in/archive', 'name/i/want/to/give/it' ); |
455 | |
456 | Returns true on success, false on failure. |
457 | |
458 | =cut |
459 | |
460 | sub extract_file { |
461 | my $self = shift; |
462 | my $file = shift or return; |
463 | my $alt = shift; |
464 | |
465 | my $entry = $self->_find_entry( $file ) |
466 | or $self->_error( qq[Could not find an entry for '$file'] ), return; |
467 | |
468 | return $self->_extract_file( $entry, $alt ); |
469 | } |
470 | |
471 | sub _extract_file { |
472 | my $self = shift; |
473 | my $entry = shift or return; |
474 | my $alt = shift; |
475 | my $cwd = cwd(); |
476 | |
477 | ### you wanted an alternate extraction location ### |
478 | my $name = defined $alt ? $alt : $entry->full_path; |
479 | |
480 | ### splitpath takes a bool at the end to indicate |
481 | ### that it's splitting a dir |
482 | my ($vol,$dirs,$file) = File::Spec::Unix->splitpath( $name, |
483 | $entry->is_dir ); |
484 | my $dir; |
485 | ### is $name an absolute path? ### |
486 | if( File::Spec->file_name_is_absolute( $dirs ) ) { |
487 | $dir = $dirs; |
488 | |
489 | ### it's a relative path ### |
490 | } else { |
491 | my @dirs = File::Spec::Unix->splitdir( $dirs ); |
492 | my @cwd = File::Spec->splitdir( $cwd ); |
493 | $dir = File::Spec->catdir(@cwd, @dirs); |
494 | } |
495 | |
496 | if( -e $dir && !-d _ ) { |
497 | $^W && $self->_error( qq['$dir' exists, but it's not a directory!\n] ); |
498 | return; |
499 | } |
500 | |
501 | unless ( -d _ ) { |
502 | eval { File::Path::mkpath( $dir, 0, 0777 ) }; |
503 | if( $@ ) { |
504 | $self->_error( qq[Could not create directory '$dir': $@] ); |
505 | return; |
506 | } |
507 | } |
508 | |
509 | ### we're done if we just needed to create a dir ### |
510 | return 1 if $entry->is_dir; |
511 | |
512 | my $full = File::Spec->catfile( $dir, $file ); |
513 | |
514 | if( $entry->is_unknown ) { |
515 | $self->_error( qq[Unknown file type for file '$full'] ); |
516 | return; |
517 | } |
518 | |
519 | if( length $entry->type && $entry->is_file ) { |
520 | my $fh = IO::File->new; |
521 | $fh->open( '>' . $full ) or ( |
522 | $self->_error( qq[Could not open file '$full': $!] ), |
523 | return |
524 | ); |
525 | |
526 | if( $entry->size ) { |
527 | binmode $fh; |
528 | syswrite $fh, $entry->data or ( |
529 | $self->_error( qq[Could not write data to '$full'] ), |
530 | return |
531 | ); |
532 | } |
533 | |
534 | close $fh or ( |
535 | $self->_error( qq[Could not close file '$full'] ), |
536 | return |
537 | ); |
538 | |
539 | } else { |
540 | $self->_make_special_file( $entry, $full ) or return; |
541 | } |
542 | |
543 | utime time, $entry->mtime - TIME_OFFSET, $full or |
544 | $self->_error( qq[Could not update timestamp] ); |
545 | |
546 | if( $CHOWN && CAN_CHOWN ) { |
547 | chown $entry->uid, $entry->gid, $full or |
548 | $self->_error( qq[Could not set uid/gid on '$full'] ); |
549 | } |
550 | |
551 | ### only chmod if we're allowed to, but never chmod symlinks, since they'll |
552 | ### change the perms on the file they're linking too... |
553 | if( $CHMOD and not -l $full ) { |
554 | chmod $entry->mode, $full or |
555 | $self->_error( qq[Could not chown '$full' to ] . $entry->mode ); |
556 | } |
557 | |
558 | return 1; |
559 | } |
560 | |
561 | sub _make_special_file { |
562 | my $self = shift; |
563 | my $entry = shift or return; |
564 | my $file = shift; return unless defined $file; |
565 | |
566 | my $err; |
567 | |
568 | if( $entry->is_symlink ) { |
569 | my $fail; |
570 | if( ON_UNIX ) { |
571 | symlink( $entry->linkname, $file ) or $fail++; |
572 | |
573 | } else { |
574 | $self->_extract_special_file_as_plain_file( $entry, $file ) |
575 | or $fail++; |
576 | } |
577 | |
578 | $err = qq[Making symbolink link from '] . $entry->linkname . |
579 | qq[' to '$file' failed] if $fail; |
580 | |
581 | } elsif ( $entry->is_hardlink ) { |
582 | my $fail; |
583 | if( ON_UNIX ) { |
584 | link( $entry->linkname, $file ) or $fail++; |
585 | |
586 | } else { |
587 | $self->_extract_special_file_as_plain_file( $entry, $file ) |
588 | or $fail++; |
589 | } |
590 | |
591 | $err = qq[Making hard link from '] . $entry->linkname . |
592 | qq[' to '$file' failed] if $fail; |
593 | |
594 | } elsif ( $entry->is_fifo ) { |
595 | ON_UNIX && !system('mknod', $file, 'p') or |
596 | $err = qq[Making fifo ']. $entry->name .qq[' failed]; |
597 | |
598 | } elsif ( $entry->is_blockdev or $entry->is_chardev ) { |
599 | my $mode = $entry->is_blockdev ? 'b' : 'c'; |
600 | |
601 | ON_UNIX && !system('mknod', $file, $mode, |
602 | $entry->devmajor, $entry->devminor) or |
603 | $err = qq[Making block device ']. $entry->name .qq[' (maj=] . |
604 | $entry->devmajor . qq[ min=] . $entry->devminor . |
605 | qq[) failed.]; |
606 | |
607 | } elsif ( $entry->is_socket ) { |
608 | ### the original doesn't do anything special for sockets.... ### |
609 | 1; |
610 | } |
611 | |
612 | return $err ? $self->_error( $err ) : 1; |
613 | } |
614 | |
615 | ### don't know how to make symlinks, let's just extract the file as |
616 | ### a plain file |
617 | sub _extract_special_file_as_plain_file { |
618 | my $self = shift; |
619 | my $entry = shift or return; |
620 | my $file = shift; return unless defined $file; |
621 | |
622 | my $err; |
623 | TRY: { |
624 | my $orig = $self->_find_entry( $entry->linkname ); |
625 | |
626 | unless( $orig ) { |
627 | $err = qq[Could not find file '] . $entry->linkname . |
628 | qq[' in memory.]; |
629 | last TRY; |
630 | } |
631 | |
632 | ### clone the entry, make it appear as a normal file ### |
633 | my $clone = $entry->clone; |
634 | $clone->_downgrade_to_plainfile; |
635 | $self->_extract_file( $clone, $file ) or last TRY; |
636 | |
637 | return 1; |
638 | } |
639 | |
640 | return $self->_error($err); |
641 | } |
642 | |
643 | =head2 $tar->list_files( [\@properties] ) |
644 | |
645 | Returns a list of the names of all the files in the archive. |
646 | |
647 | If C<list_files()> is passed an array reference as its first argument |
648 | it returns a list of hash references containing the requested |
649 | properties of each file. The following list of properties is |
650 | supported: name, size, mtime (last modified date), mode, uid, gid, |
651 | linkname, uname, gname, devmajor, devminor, prefix. |
652 | |
653 | Passing an array reference containing only one element, 'name', is |
654 | special cased to return a list of names rather than a list of hash |
655 | references, making it equivalent to calling C<list_files> without |
656 | arguments. |
657 | |
658 | =cut |
659 | |
660 | sub list_files { |
661 | my $self = shift; |
662 | my $aref = shift || [ ]; |
663 | |
664 | unless( $self->_data ) { |
665 | $self->read() or return; |
666 | } |
667 | |
668 | if( @$aref == 0 or ( @$aref == 1 and $aref->[0] eq 'name' ) ) { |
669 | return map { $_->full_path } @{$self->_data}; |
670 | } else { |
671 | |
672 | #my @rv; |
673 | #for my $obj ( @{$self->_data} ) { |
674 | # push @rv, { map { $_ => $obj->$_() } @$aref }; |
675 | #} |
676 | #return @rv; |
677 | |
678 | ### this does the same as the above.. just needs a +{ } |
679 | ### to make sure perl doesn't confuse it for a block |
680 | return map { my $o=$_; |
681 | +{ map { $_ => $o->$_() } @$aref } |
682 | } @{$self->_data}; |
683 | } |
684 | } |
685 | |
686 | sub _find_entry { |
687 | my $self = shift; |
688 | my $file = shift; |
689 | |
690 | unless( defined $file ) { |
691 | $self->_error( qq[No file specified] ); |
692 | return; |
693 | } |
694 | |
695 | for my $entry ( @{$self->_data} ) { |
696 | my $path = $entry->full_path; |
697 | return $entry if $path eq $file; |
698 | } |
699 | |
700 | $self->_error( qq[No such file in archive: '$file'] ); |
701 | return; |
702 | } |
703 | |
704 | =head2 $tar->get_files( [@filenames] ) |
705 | |
706 | Returns the C<Archive::Tar::File> objects matching the filenames |
707 | provided. If no filename list was passed, all C<Archive::Tar::File> |
708 | objects in the current Tar object are returned. |
709 | |
710 | Please refer to the C<Archive::Tar::File> documentation on how to |
711 | handle these objects. |
712 | |
713 | =cut |
714 | |
715 | sub get_files { |
716 | my $self = shift; |
717 | |
718 | return @{ $self->_data } unless @_; |
719 | |
720 | my @list; |
721 | for my $file ( @_ ) { |
722 | push @list, grep { defined } $self->_find_entry( $file ); |
723 | } |
724 | |
725 | return @list; |
726 | } |
727 | |
728 | =head2 $tar->get_content( $file ) |
729 | |
730 | Return the content of the named file. |
731 | |
732 | =cut |
733 | |
734 | sub get_content { |
735 | my $self = shift; |
736 | my $entry = $self->_find_entry( shift ) or return; |
737 | |
738 | return $entry->data; |
739 | } |
740 | |
741 | =head2 $tar->replace_content( $file, $content ) |
742 | |
743 | Make the string $content be the content for the file named $file. |
744 | |
745 | =cut |
746 | |
747 | sub replace_content { |
748 | my $self = shift; |
749 | my $entry = $self->_find_entry( shift ) or return; |
750 | |
751 | return $entry->replace_content( shift ); |
752 | } |
753 | |
754 | =head2 $tar->rename( $file, $new_name ) |
755 | |
756 | Rename the file of the in-memory archive to $new_name. |
757 | |
758 | Note that you must specify a Unix path for $new_name, since per tar |
759 | standard, all files in the archive must be Unix paths. |
760 | |
761 | Returns true on success and false on failure. |
762 | |
763 | =cut |
764 | |
765 | sub rename { |
766 | my $self = shift; |
767 | my $file = shift; return unless defined $file; |
768 | my $new = shift; return unless defined $new; |
769 | |
770 | my $entry = $self->_find_entry( $file ) or return; |
771 | |
772 | return $entry->rename( $new ); |
773 | } |
774 | |
775 | =head2 $tar->remove (@filenamelist) |
776 | |
777 | Removes any entries with names matching any of the given filenames |
778 | from the in-memory archive. Returns a list of C<Archive::Tar::File> |
779 | objects that remain. |
780 | |
781 | =cut |
782 | |
783 | sub remove { |
784 | my $self = shift; |
785 | my @list = @_; |
786 | |
787 | my %seen = map { $_->full_path => $_ } @{$self->_data}; |
788 | delete $seen{ $_ } for @list; |
789 | |
790 | $self->_data( [values %seen] ); |
791 | |
792 | return values %seen; |
793 | } |
794 | |
795 | =head2 $tar->clear |
796 | |
797 | C<clear> clears the current in-memory archive. This effectively gives |
798 | you a 'blank' object, ready to be filled again. Note that C<clear> |
799 | only has effect on the object, not the underlying tarfile. |
800 | |
801 | =cut |
802 | |
803 | sub clear { |
804 | my $self = shift or return; |
805 | |
806 | $self->_data( [] ); |
807 | $self->_file( '' ); |
808 | |
809 | return 1; |
810 | } |
811 | |
812 | |
813 | =head2 $tar->write ( [$file, $compressed, $prefix] ) |
814 | |
815 | Write the in-memory archive to disk. The first argument can either |
816 | be the name of a file or a reference to an already open filehandle (a |
817 | GLOB reference). If the second argument is true, the module will use |
818 | IO::Zlib to write the file in a compressed format. If IO::Zlib is |
819 | not available, the C<write> method will fail and return. |
820 | |
821 | Note that when you pass in a filehandle, the compression argument |
822 | is ignored, as all files are printed verbatim to your filehandle. |
823 | If you wish to enable compression with filehandles, use an |
824 | C<IO::Zlib> filehandle instead. |
825 | |
826 | Specific levels of compression can be chosen by passing the values 2 |
827 | through 9 as the second parameter. |
828 | |
829 | The third argument is an optional prefix. All files will be tucked |
830 | away in the directory you specify as prefix. So if you have files |
831 | 'a' and 'b' in your archive, and you specify 'foo' as prefix, they |
832 | will be written to the archive as 'foo/a' and 'foo/b'. |
833 | |
834 | If no arguments are given, C<write> returns the entire formatted |
835 | archive as a string, which could be useful if you'd like to stuff the |
836 | archive into a socket or a pipe to gzip or something. |
837 | |
838 | =cut |
839 | |
840 | sub write { |
841 | my $self = shift; |
842 | my $file = shift; $file = '' unless defined $file; |
843 | my $gzip = shift || 0; |
844 | my $ext_prefix = shift; $ext_prefix = '' unless defined $ext_prefix; |
845 | my $dummy = ''; |
846 | |
847 | ### only need a handle if we have a file to print to ### |
848 | my $handle = length($file) |
849 | ? ( $self->_get_handle($file, $gzip, WRITE_ONLY->($gzip) ) |
850 | or return ) |
851 | : $HAS_PERLIO ? do { open my $h, '>', \$dummy; $h } |
852 | : $HAS_IO_STRING ? IO::String->new |
853 | : __PACKAGE__->no_string_support(); |
854 | |
855 | |
856 | |
857 | for my $entry ( @{$self->_data} ) { |
858 | ### entries to be written to the tarfile ### |
859 | my @write_me; |
860 | |
861 | ### only now will we change the object to reflect the current state |
862 | ### of the name and prefix fields -- this needs to be limited to |
863 | ### write() only! |
864 | my $clone = $entry->clone; |
865 | |
866 | |
867 | ### so, if you don't want use to use the prefix, we'll stuff |
868 | ### everything in the name field instead |
869 | if( $DO_NOT_USE_PREFIX ) { |
870 | |
871 | ### you might have an extended prefix, if so, set it in the clone |
872 | ### XXX is ::Unix right? |
873 | $clone->name( length $ext_prefix |
874 | ? File::Spec::Unix->catdir( $ext_prefix, |
875 | $clone->full_path) |
876 | : $clone->full_path ); |
877 | $clone->prefix( '' ); |
878 | |
879 | ### otherwise, we'll have to set it properly -- prefix part in the |
880 | ### prefix and name part in the name field. |
881 | } else { |
882 | |
883 | ### split them here, not before! |
884 | my ($prefix,$name) = $clone->_prefix_and_file( $clone->full_path ); |
885 | |
886 | ### you might have an extended prefix, if so, set it in the clone |
887 | ### XXX is ::Unix right? |
888 | $prefix = File::Spec::Unix->catdir( $ext_prefix, $prefix ) |
889 | if length $ext_prefix; |
890 | |
891 | $clone->prefix( $prefix ); |
892 | $clone->name( $name ); |
893 | } |
894 | |
895 | ### names are too long, and will get truncated if we don't add a |
896 | ### '@LongLink' file... |
897 | my $make_longlink = ( length($clone->name) > NAME_LENGTH or |
898 | length($clone->prefix) > PREFIX_LENGTH |
899 | ) || 0; |
900 | |
901 | ### perhaps we need to make a longlink file? |
902 | if( $make_longlink ) { |
903 | my $longlink = Archive::Tar::File->new( |
904 | data => LONGLINK_NAME, |
905 | $clone->full_path, |
906 | { type => LONGLINK } |
907 | ); |
908 | |
909 | unless( $longlink ) { |
910 | $self->_error( qq[Could not create 'LongLink' entry for ] . |
911 | qq[oversize file '] . $clone->full_path ."'" ); |
912 | return; |
913 | }; |
914 | |
915 | push @write_me, $longlink; |
916 | } |
917 | |
918 | push @write_me, $clone; |
919 | |
920 | ### write the one, optionally 2 a::t::file objects to the handle |
921 | for my $clone (@write_me) { |
922 | |
923 | ### if the file is a symlink, there are 2 options: |
924 | ### either we leave the symlink intact, but then we don't write any |
925 | ### data OR we follow the symlink, which means we actually make a |
926 | ### copy. if we do the latter, we have to change the TYPE of the |
927 | ### clone to 'FILE' |
928 | my $link_ok = $clone->is_symlink && $Archive::Tar::FOLLOW_SYMLINK; |
929 | my $data_ok = !$clone->is_symlink && $clone->has_content; |
930 | |
931 | ### downgrade to a 'normal' file if it's a symlink we're going to |
932 | ### treat as a regular file |
933 | $clone->_downgrade_to_plainfile if $link_ok; |
934 | |
935 | ### get the header for this block |
936 | my $header = $self->_format_tar_entry( $clone ); |
937 | unless( $header ) { |
938 | $self->_error(q[Could not format header for: ] . |
939 | $clone->full_path ); |
940 | return; |
941 | } |
942 | |
943 | unless( print $handle $header ) { |
944 | $self->_error(q[Could not write header for: ] . |
945 | $clone->full_path); |
946 | return; |
947 | } |
948 | |
949 | if( $link_ok or $data_ok ) { |
950 | unless( print $handle $clone->data ) { |
951 | $self->_error(q[Could not write data for: ] . |
952 | $clone->full_path); |
953 | return; |
954 | } |
955 | |
956 | ### pad the end of the clone if required ### |
957 | print $handle TAR_PAD->( $clone->size ) if $clone->size % BLOCK |
958 | } |
959 | |
960 | } ### done writing these entries |
961 | } |
962 | |
963 | ### write the end markers ### |
964 | print $handle TAR_END x 2 or |
965 | return $self->_error( qq[Could not write tar end markers] ); |
966 | ### did you want it written to a file, or returned as a string? ### |
967 | return length($file) ? 1 |
968 | : $HAS_PERLIO ? $dummy |
969 | : do { seek $handle, 0, 0; local $/; <$handle> } |
970 | } |
971 | |
972 | sub _format_tar_entry { |
973 | my $self = shift; |
974 | my $entry = shift or return; |
975 | my $ext_prefix = shift; $ext_prefix = '' unless defined $ext_prefix; |
976 | my $no_prefix = shift || 0; |
977 | |
978 | my $file = $entry->name; |
979 | my $prefix = $entry->prefix; $prefix = '' unless defined $prefix; |
980 | |
981 | ### remove the prefix from the file name |
982 | ### not sure if this is still neeeded --kane |
983 | ### no it's not -- Archive::Tar::File->_new_from_file will take care of |
984 | ### this for us. Even worse, this would break if we tried to add a file |
985 | ### like x/x. |
986 | #if( length $prefix ) { |
987 | # $file =~ s/^$match//; |
988 | #} |
989 | |
990 | $prefix = File::Spec::Unix->catdir($ext_prefix, $prefix) |
991 | if length $ext_prefix; |
992 | |
993 | ### not sure why this is... ### |
994 | my $l = PREFIX_LENGTH; # is ambiguous otherwise... |
995 | substr ($prefix, 0, -$l) = "" if length $prefix >= PREFIX_LENGTH; |
996 | |
997 | my $f1 = "%06o"; my $f2 = "%11o"; |
998 | |
999 | ### this might be optimizable with a 'changed' flag in the file objects ### |
1000 | my $tar = pack ( |
1001 | PACK, |
1002 | $file, |
1003 | |
1004 | (map { sprintf( $f1, $entry->$_() ) } qw[mode uid gid]), |
1005 | (map { sprintf( $f2, $entry->$_() ) } qw[size mtime]), |
1006 | |
1007 | "", # checksum field - space padded a bit down |
1008 | |
1009 | (map { $entry->$_() } qw[type linkname magic]), |
1010 | |
1011 | $entry->version || TAR_VERSION, |
1012 | |
1013 | (map { $entry->$_() } qw[uname gname]), |
1014 | (map { sprintf( $f1, $entry->$_() ) } qw[devmajor devminor]), |
1015 | |
1016 | ($no_prefix ? '' : $prefix) |
1017 | ); |
1018 | |
1019 | ### add the checksum ### |
1020 | substr($tar,148,7) = sprintf("%6o\0", unpack("%16C*",$tar)); |
1021 | |
1022 | return $tar; |
1023 | } |
1024 | |
1025 | =head2 $tar->add_files( @filenamelist ) |
1026 | |
1027 | Takes a list of filenames and adds them to the in-memory archive. |
1028 | |
1029 | The path to the file is automatically converted to a Unix like |
1030 | equivalent for use in the archive, and, if on MacOS, the file's |
1031 | modification time is converted from the MacOS epoch to the Unix epoch. |
1032 | So tar archives created on MacOS with B<Archive::Tar> can be read |
1033 | both with I<tar> on Unix and applications like I<suntar> or |
1034 | I<Stuffit Expander> on MacOS. |
1035 | |
1036 | Be aware that the file's type/creator and resource fork will be lost, |
1037 | which is usually what you want in cross-platform archives. |
1038 | |
1039 | Returns a list of C<Archive::Tar::File> objects that were just added. |
1040 | |
1041 | =cut |
1042 | |
1043 | sub add_files { |
1044 | my $self = shift; |
1045 | my @files = @_ or return; |
1046 | |
1047 | my @rv; |
1048 | for my $file ( @files ) { |
1049 | unless( -e $file ) { |
1050 | $self->_error( qq[No such file: '$file'] ); |
1051 | next; |
1052 | } |
1053 | |
1054 | my $obj = Archive::Tar::File->new( file => $file ); |
1055 | unless( $obj ) { |
1056 | $self->_error( qq[Unable to add file: '$file'] ); |
1057 | next; |
1058 | } |
1059 | |
1060 | push @rv, $obj; |
1061 | } |
1062 | |
1063 | push @{$self->{_data}}, @rv; |
1064 | |
1065 | return @rv; |
1066 | } |
1067 | |
1068 | =head2 $tar->add_data ( $filename, $data, [$opthashref] ) |
1069 | |
1070 | Takes a filename, a scalar full of data and optionally a reference to |
1071 | a hash with specific options. |
1072 | |
1073 | Will add a file to the in-memory archive, with name C<$filename> and |
1074 | content C<$data>. Specific properties can be set using C<$opthashref>. |
1075 | The following list of properties is supported: name, size, mtime |
1076 | (last modified date), mode, uid, gid, linkname, uname, gname, |
1077 | devmajor, devminor, prefix. (On MacOS, the file's path and |
1078 | modification times are converted to Unix equivalents.) |
1079 | |
1080 | Returns the C<Archive::Tar::File> object that was just added, or |
1081 | C<undef> on failure. |
1082 | |
1083 | =cut |
1084 | |
1085 | sub add_data { |
1086 | my $self = shift; |
1087 | my ($file, $data, $opt) = @_; |
1088 | |
1089 | my $obj = Archive::Tar::File->new( data => $file, $data, $opt ); |
1090 | unless( $obj ) { |
1091 | $self->_error( qq[Unable to add file: '$file'] ); |
1092 | return; |
1093 | } |
1094 | |
1095 | push @{$self->{_data}}, $obj; |
1096 | |
1097 | return $obj; |
1098 | } |
1099 | |
1100 | =head2 $tar->error( [$BOOL] ) |
1101 | |
1102 | Returns the current errorstring (usually, the last error reported). |
1103 | If a true value was specified, it will give the C<Carp::longmess> |
1104 | equivalent of the error, in effect giving you a stacktrace. |
1105 | |
1106 | For backwards compatibility, this error is also available as |
1107 | C<$Archive::Tar::error> although it is much recommended you use the |
1108 | method call instead. |
1109 | |
1110 | =cut |
1111 | |
1112 | { |
1113 | $error = ''; |
1114 | my $longmess; |
1115 | |
1116 | sub _error { |
1117 | my $self = shift; |
1118 | my $msg = $error = shift; |
1119 | $longmess = Carp::longmess($error); |
1120 | |
1121 | ### set Archive::Tar::WARN to 0 to disable printing |
1122 | ### of errors |
1123 | if( $WARN ) { |
1124 | carp $DEBUG ? $longmess : $msg; |
1125 | } |
1126 | |
1127 | return; |
1128 | } |
1129 | |
1130 | sub error { |
1131 | my $self = shift; |
1132 | return shift() ? $longmess : $error; |
1133 | } |
1134 | } |
1135 | |
1136 | |
1137 | =head2 $bool = $tar->has_io_string |
1138 | |
1139 | Returns true if we currently have C<IO::String> support loaded. |
1140 | |
1141 | Either C<IO::String> or C<perlio> support is needed to support writing |
1142 | stringified archives. Currently, C<perlio> is the preffered method, if |
1143 | available. |
1144 | |
1145 | See the C<GLOBAL VARIABLES> section to see how to change this preference. |
1146 | |
1147 | =cut |
1148 | |
1149 | sub has_io_string { return $HAS_IO_STRING; } |
1150 | |
1151 | =head2 $bool = $tar->has_perlio |
1152 | |
1153 | Returns true if we currently have C<perlio> support loaded. |
1154 | |
1155 | This requires C<perl-5.8> or higher, compiled with C<perlio> |
1156 | |
1157 | Either C<IO::String> or C<perlio> support is needed to support writing |
1158 | stringified archives. Currently, C<perlio> is the preffered method, if |
1159 | available. |
1160 | |
1161 | See the C<GLOBAL VARIABLES> section to see how to change this preference. |
1162 | |
1163 | =cut |
1164 | |
1165 | sub has_perlio { return $HAS_PERLIO; } |
1166 | |
1167 | |
1168 | =head1 Class Methods |
1169 | |
1170 | =head2 Archive::Tar->create_archive($file, $compression, @filelist) |
1171 | |
1172 | Creates a tar file from the list of files provided. The first |
1173 | argument can either be the name of the tar file to create or a |
1174 | reference to an open file handle (e.g. a GLOB reference). |
1175 | |
1176 | The second argument specifies the level of compression to be used, if |
1177 | any. Compression of tar files requires the installation of the |
1178 | IO::Zlib module. Specific levels of compression may be |
1179 | requested by passing a value between 2 and 9 as the second argument. |
1180 | Any other value evaluating as true will result in the default |
1181 | compression level being used. |
1182 | |
1183 | Note that when you pass in a filehandle, the compression argument |
1184 | is ignored, as all files are printed verbatim to your filehandle. |
1185 | If you wish to enable compression with filehandles, use an |
1186 | C<IO::Zlib> filehandle instead. |
1187 | |
1188 | The remaining arguments list the files to be included in the tar file. |
1189 | These files must all exist. Any files which don't exist or can't be |
1190 | read are silently ignored. |
1191 | |
1192 | If the archive creation fails for any reason, C<create_archive> will |
1193 | return false. Please use the C<error> method to find the cause of the |
1194 | failure. |
1195 | |
1196 | Note that this method does not write C<on the fly> as it were; it |
1197 | still reads all the files into memory before writing out the archive. |
1198 | Consult the FAQ below if this is a problem. |
1199 | |
1200 | =cut |
1201 | |
1202 | sub create_archive { |
1203 | my $class = shift; |
1204 | |
1205 | my $file = shift; return unless defined $file; |
1206 | my $gzip = shift || 0; |
1207 | my @files = @_; |
1208 | |
1209 | unless( @files ) { |
1210 | return $class->_error( qq[Cowardly refusing to create empty archive!] ); |
1211 | } |
1212 | |
1213 | my $tar = $class->new; |
1214 | $tar->add_files( @files ); |
1215 | return $tar->write( $file, $gzip ); |
1216 | } |
1217 | |
1218 | =head2 Archive::Tar->list_archive ($file, $compressed, [\@properties]) |
1219 | |
1220 | Returns a list of the names of all the files in the archive. The |
1221 | first argument can either be the name of the tar file to list or a |
1222 | reference to an open file handle (e.g. a GLOB reference). |
1223 | |
1224 | If C<list_archive()> is passed an array reference as its third |
1225 | argument it returns a list of hash references containing the requested |
1226 | properties of each file. The following list of properties is |
1227 | supported: name, size, mtime (last modified date), mode, uid, gid, |
1228 | linkname, uname, gname, devmajor, devminor, prefix. |
1229 | |
1230 | Passing an array reference containing only one element, 'name', is |
1231 | special cased to return a list of names rather than a list of hash |
1232 | references. |
1233 | |
1234 | =cut |
1235 | |
1236 | sub list_archive { |
1237 | my $class = shift; |
1238 | my $file = shift; return unless defined $file; |
1239 | my $gzip = shift || 0; |
1240 | |
1241 | my $tar = $class->new($file, $gzip); |
1242 | return unless $tar; |
1243 | |
1244 | return $tar->list_files( @_ ); |
1245 | } |
1246 | |
1247 | =head2 Archive::Tar->extract_archive ($file, $gzip) |
1248 | |
1249 | Extracts the contents of the tar file. The first argument can either |
1250 | be the name of the tar file to create or a reference to an open file |
1251 | handle (e.g. a GLOB reference). All relative paths in the tar file will |
1252 | be created underneath the current working directory. |
1253 | |
1254 | C<extract_archive> will return a list of files it extracted. |
1255 | If the archive extraction fails for any reason, C<extract_archive> |
1256 | will return false. Please use the C<error> method to find the cause |
1257 | of the failure. |
1258 | |
1259 | =cut |
1260 | |
1261 | sub extract_archive { |
1262 | my $class = shift; |
1263 | my $file = shift; return unless defined $file; |
1264 | my $gzip = shift || 0; |
1265 | |
1266 | my $tar = $class->new( ) or return; |
1267 | |
1268 | return $tar->read( $file, $gzip, { extract => 1 } ); |
1269 | } |
1270 | |
1271 | =head2 Archive::Tar->can_handle_compressed_files |
1272 | |
1273 | A simple checking routine, which will return true if C<Archive::Tar> |
1274 | is able to uncompress compressed archives on the fly with C<IO::Zlib>, |
1275 | or false if C<IO::Zlib> is not installed. |
1276 | |
1277 | You can use this as a shortcut to determine whether C<Archive::Tar> |
1278 | will do what you think before passing compressed archives to its |
1279 | C<read> method. |
1280 | |
1281 | =cut |
1282 | |
1283 | sub can_handle_compressed_files { return ZLIB ? 1 : 0 } |
1284 | |
1285 | sub no_string_support { |
1286 | croak("You have to install IO::String to support writing archives to strings"); |
1287 | } |
1288 | |
1289 | 1; |
1290 | |
1291 | __END__ |
1292 | |
1293 | =head1 GLOBAL VARIABLES |
1294 | |
1295 | =head2 $Archive::Tar::FOLLOW_SYMLINK |
1296 | |
1297 | Set this variable to C<1> to make C<Archive::Tar> effectively make a |
1298 | copy of the file when extracting. Default is C<0>, which |
1299 | means the symlink stays intact. Of course, you will have to pack the |
1300 | file linked to as well. |
1301 | |
1302 | This option is checked when you write out the tarfile using C<write> |
1303 | or C<create_archive>. |
1304 | |
1305 | This works just like C</bin/tar>'s C<-h> option. |
1306 | |
1307 | =head2 $Archive::Tar::CHOWN |
1308 | |
1309 | By default, C<Archive::Tar> will try to C<chown> your files if it is |
1310 | able to. In some cases, this may not be desired. In that case, set |
1311 | this variable to C<0> to disable C<chown>-ing, even if it were |
1312 | possible. |
1313 | |
1314 | The default is C<1>. |
1315 | |
1316 | =head2 $Archive::Tar::CHMOD |
1317 | |
1318 | By default, C<Archive::Tar> will try to C<chmod> your files to |
1319 | whatever mode was specified for the particular file in the archive. |
1320 | In some cases, this may not be desired. In that case, set this |
1321 | variable to C<0> to disable C<chmod>-ing. |
1322 | |
1323 | The default is C<1>. |
1324 | |
1325 | =head2 $Archive::Tar::DO_NOT_USE_PREFIX |
1326 | |
1327 | By default, C<Archive::Tar> will try to put paths that are over |
1328 | 100 characters in the C<prefix> field of your tar header. However, |
1329 | some older tar programs do not implement this spec. To retain |
1330 | compatibility with these older versions, you can set the |
1331 | C<$DO_NOT_USE_PREFIX> variable to a true value, and C<Archive::Tar> |
1332 | will use an alternate way of dealing with paths over 100 characters |
1333 | by using the C<GNU Extended Header> feature. |
1334 | |
1335 | The default is C<0>. |
1336 | |
1337 | =head2 $Archive::Tar::DEBUG |
1338 | |
1339 | Set this variable to C<1> to always get the C<Carp::longmess> output |
1340 | of the warnings, instead of the regular C<carp>. This is the same |
1341 | message you would get by doing: |
1342 | |
1343 | $tar->error(1); |
1344 | |
1345 | Defaults to C<0>. |
1346 | |
1347 | =head2 $Archive::Tar::WARN |
1348 | |
1349 | Set this variable to C<0> if you do not want any warnings printed. |
1350 | Personally I recommend against doing this, but people asked for the |
1351 | option. Also, be advised that this is of course not threadsafe. |
1352 | |
1353 | Defaults to C<1>. |
1354 | |
1355 | =head2 $Archive::Tar::error |
1356 | |
1357 | Holds the last reported error. Kept for historical reasons, but its |
1358 | use is very much discouraged. Use the C<error()> method instead: |
1359 | |
1360 | warn $tar->error unless $tar->extract; |
1361 | |
1362 | =head2 $Archive::Tar::HAS_PERLIO |
1363 | |
1364 | This variable holds a boolean indicating if we currently have |
1365 | C<perlio> support loaded. This will be enabled for any perl |
1366 | greater than C<5.8> compiled with C<perlio>. |
1367 | |
1368 | If you feel strongly about disabling it, set this variable to |
1369 | C<false>. Note that you will then need C<IO::String> installed |
1370 | to support writing stringified archives. |
1371 | |
1372 | Don't change this variable unless you B<really> know what you're |
1373 | doing. |
1374 | |
1375 | =head2 $Archive::Tar::HAS_IO_STRING |
1376 | |
1377 | This variable holds a boolean indicating if we currently have |
1378 | C<IO::String> support loaded. This will be enabled for any perl |
1379 | that has a loadable C<IO::String> module. |
1380 | |
1381 | If you feel strongly about disabling it, set this variable to |
1382 | C<false>. Note that you will then need C<perlio> support from |
1383 | your perl to be able to write stringified archives. |
1384 | |
1385 | Don't change this variable unless you B<really> know what you're |
1386 | doing. |
1387 | |
1388 | =head1 FAQ |
1389 | |
1390 | =over 4 |
1391 | |
1392 | =item What's the minimum perl version required to run Archive::Tar? |
1393 | |
1394 | You will need perl version 5.005_03 or newer. |
1395 | |
1396 | =item Isn't Archive::Tar slow? |
1397 | |
1398 | Yes it is. It's pure perl, so it's a lot slower then your C</bin/tar> |
1399 | However, it's very portable. If speed is an issue, consider using |
1400 | C</bin/tar> instead. |
1401 | |
1402 | =item Isn't Archive::Tar heavier on memory than /bin/tar? |
1403 | |
1404 | Yes it is, see previous answer. Since C<Compress::Zlib> and therefore |
1405 | C<IO::Zlib> doesn't support C<seek> on their filehandles, there is little |
1406 | choice but to read the archive into memory. |
1407 | This is ok if you want to do in-memory manipulation of the archive. |
1408 | If you just want to extract, use the C<extract_archive> class method |
1409 | instead. It will optimize and write to disk immediately. |
1410 | |
1411 | =item Can't you lazy-load data instead? |
1412 | |
1413 | No, not easily. See previous question. |
1414 | |
1415 | =item How much memory will an X kb tar file need? |
1416 | |
1417 | Probably more than X kb, since it will all be read into memory. If |
1418 | this is a problem, and you don't need to do in memory manipulation |
1419 | of the archive, consider using C</bin/tar> instead. |
1420 | |
1421 | =item What do you do with unsupported filetypes in an archive? |
1422 | |
1423 | C<Unix> has a few filetypes that aren't supported on other platforms, |
1424 | like C<Win32>. If we encounter a C<hardlink> or C<symlink> we'll just |
1425 | try to make a copy of the original file, rather than throwing an error. |
1426 | |
1427 | This does require you to read the entire archive in to memory first, |
1428 | since otherwise we wouldn't know what data to fill the copy with. |
1429 | (This means that you cannot use the class methods on archives that |
1430 | have incompatible filetypes and still expect things to work). |
1431 | |
1432 | For other filetypes, like C<chardevs> and C<blockdevs> we'll warn that |
1433 | the extraction of this particular item didn't work. |
1434 | |
1435 | =back |
1436 | |
1437 | =head1 TODO |
1438 | |
1439 | =over 4 |
1440 | |
1441 | =item Check if passed in handles are open for read/write |
1442 | |
1443 | Currently I don't know of any portable pure perl way to do this. |
1444 | Suggestions welcome. |
1445 | |
1446 | =back |
1447 | |
1448 | =head1 AUTHOR |
1449 | |
1450 | This module by |
1451 | Jos Boumans E<lt>kane@cpan.orgE<gt>. |
1452 | |
1453 | =head1 ACKNOWLEDGEMENTS |
1454 | |
1455 | Thanks to Sean Burke, Chris Nandor, Chip Salzenberg, Tim Heaney and |
1456 | especially Andrew Savige for their help and suggestions. |
1457 | |
1458 | =head1 COPYRIGHT |
1459 | |
1460 | This module is |
1461 | copyright (c) 2002 Jos Boumans E<lt>kane@cpan.orgE<gt>. |
1462 | All rights reserved. |
1463 | |
1464 | This library is free software; |
1465 | you may redistribute and/or modify it under the same |
1466 | terms as Perl itself. |
1467 | |
1468 | =cut |