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Diffstat (limited to 'lib/Archive/Extract.pm')
| -rw-r--r-- | lib/Archive/Extract.pm | 1694 |
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diff --git a/lib/Archive/Extract.pm b/lib/Archive/Extract.pm new file mode 100644 index 0000000..e88cf11 --- /dev/null +++ b/lib/Archive/Extract.pm @@ -0,0 +1,1694 @@ +package Archive::Extract; +use if $] > 5.017, 'deprecate'; + +use strict; + +use Cwd qw[cwd chdir]; +use Carp qw[carp]; +use IPC::Cmd qw[run can_run]; +use FileHandle; +use File::Path qw[mkpath]; +use File::Spec; +use File::Basename qw[dirname basename]; +use Params::Check qw[check]; +use Module::Load::Conditional qw[can_load check_install]; +use Locale::Maketext::Simple Style => 'gettext'; + +### solaris has silly /bin/tar output ### +use constant ON_SOLARIS => $^O eq 'solaris' ? 1 : 0; +use constant ON_NETBSD => $^O eq 'netbsd' ? 1 : 0; +use constant ON_OPENBSD => $^O =~ m!^(openbsd|bitrig)$! ? 1 : 0; +use constant ON_FREEBSD => $^O =~ m!^(free|midnight|dragonfly)(bsd)?$! ? 1 : 0; +use constant ON_LINUX => $^O eq 'linux' ? 1 : 0; +use constant FILE_EXISTS => sub { -e $_[0] ? 1 : 0 }; + +### VMS may require quoting upper case command options +use constant ON_VMS => $^O eq 'VMS' ? 1 : 0; + +### Windows needs special treatment of Tar options +use constant ON_WIN32 => $^O eq 'MSWin32' ? 1 : 0; + +### we can't use this extraction method, because of missing +### modules/binaries: +use constant METHOD_NA => []; + +### If these are changed, update @TYPES and the new() POD +use constant TGZ => 'tgz'; +use constant TAR => 'tar'; +use constant GZ => 'gz'; +use constant ZIP => 'zip'; +use constant BZ2 => 'bz2'; +use constant TBZ => 'tbz'; +use constant Z => 'Z'; +use constant LZMA => 'lzma'; +use constant XZ => 'xz'; +use constant TXZ => 'txz'; + +use vars qw[$VERSION $PREFER_BIN $PROGRAMS $WARN $DEBUG + $_ALLOW_BIN $_ALLOW_PURE_PERL $_ALLOW_TAR_ITER + ]; + +$VERSION = '0.76'; +$PREFER_BIN = 0; +$WARN = 1; +$DEBUG = 0; +$_ALLOW_PURE_PERL = 1; # allow pure perl extractors +$_ALLOW_BIN = 1; # allow binary extractors +$_ALLOW_TAR_ITER = 1; # try to use Archive::Tar->iter if available + +# same as all constants +my @Types = ( TGZ, TAR, GZ, ZIP, BZ2, TBZ, Z, LZMA, XZ, TXZ ); + +local $Params::Check::VERBOSE = $Params::Check::VERBOSE = 1; + +=pod + +=head1 NAME + +Archive::Extract - A generic archive extracting mechanism + +=head1 SYNOPSIS + + use Archive::Extract; + + ### build an Archive::Extract object ### + my $ae = Archive::Extract->new( archive => 'foo.tgz' ); + + ### extract to cwd() ### + my $ok = $ae->extract; + + ### extract to /tmp ### + my $ok = $ae->extract( to => '/tmp' ); + + ### what if something went wrong? + my $ok = $ae->extract or die $ae->error; + + ### files from the archive ### + my $files = $ae->files; + + ### dir that was extracted to ### + my $outdir = $ae->extract_path; + + + ### quick check methods ### + $ae->is_tar # is it a .tar file? + $ae->is_tgz # is it a .tar.gz or .tgz file? + $ae->is_gz; # is it a .gz file? + $ae->is_zip; # is it a .zip file? + $ae->is_bz2; # is it a .bz2 file? + $ae->is_tbz; # is it a .tar.bz2 or .tbz file? + $ae->is_lzma; # is it a .lzma file? + $ae->is_xz; # is it a .xz file? + $ae->is_txz; # is it a .tar.xz or .txz file? + + ### absolute path to the archive you provided ### + $ae->archive; + + ### commandline tools, if found ### + $ae->bin_tar # path to /bin/tar, if found + $ae->bin_gzip # path to /bin/gzip, if found + $ae->bin_unzip # path to /bin/unzip, if found + $ae->bin_bunzip2 # path to /bin/bunzip2 if found + $ae->bin_unlzma # path to /bin/unlzma if found + $ae->bin_unxz # path to /bin/unxz if found + +=head1 DESCRIPTION + +Archive::Extract is a generic archive extraction mechanism. + +It allows you to extract any archive file of the type .tar, .tar.gz, +.gz, .Z, tar.bz2, .tbz, .bz2, .zip, .xz,, .txz, .tar.xz or .lzma +without having to worry how it +does so, or use different interfaces for each type by using either +perl modules, or commandline tools on your system. + +See the C<HOW IT WORKS> section further down for details. + +=cut + + +### see what /bin/programs are available ### +$PROGRAMS = {}; +CMD: for my $pgm (qw[tar unzip gzip bunzip2 uncompress unlzma unxz]) { + if ( $pgm eq 'unzip' and ON_FREEBSD and my $unzip = can_run('info-unzip') ) { + $PROGRAMS->{$pgm} = $unzip; + next CMD; + } + if ( $pgm eq 'unzip' and ( ON_NETBSD or ON_FREEBSD ) ) { + local $IPC::Cmd::INSTANCES = 1; + ($PROGRAMS->{$pgm}) = grep { ON_NETBSD ? m!/usr/pkg/! : m!/usr/local! } can_run($pgm); + next CMD; + } + if ( $pgm eq 'unzip' and ON_LINUX ) { + # Check if 'unzip' is busybox masquerading + local $IPC::Cmd::INSTANCES = 1; + my $opt = ON_VMS ? '"-Z"' : '-Z'; + ($PROGRAMS->{$pgm}) = grep { scalar run(command=> [ $_, $opt, '-1' ]) } can_run($pgm); + next CMD; + } + if ( $pgm eq 'tar' and ( ON_OPENBSD || ON_SOLARIS || ON_NETBSD ) ) { + # try gtar first + next CMD if $PROGRAMS->{$pgm} = can_run('gtar'); + } + $PROGRAMS->{$pgm} = can_run($pgm); +} + +### mapping from types to extractor methods ### +my $Mapping = { # binary program # pure perl module + is_tgz => { bin => '_untar_bin', pp => '_untar_at' }, + is_tar => { bin => '_untar_bin', pp => '_untar_at' }, + is_gz => { bin => '_gunzip_bin', pp => '_gunzip_cz' }, + is_zip => { bin => '_unzip_bin', pp => '_unzip_az' }, + is_tbz => { bin => '_untar_bin', pp => '_untar_at' }, + is_bz2 => { bin => '_bunzip2_bin', pp => '_bunzip2_bz2'}, + is_Z => { bin => '_uncompress_bin', pp => '_gunzip_cz' }, + is_lzma => { bin => '_unlzma_bin', pp => '_unlzma_cz' }, + is_xz => { bin => '_unxz_bin', pp => '_unxz_cz' }, + is_txz => { bin => '_untar_bin', pp => '_untar_at' }, +}; + +{ ### use subs so we re-generate array refs etc for the no-override flags + ### if we don't, then we reuse the same arrayref, meaning objects store + ### previous errors + my $tmpl = { + archive => sub { { required => 1, allow => FILE_EXISTS } }, + type => sub { { default => '', allow => [ @Types ] } }, + _error_msg => sub { { no_override => 1, default => [] } }, + _error_msg_long => sub { { no_override => 1, default => [] } }, + }; + + ### build accessors ### + for my $method( keys %$tmpl, + qw[_extractor _gunzip_to files extract_path], + ) { + no strict 'refs'; + *$method = sub { + my $self = shift; + $self->{$method} = $_[0] if @_; + return $self->{$method}; + } + } + +=head1 METHODS + +=head2 $ae = Archive::Extract->new(archive => '/path/to/archive',[type => TYPE]) + +Creates a new C<Archive::Extract> object based on the archive file you +passed it. Automatically determines the type of archive based on the +extension, but you can override that by explicitly providing the +C<type> argument. + +Valid values for C<type> are: + +=over 4 + +=item tar + +Standard tar files, as produced by, for example, C</bin/tar>. +Corresponds to a C<.tar> suffix. + +=item tgz + +Gzip compressed tar files, as produced by, for example C</bin/tar -z>. +Corresponds to a C<.tgz> or C<.tar.gz> suffix. + +=item gz + +Gzip compressed file, as produced by, for example C</bin/gzip>. +Corresponds to a C<.gz> suffix. + +=item Z + +Lempel-Ziv compressed file, as produced by, for example C</bin/compress>. +Corresponds to a C<.Z> suffix. + +=item zip + +Zip compressed file, as produced by, for example C</bin/zip>. +Corresponds to a C<.zip>, C<.jar> or C<.par> suffix. + +=item bz2 + +Bzip2 compressed file, as produced by, for example, C</bin/bzip2>. +Corresponds to a C<.bz2> suffix. + +=item tbz + +Bzip2 compressed tar file, as produced by, for example C</bin/tar -j>. +Corresponds to a C<.tbz> or C<.tar.bz2> suffix. + +=item lzma + +Lzma compressed file, as produced by C</bin/lzma>. +Corresponds to a C<.lzma> suffix. + +=item xz + +Xz compressed file, as produced by C</bin/xz>. +Corresponds to a C<.xz> suffix. + +=item txz + +Xz compressed tar file, as produced by, for example C</bin/tar -J>. +Corresponds to a C<.txz> or C<.tar.xz> suffix. + +=back + +Returns a C<Archive::Extract> object on success, or false on failure. + +=cut + + ### constructor ### + sub new { + my $class = shift; + my %hash = @_; + + ### see above why we use subs here and generate the template; + ### it's basically to not re-use arrayrefs + my %utmpl = map { $_ => $tmpl->{$_}->() } keys %$tmpl; + + my $parsed = check( \%utmpl, \%hash ) or return; + + ### make sure we have an absolute path ### + my $ar = $parsed->{archive} = File::Spec->rel2abs( $parsed->{archive} ); + + ### figure out the type, if it wasn't already specified ### + unless ( $parsed->{type} ) { + $parsed->{type} = + $ar =~ /.+?\.(?:tar\.gz|tgz)$/i ? TGZ : + $ar =~ /.+?\.gz$/i ? GZ : + $ar =~ /.+?\.tar$/i ? TAR : + $ar =~ /.+?\.(zip|jar|ear|war|par)$/i ? ZIP : + $ar =~ /.+?\.(?:tbz2?|tar\.bz2?)$/i ? TBZ : + $ar =~ /.+?\.bz2$/i ? BZ2 : + $ar =~ /.+?\.Z$/ ? Z : + $ar =~ /.+?\.lzma$/ ? LZMA : + $ar =~ /.+?\.(?:txz|tar\.xz)$/i ? TXZ : + $ar =~ /.+?\.xz$/ ? XZ : + ''; + + } + + bless $parsed, $class; + + ### don't know what type of file it is + ### XXX this *has* to be an object call, not a package call + return $parsed->_error(loc("Cannot determine file type for '%1'", + $parsed->{archive} )) unless $parsed->{type}; + return $parsed; + } +} + +=head2 $ae->extract( [to => '/output/path'] ) + +Extracts the archive represented by the C<Archive::Extract> object to +the path of your choice as specified by the C<to> argument. Defaults to +C<cwd()>. + +Since C<.gz> files never hold a directory, but only a single file; if +the C<to> argument is an existing directory, the file is extracted +there, with its C<.gz> suffix stripped. +If the C<to> argument is not an existing directory, the C<to> argument +is understood to be a filename, if the archive type is C<gz>. +In the case that you did not specify a C<to> argument, the output +file will be the name of the archive file, stripped from its C<.gz> +suffix, in the current working directory. + +C<extract> will try a pure perl solution first, and then fall back to +commandline tools if they are available. See the C<GLOBAL VARIABLES> +section below on how to alter this behaviour. + +It will return true on success, and false on failure. + +On success, it will also set the follow attributes in the object: + +=over 4 + +=item $ae->extract_path + +This is the directory that the files where extracted to. + +=item $ae->files + +This is an array ref with the paths of all the files in the archive, +relative to the C<to> argument you specified. +To get the full path to an extracted file, you would use: + + File::Spec->catfile( $to, $ae->files->[0] ); + +Note that all files from a tar archive will be in unix format, as per +the tar specification. + +=back + +=cut + +sub extract { + my $self = shift; + my %hash = @_; + + ### reset error messages + $self->_error_msg( [] ); + $self->_error_msg_long( [] ); + + my $to; + my $tmpl = { + to => { default => '.', store => \$to } + }; + + check( $tmpl, \%hash ) or return; + + ### so 'to' could be a file or a dir, depending on whether it's a .gz + ### file, or basically anything else. + ### so, check that, then act accordingly. + ### set an accessor specifically so _gunzip can know what file to extract + ### to. + my $dir; + { ### a foo.gz file + if( $self->is_gz or $self->is_bz2 or $self->is_Z or $self->is_lzma or $self->is_xz ) { + + my $cp = $self->archive; $cp =~ s/\.(?:gz|bz2?|Z|lzma|xz)$//i; + + ### to is a dir? + if ( -d $to ) { + $dir = $to; + $self->_gunzip_to( basename($cp) ); + + ### then it's a filename + } else { + $dir = dirname($to); + $self->_gunzip_to( basename($to) ); + } + + ### not a foo.gz file + } else { + $dir = $to; + } + } + + ### make the dir if it doesn't exist ### + unless( -d $dir ) { + eval { mkpath( $dir ) }; + + return $self->_error(loc("Could not create path '%1': %2", $dir, $@)) + if $@; + } + + ### get the current dir, to restore later ### + my $cwd = cwd(); + + my $ok = 1; + EXTRACT: { + + ### chdir to the target dir ### + unless( chdir $dir ) { + $self->_error(loc("Could not chdir to '%1': %2", $dir, $!)); + $ok = 0; last EXTRACT; + } + + ### set files to an empty array ref, so there's always an array + ### ref IN the accessor, to avoid errors like: + ### Can't use an undefined value as an ARRAY reference at + ### ../lib/Archive/Extract.pm line 742. (rt #19815) + $self->files( [] ); + + ### find out the dispatch methods needed for this type of + ### archive. Do a $self->is_XXX to figure out the type, then + ### get the hashref with bin + pure perl dispatchers. + my ($map) = map { $Mapping->{$_} } grep { $self->$_ } keys %$Mapping; + + ### add pure perl extractor if allowed & add bin extractor if allowed + my @methods; + push @methods, $map->{'pp'} if $_ALLOW_PURE_PERL; + push @methods, $map->{'bin'} if $_ALLOW_BIN; + + ### reverse it if we prefer bin extractors + @methods = reverse @methods if $PREFER_BIN; + + my($na, $fail); + for my $method (@methods) { + $self->debug( "# Extracting with ->$method\n" ); + + my $rv = $self->$method; + + ### a positive extraction + if( $rv and $rv ne METHOD_NA ) { + $self->debug( "# Extraction succeeded\n" ); + $self->_extractor($method); + last; + + ### method is not available + } elsif ( $rv and $rv eq METHOD_NA ) { + $self->debug( "# Extraction method not available\n" ); + $na++; + } else { + $self->debug( "# Extraction method failed\n" ); + $fail++; + } + } + + ### warn something went wrong if we didn't get an extractor + unless( $self->_extractor ) { + my $diag = $fail ? loc("Extract failed due to errors") : + $na ? loc("Extract failed; no extractors available") : + ''; + + $self->_error($diag); + $ok = 0; + } + } + + ### and chdir back ### + unless( chdir $cwd ) { + $self->_error(loc("Could not chdir back to start dir '%1': %2'", + $cwd, $!)); + } + + return $ok; +} + +=pod + +=head1 ACCESSORS + +=head2 $ae->error([BOOL]) + +Returns the last encountered error as string. +Pass it a true value to get the C<Carp::longmess()> output instead. + +=head2 $ae->extract_path + +This is the directory the archive got extracted to. +See C<extract()> for details. + +=head2 $ae->files + +This is an array ref holding all the paths from the archive. +See C<extract()> for details. + +=head2 $ae->archive + +This is the full path to the archive file represented by this +C<Archive::Extract> object. + +=head2 $ae->type + +This is the type of archive represented by this C<Archive::Extract> +object. See accessors below for an easier way to use this. +See the C<new()> method for details. + +=head2 $ae->types + +Returns a list of all known C<types> for C<Archive::Extract>'s +C<new> method. + +=cut + +sub types { return @Types } + +=head2 $ae->is_tgz + +Returns true if the file is of type C<.tar.gz>. +See the C<new()> method for details. + +=head2 $ae->is_tar + +Returns true if the file is of type C<.tar>. +See the C<new()> method for details. + +=head2 $ae->is_gz + +Returns true if the file is of type C<.gz>. +See the C<new()> method for details. + +=head2 $ae->is_Z + +Returns true if the file is of type C<.Z>. +See the C<new()> method for details. + +=head2 $ae->is_zip + +Returns true if the file is of type C<.zip>. +See the C<new()> method for details. + +=head2 $ae->is_lzma + +Returns true if the file is of type C<.lzma>. +See the C<new()> method for details. + +=head2 $ae->is_xz + +Returns true if the file is of type C<.xz>. +See the C<new()> method for details. + +=cut + +### quick check methods ### +sub is_tgz { return $_[0]->type eq TGZ } +sub is_tar { return $_[0]->type eq TAR } +sub is_gz { return $_[0]->type eq GZ } +sub is_zip { return $_[0]->type eq ZIP } +sub is_tbz { return $_[0]->type eq TBZ } +sub is_bz2 { return $_[0]->type eq BZ2 } +sub is_Z { return $_[0]->type eq Z } +sub is_lzma { return $_[0]->type eq LZMA } +sub is_xz { return $_[0]->type eq XZ } +sub is_txz { return $_[0]->type eq TXZ } + +=pod + +=head2 $ae->bin_tar + +Returns the full path to your tar binary, if found. + +=head2 $ae->bin_gzip + +Returns the full path to your gzip binary, if found + +=head2 $ae->bin_unzip + +Returns the full path to your unzip binary, if found + +=head2 $ae->bin_unlzma + +Returns the full path to your unlzma binary, if found + +=head2 $ae->bin_unxz + +Returns the full path to your unxz binary, if found + +=cut + +### paths to commandline tools ### +sub bin_gzip { return $PROGRAMS->{'gzip'} if $PROGRAMS->{'gzip'} } +sub bin_unzip { return $PROGRAMS->{'unzip'} if $PROGRAMS->{'unzip'} } +sub bin_tar { return $PROGRAMS->{'tar'} if $PROGRAMS->{'tar'} } +sub bin_bunzip2 { return $PROGRAMS->{'bunzip2'} if $PROGRAMS->{'bunzip2'} } +sub bin_uncompress { return $PROGRAMS->{'uncompress'} + if $PROGRAMS->{'uncompress'} } +sub bin_unlzma { return $PROGRAMS->{'unlzma'} if $PROGRAMS->{'unlzma'} } +sub bin_unxz { return $PROGRAMS->{'unxz'} if $PROGRAMS->{'unxz'} } + +=head2 $bool = $ae->have_old_bunzip2 + +Older versions of C</bin/bunzip2>, from before the C<bunzip2 1.0> release, +require all archive names to end in C<.bz2> or it will not extract +them. This method checks if you have a recent version of C<bunzip2> +that allows any extension, or an older one that doesn't. + +=cut + +sub have_old_bunzip2 { + my $self = shift; + + ### no bunzip2? no old bunzip2 either :) + return unless $self->bin_bunzip2; + + ### if we can't run this, we can't be sure if it's too old or not + ### XXX stupid stupid stupid bunzip2 doesn't understand --version + ### is not a request to extract data: + ### $ bunzip2 --version + ### bzip2, a block-sorting file compressor. Version 1.0.2, 30-Dec-2001. + ### [...] + ### bunzip2: I won't read compressed data from a terminal. + ### bunzip2: For help, type: `bunzip2 --help'. + ### $ echo $? + ### 1 + ### HATEFUL! + + ### double hateful: bunzip2 --version also hangs if input is a pipe + ### See #32370: Archive::Extract will hang if stdin is a pipe [+PATCH] + ### So, we have to provide *another* argument which is a fake filename, + ### just so it wont try to read from stdin to print its version.. + ### *sigh* + ### Even if the file exists, it won't clobber or change it. + my $buffer; + scalar run( + command => [$self->bin_bunzip2, '--version', 'NoSuchFile'], + verbose => 0, + buffer => \$buffer + ); + + ### no output + return unless $buffer; + + my ($version) = $buffer =~ /version \s+ (\d+)/ix; + + return 1 if $version < 1; + return; +} + +################################# +# +# Untar code +# +################################# + +### annoying issue with (gnu) tar on win32, as illustrated by this +### bug: https://rt.cpan.org/Ticket/Display.html?id=40138 +### which shows that (gnu) tar will interpret a file name with a : +### in it as a remote file name, so C:\tmp\foo.txt is interpreted +### as a remote shell, and the extract fails. +{ my @ExtraTarFlags; + if( ON_WIN32 and my $cmd = __PACKAGE__->bin_tar ) { + + ### if this is gnu tar we are running, we need to use --force-local + push @ExtraTarFlags, '--force-local' if `$cmd --version` =~ /gnu tar/i; + } + + + ### use /bin/tar to extract ### + sub _untar_bin { + my $self = shift; + + ### check for /bin/tar ### + ### check for /bin/gzip if we need it ### + ### if any of the binaries are not available, return NA + { my $diag = !$self->bin_tar ? + loc("No '%1' program found", '/bin/tar') : + $self->is_tgz && !$self->bin_gzip ? + loc("No '%1' program found", '/bin/gzip') : + $self->is_tbz && !$self->bin_bunzip2 ? + loc("No '%1' program found", '/bin/bunzip2') : + $self->is_txz && !$self->bin_unxz ? + loc("No '%1' program found", '/bin/unxz') : + ''; + + if( $diag ) { + $self->_error( $diag ); + return METHOD_NA; + } + } + + ### XXX figure out how to make IPC::Run do this in one call -- + ### currently i don't know how to get output of a command after a pipe + ### trapped in a scalar. Mailed barries about this 5th of june 2004. + + ### see what command we should run, based on whether + ### it's a .tgz or .tar + + ### GNU tar can't handled VMS filespecs, but VMSTAR can handle Unix filespecs. + my $archive = $self->archive; + $archive = VMS::Filespec::unixify($archive) if ON_VMS; + + ### XXX solaris tar and bsdtar are having different outputs + ### depending whether you run with -x or -t + ### compensate for this insanity by running -t first, then -x + { my $cmd = + $self->is_tgz ? [$self->bin_gzip, '-c', '-d', '-f', $archive, '|', + $self->bin_tar, '-tf', '-'] : + $self->is_tbz ? [$self->bin_bunzip2, '-cd', $archive, '|', + $self->bin_tar, '-tf', '-'] : + $self->is_txz ? [$self->bin_unxz, '-cd', $archive, '|', + $self->bin_tar, '-tf', '-'] : + [$self->bin_tar, @ExtraTarFlags, '-tf', $archive]; + + ### run the command + ### newer versions of 'tar' (1.21 and up) now print record size + ### to STDERR as well if v OR t is given (used to be both). This + ### is a 'feature' according to the changelog, so we must now only + ### inspect STDOUT, otherwise, failures like these occur: + ### http://www.cpantesters.org/cpan/report/3230366 + my $buffer = ''; + my @out = run( command => $cmd, + buffer => \$buffer, + verbose => $DEBUG ); + + ### command was unsuccessful + unless( $out[0] ) { + return $self->_error(loc( + "Error listing contents of archive '%1': %2", + $archive, $buffer )); + } + + ### no buffers available? + if( !IPC::Cmd->can_capture_buffer and !$buffer ) { + $self->_error( $self->_no_buffer_files( $archive ) ); + + } else { + ### if we're on solaris we /might/ be using /bin/tar, which has + ### a weird output format... we might also be using + ### /usr/local/bin/tar, which is gnu tar, which is perfectly + ### fine... so we have to do some guessing here =/ + my @files = map { chomp; + !ON_SOLARIS ? $_ + : (m|^ x \s+ # 'xtract' -- sigh + (.+?), # the actual file name + \s+ [\d,.]+ \s bytes, + \s+ [\d,.]+ \s tape \s blocks + |x ? $1 : $_); + + ### only STDOUT, see above. Sometimes, extra whitespace + ### is present, so make sure we only pick lines with + ### a length + } grep { length } map { split $/, $_ } join '', @{$out[3]}; + + ### store the files that are in the archive ### + $self->files(\@files); + } + } + + ### now actually extract it ### + { my $cmd = + $self->is_tgz ? [$self->bin_gzip, '-c', '-d', '-f', $archive, '|', + $self->bin_tar, '-xf', '-'] : + $self->is_tbz ? [$self->bin_bunzip2, '-cd', $archive, '|', + $self->bin_tar, '-xf', '-'] : + $self->is_txz ? [$self->bin_unxz, '-cd', $archive, '|', + $self->bin_tar, '-xf', '-'] : + [$self->bin_tar, @ExtraTarFlags, '-xf', $archive]; + + my $buffer = ''; + unless( scalar run( command => $cmd, + buffer => \$buffer, + verbose => $DEBUG ) + ) { + return $self->_error(loc("Error extracting archive '%1': %2", + $archive, $buffer )); + } + + ### we might not have them, due to lack of buffers + if( $self->files ) { + ### now that we've extracted, figure out where we extracted to + my $dir = $self->__get_extract_dir( $self->files ); + + ### store the extraction dir ### + $self->extract_path( $dir ); + } + } + + ### we got here, no error happened + return 1; + } +} + + +### use archive::tar to extract ### +sub _untar_at { + my $self = shift; + + ### Loading Archive::Tar is going to set it to 1, so make it local + ### within this block, starting with its initial value. Whatever + ### Achive::Tar does will be undone when we return. + ### + ### Also, later, set $Archive::Tar::WARN to $Archive::Extract::WARN + ### so users don't have to even think about this variable. If they + ### do, they still get their set value outside of this call. + local $Archive::Tar::WARN = $Archive::Tar::WARN; + + ### we definitely need Archive::Tar, so load that first + { my $use_list = { 'Archive::Tar' => '0.0' }; + + unless( can_load( modules => $use_list ) ) { + + $self->_error(loc("You do not have '%1' installed - " . + "Please install it as soon as possible.", + 'Archive::Tar')); + + return METHOD_NA; + } + } + + ### we might pass it a filehandle if it's a .tbz file.. + my $fh_to_read = $self->archive; + + ### we will need Compress::Zlib too, if it's a tgz... and IO::Zlib + ### if A::T's version is 0.99 or higher + if( $self->is_tgz ) { + my $use_list = { 'Compress::Zlib' => '0.0' }; + $use_list->{ 'IO::Zlib' } = '0.0' + if $Archive::Tar::VERSION >= '0.99'; + + unless( can_load( modules => $use_list ) ) { + my $which = join '/', sort keys %$use_list; + + $self->_error(loc( + "You do not have '%1' installed - Please ". + "install it as soon as possible.", $which) + ); + + return METHOD_NA; + } + + } elsif ( $self->is_tbz ) { + my $use_list = { 'IO::Uncompress::Bunzip2' => '0.0' }; + unless( can_load( modules => $use_list ) ) { + $self->_error(loc( + "You do not have '%1' installed - Please " . + "install it as soon as possible.", + 'IO::Uncompress::Bunzip2') + ); + + return METHOD_NA; + } + + my $bz = IO::Uncompress::Bunzip2->new( $self->archive ) or + return $self->_error(loc("Unable to open '%1': %2", + $self->archive, + $IO::Uncompress::Bunzip2::Bunzip2Error)); + + $fh_to_read = $bz; + } elsif ( $self->is_txz ) { + my $use_list = { 'IO::Uncompress::UnXz' => '0.0' }; + unless( can_load( modules => $use_list ) ) { + $self->_error(loc( + "You do not have '%1' installed - Please " . + "install it as soon as possible.", + 'IO::Uncompress::UnXz') + ); + + return METHOD_NA; + } + + my $xz = IO::Uncompress::UnXz->new( $self->archive ) or + return $self->_error(loc("Unable to open '%1': %2", + $self->archive, + $IO::Uncompress::UnXz::UnXzError)); + + $fh_to_read = $xz; + } + + my @files; + { + ### $Archive::Tar::WARN is 1 by default in Archive::Tar, but we've + ### localized $Archive::Tar::WARN already. + $Archive::Tar::WARN = $Archive::Extract::WARN; + + ### only tell it it's compressed if it's a .tgz, as we give it a file + ### handle if it's a .tbz + my @read = ( $fh_to_read, ( $self->is_tgz ? 1 : 0 ) ); + + ### for version of Archive::Tar > 1.04 + local $Archive::Tar::CHOWN = 0; + + ### use the iterator if we can. it's a feature of A::T 1.40 and up + if ( $_ALLOW_TAR_ITER && Archive::Tar->can( 'iter' ) ) { + + my $next; + unless ( $next = Archive::Tar->iter( @read ) ) { + return $self->_error(loc( + "Unable to read '%1': %2", $self->archive, + $Archive::Tar::error)); + } + + while ( my $file = $next->() ) { + push @files, $file->full_path; + + $file->extract or return $self->_error(loc( + "Unable to read '%1': %2", + $self->archive, + $Archive::Tar::error)); + } + + ### older version, read the archive into memory + } else { + + my $tar = Archive::Tar->new(); + + unless( $tar->read( @read ) ) { + return $self->_error(loc("Unable to read '%1': %2", + $self->archive, $Archive::Tar::error)); + } + + ### workaround to prevent Archive::Tar from setting uid, which + ### is a potential security hole. -autrijus + ### have to do it here, since A::T needs to be /loaded/ first ### + { no strict 'refs'; local $^W; + + ### older versions of archive::tar <= 0.23 + *Archive::Tar::chown = sub {}; + } + + { local $^W; # quell 'splice() offset past end of array' warnings + # on older versions of A::T + + ### older archive::tar always returns $self, return value + ### slightly fux0r3d because of it. + $tar->extract or return $self->_error(loc( + "Unable to extract '%1': %2", + $self->archive, $Archive::Tar::error )); + } + + @files = $tar->list_files; + } + } + + my $dir = $self->__get_extract_dir( \@files ); + + ### store the files that are in the archive ### + $self->files(\@files); + + ### store the extraction dir ### + $self->extract_path( $dir ); + + ### check if the dir actually appeared ### + return 1 if -d $self->extract_path; + + ### no dir, we failed ### + return $self->_error(loc("Unable to extract '%1': %2", + $self->archive, $Archive::Tar::error )); +} + +################################# +# +# Gunzip code +# +################################# + +sub _gunzip_bin { + my $self = shift; + + ### check for /bin/gzip -- we need it ### + unless( $self->bin_gzip ) { + $self->_error(loc("No '%1' program found", '/bin/gzip')); + return METHOD_NA; + } + + my $fh = FileHandle->new('>'. $self->_gunzip_to) or + return $self->_error(loc("Could not open '%1' for writing: %2", + $self->_gunzip_to, $! )); + + my $cmd = [ $self->bin_gzip, '-c', '-d', '-f', $self->archive ]; + + my $buffer; + unless( scalar run( command => $cmd, + verbose => $DEBUG, + buffer => \$buffer ) + ) { + return $self->_error(loc("Unable to gunzip '%1': %2", + $self->archive, $buffer)); + } + + ### no buffers available? + if( !IPC::Cmd->can_capture_buffer and !$buffer ) { + $self->_error( $self->_no_buffer_content( $self->archive ) ); + } + + $self->_print($fh, $buffer) if defined $buffer; + + close $fh; + + ### set what files where extract, and where they went ### + $self->files( [$self->_gunzip_to] ); + $self->extract_path( File::Spec->rel2abs(cwd()) ); + + return 1; +} + +sub _gunzip_cz { + my $self = shift; + + my $use_list = { 'Compress::Zlib' => '0.0' }; + unless( can_load( modules => $use_list ) ) { + $self->_error(loc("You do not have '%1' installed - Please " . + "install it as soon as possible.", 'Compress::Zlib')); + return METHOD_NA; + } + + my $gz = Compress::Zlib::gzopen( $self->archive, "rb" ) or + return $self->_error(loc("Unable to open '%1': %2", + $self->archive, $Compress::Zlib::gzerrno)); + + my $fh = FileHandle->new('>'. $self->_gunzip_to) or + return $self->_error(loc("Could not open '%1' for writing: %2", + $self->_gunzip_to, $! )); + + my $buffer; + $self->_print($fh, $buffer) while $gz->gzread($buffer) > 0; + $fh->close; + + ### set what files where extract, and where they went ### + $self->files( [$self->_gunzip_to] ); + $self->extract_path( File::Spec->rel2abs(cwd()) ); + + return 1; +} + +################################# +# +# Uncompress code +# +################################# + +sub _uncompress_bin { + my $self = shift; + + ### check for /bin/gzip -- we need it ### + unless( $self->bin_uncompress ) { + $self->_error(loc("No '%1' program found", '/bin/uncompress')); + return METHOD_NA; + } + + my $fh = FileHandle->new('>'. $self->_gunzip_to) or + return $self->_error(loc("Could not open '%1' for writing: %2", + $self->_gunzip_to, $! )); + + my $cmd = [ $self->bin_uncompress, '-c', $self->archive ]; + + my $buffer; + unless( scalar run( command => $cmd, + verbose => $DEBUG, + buffer => \$buffer ) + ) { + return $self->_error(loc("Unable to uncompress '%1': %2", + $self->archive, $buffer)); + } + + ### no buffers available? + if( !IPC::Cmd->can_capture_buffer and !$buffer ) { + $self->_error( $self->_no_buffer_content( $self->archive ) ); + } + + $self->_print($fh, $buffer) if defined $buffer; + + close $fh; + + ### set what files where extract, and where they went ### + $self->files( [$self->_gunzip_to] ); + $self->extract_path( File::Spec->rel2abs(cwd()) ); + + return 1; +} + + +################################# +# +# Unzip code +# +################################# + + +sub _unzip_bin { + my $self = shift; + + ### check for /bin/gzip if we need it ### + unless( $self->bin_unzip ) { + $self->_error(loc("No '%1' program found", '/bin/unzip')); + return METHOD_NA; + } + + ### first, get the files.. it must be 2 different commands with 'unzip' :( + { ### on VMS, capital letter options have to be quoted. This is + ### reported by John Malmberg on P5P Tue 21 Aug 2007 05:05:11 + ### Subject: [patch@31735]Archive Extract fix on VMS. + my $opt = ON_VMS ? '"-Z"' : '-Z'; + my $cmd = [ $self->bin_unzip, $opt, '-1', $self->archive ]; + + my $buffer = ''; + unless( scalar run( command => $cmd, + verbose => $DEBUG, + buffer => \$buffer ) + ) { + return $self->_error(loc("Unable to unzip '%1': %2", + $self->archive, $buffer)); + } + + ### no buffers available? + if( !IPC::Cmd->can_capture_buffer and !$buffer ) { + $self->_error( $self->_no_buffer_files( $self->archive ) ); + + } else { + ### Annoyingly, pesky MSWin32 can either have 'native' tools + ### which have \r\n line endings or Cygwin-based tools which + ### have \n line endings. Jan Dubois suggested using this fix + my $split = ON_WIN32 ? qr/\r?\n/ : "\n"; + $self->files( [split $split, $buffer] ); + } + } + + ### now, extract the archive ### + { my $cmd = [ $self->bin_unzip, '-qq', '-o', $self->archive ]; + + my $buffer; + unless( scalar run( command => $cmd, + verbose => $DEBUG, + buffer => \$buffer ) + ) { + return $self->_error(loc("Unable to unzip '%1': %2", + $self->archive, $buffer)); + } + + if( scalar @{$self->files} ) { + my $files = $self->files; + my $dir = $self->__get_extract_dir( $files ); + + $self->extract_path( $dir ); + } + } + + return 1; +} + +sub _unzip_az { + my $self = shift; + + my $use_list = { 'Archive::Zip' => '0.0' }; + unless( can_load( modules => $use_list ) ) { + $self->_error(loc("You do not have '%1' installed - Please " . + "install it as soon as possible.", 'Archive::Zip')); + return METHOD_NA; + } + + my $zip = Archive::Zip->new(); + + unless( $zip->read( $self->archive ) == &Archive::Zip::AZ_OK ) { + return $self->_error(loc("Unable to read '%1'", $self->archive)); + } + + my @files; + + + ### Address: #43278: Explicitly tell Archive::Zip where to put the files: + ### "In my BackPAN indexing, Archive::Zip was extracting things + ### in my script's directory instead of the current working directory. + ### I traced this back through Archive::Zip::_asLocalName which + ### eventually calls File::Spec::Win32::rel2abs which on Windows might + ### call Cwd::getdcwd. getdcwd returns the wrong directory in my + ### case, even though I think I'm on the same drive. + ### + ### To fix this, I pass the optional second argument to + ### extractMember using the cwd from Archive::Extract." --bdfoy + + ## store cwd() before looping; calls to cwd() can be expensive, and + ### it won't change during the loop + my $extract_dir = cwd(); + + ### have to extract every member individually ### + for my $member ($zip->members) { + push @files, $member->{fileName}; + + ### file to extract to, to avoid the above problem + my $to = File::Spec->catfile( $extract_dir, $member->{fileName} ); + + unless( $zip->extractMember($member, $to) == &Archive::Zip::AZ_OK ) { + return $self->_error(loc("Extraction of '%1' from '%2' failed", + $member->{fileName}, $self->archive )); + } + } + + my $dir = $self->__get_extract_dir( \@files ); + + ### set what files where extract, and where they went ### + $self->files( \@files ); + $self->extract_path( File::Spec->rel2abs($dir) ); + + return 1; +} + +sub __get_extract_dir { + my $self = shift; + my $files = shift || []; + + return unless scalar @$files; + + my($dir1, $dir2); + for my $aref ( [ \$dir1, 0 ], [ \$dir2, -1 ] ) { + my($dir,$pos) = @$aref; + + ### add a catdir(), so that any trailing slashes get + ### take care of (removed) + ### also, a catdir() normalises './dir/foo' to 'dir/foo'; + ### which was the problem in bug #23999 + my $res = -d $files->[$pos] + ? File::Spec->catdir( $files->[$pos], '' ) + : File::Spec->catdir( dirname( $files->[$pos] ) ); + + $$dir = $res; + } + + ### if the first and last dir don't match, make sure the + ### dirname is not set wrongly + my $dir; + + ### dirs are the same, so we know for sure what the extract dir is + if( $dir1 eq $dir2 ) { + $dir = $dir1; + + ### dirs are different.. do they share the base dir? + ### if so, use that, if not, fall back to '.' + } else { + my $base1 = [ File::Spec->splitdir( $dir1 ) ]->[0]; + my $base2 = [ File::Spec->splitdir( $dir2 ) ]->[0]; + + $dir = File::Spec->rel2abs( $base1 eq $base2 ? $base1 : '.' ); + } + + return File::Spec->rel2abs( $dir ); +} + +################################# +# +# Bunzip2 code +# +################################# + +sub _bunzip2_bin { + my $self = shift; + + ### check for /bin/gzip -- we need it ### + unless( $self->bin_bunzip2 ) { + $self->_error(loc("No '%1' program found", '/bin/bunzip2')); + return METHOD_NA; + } + + my $fh = FileHandle->new('>'. $self->_gunzip_to) or + return $self->_error(loc("Could not open '%1' for writing: %2", + $self->_gunzip_to, $! )); + + ### guard against broken bunzip2. See ->have_old_bunzip2() + ### for details + if( $self->have_old_bunzip2 and $self->archive !~ /\.bz2$/i ) { + return $self->_error(loc("Your bunzip2 version is too old and ". + "can only extract files ending in '%1'", + '.bz2')); + } + + my $cmd = [ $self->bin_bunzip2, '-cd', $self->archive ]; + + my $buffer; + unless( scalar run( command => $cmd, + verbose => $DEBUG, + buffer => \$buffer ) + ) { + return $self->_error(loc("Unable to bunzip2 '%1': %2", + $self->archive, $buffer)); + } + + ### no buffers available? + if( !IPC::Cmd->can_capture_buffer and !$buffer ) { + $self->_error( $self->_no_buffer_content( $self->archive ) ); + } + + $self->_print($fh, $buffer) if defined $buffer; + + close $fh; + + ### set what files where extract, and where they went ### + $self->files( [$self->_gunzip_to] ); + $self->extract_path( File::Spec->rel2abs(cwd()) ); + + return 1; +} + +### using cz2, the compact versions... this we use mainly in archive::tar +### extractor.. +# sub _bunzip2_cz1 { +# my $self = shift; +# +# my $use_list = { 'IO::Uncompress::Bunzip2' => '0.0' }; +# unless( can_load( modules => $use_list ) ) { +# return $self->_error(loc("You do not have '%1' installed - Please " . +# "install it as soon as possible.", +# 'IO::Uncompress::Bunzip2')); +# } +# +# my $bz = IO::Uncompress::Bunzip2->new( $self->archive ) or +# return $self->_error(loc("Unable to open '%1': %2", +# $self->archive, +# $IO::Uncompress::Bunzip2::Bunzip2Error)); +# +# my $fh = FileHandle->new('>'. $self->_gunzip_to) or +# return $self->_error(loc("Could not open '%1' for writing: %2", +# $self->_gunzip_to, $! )); +# +# my $buffer; +# $fh->print($buffer) while $bz->read($buffer) > 0; +# $fh->close; +# +# ### set what files where extract, and where they went ### +# $self->files( [$self->_gunzip_to] ); +# $self->extract_path( File::Spec->rel2abs(cwd()) ); +# +# return 1; +# } + +sub _bunzip2_bz2 { + my $self = shift; + + my $use_list = { 'IO::Uncompress::Bunzip2' => '0.0' }; + unless( can_load( modules => $use_list ) ) { + $self->_error(loc("You do not have '%1' installed - Please " . + "install it as soon as possible.", + 'IO::Uncompress::Bunzip2')); + return METHOD_NA; + } + + IO::Uncompress::Bunzip2::bunzip2($self->archive => $self->_gunzip_to) + or return $self->_error(loc("Unable to uncompress '%1': %2", + $self->archive, + $IO::Uncompress::Bunzip2::Bunzip2Error)); + + ### set what files where extract, and where they went ### + $self->files( [$self->_gunzip_to] ); + $self->extract_path( File::Spec->rel2abs(cwd()) ); + + return 1; +} + +################################# +# +# UnXz code +# +################################# + +sub _unxz_bin { + my $self = shift; + + ### check for /bin/unxz -- we need it ### + unless( $self->bin_unxz ) { + $self->_error(loc("No '%1' program found", '/bin/unxz')); + return METHOD_NA; + } + + my $fh = FileHandle->new('>'. $self->_gunzip_to) or + return $self->_error(loc("Could not open '%1' for writing: %2", + $self->_gunzip_to, $! )); + + my $cmd = [ $self->bin_unxz, '-c', '-d', '-f', $self->archive ]; + + my $buffer; + unless( scalar run( command => $cmd, + verbose => $DEBUG, + buffer => \$buffer ) + ) { + return $self->_error(loc("Unable to unxz '%1': %2", + $self->archive, $buffer)); + } + + ### no buffers available? + if( !IPC::Cmd->can_capture_buffer and !$buffer ) { + $self->_error( $self->_no_buffer_content( $self->archive ) ); + } + + $self->_print($fh, $buffer) if defined $buffer; + + close $fh; + + ### set what files where extract, and where they went ### + $self->files( [$self->_gunzip_to] ); + $self->extract_path( File::Spec->rel2abs(cwd()) ); + + return 1; +} + +sub _unxz_cz { + my $self = shift; + + my $use_list = { 'IO::Uncompress::UnXz' => '0.0' }; + unless( can_load( modules => $use_list ) ) { + $self->_error(loc("You do not have '%1' installed - Please " . + "install it as soon as possible.", + 'IO::Uncompress::UnXz')); + return METHOD_NA; + } + + IO::Uncompress::UnXz::unxz($self->archive => $self->_gunzip_to) + or return $self->_error(loc("Unable to uncompress '%1': %2", + $self->archive, + $IO::Uncompress::UnXz::UnXzError)); + + ### set what files where extract, and where they went ### + $self->files( [$self->_gunzip_to] ); + $self->extract_path( File::Spec->rel2abs(cwd()) ); + + return 1; +} + + +################################# +# +# unlzma code +# +################################# + +sub _unlzma_bin { + my $self = shift; + + ### check for /bin/unlzma -- we need it ### + unless( $self->bin_unlzma ) { + $self->_error(loc("No '%1' program found", '/bin/unlzma')); + return METHOD_NA; + } + + my $fh = FileHandle->new('>'. $self->_gunzip_to) or + return $self->_error(loc("Could not open '%1' for writing: %2", + $self->_gunzip_to, $! )); + + my $cmd = [ $self->bin_unlzma, '-c', $self->archive ]; + + my $buffer; + unless( scalar run( command => $cmd, + verbose => $DEBUG, + buffer => \$buffer ) + ) { + return $self->_error(loc("Unable to unlzma '%1': %2", + $self->archive, $buffer)); + } + + ### no buffers available? + if( !IPC::Cmd->can_capture_buffer and !$buffer ) { + $self->_error( $self->_no_buffer_content( $self->archive ) ); + } + + $self->_print($fh, $buffer) if defined $buffer; + + close $fh; + + ### set what files where extract, and where they went ### + $self->files( [$self->_gunzip_to] ); + $self->extract_path( File::Spec->rel2abs(cwd()) ); + + return 1; +} + +sub _unlzma_cz { + my $self = shift; + + my $use_list1 = { 'IO::Uncompress::UnLzma' => '0.0' }; + my $use_list2 = { 'Compress::unLZMA' => '0.0' }; + + if (can_load( modules => $use_list1 ) ) { + IO::Uncompress::UnLzma::unlzma($self->archive => $self->_gunzip_to) + or return $self->_error(loc("Unable to uncompress '%1': %2", + $self->archive, + $IO::Uncompress::UnLzma::UnLzmaError)); + } + elsif (can_load( modules => $use_list2 ) ) { + + my $fh = FileHandle->new('>'. $self->_gunzip_to) or + return $self->_error(loc("Could not open '%1' for writing: %2", + $self->_gunzip_to, $! )); + + my $buffer; + $buffer = Compress::unLZMA::uncompressfile( $self->archive ); + unless ( defined $buffer ) { + return $self->_error(loc("Could not unlzma '%1': %2", + $self->archive, $@)); + } + + $self->_print($fh, $buffer) if defined $buffer; + + close $fh; + } + else { + $self->_error(loc("You do not have '%1' or '%2' installed - Please " . + "install it as soon as possible.", 'Compress::unLZMA', 'IO::Uncompress::UnLzma')); + return METHOD_NA; + } + + ### set what files where extract, and where they went ### + $self->files( [$self->_gunzip_to] ); + $self->extract_path( File::Spec->rel2abs(cwd()) ); + + return 1; +} + +################################# +# +# Error code +# +################################# + +# For printing binaries that avoids interfering globals +sub _print { + my $self = shift; + my $fh = shift; + + local( $\, $", $, ) = ( undef, ' ', '' ); + return print $fh @_; +} + +sub _error { + my $self = shift; + my $error = shift; + my $lerror = Carp::longmess($error); + + push @{$self->_error_msg}, $error; + push @{$self->_error_msg_long}, $lerror; + + ### set $Archive::Extract::WARN to 0 to disable printing + ### of errors + if( $WARN ) { + carp $DEBUG ? $lerror : $error; + } + + return; +} + +sub error { + my $self = shift; + + ### make sure we have a fallback aref + my $aref = do { + shift() + ? $self->_error_msg_long + : $self->_error_msg + } || []; + + return join $/, @$aref; +} + +=head2 debug( MESSAGE ) + +This method outputs MESSAGE to the default filehandle if C<$DEBUG> is +true. It's a small method, but it's here if you'd like to subclass it +so you can so something else with any debugging output. + +=cut + +### this is really a stub for subclassing +sub debug { + return unless $DEBUG; + + print $_[1]; +} + +sub _no_buffer_files { + my $self = shift; + my $file = shift or return; + return loc("No buffer captured, unable to tell ". + "extracted files or extraction dir for '%1'", $file); +} + +sub _no_buffer_content { + my $self = shift; + my $file = shift or return; + return loc("No buffer captured, unable to get content for '%1'", $file); +} +1; + +=pod + +=head1 HOW IT WORKS + +C<Archive::Extract> tries first to determine what type of archive you +are passing it, by inspecting its suffix. It does not do this by using +Mime magic, or something related. See C<CAVEATS> below. + +Once it has determined the file type, it knows which extraction methods +it can use on the archive. It will try a perl solution first, then fall +back to a commandline tool if that fails. If that also fails, it will +return false, indicating it was unable to extract the archive. +See the section on C<GLOBAL VARIABLES> to see how to alter this order. + +=head1 CAVEATS + +=head2 File Extensions + +C<Archive::Extract> trusts on the extension of the archive to determine +what type it is, and what extractor methods therefore can be used. If +your archives do not have any of the extensions as described in the +C<new()> method, you will have to specify the type explicitly, or +C<Archive::Extract> will not be able to extract the archive for you. + +=head2 Supporting Very Large Files + +C<Archive::Extract> can use either pure perl modules or command line +programs under the hood. Some of the pure perl modules (like +C<Archive::Tar> and Compress::unLZMA) take the entire contents of the archive into memory, +which may not be feasible on your system. Consider setting the global +variable C<$Archive::Extract::PREFER_BIN> to C<1>, which will prefer +the use of command line programs and won't consume so much memory. + +See the C<GLOBAL VARIABLES> section below for details. + +=head2 Bunzip2 support of arbitrary extensions. + +Older versions of C</bin/bunzip2> do not support arbitrary file +extensions and insist on a C<.bz2> suffix. Although we do our best +to guard against this, if you experience a bunzip2 error, it may +be related to this. For details, please see the C<have_old_bunzip2> +method. + +=head1 GLOBAL VARIABLES + +=head2 $Archive::Extract::DEBUG + +Set this variable to C<true> to have all calls to command line tools +be printed out, including all their output. +This also enables C<Carp::longmess> errors, instead of the regular +C<carp> errors. + +Good for tracking down why things don't work with your particular +setup. + +Defaults to C<false>. + +=head2 $Archive::Extract::WARN + +This variable controls whether errors encountered internally by +C<Archive::Extract> should be C<carp>'d or not. + +Set to false to silence warnings. Inspect the output of the C<error()> +method manually to see what went wrong. + +Defaults to C<true>. + +=head2 $Archive::Extract::PREFER_BIN + +This variables controls whether C<Archive::Extract> should prefer the +use of perl modules, or commandline tools to extract archives. + +Set to C<true> to have C<Archive::Extract> prefer commandline tools. + +Defaults to C<false>. + +=head1 TODO / CAVEATS + +=over 4 + +=item Mime magic support + +Maybe this module should use something like C<File::Type> to determine +the type, rather than blindly trust the suffix. + +=item Thread safety + +Currently, C<Archive::Extract> does a C<chdir> to the extraction dir before +extraction, and a C<chdir> back again after. This is not necessarily +thread safe. See C<rt.cpan.org> bug C<#45671> for details. + +=back + +=head1 BUG REPORTS + +Please report bugs or other issues to E<lt>bug-archive-extract@rt.cpan.orgE<gt>. + +=head1 AUTHOR + +This module by Jos Boumans E<lt>kane@cpan.orgE<gt>. + +=head1 COPYRIGHT + +This library is free software; you may redistribute and/or modify it +under the same terms as Perl itself. + +=cut + +# Local variables: +# c-indentation-style: bsd +# c-basic-offset: 4 +# indent-tabs-mode: nil +# End: +# vim: expandtab shiftwidth=4: + |