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#!/usr/bin/perl -w |
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use strict; |
3 |
use threads; |
4 |
use threads::shared; |
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|
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use Fuse; |
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use POSIX qw(ENOENT ENOSYS EEXIST EPERM O_RDONLY O_RDWR O_APPEND O_CREAT); |
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use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET); |
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require 'syscall.ph'; # for SYS_mknod and SYS_lchown |
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use PerlIO::gzip; |
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use File::Path; |
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use Data::Dump qw/dump/; |
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use Carp qw/confess/; |
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use IO::File; |
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use Getopt::Long; |
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|
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my $debug = 0; |
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my $fuse_debug = 0; |
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|
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GetOptions( |
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'debug+' => \$debug, |
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'fuse-debug+' => \$fuse_debug, |
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); |
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|
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my $mount = { |
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from => '/tmp/comp', |
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to => '/tmp/no-comp', |
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tmp => '/dev/shm/comp', |
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}; |
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|
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my $debug = shift @ARGV; |
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|
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my $skip_extensions_regex = qr/\.(?:sw[a-z]|gif|png|jpeg|jpg|avi|rar|zip|bz2|gz|tgz|avi|mpeg|mpg|tmp|temp)$/i; |
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|
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# don't compress files smaller than this |
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my $min_compress_size = 512; |
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|
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foreach my $dir ( keys %$mount ) { |
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if ( ! -e $mount->{$dir} ) { |
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warn "created $mount->{$dir}\n"; |
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mkdir $mount->{$dir} || die "can't create $mount->{$dir}: $!"; |
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} |
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} |
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|
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my $pending; |
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|
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sub fixup { |
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my ( $path ) = @_; |
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my $full = $mount->{from} . '/' . $path; |
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if ( -e $full . '.gz' ) { |
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return $full . '.gz'; |
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} |
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return $full; |
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} |
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|
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sub original_name { |
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my $p = shift; |
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$p =~ s/\.gz$//; |
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return $p; |
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}; |
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|
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sub gzip_original_size { |
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my $file = shift; |
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|
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return unless -e $file; |
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|
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my $buff; |
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|
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open(my $fh, $file) || die "can't open $file: $!"; |
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|
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# read($fh, $buff, 10 ); |
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# print dump( unpack("nccVcc", $buff ) ); |
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|
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seek($fh, -4, 2); |
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read($fh, $buff, 4 ); |
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close($fh); |
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|
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return unpack("L", $buff); |
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} |
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|
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sub unlink_all { |
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my $file = shift; |
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warn "# unlink_all( $file )\n"; |
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|
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my $path = fixup( $file ); |
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unlink $path || return 0; |
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|
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my $tmp = $mount->{tmp} . '/' . $file; |
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unlink $tmp if ( -e $tmp ); |
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|
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delete( $pending->{$file} ); |
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return 1; |
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} |
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|
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sub x_getattr { |
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my ($file) = fixup(shift); |
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my (@list) = lstat($file); |
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$list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ ); |
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return -$! unless @list; |
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return @list; |
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} |
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|
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sub x_getdir { |
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my ($dirname) = fixup(shift); |
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unless(opendir(DIRHANDLE,$dirname)) { |
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return -ENOENT(); |
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} |
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my @files = map { original_name( $_ ) } readdir(DIRHANDLE); |
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closedir(DIRHANDLE); |
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return (@files, 0); |
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} |
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|
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sub file_copy { |
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my ( $s_opt, $s_path, $d_opt, $d_path ) = @_; |
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warn "## file_copy( $s_opt $s_path [",-s $s_path,"] $d_opt $d_path [",-e $d_path ? -s $d_path : 'new',"])\n" if $debug; |
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open(my $s, $s_opt, $s_path ) || confess "can't open $s_path: $!\npending = ", dump( $pending ); |
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open(my $d, $d_opt, $d_path ) || confess "can't open $d_path: $!"; |
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my $buff; |
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while( read( $s, $buff, 65535 ) ) { |
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print $d $buff || confess "can't write into $d_path: $!"; |
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warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug; |
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} |
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close($d) || warn "can't close $d_path: $!"; |
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close($s) || warn "can't close $s_path: $!"; |
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warn "-- $s_path [", -s $s_path, "] >>> $d_path [", -s $d_path, "]\n" if $debug; |
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my ($mode,$uid,$gid,$atime,$mtime) = (stat $s_path)[2,4,5,8,9]; |
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|
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chmod $mode, $d_path || warn "chmod( $mode $d_path ) failed: $!\n"; |
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chown $uid,$gid,$d_path || warn "chown( $uid $gid $d_path ) failed: $!\n"; |
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utime $atime,$mtime,$d_path || warn "utime( $atime $mtime $d_path ) failed: $!\n"; |
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|
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undef $d; |
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undef $s; |
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} |
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|
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sub x_open { |
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my ($file) = shift; |
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my ($mode) = shift; |
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|
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if ( $file eq '/.debug' ) { |
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my $path = $mount->{from} . '/.debug'; |
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open( my $debug, '>', $path ) || die "can't open $path: $!"; |
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my $dump = dump( $pending ); |
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print $debug "pending = $dump\n"; |
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close($debug); |
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$pending->{'/.debug'}->{path} = $path; |
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warn "## created dump $path $dump\n"; |
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return 0; |
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} |
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|
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$pending->{$file}->{open}++; |
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|
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my $mode_desc = { |
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rdonly => $mode && O_RDONLY, |
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rdwr => $mode && O_RDWR, |
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append => $mode && O_APPEND, |
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create => $mode && O_CREAT, |
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trunc => $mode && O_TRUNC, |
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}; |
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my $path = fixup($file); |
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warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug; |
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my $fh; |
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|
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my $tmp = $mount->{tmp} . '/' . $file; |
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if ( -e $tmp ) { |
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$path = $tmp; |
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} elsif ( $path =~ m/\.gz$/ ) { |
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my $dest_path = $tmp; |
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$dest_path =~ s!/[^/]+$!!; #!vim-fix |
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mkpath $dest_path unless -e $dest_path; |
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if ( -s $path ) { |
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file_copy( '<:gzip', $path, '>', $tmp ) |
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} else { |
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warn "ERROR: filesystem corruption, $path is zero size\n"; |
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} |
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$path = $tmp; |
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} |
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|
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if ( sysopen($fh , $path, $mode) ) { |
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close($fh) || confess "can't close $path: $!"; |
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warn "<<< open $path [", -e $path ? -s $path : 'new' , "]\n"; |
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$pending->{$file}->{path} = $path; |
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return 0; |
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} else { |
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warn "ERROR: can't open $path : $!"; |
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return -$!; |
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} |
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|
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} |
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|
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sub x_read { |
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my ($file,$bufsize,$off) = @_; |
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my ($rv) = -ENOSYS(); |
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my $path = fixup( $file ); |
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|
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confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} ); |
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|
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return -ENOENT() unless -e $path; |
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|
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my $fh = new IO::File; |
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return -ENOSYS() unless open($fh,$pending->{$file}->{path}); |
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|
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if(seek($fh,$off,SEEK_SET)) { |
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read($fh,$rv,$bufsize); |
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} |
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|
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return $rv; |
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} |
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|
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sub x_write { |
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my ($file,$buf,$off) = @_; |
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$pending->{$file}->{write}++; |
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my $rv; |
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my $path = fixup($file); |
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|
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confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} ); |
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|
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return -ENOENT() unless -e $path; |
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|
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my $fh = new IO::File; |
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return -ENOSYS() unless open($fh,'+<',$pending->{$file}->{path}); |
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if($rv = seek( $fh ,$off,SEEK_SET)) { |
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$rv = print( $fh $buf ); |
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warn "## write ", $pending->{$file}->{path}, " $off ",length( $buf ), "\n" if $debug; |
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} |
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$rv = -ENOSYS() unless $rv; |
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close($fh); |
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return length($buf); |
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} |
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|
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sub err { return (-shift || -$!) } |
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|
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sub x_readlink { return readlink(fixup(shift)); } |
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sub x_unlink { return unlink_all( shift ) ? 0 : -$! } |
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|
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sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; } |
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|
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sub x_rename { |
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my ($old,$new) = @_; |
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my $old_path = fixup($old); |
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my $new_path = fixup($new); |
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$new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ ); |
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|
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my $err = rename($old_path,$new_path) ? 0 : -ENOENT(); |
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warn "## rename( $old_path => $new_path ) = $err\n"; |
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|
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my $tmp = $mount->{tmp} . '/' . $old; |
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if ( -e $tmp ) { |
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my $new_tmp = $mount->{tmp} . '/' . $new; |
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rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!"; |
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} |
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|
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if (defined( $pending->{$old} )) { |
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$pending->{$new} = $pending->{$old}; |
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|
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my $path = $pending->{$old}->{path}; |
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$path =~ s/\Q$old\E/$new/; |
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$pending->{$new}->{path} = $path; |
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$pending->{$old}->{path} = $path; |
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|
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#delete( $pending->{$old} ); |
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} |
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|
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return $err; |
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} |
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sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! } |
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|
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sub x_chown { |
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my ($path) = fixup(shift); |
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print "nonexistent $path\n" unless -e $path; |
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my ($uid,$gid) = @_; |
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# perl's chown() does not chown symlinks, it chowns the symlink's |
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# target. it fails when the link's target doesn't exist, because |
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# the stat64() syscall fails. |
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# this causes error messages when unpacking symlinks in tarballs. |
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my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0; |
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return $err; |
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} |
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|
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sub x_chmod { |
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my ($path) = fixup(shift); |
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my ($mode) = shift; |
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my ($err) = chmod($mode,$path) ? 0 : -$!; |
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return $err; |
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} |
286 |
|
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sub x_truncate { |
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my ( $file,$size ) = @_; |
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my $path = fixup($file); |
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my $rv = truncate( $path, $size ) ? 0 : -$! ; |
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if ( $path =~ m/\.gz$/ ) { |
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my $no_gz = $path; |
293 |
$no_gz =~ s/\.gz$//; |
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rename $path, $no_gz || confess "can't rename $path -> $no_gz: $!"; |
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} |
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warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug; |
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$pending->{$file}->{write}++; |
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return $rv; |
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} |
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sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; } |
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|
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sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; } |
303 |
sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; } |
304 |
|
305 |
sub x_mknod { |
306 |
# since this is called for ALL files, not just devices, I'll do some checks |
307 |
# and possibly run the real mknod command. |
308 |
my ($file, $modes, $dev) = @_; |
309 |
$file = fixup($file); |
310 |
$! = 0; |
311 |
syscall(&SYS_mknod,$file,$modes,$dev); |
312 |
return -$!; |
313 |
} |
314 |
|
315 |
sub x_release { |
316 |
my ( $file, $mode ) = @_; |
317 |
if ( ! defined( $pending->{$file} ) ) { |
318 |
warn "release $file, NO PENDING DATA\n"; |
319 |
return 0; |
320 |
} elsif ( ! defined( $pending->{$file}->{write} ) ) { |
321 |
warn "release $file, not written into\n"; |
322 |
} elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) { |
323 |
my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending ); |
324 |
my $dest = fixup( $file ); |
325 |
|
326 |
# cleanup old compressed copy |
327 |
if ( $dest =~ /\.gz$/ ) { |
328 |
warn "## remove old $dest\n"; |
329 |
unlink $dest || confess "can't remove $dest: $!"; |
330 |
$dest =~ s/\.gz$//; |
331 |
} |
332 |
|
333 |
if ( $file =~ $skip_extensions_regex ) { |
334 |
warn "release $file [",-s $path,"] skipped compression\n"; |
335 |
file_copy( '<', $path, '>', $dest ) if ( $path ne $dest ); |
336 |
} elsif ( -s $path < $min_compress_size ) { |
337 |
warn "release $file [",-s $path,"] uncompressed, too small\n"; |
338 |
file_copy( '<', $path, '>', $dest ) if ( $path ne $dest ); |
339 |
} else { |
340 |
warn "release $file [",-s $path,"] compressing\n"; |
341 |
|
342 |
my $comp = $dest . '.gz'; |
343 |
file_copy( '<', $path, '>:gzip', $comp ); |
344 |
|
345 |
my ( $size_path, $size_comp ) = ( -s $path, -s $comp ); |
346 |
|
347 |
if ( $size_path <= $size_comp ) { |
348 |
warn ">>> $size_path <= $size_comp leaving uncompressed\n"; |
349 |
unlink $comp || warn "can't reamove: $comp: $!"; |
350 |
} else { |
351 |
warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"%\n"; |
352 |
# FIXME add timeout to remove uncompressed version? |
353 |
unlink $path || warn "can't remove $path: $!"; |
354 |
} |
355 |
} |
356 |
} else { |
357 |
warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n"; |
358 |
} |
359 |
$pending->{$file}->{open}--; |
360 |
if ( $pending->{$file}->{open} == 0 ) { |
361 |
warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug; |
362 |
delete( $pending->{$file} ); |
363 |
} |
364 |
return 0; |
365 |
} |
366 |
|
367 |
# kludge |
368 |
sub x_statfs {return 255,1000000,500000,1000000,500000,4096} |
369 |
Fuse::main( |
370 |
mountpoint=>$mount->{to}, |
371 |
getattr =>"main::x_getattr", |
372 |
readlink=>"main::x_readlink", |
373 |
getdir =>"main::x_getdir", |
374 |
mknod =>"main::x_mknod", |
375 |
mkdir =>"main::x_mkdir", |
376 |
unlink =>"main::x_unlink", |
377 |
rmdir =>"main::x_rmdir", |
378 |
symlink =>"main::x_symlink", |
379 |
rename =>"main::x_rename", |
380 |
link =>"main::x_link", |
381 |
chmod =>"main::x_chmod", |
382 |
chown =>"main::x_chown", |
383 |
truncate=>"main::x_truncate", |
384 |
utime =>"main::x_utime", |
385 |
open =>"main::x_open", |
386 |
read =>"main::x_read", |
387 |
write =>"main::x_write", |
388 |
statfs =>"main::x_statfs", |
389 |
release =>"main::x_release", |
390 |
# threaded=>1, |
391 |
debug => $fuse_debug, |
392 |
); |