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#!/usr/bin/perl -w |
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use strict; |
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|
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use blib; |
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use Fuse; |
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use IO::File; |
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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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my $can_syscall = eval { |
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require 'syscall.ph'; # for SYS_mknod and SYS_lchown |
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}; |
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if (!$can_syscall && open my $fh, '<', '/usr/include/sys/syscall.h') { |
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local $/ = undef; |
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my %sys = do { local $/ = undef; |
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<$fh> =~ m/\#define \s+ (\w+) \s+ (\d+)/gxms; |
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}; |
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close $fh; |
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if ($sys{SYS_mknod} && $sys{SYS_lchown}) { |
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*SYS_mknod = sub { $sys{SYS_mknod} }; |
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*SYS_lchown = sub { $sys{SYS_lchown} }; |
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$can_syscall = 1; |
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} |
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} |
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|
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my $tmp = -d '/private' ? '/private/tmp' : '/tmp'; |
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my $tmp_path = "$tmp/fusetest-" . $ENV{LOGNAME}; |
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if (! -e $tmp_path) { |
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mkdir($tmp_path) || die "can't create $tmp_path: $!"; |
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} |
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|
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sub fixup { print STDERR "fixup $_[0] from @{[caller]}\n"; |
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my ($path) = @_; |
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return $tmp_path if $path eq '/'; |
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return $tmp_path . $path; |
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} |
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|
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sub x_getattr { |
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my ($file) = fixup(shift); |
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my (@list) = lstat($file); |
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return -$! 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) = 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 x_open { |
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my ($file) = fixup(shift); |
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my ($mode) = shift; |
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return -$! unless sysopen(FILE,$file,$mode); |
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close(FILE); |
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return 0; |
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} |
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|
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sub x_read { |
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my ($file,$bufsize,$off) = @_; |
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my ($rv) = -ENOSYS(); |
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my ($handle) = new IO::File; |
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return -ENOENT() unless -e ($file = fixup($file)); |
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my ($fsize) = -s $file; |
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return -ENOSYS() unless open($handle,$file); |
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if(seek($handle,$off,SEEK_SET)) { |
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read($handle,$rv,$bufsize); |
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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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my ($rv); |
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return -ENOENT() unless -e ($file = fixup($file)); |
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my ($fsize) = -s $file; |
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return -ENOSYS() unless open(FILE,'+<',$file); |
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if($rv = seek(FILE,$off,SEEK_SET)) { |
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$rv = print(FILE $buf); |
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} |
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$rv = -ENOSYS() unless $rv; |
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close(FILE); |
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return length($buf); |
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} |
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|
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sub err { return (-shift || -$!) } |
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|
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sub x_readlink { return readlink(fixup(shift)); } |
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sub x_unlink { return unlink(fixup(shift)) ? 0 : -$!; } |
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|
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sub x_symlink { print "symlink\n"; return symlink(shift,fixup(shift)) ? 0 : -$!; } |
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|
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sub x_rename { |
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my ($old) = fixup(shift); |
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my ($new) = fixup(shift); |
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my ($err) = rename($old,$new) ? 0 : -ENOENT(); |
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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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sub x_chown { |
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return -ENOSYS() if ! $can_syscall; |
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my ($fn) = fixup(shift); |
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print "nonexistent $fn\n" unless -e $fn; |
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my ($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,$fn,$uid,$gid,$fn) ? -$! : 0; |
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return $err; |
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} |
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sub x_chmod { |
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my ($fn) = fixup(shift); |
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my ($mode) = shift; |
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my ($err) = chmod($mode,$fn) ? 0 : -$!; |
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return $err; |
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} |
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sub x_truncate { return truncate(fixup(shift),shift) ? 0 : -$! ; } |
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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),$perm); return -$!; } |
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sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; } |
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|
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sub x_mknod { |
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return -ENOSYS() if ! $can_syscall; |
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# since this is called for ALL files, not just devices, I'll do some checks |
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# and possibly run the real mknod command. |
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my ($file, $modes, $dev) = @_; |
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$file = fixup($file); |
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$! = 0; |
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syscall(&SYS_mknod,$file,$modes,$dev); |
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return -$!; |
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} |
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|
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# kludge |
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sub x_statfs {return 255,1000000,500000,1000000,500000,4096} |
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my ($mountpoint) = ""; |
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$mountpoint = shift(@ARGV) if @ARGV; |
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Fuse::main( |
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mountpoint=>$mountpoint, |
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getattr =>"main::x_getattr", |
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readlink=>"main::x_readlink", |
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getdir =>"main::x_getdir", |
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mknod =>"main::x_mknod", |
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mkdir =>"main::x_mkdir", |
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unlink =>"main::x_unlink", |
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rmdir =>"main::x_rmdir", |
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symlink =>"main::x_symlink", |
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rename =>"main::x_rename", |
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link =>"main::x_link", |
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chmod =>"main::x_chmod", |
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chown =>"main::x_chown", |
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truncate=>"main::x_truncate", |
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utime =>"main::x_utime", |
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open =>"main::x_open", |
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read =>"main::x_read", |
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write =>"main::x_write", |
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statfs =>"main::x_statfs", |
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threaded=>0, |
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debug => 1, |
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); |
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