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executable file 109 lines (99 sloc) 2.981 kb
#!/usr/bin/perl -w
use strict;
#use blib;
use Fuse qw(fuse_get_context);
use POSIX qw(ENOENT EISDIR EINVAL);
my (%files) = (
'.' => {
type => 0040,
mode => 0755,
ctime => time()-1000
},
a => {
cont => "File 'a'.\n",
type => 0100,
mode => 0755,
ctime => time()-2000
},
b => {
cont => "This is file 'b'.\n",
type => 0100,
mode => 0644,
ctime => time()-1000
},
me => {
size => 45,
type => 0100,
mode => 0644,
ctime => time()-1000
},
);
sub filename_fixup {
my ($file) = shift;
$file =~ s,^/,,;
$file = '.' unless length($file);
return $file;
}
sub e_getattr {
my ($file) = filename_fixup(shift);
return -ENOENT() unless exists($files{$file});
my ($size) = exists($files{$file}{cont}) ? length($files{$file}{cont}) : 0;
$size = $files{$file}{size} if exists $files{$file}{size};
my ($modes) = ($files{$file}{type}<<9) + $files{$file}{mode};
my ($dev, $ino, $rdev, $blocks, $gid, $uid, $nlink, $blksize) = (0,0,0,1,0,0,1,1024);
my ($atime, $ctime, $mtime);
$atime = $ctime = $mtime = $files{$file}{ctime};
# 2 possible types of return values:
#return -ENOENT(); # or any other error you care to
#print(join(",",($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks)),"\n");
return ($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks);
}
sub e_readdir {
my ($path,$offset) = @_;
print "readdir $path $offset\n";
my $stridelen = 9;
my $last = $offset + $stridelen;
my @a = keys %files;
if ($last > $#a) { $last = $#a; }
my @ents = map { [ $_, $a[$_] ] } $offset .. $last;
return @ents, $offset < $#a ? 0 : -ENOENT();
}
sub e_open {
# VFS sanity check; it keeps all the necessary state, not much to do here.
my ($file) = filename_fixup(shift);
print("open called\n");
return -ENOENT() unless exists($files{$file});
return -EISDIR() if $files{$file}{type} & 0040;
print("open ok\n");
return 0;
}
sub e_read {
# return an error numeric, or binary/text string. (note: 0 means EOF, "0" will
# give a byte (ascii "0") to the reading program)
my ($file) = filename_fixup(shift);
my ($buf,$off) = @_;
return -ENOENT() unless exists($files{$file});
if(!exists($files{$file}{cont})) {
return -EINVAL() if $off > 0;
my $context = fuse_get_context();
return sprintf("pid=0x%08x uid=0x%08x gid=0x%08x\n",@$context{'pid','uid','gid'});
}
return -EINVAL() if $off > length($files{$file}{cont});
return 0 if $off == length($files{$file}{cont});
return substr($files{$file}{cont},$off,$buf);
}
sub e_statfs { return 255, 1, 1, 1, 1, 2 }
# If you run the script directly, it will run fusermount, which will in turn
# re-run this script. Hence the funky semantics.
my ($mountpoint) = "";
$mountpoint = shift(@ARGV) if @ARGV;
Fuse::main(
mountpoint=>$mountpoint,
getattr=>"main::e_getattr",
# getdir =>"main::e_getdir",
readdir=>"main::e_readdir",
open =>"main::e_open",
statfs =>"main::e_statfs",
read =>"main::e_read",
threaded=>0
);
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