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|
#!/usr/bin/perl
use Fuse;
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
},
);
sub filename_fixup {
my ($file) = shift;
$file =~ s,^/,,;
$file = '.' unless length($file);
return $file;
}
sub e_getattr {
my ($file) = filename_fixup(shift);
$file =~ s,^/,,;
$file = '.' unless length($file);
return -ENOENT() unless exists($files{$file});
my ($size) = exists($files{$file}{cont}) ? length($files{$file}{cont}) : 0;
my ($modes) = ($files{$file}{type}<<9) + $files{$file}{mode};
my ($blocks, $gid, $uid, $nlink) = (1,0,0,1);
# 4 possible return values:
#return -ENOENT(); # or any other error you care to
return ($blocks,$size,$gid,$uid,$nlink,$modes,$files{$file}{ctime});
# return ($errno,$blocks,$size,$gid,$uid,$nlink,$modes,$time);
# return ($errno,$blksize,$blocks,$size,$gid,$uid,$nlink,$modes,$time);
# if omitted, errno defaults to 0, and blksize defaults to 1024.
}
sub e_getdir {
# return as many text filenames as you like, followed by the retval.
return (keys %files),0;
}
sub e_open {
# VFS sanity check; it keeps all the necessary state, not much to do here.
my ($file) = filename_fixup(shift);
return -ENOENT() unless exists($files{$file});
return -EISDIR() unless exists($files{$file}{cont});
return 0;
}
sub e_read {
# return an error numeric, or binary/text string. (note: 0 means EOF, "0" will
# give a byte (ascii "0") to the reading program)
my ($file) = filename_fixup(shift);
my ($buf,$off) = @_;
return -ENOENT() unless exists($files{$file});
return -EINVAL() if $off > length($files{$file}{cont});
return 0 if $off == length($files{$file}{cont});
return substr($files{$file}{cont},$off,$buf);
}
# If you run the script directly, it will run fusermount, which will in turn
# re-run this script. Hence the funky semantics.
my ($mountpoint) = "";
$mountpoint = shift(@ARGV) if @ARGV;
Fuse::main(
mountpoint=>$mountpoint,
getattr=>\&e_getattr,
getdir=>\&e_getdir,
open=>\&e_open,
read=>\&e_read,
);
|
