examples/rmount.pl

   1 #!/usr/bin/perl -w
   2
   3 # This example needs some work before it can support threads.
   4 use strict;
   5 use Net::SSH 'sshopen2';
   6 use IPC::Open2;
   7 use Fuse;
   8 use Data::Dumper;
   9
  10 my ($host, $dir, $mount) = @ARGV;
  11 if(!defined($mount)) {
  12         $mount = $dir;
  13         if($host =~ /^(.*):(.*)$/) {
  14                 ($host,$dir) = ($1,$2);
  15         } else {
  16                 die "usage: $0 user\@host remotedir mountpoint\n".
  17                     "or   : $0 user\@host:remotedir mountpoint\n";
  18         }
  19 }
  20
  21 `umount $mount` unless -d $mount;
  22 die "mountpoint $mount isn't a directory!\n" unless -d $mount;
  23
  24 my (%args) = (mountpoint => $mount);
  25
  26 map { my ($str) = $_; $args{$str} = sub { netlink($str,@_) } }
  27         qw(getattr getdir open read write readlink unlink rmdir
  28            symlink rename link chown chmod truncate utime mkdir
  29            rmdir mknod statfs);
  30
  31 sub connect_remote {
  32         sshopen2($host, *READER, *WRITER, "./rmount_remote.pl $dir")
  33                 or die "ssh: $!\n";
  34         select WRITER;
  35         $| = 1;
  36         select STDOUT;
  37 }
  38
  39 $SIG{CHLD} = sub {
  40         use POSIX ":sys_wait_h";
  41         my $kid;
  42         do {
  43                 $kid = waitpid(-1,WNOHANG);
  44         } until $kid < 1;
  45 };
  46
  47 connect_remote;
  48
  49 sub netlink {
  50         my ($str) = Dumper(\@_)."\n";
  51         $str = sprintf("%08i\n%s",length($str),$str);
  52         while(1) { # retry as necessary
  53                 my ($VAR1);
  54                 $VAR1 = undef;
  55                 eval {
  56                         local $SIG{ALRM} = sub { die "timeout\n" };
  57                         alarm 10;
  58                         print WRITER $str;
  59                         my ($len, $data);
  60                         $data = '';
  61                         if(sysread(READER,$len,9) == 9) {
  62                                 sysread(READER,$data,$len-length($data),length($data))
  63                                         while(length($data) < $len);
  64                                 eval $data;
  65                         }
  66                         alarm 0;
  67                 };
  68                 if(defined $VAR1) {
  69                         return wantarray ? @{$VAR1} : $$VAR1[0];
  70                 }
  71                 print STDERR "failed to send command; reconnecting ssh\n";
  72                 close(READER);
  73                 close(WRITER);
  74                 connect_remote();
  75         }
  76 }
  77
  78 Fuse::main(%args);
  79
  80 netlink("bye");
  81 close(READER);
  82 close(WRITER);