/[fuse.before_github]/perl/trunk/examples/rmount_remote.pl
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Annotation of /perl/trunk/examples/rmount_remote.pl

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Revision 98 - (hide annotations)
Tue Jan 3 16:45:51 2006 UTC (17 years, 1 month ago) by dpavlin
File MIME type: text/plain
File size: 3659 byte(s)
subversion revision 71 commited to CVS

1 mszeredi 4 #!/usr/bin/perl
2    
3     use strict;
4     use IO::File;
5     use POSIX qw(ENOENT ENOSYS EEXIST EPERM O_RDONLY O_RDWR O_APPEND O_CREAT);
6     use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET);
7     use Data::Dumper;
8     require 'syscall.ph'; # for SYS_mknod and SYS_lchown
9    
10     my ($rootdir) = @ARGV;
11    
12     # strip leading and trailing slashes
13     $rootdir = $1 if($rootdir =~ /^\/?(.*)\/?$/);
14    
15     sub fixup { return "/$rootdir" . shift }
16    
17     sub x_getattr {
18     my ($file) = fixup(shift);
19     my (@list) = lstat($file);
20     return -$! unless @list;
21     return @list;
22     }
23    
24     sub x_getdir {
25     my ($dirname) = fixup(shift);
26     unless(opendir(DIRHANDLE,$dirname)) {
27     return -ENOENT();
28     }
29     my (@files) = readdir(DIRHANDLE);
30     closedir(DIRHANDLE);
31     return (@files, 0);
32     }
33    
34     sub x_open {
35     my ($file) = fixup(shift);
36     my ($mode) = shift;
37     return -$! unless sysopen(FILE,$file,$mode);
38     close(FILE);
39     return 0;
40     }
41    
42     sub x_read {
43     my ($file,$bufsize,$off) = @_;
44     my ($rv) = -ENOSYS();
45     my ($handle) = new IO::File;
46     return -ENOENT() unless -e ($file = fixup($file));
47     my ($fsize) = -s $file;
48     return -ENOSYS() unless open($handle,$file);
49     if(seek($handle,$off,SEEK_SET)) {
50     read($handle,$rv,$bufsize);
51     }
52     return $rv;
53     }
54    
55     sub x_write {
56     my ($file,$buf,$off) = @_;
57     my ($rv);
58     return -ENOENT() unless -e ($file = fixup($file));
59     my ($fsize) = -s $file;
60     return -ENOSYS() unless open(FILE,'+<',$file);
61     if($rv = seek(FILE,$off,SEEK_SET)) {
62     $rv = print(FILE $buf);
63     }
64     $rv = -ENOSYS() unless $rv;
65     close(FILE);
66     return length($buf);
67     }
68    
69     sub err { return (-shift || -$!) }
70    
71     sub x_readlink { return readlink(fixup(shift) ); }
72     sub x_unlink { return unlink(fixup(shift)) ? 0 : -$!; }
73     sub x_rmdir { return err(rmdir(fixup(shift)) ); }
74    
75     sub x_symlink { print "symlink\n"; return symlink(shift,fixup(shift)) ? 0 : -$!; }
76    
77     sub x_rename {
78     my ($old) = fixup(shift);
79     my ($new) = fixup(shift);
80     my ($err) = rename($old,$new) ? 0 : -ENOENT();
81     return $err;
82     }
83     sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
84     sub x_chown {
85     my ($fn) = fixup(shift);
86     print "nonexistent $fn\n" unless -e $fn;
87     my ($uid,$gid) = @_;
88     # perl's chown() does not chown symlinks, it chowns the symlink's
89     # target. it fails when the link's target doesn't exist, because
90     # the stat64() syscall fails.
91     # this causes error messages when unpacking symlinks in tarballs.
92     my ($err) = syscall(&SYS_lchown,$fn,$uid,$gid,$fn) ? -$! : 0;
93     return $err;
94     }
95     sub x_chmod {
96     my ($fn) = fixup(shift);
97     my ($mode) = shift;
98     my ($err) = chmod($mode,$fn) ? 0 : -$!;
99     return $err;
100     }
101     sub x_truncate { return truncate(fixup(shift),shift) ? 0 : -$! ; }
102     sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
103    
104     sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
105     sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
106    
107     sub x_mknod {
108     # since this is called for ALL files, not just devices, I'll do some checks
109     # and possibly run the real mknod command.
110     my ($file, $modes, $dev) = @_;
111     $file = fixup($file);
112     $! = 0;
113     syscall(&SYS_mknod,$file,$modes,$dev);
114     return -$!;
115     }
116    
117     # kludge
118     sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
119    
120     $| = 1;
121     my ($len);
122     while(read(STDIN,$len,9) == 9) {
123     chomp $len;
124     my ($data,$VAR1,@args);
125     eval {
126     $SIG{ALRM} = sub { die "timeout\n"};
127     $data = "";
128     alarm 5;
129     read(STDIN,$data,$len-length($data),length($data))
130     while(length($data) < $len);
131     alarm 0;
132     };
133     die $@ if $@;
134     eval $data;
135     @args = @{$VAR1};
136     my $cmd = shift(@args);
137     exit 0 if $cmd eq "bye";
138     die "cannot find command $cmd\n" unless exists($main::{"x_$cmd"});
139     @args = $main::{"x_$cmd"}(@args);
140     $cmd = Dumper(\@args)."\n";
141     $cmd = sprintf("%08i\n%s",length($cmd),$cmd);
142     print $cmd;
143     }

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