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

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Revision 10 - (hide annotations)
Sun Mar 20 00:36:05 2005 UTC (17 years, 4 months ago) by dpavlin
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From: Richard Dawe <rich(at)phekda(dot)gotadsl(dot)co(dot)uk>

Please find attached a patch that allows Fuse.pm's test suite to run as a
non-root user. It will skip all the tests that require root priveleges (giving
away ownership using chown, mknod of character and block devices). The patch
creates a test root and mount point per user.

The patch also uses POSIX::WEXITSTATUS instead of the less portable "$? >> 8"
idiom.

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

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