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

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Revision 10 - (show annotations)
Sun Mar 20 00:36:05 2005 UTC (17 years, 3 months ago) by dpavlin
File MIME type: text/plain
File size: 3474 byte(s)
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 #!/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 sub fixup { return "/tmp/fusetest-" . $ENV{LOGNAME} . shift }
11
12 sub x_getattr {
13 my ($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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