/[fuse_dbi]/trunk/fuse_dbi.pl
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /trunk/fuse_dbi.pl

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Revision 3 - (show annotations)
Wed Aug 4 09:25:31 2004 UTC (17 years, 4 months ago) by dpavlin
File MIME type: text/plain
File size: 4305 byte(s)
file reading fix

1 #!/usr/bin/perl
2
3 use POSIX qw(ENOENT EISDIR EINVAL);
4 use Fuse;
5
6 use DBI;
7 use strict;
8
9 my $sql_filenames = q{
10 select
11 oid as id,
12 namespace||'/'||name||' ['||oid||']' as filename,
13 length(template) as size,
14 iseditable as writable
15 from template ;
16 };
17
18 my $sql_content = q{
19 select template
20 from template
21 where oid = ?;
22 };
23
24
25 my $connect = "DBI:Pg:dbname=webgui";
26
27 my $dbh = DBI->connect($connect,"","") || die $DBI::errstr;
28
29 print STDERR "$sql_filenames\n";
30
31 my $sth_filenames = $dbh->prepare($sql_filenames) || die $dbh->errstr();
32 $sth_filenames->execute() || die $sth_filenames->errstr();
33
34 my $sth_content = $dbh->prepare($sql_content) || die $dbh->errstr();
35
36 print "#",join(",",@{ $sth_filenames->{NAME} }),"\n";
37
38 my $ctime_start = time();
39
40 my (%files) = (
41 '.' => {
42 type => 0040,
43 mode => 0755,
44 },
45 # a => {
46 # cont => "File 'a'.\n",
47 # type => 0100,
48 # ctime => time()-2000
49 # },
50 );
51
52 my %dirs;
53
54 while (my $row = $sth_filenames->fetchrow_hashref() ) {
55 $files{$row->{'filename'}} = {
56 size => $row->{'size'},
57 mode => $row->{'writable'} ? 0644 : 0444,
58 id => $row->{'id'} || 99,
59 };
60
61 my $d;
62 foreach (split(m!/!, $row->{'filename'})) {
63 # first, entry is assumed to be file
64 if ($d) {
65 $files{$d} = {
66 size => $dirs{$d}++,
67 mode => 0755,
68 type => 0040
69 };
70 $files{$d.'/.'} = {
71 mode => 0755,
72 type => 0040
73 };
74 $files{$d.'/..'} = {
75 mode => 0755,
76 type => 0040
77 };
78 }
79 $d .= "/" if ($d);
80 $d .= "$_";
81 }
82 }
83
84 print scalar (keys %dirs), " dirs:",join(" ",keys %dirs),"\n";
85
86 sub filename_fixup {
87 my ($file) = shift;
88 $file =~ s,^/,,;
89 $file = '.' unless length($file);
90 return $file;
91 }
92
93 sub e_getattr {
94 my ($file) = filename_fixup(shift);
95 $file =~ s,^/,,;
96 $file = '.' unless length($file);
97 return -ENOENT() unless exists($files{$file});
98 my ($size) = $files{$file}{size} || 1;
99 my ($dev, $ino, $rdev, $blocks, $gid, $uid, $nlink, $blksize) = (0,0,0,1,0,0,1,1024);
100 my ($atime, $ctime, $mtime);
101 $atime = $ctime = $mtime = $files{$file}{ctime} || $ctime_start;
102
103 my ($modes) = (($files{$file}{type} || 0100)<<9) + $files{$file}{mode};
104
105 # 2 possible types of return values:
106 #return -ENOENT(); # or any other error you care to
107 #print(join(",",($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks)),"\n");
108 return ($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks);
109 }
110
111 sub e_getdir {
112 my ($dirname) = shift;
113 $dirname =~ s!^/!!;
114 # return as many text filenames as you like, followed by the retval.
115 print((scalar keys %files)." files total\n");
116 my %out;
117 foreach (keys %files) {
118 my $f = $_;
119 $f =~ s/^\E$dirname\Q//;
120 $f =~ s/^\///;
121 if ($dirname) {
122 $out{$f}++ if (/^\E$dirname\Q/ && $f =~ /^[^\/]+$/);
123 } else {
124 $out{$f}++ if ($f =~ /^[^\/]+$/);
125 }
126 print "f: $_ -> $f\n";
127 }
128 if (! %out) {
129 $out{'no files? bug?'}++;
130 }
131 print scalar keys %out," files found for '$dirname': ",keys %out,"\n";
132 return (keys %out),0;
133 }
134
135 sub e_open {
136 # VFS sanity check; it keeps all the necessary state, not much to do here.
137 my ($file) = filename_fixup(shift);
138 return -ENOENT() unless exists($files{$file});
139 return -EISDIR() unless exists($files{$file}{id});
140 if (!exists($files{$file}{cont})) {
141 $sth_content->execute($files{$file}{id});
142 $files{$file}{cont} = $sth_content->fetchrow_array;
143 }
144 print "open '$file' ",length($files{$file}{cont})," bytes\n";
145 return 0;
146 }
147
148 sub e_read {
149 # return an error numeric, or binary/text string.
150 # (note: 0 means EOF, "0" will give a byte (ascii "0")
151 # to the reading program)
152 my ($file) = filename_fixup(shift);
153 my ($buf,$off) = @_;
154
155 return -ENOENT() unless exists($files{$file});
156
157 my $len = length($files{$file}{cont});
158
159 print "read '$file' [$len bytes] offset $off length $buf\n";
160
161 return -EINVAL() if ($off > $len);
162 return 0 if ($off == $len);
163
164 $buf = $len-$off if ($off+$buf > $len);
165
166 return substr($files{$file}{cont},$off,$buf);
167 }
168
169 sub e_statfs { return 255, 1, 1, 1, 1, 2 }
170
171 # If you run the script directly, it will run fusermount, which will in turn
172 # re-run this script. Hence the funky semantics.
173 my ($mountpoint) = "";
174 $mountpoint = shift(@ARGV) if @ARGV;
175 Fuse::main(
176 mountpoint=>$mountpoint,
177 getattr=>\&e_getattr,
178 getdir=>\&e_getdir,
179 open=>\&e_open,
180 statfs=>\&e_statfs,
181 read=>\&e_read,
182 debug=>1,
183 );

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