#!/usr/bin/perl
-use POSIX qw(ENOENT EISDIR EINVAL);
+use POSIX qw(ENOENT EISDIR EINVAL O_RDWR);
use Fuse;
use DBI;
from template ;
};
-my $sql_content = q{
+my $sql_read = q{
select template
- from template
- where oid = ?;
+ from template
+ where oid = ?;
+};
+
+my $sql_update = q{
+ update template
+ set template = ?
+ where oid = ?;
};
my $sth_filenames = $dbh->prepare($sql_filenames) || die $dbh->errstr();
$sth_filenames->execute() || die $sth_filenames->errstr();
-my $sth_content = $dbh->prepare($sql_content) || die $dbh->errstr();
+my $sth_read = $dbh->prepare($sql_read) || die $dbh->errstr();
+my $sth_update = $dbh->prepare($sql_update) || die $dbh->errstr();
print "#",join(",",@{ $sth_filenames->{NAME} }),"\n";
return (keys %out),0;
}
+my $in_transaction = 0;
+
sub e_open {
# VFS sanity check; it keeps all the necessary state, not much to do here.
- my ($file) = filename_fixup(shift);
+ my $file = filename_fixup(shift);
+ my $flags = shift;
+
return -ENOENT() unless exists($files{$file});
return -EISDIR() unless exists($files{$file}{id});
+
+ if (! $in_transaction) {
+ # begin transaction
+ if (! $dbh->begin_work) {
+ print "transaction begin: ",$dbh->errstr;
+ return -ENOENT();
+ }
+ }
+ $in_transaction++;
+ print "files opened: $in_transaction\n";
+
if (!exists($files{$file}{cont})) {
- $sth_content->execute($files{$file}{id});
- $files{$file}{cont} = $sth_content->fetchrow_array;
+ $sth_read->execute($files{$file}{id}) || die $sth_read->errstr;
+ $files{$file}{cont} = $sth_read->fetchrow_array;
}
print "open '$file' ",length($files{$file}{cont})," bytes\n";
return 0;
return substr($files{$file}{cont},$off,$buf);
}
+sub clear_cont {
+ print "invalidate all cached content\n";
+ foreach my $f (keys %files) {
+ delete $files{$f}{cont};
+ }
+}
+
+
+sub update_db {
+ my $file = shift || die;
+
+ if (!$sth_update->execute($files{$file}{cont},$files{$file}{id})) {
+ print "update problem: ",$sth_update->errstr;
+ $dbh->rollback;
+ clear_cont;
+ $dbh->begin_work;
+ return 0;
+ } else {
+ if ($dbh->commit) {
+ print "commit problem: ",$sth_update->errstr;
+ $dbh->rollback;
+ clear_cont;
+ $dbh->begin_work;
+ return 0;
+ }
+ print "updated '$file' [",$files{$file}{id},"]\n";
+ }
+ return 1;
+}
+
+sub e_write {
+ my $file = filename_fixup(shift);
+ my ($buf,$off) = @_;
+
+ return -ENOENT() unless exists($files{$file});
+
+ my $len = length($files{$file}{cont});
+
+ print "write '$file' [$len bytes] offset $off length $buf\n";
+
+ $files{$file}{cont} =
+ substr($files{$file}{cont},0,$off) .
+ $buf .
+ substr($files{$file}{cont},$off+length($buf));
+
+ if (! update_db($file)) {
+ return -ENOSYS();
+ } else {
+ return length($buf);
+ }
+}
+
+sub e_truncate {
+ my $file = filename_fixup(shift);
+ my $size = shift;
+
+ $files{$file}{cont} = substr($files{$file}{cont},0,$size);
+ return 0
+};
+
+
+sub e_utime {
+ my ($atime,$mtime,$file) = @_;
+ $file = filename_fixup($file);
+
+ return -ENOENT() unless exists($files{$file});
+
+ $files{$file}{time} = $mtime;
+ return 0;
+}
+
sub e_statfs { return 255, 1, 1, 1, 1, 2 }
# If you run the script directly, it will run fusermount, which will in turn
open=>\&e_open,
statfs=>\&e_statfs,
read=>\&e_read,
+ write=>\&e_write,
+ utime=>\&e_utime,
+ truncate=>\&e_truncate,
debug=>1,
);