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Re: [BackupPC-users] Installation problems: BackupPC_serverMesg hangs
2010-04-12 11:53:56
Hi
I'm really off my league, here
I did a strace on my backuppc 3.0.0 on ubuntu 8.04 (and got "Got reply: ok")
$ strace ./BackupPC_serverMesg status 2> temp.txt
But I get nothing like your trace
$ cat temp.txt |grep connect
connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
connect(3, {sa_family=AF_FILE, path="/var/lib/backuppc/BackupPC.sock"}, 110) = 0
I have all this perl stuff :)
dpkg -l | grep -i perl
ii libarchive-zip-perl 1.18-1 Module for manipulation of ZIP archives
ii libcompress-raw-zlib-perl 2.008-1ubuntu0.1 low-level interface to zlib compression libr
ii libcompress-zlib-perl 2.008-1 Perl module for creation and manipulation of
ii libdbd-mysql-perl 4.005-1 A Perl5 database interface to the MySQL data
ii libdbi-perl 1.601-1 Perl5 database interface by Tim Bunce
ii libfile-rsyncp-perl 0.68-1 A perl based implementation of an Rsync clie
ii libfuse-perl 0.09-2 Write filesystems in Perl using FUSE
ii libhtml-parser-perl 3.56-1ubuntu0.1 A collection of modules that parse HTML text
ii libhtml-tagset-perl 3.10-2 Data tables pertaining to HTML
ii libhtml-template-perl 2.9-1 HTML::Template : A module for using HTML Tem
ii libhtml-tree-perl 3.23-1 represent and create HTML syntax trees
ii libio-compress-base-perl 2.008-1 Base Class for IO::Compress modules
ii libio-compress-zlib-perl 2.008-1 Perl interface to zlib
ii liblocale-gettext-perl 1.05-2ubuntu1 Using libc functions for internationalizatio
ii libnet-daemon-perl 0.38-1.1 Perl module for building portable Perl daemo
ii libpcre3 7.4-1ubuntu2.1 Perl 5 Compatible Regular _expression_ Library
ii libperl5.8 5.8.8-12ubuntu0.4 Shared Perl library
ii libplrpc-perl 0.2017-1.1 Perl extensions for writing PlRPC servers an
ii librpc-xml-perl 0.59-2 Perl module implementation of XML-RPC
ii libterm-readkey-perl 2.30-3ubuntu1 A perl module for simple terminal control
ii libtext-charwidth-perl 0.04-4build1 get display widths of characters on the term
ii libtext-iconv-perl 1.4-3 converts between character sets in Perl
ii libtext-wrapi18n-perl 0.06-5 internationalized substitute of Text::Wrap
ii liburi-perl 1.35.dfsg.1-1 Manipulates and accesses URI strings
ii libwww-perl 5.808-1 WWW client/server library for Perl (aka LWP)
ii libxml-parser-perl 2.34-4.3 Perl module for parsing XML files
ii perl 5.8.8-12ubuntu0.4 Larry Wall's Practical Extraction and Report
ii perl-base 5.8.8-12ubuntu0.4 The Pathologically Eclectic Rubbish Lister
ii perl-modules 5.8.8-12ubuntu0.4 Core Perl modules
ii perl-suid 5.8.8-12ubuntu0.4 Runs setuid Perl scripts
You may want to try, if you didn't yet, to install a stable version of backuppc instead of BackupPC-3.2.0beta1.
Maybe it makes no difference, I guess
Good luck, hope someone who knows openwrt and perl can give you a hand.
Luis
On Mon, Apr 12, 2010 at 4:03 PM, Bruce <bruce AT sqls DOT net> wrote:
Hmmn, Alright. I'll try to add more details. Sorry I wasn't more clear
previously. I had thought I was responding to that thread on the forum
and so left out some details that I felt was already clear in the
forum. But this being put here on the mailing list, I can see how it
seems out of context.
Here's a link to the previous e-mails on this, probably in a more
comfortable format. Just from the archives for this mailing list.
http://sourceforge.net/mailarchive/message.php?msg_id=200908251808.11116.chrdr%40gmx.at
The problem is, I cannot communicate with the BackupPC server. It is
installed and it does run without any errors.
But when I try to run, say..
BackupPC_serverMesg status info
The command just hangs. The strace information I provided shows that
it's hanging when trying to read input from the backuppc daemon.
The strace information on the daemon shows that it never gets any
requests from the client, it sits on the "select" (line 785 of BackupPC
code) command waiting for some sort of input from any of the handlers
and never gets anything. The same is true regardless of connecting via
sockets or tcp.
My limited perl skill mixed with some google searches leads me to
understand that all the input handlers are added up into a variable
called FDread using a "vec" command. Then this value is handed off to
the "select" command where I understand it breaks that FDread variable
back up and listens on all of the given sources. Looking at the bug
report https://dev.openwrt.org/ticket/6900 makes me wonder if some
big/little endian difference is causing the vec or select commands to
add up the values incorrectly and if so, maybe the select command isn't
listening on all (or any) of the input sources.
So, what I'm hoping to find out is rather or not this is really how the
backuppc daemon works and if there's some way to fix the problem.
Luis Paulo wrote:
> Hi, Bruce
>
> My point is that you still don't give me anything to work on
>
> That strace don't mean a thing to me
>
> The other thread didn't add nothing
>
> And, as far as I know, the backuppc server is running on an Access
> point...
>
> I only know (besides the strace) the backup server hangs (or not), and
> you are not a very good perl programmer
>
> And that you think, it's because it "never actually gets the requests
> from clients because it doesn't hear them", "number is being passed to
> the select command is wrong", "big/little endian differences"
>
> No logs, no commands you have tried
>
> I'm sure you have put a lot of effort on this, but it seems you are
> stuck, not able to look in other directions.
> Is it really a code problem?
>
> Can't help you in any aspect. Really don't think someone will, hope
> I'm wrong.
>
> Regards
> Luis
>
> PS: Don't mind the tone, please. Wish I could be of some help.
>
>
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