Bug#513315: Times out waiting for index to be rebuilt

[Enrico Zini]

On Tue, Jan 27, 2009 at 04:01:13PM -0800, Matt Kraai wrote:

> When I try to create an experimental pbuilder chroot using
>  pbuilder --create --distribution experimental
> it fails with the following error message:
[...]
>  Rebuilding Xapian index... 39% 
>  Traceback (most recent call last):
>    File "/usr/sbin/update-apt-xapian-index", line 527, in <module>
>      childProgress.loop()
>    File "/usr/sbin/update-apt-xapian-index", line 125, in loop
>      msg = self.sock.recv(4096)
>  socket.timeout: timed out
[...]
> I can't figure out why that exception is raised, however: according to
> the exception's documentation, it's raised if the timeout's been set
> via a call to settimeout, but there are no such calls in
> update-apt-xapian-index.

Indeed, according to the exception documentation, the default is None
(no timeout), but if I add this to the code, just after
self.sock.connect(XAPIANDBUPDATESOCK) in ClientProgress.__init__:

   print "TIMEOUT", self.sock.gettimeout()

I get a nice "2.0".

This patch fixes the problem:

   diff --git a/update-apt-xapian-index b/update-apt-xapian-index
   index ad815f4..31ecad9 100755
   --- a/update-apt-xapian-index
   +++ b/update-apt-xapian-index
   @@ -116,6 +116,7 @@ class SilentProgress:
    class ClientProgress:
        def __init__(self, progress):
            self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
   +        self.sock.settimeout(None)
            self.sock.connect(XAPIANDBUPDATESOCK)
            self.progress = progress

I can reproduce the issue with this snippet:

   #!/usr/bin/python
   
   import apt, socket
   
   srv = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
   srv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
   srv.bind("/tmp/foo.sock")
   srv.setblocking(False)
   srv.listen(5)
   
   sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
   sock.connect("/tmp/foo.sock")
   print sock.gettimeout()
   
   s1 = srv.accept()[0]
   s1.send("ciao")
   
   print sock.recv(4096)

Importing "apt" is what makes the problem reappear: apt seems to be
changing the default timeout from None to 2.0: I'll reassign this bug
to python-apt.


Ciao,

Enrico

-- 
GPG key: 1024D/797EBFAB 2000-12-05 Enrico Zini <enr...@debian.org>

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