fix cups printcap reload where no printers are present

[Jeremy Allison]

On Fri, Dec 31, 2010 at 03:05:37AM +1100, David Disseldorp wrote:
> Hi,
> 
> cups_async_callback() is called to receive new printcap data from a
> child process which requests the information from cupsd.
> 
> Newly received printcap information is stored in a temporary printcap
> cache (tmp_pcap_cache). Once the child process closes the printcap IPC
> file descriptor, the system printcap cache is replaced with the newly
> populated tmp_pcap_cache, however this only occurs if tmp_pcap_cache is
> non null (has at least one printer).
> 
> If the printcap cache is empty, which is the case when cups is not
> exporting any printers, the printcap cache is not replaced resulting in
> stale data.
> 
> These changes are based on top of bug 7836 commits. Reviews, comments
> and feedback invited.
> 
> Cheers, David
> 
> 
> The following changes since commit 42b4095003b0aafaaaccf0be522de1ec183747e3:
> 
>   s3-printing: remove printer_list_need_refresh (2010-12-29 14:21:25 +0100)
> 
> are available in the git repository at:
>   git://oss.sgi.com/ddiss/samba cups_pcap_reload_no_printers
> 
> David Disseldorp (2):
>       s3-printing: remove unneeded local_pcap_copy global
>       s3-printing: fix cups pcap reload with no printers
> 
>  source3/printing/print_cups.c |   87 +++++++++++++++++++---------------------
>  1 files changed, 41 insertions(+), 46 deletions(-)

Missing attachment :-(. Can you re-send ?

Thanks,

Jeremy.