[libvirt] [PATCH] util: escapes special characters in VIR_LOG_REGEX

[Guannan Ren]

On 03/11/2013 10:10 AM, Osier Yang wrote:
> On 2013年03月09日 22:49, Guannan Ren wrote:
>> In debug mode, the bug failed to start vm
>> error: Failed to start domain rhel5u9
>> error: internal error Out of space while reading console log output:
>
> It's hard to known why the old regex cause error like this, as they
> looks quite unrelated. Can you explain more?
>

        After turning debug mode on, the qemu process redirects its 
standard output into
     log file: eg /var/log/libvirt/qemu/rhel5u9.log  with lots of 
debugging log messages included.
        The regular expression is used to filter out these debugging log 
messages to get
     PTY device used by the qemu instance  like /dev/pts/10 in "char 
device redirected to /dev/pts/10"
        libvirtd reads data from the log file into a buffer with 4096 
size, if the RE doesn't work, the
     buffer is easily out of space before getting the pty device. If it 
works, the buffer only contains
     the device info, however, all of debugging log message strings are 
filtered out.
        The patch fix the failure of the RE.

     Guannan