Re: [Qemu-devel] [PATCH v7 07/11] qemu.py: include debug information on launch error

[Cleber Rosa]

On 08/18/2017 01:05 PM, Amador Pahim wrote:
> When launching a VM, if an exception happens and the VM is not
> initiated, it might be useful to see the qemu command line and
> the qemu command output.
> 
> This patch creates that message. Notice that self._iolog needs to be
> cleaned up in the beginning of the launch() to make sure we will not
> expose the qemu log from a previous launch if the current one fails.
> 
> Signed-off-by: Amador Pahim <address@hidden>
> ---
>  scripts/qemu.py | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/scripts/qemu.py b/scripts/qemu.py
> index 0bcec4b3b1..29fd2469f9 100644
> --- a/scripts/qemu.py
> +++ b/scripts/qemu.py
> @@ -147,6 +147,7 @@ class QEMUMachine(object):
>  
>      def launch(self):
>          '''Launch the VM and establish a QMP connection'''
> +        self._iolog = None
>          self._qemu_full_args = None
>          devnull = open(os.path.devnull, 'rb')
>          qemulog = open(self._qemu_log_path, 'wb')
> @@ -162,6 +163,13 @@ class QEMUMachine(object):
>              self._post_launch()
>          except:
>              self.shutdown()
> +
> +            LOG.debug('Error launching VM')
> +            if self._qemu_full_args:
> +                LOG.debug('Command: %r', ' '.join(self._qemu_full_args))
> +            if self._iolog:
> +                LOG.debug('Output: %r', self._iolog)
> +

Based on Fam's comment about the signal message being a warning (worth
showing by default), I also think this deserves more than a "debug"
classification.

- Cleber.

>              raise
>  
>      def shutdown(self):
>

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