[v2] scripts/runqemu: Add possibility to disable network

Default network configuration requires tun/tap module and while being
usable it conflicts with tap devices created by VPN clients sometimes
and requires root permissions to use . While it's possible to work
this around it's not always feasible if network is not required
Add nonetwork option which can be specified if the network connectivity is
not needed and SDL/serial is enough to communicate with the image.

Signed-off-by: Pavel Zhukov <pazhukov@suse.de>
---
 scripts/runqemu | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Hi,

On Tue, Apr 18, 2023 at 03:33:25PM +0200, Pavel Zhukov wrote:
> Default network configuration requires tun/tap module and while being
> usable it conflicts with tap devices created by VPN clients sometimes
> and requires root permissions to use . While it's possible to work
> this around it's not always feasible if network is not required
> Add nonetwork option which can be specified if the network connectivity is
> not needed and SDL/serial is enough to communicate with the image.

Using slirp networking is also handy. Only needs localhost to be up.

But having option for no networking at all is useful too.

Cheers,

-Mikko

> Signed-off-by: Pavel Zhukov <pazhukov@suse.de>
> ---
>  scripts/runqemu | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/runqemu b/scripts/runqemu
> index 4c06cefbff..56715c3e1e 100755
> --- a/scripts/runqemu
> +++ b/scripts/runqemu
> @@ -66,6 +66,7 @@ of the following environment variables (in any order):
>    MACHINE - the machine name (optional, autodetected from KERNEL filename if unspecified)
>    Simplified QEMU command-line options can be passed with:
>      nographic - disable video console
> +    nonetwork - disable network connectivity
>      novga - Disable VGA emulation completely
>      sdl - choose the SDL UI frontend
>      gtk - choose the Gtk UI frontend
> @@ -178,6 +179,7 @@ class BaseConfig(object):
>          self.serialconsole = False
>          self.serialstdio = False
>          self.nographic = False
> +        self.nonetwork = False
>          self.sdl = False
>          self.gtk = False
>          self.gl = False
> @@ -495,6 +497,8 @@ to your build configuration.
>                  self.check_arg_fstype(arg)
>              elif arg == 'nographic':
>                  self.nographic = True
> +            elif arg == "nonetwork":
> +                self.nonetwork = True
>              elif arg == 'sdl':
>                  self.sdl = True
>              elif arg == 'gtk':
> @@ -1224,7 +1228,8 @@ to your build configuration.
>          self.set('NETWORK_CMD', '%s %s' % (self.network_device.replace('@MAC@', mac), qemu_tap_opt))
>  
>      def setup_network(self):
> -        if self.get('QB_NET') == 'none':
> +        if self.nonetwork or self.get('QB_NET') == 'none':
> +            self.set('NETWORK_CMD', '-nic none')
>              return
>          if sys.stdin.isatty():
>              self.saved_stty = subprocess.check_output(("stty", "-g")).decode('utf-8').strip()
> -- 
> 2.39.2
> 

> 
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