Re: [Qemu-devel] [PATCH 2/2] Explicitly print out default vnc option in use

[Robert Hu <robert.hu@vmm.sh.intel.com>]

On Tue, 2016-06-07 at 08:28 +0800, Robert Hu wrote:
> On Mon, 2016-06-06 at 09:28 +0200, Markus Armbruster wrote:
> > Robert Hu <robert.hu@vmm.sh.intel.com> writes:
> > 
> > > On Tue, 2016-05-31 at 13:17 +0200, Markus Armbruster wrote:
> > >> Robert Hu <robert.hu@vmm.sh.intel.com> writes:
> > >> 
> > >> > On Tue, 2016-05-31 at 09:51 +0200, Markus Armbruster wrote:
> [trim...]
> > > I don't see a './configure' option related to this '-vnc to' param. Is
> > > there any?
> > > '--help', you mean 'qemu-system_x86-64 --help'? or './configure --help'?
> [seems repeated contents, trim...]
> > > I don't see a './configure' option related to this '-vnc to' param. Is
> > > there any?
> > > '--help', you mean 'qemu-system_x86-64 --help'? or './configure --help'?
> > 
> > The former.
> > 
> > The modern way to select a display is -display.  The older -nographic,
> > -curses, -sdl are retained for backward compatibility.
> > 
> > Relevant parts of -help:
> > 
> >     Display options:
> >     -display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off]
> >                 [,window_close=on|off]|curses|none|
> >                 gtk[,grab_on_hover=on|off]|
> >                 vnc=<display>[,<optargs>]
> >                     select display type
> >     -nographic      disable graphical output and redirect serial I/Os to console
> >     -curses         use a curses/ncurses interface instead of SDL
> >     [...]
> >     -sdl            enable SDL
> >     [...]
> >     -vnc display    start a VNC server on display
> > 
> > Issues:
> > 
> > * Help for -display is broken: the mutually exclusive option arguments
> >   are concatenated.  -display curses and -display none are undocumented.
> >   It should look more like this:
> > 
> >     -display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off]
> >                 [,window_close=on|off]|curses|none|
> >     -display gtk[,grab_on_hover=on|off]|
> >     -display vnc=<display>[,<optargs>]
> >     -display curses
> >     -display none
> >                     select display type
> > 
> > * -display sdl,gl=on|off and -display gtk,gl=on|off are undocumented
> >    (missed in commit 0b71a5d5c and 97edf3b).
> > 
> > * There is no help on the <display> in -display vnc=<display>.
> > 
> > * There is no help on the default.  main() picks the default depending
> >   on configure options:
> > 
> >     #if defined(CONFIG_GTK)
> >             display_type = DT_GTK;
> >     #elif defined(CONFIG_SDL)
> >             display_type = DT_SDL;
> >     #elif defined(CONFIG_COCOA)
> >             display_type = DT_COCOA;
> >     #elif defined(CONFIG_VNC)
> >             vnc_parse("localhost:0,to=99,id=default", &error_abort);
> >             show_vnc_port = 1;
> >     #else
> >             display_type = DT_NONE;
> >     #endif
> > 
> >   Help should show the default this binary will pick.  This is what I
> >   meant by "Ideally, --help output would show the defaults for this
> >   build's configuration."
> > 
> > * Help should explain syntacic sugar:
> >   -curses is sugar for -display curses
> >   -sdl is sugar for -display sdl
> >   -vnc display is sugar for -display vnc=display
> > 
> >   -nographic is also sugar, but too complicated to explain; I'd leave it
> >   as is.
> > 
> > Non-issue
> > 
> > * Help shows options even when they're not compiled in.  That's okay,
> >   because trying to use them fails with an "FOO support is disabled"
> >   error message.
> > 
> > >> If we decide users need more information than the current "VNC server
> > >> running on" line, perhaps it should be included right in that line.
> > 
> > This would complement, but not replace better -help ouput.
> > 
> > If you would like to work on these issues, let us know.
> 
> OK, if not in a hurry and assuming this is not a huge amount of work.
> I also need to look into the build arch so that completely understand
> your 'the default this binary will pick', till now I don't.
> 
> Another concern is that I'm not a native English speaker, so those
> description words may not be that apt and concise.
> 
> Meanwhile, this is another work extended from the original patch. How
> about accept the patch 1 first? as you and Paolo both think it is OK.
> Ought I rework a version 2 of single patch 1? or not necessary?
Oh, I see Paolo already get it in. Thanks!
> 
>