Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number.

["Daniel P. Berrange" <berrange@redhat.com>]

On Thu, May 13, 2010 at 10:32:52AM +0200, Jes.Sorensen@redhat.com wrote:
> From: Jes Sorensen <Jes.Sorensen@redhat.com>
> 
> Add -version-simple argument for QEMU, printing just the version
> number, without any supporting text.
> 
> This makes it simpler for other apps, such as libvirt, to parse the
> version string from QEMU independant of how the naming string may
> change.
> 
> Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
> ---
>  qemu-options.hx |    8 ++++++++
>  vl.c            |    9 +++++++++
>  2 files changed, 17 insertions(+), 0 deletions(-)
> 
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 12f6b51..e4f3979 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -27,6 +27,14 @@ STEXI
>  Display version information and exit
>  ETEXI
>  
> +DEF("version-simple", 0, QEMU_OPTION_version_simple,
> +    "-version-simple display version information and exit\n", QEMU_ARCH_ALL)
> +STEXI
> +@item -version-simple
> +@findex -version-simple
> +Display basic version number information and exit
> +ETEXI
> +
>  DEF("M", HAS_ARG, QEMU_OPTION_M,
>      "-M machine      select emulated machine (-M ? for list)\n", QEMU_ARCH_ALL)
>  STEXI
> diff --git a/vl.c b/vl.c
> index 85bcc84..5adca87 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -2015,6 +2015,11 @@ static void version(void)
>      printf("QEMU emulator version " QEMU_VERSION QEMU_PKGVERSION ", Copyright (c) 2003-2008 Fabrice Bellard\n");
>  }
>  
> +static void version_simple(void)
> +{
> +    printf(QEMU_VERSION QEMU_PKGVERSION "\n");
> +}
> +
>  static void help(int exitcode)
>  {
>      const char *options_help =
> @@ -2960,6 +2965,10 @@ int main(int argc, char **argv, char **envp)
>                  version();
>                  exit(0);
>                  break;
> +            case QEMU_OPTION_version_simple:
> +                version_simple();
> +                exit(0);
> +                break;
>              case QEMU_OPTION_m: {
>                  uint64_t value;
>                  char *ptr;

This omits the KVM version string which is something we also want to see.
It would also be nice to avoid having to parse the -help output to determine
ARGV supported too. I wonder if it would be a good idea to just produce a
well structured equivalent to -help that provides the same data, but in 
JSON format for sane parsing. That would let peple easily determine the
supported ARGV as well as version number(s)

Regards,
Daniel
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