Re: [PATCH] Don't require libcap-ng for virtfs support

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

On Friday, April 21, 2023 3:53:27 PM CEST Peter Foley wrote:
> It's only required for the proxy helper.
> 
> Signed-off-by: Peter Foley <pefoley@google.com>
> ---
>  meson.build | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/meson.build b/meson.build
> index c44d05a13f..1d4888b1c0 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -1759,12 +1759,12 @@ have_virtfs = get_option('virtfs') \
>               error_message: 'virtio-9p (virtfs) requires Linux or macOS') \
>      .require(targetos == 'linux' or cc.has_function('pthread_fchdir_np'),
>               error_message: 'virtio-9p (virtfs) on macOS requires the presence of pthread_fchdir_np') \
> -    .require(targetos == 'darwin' or (libattr.found() and libcap_ng.found()),
> -             error_message: 'virtio-9p (virtfs) on Linux requires libcap-ng-devel and libattr-devel') \
> +    .require(targetos == 'darwin' or libattr.found(),
> +             error_message: 'virtio-9p (virtfs) on Linux requires libattr-devel') \
>      .disable_auto_if(not have_tools and not have_system) \
>      .allowed()
>  
> -have_virtfs_proxy_helper = targetos != 'darwin' and have_virtfs and have_tools
> +have_virtfs_proxy_helper = targetos != 'darwin' and have_virtfs and have_tools and libcap_ng.found()

Well, I don't know how many people actually use the 9p proxy, if at all, but
don't you think there should be at least a warning or some kind of output e.g.
in the configure summary that QEMU would build without 9p proxy support just
because of a missing lib, instead of silently disabling it?

For macOS hosts we didn't care so far, because proxy is not implemented there
and probably never will.

>  
>  if get_option('block_drv_ro_whitelist') == ''
>    config_host_data.set('CONFIG_BDRV_RO_WHITELIST', '')
>