Re: [PATCH v3] Don't require libcap-ng for virtfs support

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

On Wednesday, May 3, 2023 3:07:56 PM CEST Peter Foley wrote:
> It's only required for the proxy helper.
> 
> Add a new option for the proxy helper rather than enabling it
> implicitly.
> 
> Change-Id: I95b73fca625529e99d16b0a64e01c65c0c1d43f2
> Signed-off-by: Peter Foley <pefoley@google.com>
> ---

LGTM now, queued on 9p.next:
https://github.com/cschoenebeck/qemu/commits/9p.next

Thanks!

Best regards,
Christian Schoenebeck

>  meson.build                   | 12 +++++++++---
>  meson_options.txt             |  2 ++
>  scripts/meson-buildoptions.sh |  4 ++++
>  3 files changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/meson.build b/meson.build
> index 77d42898c8..a46bc67cdb 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -1759,12 +1759,17 @@ 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 = get_option('virtfs_proxy_helper') \
> +    .require(targetos != 'darwin', error_message: 'the virtfs proxy helper is incompatible with macOS') \
> +    .require(have_virtfs, error_message: 'the virtfs proxy helper requires that virtfs is enabled') \
> +    .disable_auto_if(not have_tools) \
> +    .require(libcap_ng.found(), error_message: 'the virtfs proxy helper requires libcap-ng') \
> +    .allowed()
>  
>  if get_option('block_drv_ro_whitelist') == ''
>    config_host_data.set('CONFIG_BDRV_RO_WHITELIST', '')
> @@ -3911,6 +3916,7 @@ if have_block
>    summary_info += {'Block whitelist (ro)': get_option('block_drv_ro_whitelist')}
>    summary_info += {'Use block whitelist in tools': get_option('block_drv_whitelist_in_tools')}
>    summary_info += {'VirtFS support':    have_virtfs}
> +  summary_info += {'VirtFS Proxy Helper support': have_virtfs_proxy_helper}
>    summary_info += {'Live block migration': config_host_data.get('CONFIG_LIVE_BLOCK_MIGRATION')}
>    summary_info += {'replication support': config_host_data.get('CONFIG_REPLICATION')}
>    summary_info += {'bochs support':     get_option('bochs').allowed()}
> diff --git a/meson_options.txt b/meson_options.txt
> index 2471dd02da..908b4b7fd9 100644
> --- a/meson_options.txt
> +++ b/meson_options.txt
> @@ -272,6 +272,8 @@ option('vhost_user_blk_server', type: 'feature', value: 'auto',
>         description: 'build vhost-user-blk server')
>  option('virtfs', type: 'feature', value: 'auto',
>         description: 'virtio-9p support')
> +option('virtfs_proxy_helper', type: 'feature', value: 'auto',
> +       description: 'virtio-9p proxy helper support')
>  option('libvduse', type: 'feature', value: 'auto',
>         description: 'build VDUSE Library')
>  option('vduse_blk_export', type: 'feature', value: 'auto',
> diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh
> index d4369a3ad8..3bb9dd3504 100644
> --- a/scripts/meson-buildoptions.sh
> +++ b/scripts/meson-buildoptions.sh
> @@ -176,6 +176,8 @@ meson_options_help() {
>    printf "%s\n" '  vhost-vdpa      vhost-vdpa kernel backend support'
>    printf "%s\n" '  virglrenderer   virgl rendering support'
>    printf "%s\n" '  virtfs          virtio-9p support'
> +  printf "%s\n" '  virtfs-proxy-helper'
> +  printf "%s\n" '                  virtio-9p proxy helper support'
>    printf "%s\n" '  vmnet           vmnet.framework network backend support'
>    printf "%s\n" '  vnc             VNC server'
>    printf "%s\n" '  vnc-jpeg        JPEG lossy compression for VNC server'
> @@ -461,6 +463,8 @@ _meson_option_parse() {
>      --disable-virglrenderer) printf "%s" -Dvirglrenderer=disabled ;;
>      --enable-virtfs) printf "%s" -Dvirtfs=enabled ;;
>      --disable-virtfs) printf "%s" -Dvirtfs=disabled ;;
> +    --enable-virtfs-proxy-helper) printf "%s" -Dvirtfs_proxy_helper=enabled ;;
> +    --disable-virtfs-proxy-helper) printf "%s" -Dvirtfs_proxy_helper=disabled ;;
>      --enable-vmnet) printf "%s" -Dvmnet=enabled ;;
>      --disable-vmnet) printf "%s" -Dvmnet=disabled ;;
>      --enable-vnc) printf "%s" -Dvnc=enabled ;;
>