configure: add option for virtiofsd

Currently it is unknown whether virtiofsd will be built at
configuration time. It will be automatically built when dependency
is met. Also, required libraries are not clear.

To make this clear, add configure option --{enable,disable}-virtiofsd.
The default is the same as current (enabled if available) like many
other options. When --enable-virtiofsd is given and dependency is not
met, we get:

  ERROR: Problem encountered: virtiofsd requires libcap-ng-devel and seccomp-devel
or
  ERROR: Problem encountered: virtiofsd needs tools and vhost-user support

In addition, configuration summary now includes virtiofsd entry:

  build virtiofs daemon: YES/NO

Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Message-Id: <20201008103133.2722903-1-misono.tomohiro@jp.fujitsu.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  Manual merge

configure

@@ -302,6 +302,7 @@ fdt="auto"
 netmap="no"
 sdl="auto"
 sdl_image="auto"
+virtiofsd="auto"
 virtfs=""
 libudev="auto"
 mpath="auto"
@@ -999,6 +1000,10 @@ for opt do
   ;;
   --enable-libudev) libudev="enabled"
   ;;
+  --disable-virtiofsd) virtiofsd="disabled"
+  ;;
+  --enable-virtiofsd) virtiofsd="enabled"
+  ;;
   --disable-mpath) mpath="disabled"
   ;;
   --enable-mpath) mpath="enabled"
@@ -1758,6 +1763,7 @@ disabled with --disable-FEATURE, default is enabled if available:
   vnc-png         PNG compression for VNC server
   cocoa           Cocoa UI (Mac OS X only)
   virtfs          VirtFS
+  virtiofsd       build virtiofs daemon (virtiofsd)
   libudev         Use libudev to enumerate host devices
   mpath           Multipath persistent reservation passthrough
   xen             xen backend driver support
@@ -6972,7 +6978,7 @@ NINJA=$ninja $meson setup \
         -Dxen=$xen -Dxen_pci_passthrough=$xen_pci_passthrough -Dtcg=$tcg \
         -Dcocoa=$cocoa -Dmpath=$mpath -Dsdl=$sdl -Dsdl_image=$sdl_image \
         -Dvnc=$vnc -Dvnc_sasl=$vnc_sasl -Dvnc_jpeg=$vnc_jpeg -Dvnc_png=$vnc_png \
-        -Dgettext=$gettext -Dxkbcommon=$xkbcommon -Du2f=$u2f \
+        -Dgettext=$gettext -Dxkbcommon=$xkbcommon -Du2f=$u2f -Dvirtiofsd=$virtiofsd \
         -Dcapstone=$capstone -Dslirp=$slirp -Dfdt=$fdt \
         -Diconv=$iconv -Dcurses=$curses -Dlibudev=$libudev\
         -Ddocs=$docs -Dsphinx_build=$sphinx_build -Dinstall_blobs=$blobs \

meson.build

@@ -2045,6 +2045,7 @@ summary_info += {'Audio drivers':     config_host['CONFIG_AUDIO_DRIVERS']}
 summary_info += {'Block whitelist (rw)': config_host['CONFIG_BDRV_RW_WHITELIST']}
 summary_info += {'Block whitelist (ro)': config_host['CONFIG_BDRV_RO_WHITELIST']}
 summary_info += {'VirtFS support':    config_host.has_key('CONFIG_VIRTFS')}
+summary_info += {'build virtiofs daemon': have_virtiofsd}
 summary_info += {'Multipath support': mpathpersist.found()}
 summary_info += {'VNC support':       vnc.found()}
 if vnc.found()

meson_options.txt

@@ -62,6 +62,8 @@ option('vnc_sasl', type : 'feature', value : 'auto',
        description: 'SASL authentication for VNC server')
 option('xkbcommon', type : 'feature', value : 'auto',
        description: 'xkbcommon support')
+option('virtiofsd', type: 'feature', value: 'auto',
+       description: 'build virtiofs daemon (virtiofsd)')
 
 option('capstone', type: 'combo', value: 'auto',
        choices: ['disabled', 'enabled', 'auto', 'system', 'internal'],

tools/meson.build

@@ -1,10 +1,23 @@
-have_virtiofsd = (have_system and
+have_virtiofsd = (targetos == 'linux' and
     have_tools and
-    'CONFIG_LINUX' in config_host and 
     'CONFIG_SECCOMP' in config_host and
     'CONFIG_LIBCAP_NG' in config_host and
     'CONFIG_VHOST_USER' in config_host)
 
+if get_option('virtiofsd').enabled()
+  if not have_virtiofsd
+    if targetos != 'linux'
+      error('virtiofsd requires Linux')
+    elif 'CONFIG_SECCOMP' not in config_host or 'CONFIG_LIBCAP_NG' not in config_host
+      error('virtiofsd requires libcap-ng-devel and seccomp-devel')
+    elif not have_tools or 'CONFIG_VHOST_USER' not in config_host
+      error('virtiofsd needs tools and vhost-user support')
+    endif
+  endif
+elif get_option('virtiofsd').disabled() or not have_system
+  have_virtiofsd = false
+endif
+
 if have_virtiofsd
   subdir('virtiofsd')
 endif