virtiofsd: add vhost-user.json file

Install a vhost-user.json file describing virtiofsd.  This allows
libvirt and other management tools to enumerate vhost-user backend
programs.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

.gitignore

@@ -6,6 +6,7 @@
 /config-target.*
 /config.status
 /config-temp
+/tools/virtiofsd/50-qemu-virtiofsd.json
 /elf2dmp
 /trace-events-all
 /trace/generated-events.h

Makefile

@@ -329,6 +329,7 @@ endif
 
 ifdef CONFIG_LINUX
 HELPERS-y += virtiofsd$(EXESUF)
+vhost-user-json-y += tools/virtiofsd/50-qemu-virtiofsd.json
 endif
 
 # Sphinx does not allow building manuals into the same directory as

tools/virtiofsd/50-qemu-virtiofsd.json.in

+{
+  "description": "QEMU virtiofsd vhost-user-fs",
+  "type": "fs",
+  "binary": "@libexecdir@/virtiofsd"
+}