add wrapper that immitates Xvfb using weston + Xwayland (#4450)

fs/libexec/xpra/xpra_weston_xvfb

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+unset DISPLAY
+export WAYLAND_DISPLAY=headless-$$
+weston --backend=headless-backend.so --socket=$WAYLAND_DISPLAY &
+Xwayland -noreset $@

setup.py

@@ -1787,6 +1787,9 @@ def add_service_exe(script, icon, base_name):
             libexec_scripts += ["xdg-open", "gnome-open", "gvfs-open"]
         if server_ENABLED:
             libexec_scripts.append("auth_dialog")
+    if x11_ENABLED:
+        libexec_scripts.append("xpra_weston_xvfb")
+
     def add_data_files(target_dir, files):
         assert isinstance(target_dir, str)
         assert isinstance(files, (list, tuple))
@@ -1796,7 +1799,7 @@ def add_data_files(target_dir, files):
         libexec_dir = "__LIBEXECDIR__"
     else:
         libexec_dir = "libexec"
-    add_data_files(libexec_dir+"/xpra/", [f"fs/libexec/xpra/{x}" for x in libexec_scripts])
+
     if data_ENABLED:
         man_path = "share/man"
         icons_dir = "icons"
@@ -1967,6 +1970,9 @@ def addconf(name, dst_name=None):
                 for etc_dir in ("http-headers", "content-type", "content-categories", "content-parent"):
                     dirtodir(f"fs/etc/xpra/{etc_dir}", f"/etc/xpra/{etc_dir}")
 
+            for libexec_script in libexec_scripts:
+                copytodir(f"fs/libexec/xpra/{libexec_script}", libexec_dir+"/xpra/", chmod=0o755)
+
     # add build_conf to build step
     cmdclass.update({
              'build'        : build_override,

xpra/scripts/config.py

@@ -161,6 +161,12 @@ def detect_xvfb_command(conf_dir:str="/etc/xpra/", bin_dir:str="",
 
     if Xdummy_ENABLED is None:
         debug("Xdummy support unspecified, will try to detect")
+        # RHEL 10 needs to use `xpra_weston_xvfb` instead of Xorg:
+        if os.path.exists("/etc/redhat-release"):
+            with open("/etc/redhat-release") as f:
+                relinfo = f.read()
+            if relinfo.find("release 10") >= 0:
+                return ["/usr/libexec/xpra/xpra_weston_xvfb"]
     return detect_xdummy_command(conf_dir, bin_dir, Xdummy_wrapper_ENABLED, warn_fn)
 
 def detect_xdummy_command(conf_dir:str="/etc/xpra/", bin_dir:str="",