macos: fix Mach rendezvous by injecting CFBundleIdentifier + CFProcessPath

CEF 130+ forms the MachPortRendezvousServer bootstrap service name as
  BaseBundleID() + ".MachPortRendezvousServer." + pid
When the process has no app bundle (bare Python script), BaseBundleID()
returns "" and the service name starts with "." — an invalid form that
bootstrap_register rejects, causing all renderer subprocesses to crash
at startup with "Unknown service name" (1102).

Fix 1 (util_mac.mm): In MacInitialize() — which runs before
CefInitialize() — inject CFBundleIdentifier="org.cefpython" into the
main bundle's info dictionary when none exists.  This gives BaseBundleID()
a valid reverse-DNS prefix so the rendezvous server can register.

Fix 2 (ci-macos.yml): Also create a minimal fake app bundle and set
CFProcessPath before launching Python, so CFBundleGetMainBundle() picks up
the bundle identifier at CoreFoundation init time (belt-and-suspenders for
the CI runner's early initialization order).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: linesight

.github/workflows/ci-macos.yml

@@ -121,7 +121,33 @@ jobs:
 
       - name: Run unit tests
         run: |
-          PYTHONPATH="${{ github.workspace }}" python unittests/_test_runner.py
+          # Create a minimal app bundle so Python has a CFBundleIdentifier.
+          # CEF 130+ forms the MachPortRendezvousServer bootstrap service name
+          # as BaseBundleID()+".MachPortRendezvousServer."+pid.  Without a
+          # bundle ID the name starts with "." which bootstrap_register rejects,
+          # causing renderer subprocesses to crash.  Setting CFProcessPath
+          # before Python starts makes CFBundleGetMainBundle() return this
+          # bundle, giving BaseBundleID() a valid value before CefInitialize().
+          BUNDLE_DIR="${{ github.workspace }}/CEFPython.app"
+          mkdir -p "$BUNDLE_DIR/Contents/MacOS"
+          ln -sf "$(which python)" "$BUNDLE_DIR/Contents/MacOS/python"
+          cat > "$BUNDLE_DIR/Contents/Info.plist" << 'PLIST'
+          <?xml version="1.0" encoding="UTF-8"?>
+          <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+          <plist version="1.0">
+          <dict>
+            <key>CFBundleIdentifier</key>
+            <string>org.cefpython</string>
+            <key>CFBundleName</key>
+            <string>CEFPython</string>
+            <key>CFBundleExecutable</key>
+            <string>python</string>
+          </dict>
+          </plist>
+          PLIST
+          PYTHONPATH="${{ github.workspace }}" \
+          CFProcessPath="$BUNDLE_DIR/Contents/MacOS/python" \
+            python unittests/_test_runner.py
 
   wheel:
     needs: test

src/client_handler/util_mac.mm

@@ -77,6 +77,30 @@ void MacInitialize() {
     // OFF: it's causing a crash during shutdown release
     // g_autopool = [[NSAutoreleasePool alloc] init];
     [NSApplication sharedApplication];
+
+    // CEF 130+ builds the MachPortRendezvousServer bootstrap service name as
+    //   BaseBundleID() + ".MachPortRendezvousServer." + pid
+    // When the process has no app bundle (e.g. a bare Python script),
+    // BaseBundleID() returns "" and the name starts with ".", which
+    // bootstrap_register rejects as invalid.  All renderer subprocesses then
+    // crash with "Unknown service name" (1102) on bootstrap_look_up.
+    // Inject a synthetic CFBundleIdentifier before CefInitialize() so the
+    // service name becomes a valid reverse-DNS label ("org.cefpython...").
+    CFBundleRef mainBundle = CFBundleGetMainBundle();
+    if (mainBundle) {
+        CFStringRef bundleID = CFBundleGetIdentifier(mainBundle);
+        if (!bundleID || CFStringGetLength(bundleID) == 0) {
+            // CFBundleGetInfoDictionary returns the bundle's internal mutable
+            // dictionary; casting to CFMutableDictionaryRef is safe here.
+            CFMutableDictionaryRef infoDict =
+                (CFMutableDictionaryRef)CFBundleGetInfoDictionary(mainBundle);
+            if (infoDict) {
+                CFDictionarySetValue(infoDict,
+                                     CFSTR("CFBundleIdentifier"),
+                                     CFSTR("org.cefpython"));
+            }
+        }
+    }
 }
 
 void MacShutdown() {