Include config layer to override kit config simply.

The config is read once during the forkit startup. Add a read-only
user configuration layer, and also disable config writing: no
writable user config.

Makefile.am

@@ -14,14 +14,18 @@ loolwsddata_DATA = discovery.xml \
 
 loolwsdconfigdir = @LOOLWSD_CONFIGDIR@
 
-loolwsdconfig_DATA = loolwsd.xml
+loolwsdconfig_DATA = loolwsd.xml \
+		     loolkitconfig.xcu
 
 ACLOCAL_AMFLAGS = -I m4
 
 # quick and easy for now.
 include_paths = -I${top_srcdir}/common -I${top_srcdir}/net -I${top_srcdir}/wsd -I${top_srcdir}/kit
 
-AM_CPPFLAGS = -pthread -DLOOLWSD_DATADIR='"@LOOLWSD_DATADIR@"' -DLOOLWSD_CONFIGDIR='"@LOOLWSD_CONFIGDIR@"' ${include_paths}
+AM_CPPFLAGS = -pthread -DLOOLWSD_DATADIR='"@LOOLWSD_DATADIR@"' \
+	      -DLOOLWSD_CONFIGDIR='"@LOOLWSD_CONFIGDIR@"' \
+	      -DDEBUG_ABSSRCDIR='"@abs_srcdir@"' \
+	      ${include_paths}
 AM_LDFLAGS = -pthread -Wl,-E
 loolforkit_LDFLAGS = -pthread -Wl,-E,-rpath,/snap/loolwsd/current/usr/lib
 loolforkit_nocaps_LDFLAGS = -pthread -Wl,-E,-rpath,/snap/loolwsd/current/usr/lib

kit/ForKit.cpp

@@ -438,13 +438,27 @@ int main(int argc, char** argv)
         return Application::EXIT_USAGE;
     }
 
-    if (!std::getenv("LD_BIND_NOW"))
+    // Setup & check environment
+    std::string layers(
+        "xcsxcu:${BRAND_BASE_DIR}/share/registry "
+        "res:${BRAND_BASE_DIR}/share/registry "
+        "bundledext:${${BRAND_BASE_DIR}/program/lounorc:BUNDLED_EXTENSIONS_USER}/registry/com.sun.star.comp.deployment.configuration.PackageRegistryBackend/configmgr.ini "
+        "sharedext:${${BRAND_BASE_DIR}/program/lounorc:SHARED_EXTENSIONS_USER}/registry/com.sun.star.comp.deployment.configuration.PackageRegistryBackend/configmgr.ini "
+        "userext:${${BRAND_BASE_DIR}/program/lounorc:UNO_USER_PACKAGES_CACHE}/registry/com.sun.star.comp.deployment.configuration.PackageRegistryBackend/configmgr.ini "
+#if ENABLE_DEBUG // '*' denotes non-writable.
+        "user:*file://" DEBUG_ABSSRCDIR "/loolkitconfig.xcu "
+#else
+        "user:*file://" LOOLWSD_CONFIGDIR "/loolkitconfig.xcu "
+#endif
+        );
+    ::setenv("CONFIGURATION_LAYERS", layers.c_str(),
+             1 /* override */);
+
+    if (!std::getenv("LD_BIND_NOW")) // must be set by parent.
         LOG_INF("Note: LD_BIND_NOW is not set.");
 
     if (!NoCapsForKit && !haveCorrectCapabilities())
-    {
         return Application::EXIT_SOFTWARE;
-    }
 
     // Initialize LoKit
     if (!globalPreinit(loTemplate))

loolkitconfig.xcu

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<oor:items xmlns:oor="http://openoffice.org/2001/registry" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+
+</oor:items>

loolwsd.spec.in

@@ -110,6 +110,7 @@ echo "0 0 */1 * * root find /var/cache/loolwsd -name \"*.png\" -a -atime +10 -ex
 
 %config(noreplace) /etc/cron.d/loolwsd.cron
 %config(noreplace) /etc/loolwsd/loolwsd.xml
+%config /etc/loolwsd/loolkitconfig.xcu
 
 %doc README