Detect the presence of PolKit on configuration

When no PolKit is installed, the program gets built without support
for it. This can be overriden by specifying -DENABLE_POLKIT=ON on
the cmake command line.

2 files changed, 25 insertions, 0 deletions

diff --git a/src/input/CMakeLists.txt b/src/input/CMakeLists.txt
index fcb5ff5..44cf6b6 100644
--- a/src/input/CMakeLists.txt
+++ b/src/input/CMakeLists.txt
@@ -57,6 +57,27 @@ if(UNIX)
         x11FakeMouseHandler.cpp
         privilegedHandlerForwarder.cpp
     )
+
+    # we need pkg-config to find out where to install the action file:
+    find_package(PkgConfig)
+    if(NOT PKG_CONFIG_FOUND)
+        # we will try to make a best effort and put our policy file into
+        # ${PREFIX}/share/polkit-1, but only if we can find
+        # the pkexec executable.
+        find_program(PKEXEC_LOCATION pkexec)
+        if(PKEXEC_LOCATION OR ENABLE_POLKIT)
+            set(POLKIT_FOUND ON)
+        endif()
+    else()
+        pkg_check_modules(POLKIT "polkit-gobject-1")
+    endif()
+    
+    # now, arrange for policykit integration:
+    if(POLKIT_FOUND OR ENABLE_POLKIT)
+        set_property(SOURCE ${pvsprivinputd_SRCS}
+            APPEND
+            PROPERTY COMPILE_DEFINITIONS HAVE_POLKIT)
+    endif()
 endif()
 
 add_library(
diff --git a/src/input/pvsCheckPrivileges.cpp b/src/input/pvsCheckPrivileges.cpp
index 57b5d8b..f9a8851 100644
--- a/src/input/pvsCheckPrivileges.cpp
+++ b/src/input/pvsCheckPrivileges.cpp
@@ -211,6 +211,7 @@ PVSCheckPrivileges::UserPrivilege PVSCheckPrivileges::getUserPrivilege(CachedInp
 	}
 
 	// User is not trivially privileged, so try to check with PolicyKit.
+#ifdef HAVE_POLKIT // but only if it is present
 	// For PolKit, we need the start-time of the process.
 	// On Linux, we can get it from /proc:
 	QString procStat = QString("/proc/%1/stat").arg(sender.pid);
@@ -257,6 +258,9 @@ PVSCheckPrivileges::UserPrivilege PVSCheckPrivileges::getUserPrivilege(CachedInp
 		return USER_LOOKUP_FAILURE;
 	}
 	return reply.value().isAuthorized ? USER_PRIVILEGED : USER_UNPRIVILEGED;
+#else
+	return USER_UNPRIVILEGED;
+#endif
 }
 
 QString PVSCheckPrivileges::getX11SessionName(CachedInputContext const& sender)