Added script to warn a user about issues regarding wrong umask and CPack

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

CMakeLists.txt

@@ -200,6 +200,14 @@ add_executable(nDPId nDPId.c ${NDPID_PFRING_SRCS} nio.c utils.c)
 add_executable(nDPIsrvd nDPIsrvd.c nio.c utils.c)
 add_executable(nDPId-test nDPId-test.c ${NDPID_PFRING_SRCS})
 
+add_custom_target(umask_check)
+add_custom_command(
+    TARGET umask_check
+    PRE_BUILD
+    COMMAND ${CMAKE_SOURCE_DIR}/scripts/umask-check.sh
+)
+add_dependencies(nDPId umask_check)
+
 add_custom_target(dist)
 add_custom_command(
     TARGET dist

scripts/umask-check.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+UMASK=$(umask)
+
+if [ "${UMASK}" != "0002" -a "${UMASK}" != "0022" ]; then
+    cat <<EOF
+********************************************
+* WARNING: 'cpack -G DEB' / 'cpack -G RPM' *
+* might not work correctly due to umask,   *
+* which is set to ${UMASK}                     *
+* but expected is either 0002 or 0022      *
+********************************************
+EOF
+fi