CPackRPM: Drop explicit handling of '@' symbols that breaks them (#14782)

The change in commit v2.8.12~218^2 (CPackRPM protect '@' character in
filename processed in the spec file, 2013-07-05) was not necessary after
commit v2.8.12~439^2 (Add support for componentized USER spec file,
2013-04-01).  The latter replaced ${VAR} references in the spec file
template string with \@VAR\@ references, thus protecting '@' symbols
automatically.  This caused CPackRPM to break paths with @ symbols.
Revert the change to fix the behavior, and add a test case.

Modules/CPackRPM.cmake

@@ -1175,13 +1175,6 @@ if(CPACK_RPM_PACKAGE_DEBUG)
    message("CPackRPM:Debug: CPACK_TEMPORARY_PACKAGE_FILE_NAME = ${CPACK_TEMPORARY_PACKAGE_FILE_NAME}")
 endif()
 
-# protect @ in pathname in order to avoid their
-# interpretation during the configure_file step
-set(CPACK_RPM_INSTALL_FILES_LIST "${CPACK_RPM_INSTALL_FILES}")
-set(PROTECTED_AT "@")
-string(REPLACE "@" "\@PROTECTED_AT\@" CPACK_RPM_INSTALL_FILES "${CPACK_RPM_INSTALL_FILES_LIST}")
-set(CPACK_RPM_INSTALL_FILES_LIST "")
-
 #
 # USER generated/provided spec file handling.
 #
@@ -1292,9 +1285,6 @@ else()
   configure_file(${CPACK_RPM_BINARY_SPECFILE}.in ${CPACK_RPM_BINARY_SPECFILE} @ONLY)
 endif()
 
-# remove AT protection
-unset(PROTECTED_AT)
-
 if(RPMBUILD_EXECUTABLE)
   # Now call rpmbuild using the SPECFILE
   execute_process(

Tests/CPackComponentsForAll/CMakeLists.txt

@@ -43,7 +43,7 @@ install(TARGETS mylibapp
 # CPACK_MONOLITHIC_INSTALL=1 is set (at cmake time).
 install(TARGETS mylibapp2
   RUNTIME
-  DESTINATION bin)
+  DESTINATION bin/@in@_@path@@with\\@and\\@/\@in_path\@) # test @ char in path
 
 install(FILES mylib.h
   DESTINATION include

Tests/CPackComponentsForAll/RunCPackVerifyResult.cmake

@@ -139,6 +139,7 @@ if(CPackGen MATCHES "RPM")
   set(CPACK_COMPONENT_HEADERS_DESCRIPTION
     "C/C\\+\\+ header files for use with MyLib")
 
+  # test package info
   if(${CPackComponentWay} STREQUAL "IgnoreGroup")
     # set gnu install prefixes to what they are set during rpm creation
     # CMAKE_SIZEOF_VOID_P is not set here but lib is prefix of lib64 so
@@ -213,6 +214,29 @@ if(CPackGen MATCHES "RPM")
           message(FATAL_ERROR "error: '${check_file}' Architecture does not match expected value - '${check_file_match_expected_architecture}'; RPM output: '${check_file_content}'; generated spec file: '${spec_file_content}'")
       endif()
     endforeach()
-  elseif(${CPackComponentWay} STREQUAL "IgnoreGroup")
+
+    # test package content
+    foreach(check_file ${expected_file})
+      string(REGEX MATCH ".*Unspecified.*" check_file_Unspecified_match ${check_file})
+
+      if(check_file_Unspecified_match)
+        execute_process(COMMAND ${RPM_EXECUTABLE} -pql ${check_file}
+            OUTPUT_VARIABLE check_file_content
+            ERROR_QUIET
+            OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+        string(REGEX MATCH ".*bin/@in@_@path@@with/@and/@/@in_path@/mylibapp2$" check_at_in_path ${check_file_content})
+
+        if(NOT check_at_in_path)
+          file(GLOB_RECURSE spec_file "${CPackComponentsForAll_BINARY_DIR}/*Unspecified*.spec")
+
+          if(spec_file)
+            file(READ ${spec_file} spec_file_content)
+          endif()
+
+          message(FATAL_ERROR "error: '${check_file}' rpm package path with @ characters is missing or invalid. RPM output: '${check_file_content}'; generated spec file: '${spec_file_content}'")
+        endif()
+      endif()
+    endforeach()
   endif()
 endif()