Merge pull request ceph#54963 from DimStar77/cmake328

cmake: Ensure git exists before executing it

Signed-off-by: Kefu Chai <[email protected]>

cmake/modules/CTags.cmake

@@ -3,13 +3,14 @@ find_program(CTAGS_EXECUTABLE ctags)
 function(add_tags name)
   cmake_parse_arguments(TAGS "" "SRC_DIR;TAG_FILE" "EXCLUDE_OPTS;EXCLUDES" ${ARGN})
   set(excludes ${TAGS_EXCLUDES})
+  find_package(Git)
   if(TAGS_EXCLUDE_OPTS)
     # always respect EXCLUDES_OPTS
     list(APPEND excludes ${TAGS_EXCLUDE_OPTS})
-  else()
+  elseif(Git_FOUND)
     # exclude the submodules under SRC_DIR by default
     execute_process(
-      COMMAND git config --file .gitmodules --get-regexp path
+      COMMAND ${GIT_EXECUTABLE} config --file .gitmodules --get-regexp path
       COMMAND awk "/${TAGS_SRC_DIR}/ { print $2 }"
       WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
       RESULT_VARIABLE result_code