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if (GIT_EXECUTABLE)
# refresh git index
execute_process(COMMAND ${GIT_EXECUTABLE} update-index -q --refresh
WORKING_DIRECTORY ${TOP_SOURCE_DIR} TIMEOUT 5 OUTPUT_QUIET
ERROR_VARIABLE EXEC_ERR OUTPUT_STRIP_TRAILING_WHITESPACE
)
#later use git describe here
execute_process( COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
WORKING_DIRECTORY ${TOP_SOURCE_DIR}
OUTPUT_VARIABLE VOTCA_GIT_ID OUTPUT_STRIP_TRAILING_WHITESPACE)
execute_process( COMMAND ${GIT_EXECUTABLE} diff-index --name-only HEAD
WORKING_DIRECTORY ${TOP_SOURCE_DIR}
OUTPUT_VARIABLE _HAS_CHANGES OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
if (NOT "${_HAS_CHANGES}" STREQUAL "")
set(VOTCA_GIT_ID "${VOTCA_GIT_ID} (dirty)")
endif()
message("Current git revision is ${VOTCA_GIT_ID}")
set(VOTCA_GIT_ID "gitid: ${VOTCA_GIT_ID}")
else()
set (VOTCA_GIT_ID)
endif()
set (GIT_HEADER "gitversion.h")
set (NEW_GIT_HEADER "new_gitversion.h")
file(WRITE ${NEW_GIT_HEADER} "static const std::string gitversion = \"${VOTCA_GIT_ID}\";\n")
execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different ${NEW_GIT_HEADER} ${GIT_HEADER})
execute_process(COMMAND ${CMAKE_COMMAND} -E remove ${NEW_GIT_HEADER})
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