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function(get_git_commit_hash)
get_filename_component(GIT_DESCRIBE_CMAKE_DIR ${CMAKE_CURRENT_LIST_FILE} PATH)
get_filename_component(GIT_ROOT ${GIT_DESCRIBE_CMAKE_DIR} PATH)
set(GIT_DIR "${GIT_ROOT}/.git")
# Add a CMake configure dependency to the currently checked out revision.
set(GIT_DEPENDS ${GIT_DIR}/HEAD)
file(READ ${GIT_DIR}/HEAD HEAD_REF)
if(HEAD_REF MATCHES "ref: (.+)\n")
set(HEAD_REF ${CMAKE_MATCH_1})
if(EXISTS "${GIT_DIR}/${HEAD_REF}")
list(APPEND GIT_DEPENDS ${GIT_DIR}/${HEAD_REF})
file(READ ${GIT_DIR}/${HEAD_REF} HEAD_REF)
elseif(EXISTS "${GIT_DIR}/packed-refs")
list(APPEND GIT_DEPENDS ${GIT_DIR}/packed-refs)
file(READ "${GIT_DIR}/packed-refs" PACKED_REFS)
if(${PACKED_REFS} MATCHES "([0-9a-z]*) ${HEAD_REF}")
set(HEAD_REF ${CMAKE_MATCH_1})
else()
set(HEAD_REF "")
endif()
else()
set(HEAD_REF "")
endif()
endif()
set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${GIT_DEPENDS})
string(STRIP ${HEAD_REF} HEAD_REF)
if(HEAD_REF STREQUAL "")
message(WARNING "Cannot determine git HEAD")
else()
set(GIT_COMMIT_HASH ${HEAD_REF} PARENT_SCOPE)
endif()
endfunction()
get_git_commit_hash()
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