Solvespace

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