70 lines
2.4 KiB
CMake
70 lines
2.4 KiB
CMake
find_package(Git)
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function(git_version_number)
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cmake_parse_arguments(GVN "" "GIT_DIR;HASH;SHORT_HASH;TAG_RELATIVE" "" ${ARGN})
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if(NOT Git_FOUND)
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message(ERROR "git_version_number did not find Git")
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endif()
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# Use specified GIT_DIR, or default to .git in current source directory
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if(DEFINED GVN_GIT_DIR)
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set(GIT_DIR "${GVN_GIT_DIR}")
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else()
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set(GIT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/.git")
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endif()
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set(BASE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/GitVersionNumber")
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file(READ "${GIT_DIR}/HEAD" HEAD_TEXT)
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# Determine which file holds the current hash; we'll then track the contents
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# of this file as well as HEAD with a build-time dependency.
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if("${HEAD_TEXT}" MATCHES "^ref: ")
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# HEAD tied to a ref: follow the ref file
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string(REPLACE "ref:" "" HEAD_TEXT "${HEAD_TEXT}")
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string(STRIP "${HEAD_TEXT}" HEAD_TEXT)
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set(GIT_TRACKED_FILE "${GIT_DIR}/${HEAD_TEXT}")
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else()
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# Detached HEAD: follow .git/HEAD
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set(GIT_TRACKED_FILE "${GIT_DIR}/HEAD")
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endif()
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# Create a configure-time dependency on .git/HEAD so that whenever it changes
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# (current branch changes or detached HEAD moves), CMake is re-run to update
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# the file to track if needed.
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configure_file("${GIT_DIR}/HEAD" "${BASE}_HEAD" COPYONLY)
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# Create a configure-time dependency on GIT_TRACKED_FILE so that whenever it
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# changes (current branch moves), this script is re-run to provide new values
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# to the caller (which will likely need them at configure time for
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# configure_file() calls of their own.)
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configure_file("${GIT_TRACKED_FILE}" "${BASE}_HASH" COPYONLY)
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# Extract version hash
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execute_process(
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COMMAND cat "${GIT_TRACKED_FILE}"
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OUTPUT_VARIABLE HASH_VALUE
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OUTPUT_STRIP_TRAILING_WHITESPACE
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WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}")
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if(DEFINED GVN_HASH)
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set("${GVN_HASH}" "${HASH_VALUE}" PARENT_SCOPE)
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endif()
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# Short version hash
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if(DEFINED GVN_SHORT_HASH)
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string(SUBSTRING "${HASH_VALUE}" 0 7 SHORT_HASH_VALUE)
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set("${GVN_SHORT_HASH}" "${SHORT_HASH_VALUE}" PARENT_SCOPE)
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endif()
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# Version from tag
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if(DEFINED GVN_TAG_RELATIVE)
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execute_process(
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COMMAND ${GIT_EXECUTABLE} describe --tag --always "${HASH_VALUE}"
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COMMAND cut -d- -f1-2
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OUTPUT_VARIABLE TAG_VALUE
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OUTPUT_STRIP_TRAILING_WHITESPACE
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WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}")
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set("${GVN_TAG_RELATIVE}" "${TAG_VALUE}" PARENT_SCOPE)
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endif()
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endfunction()
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