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cmake: add a helper module to retrieve version from Git tags

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Lephenixnoir 2021-01-22 14:42:05 +01:00
parent 6e24074688
commit 985e86df77
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1 changed files with 69 additions and 0 deletions
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69
fxsdk/cmake/GitVersionNumber.cmake Normal file
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find_package(Git)
function(git_version_number)
cmake_parse_arguments(GVN "" "GIT_DIR;HASH;SHORT_HASH;TAG_RELATIVE" "" ${ARGN})
if(NOT Git_FOUND)
message(ERROR "git_version_number did not find Git")
endif()
# Use specified GIT_DIR, or default to .git in current source directory
if(DEFINED GVN_GIT_DIR)
set(GIT_DIR "${GVN_GIT_DIR}")
else()
set(GIT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/.git")
endif()
set(BASE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/GitVersionNumber")
file(READ "${GIT_DIR}/HEAD" HEAD_TEXT)
# Determine which file holds the current hash; we'll then track the contents
# of this file as well as HEAD with a build-time dependency.
if("${HEAD_TEXT}" MATCHES "^ref: ")
# HEAD tied to a ref: follow the ref file
string(REPLACE "ref:" "" HEAD_TEXT "${HEAD_TEXT}")
string(STRIP "${HEAD_TEXT}" HEAD_TEXT)
set(GIT_TRACKED_FILE "${GIT_DIR}/${HEAD_TEXT}")
else()
# Detached HEAD: follow .git/HEAD
set(GIT_TRACKED_FILE "${GIT_DIR}/HEAD")
endif()
# Create a configure-time dependency on .git/HEAD so that whenever it changes
# (current branch changes or detached HEAD moves), CMake is re-run to update
# the file to track if needed.
configure_file("${GIT_DIR}/HEAD" "${BASE}_HEAD" COPYONLY)
# Create a configure-time dependency on GIT_TRACKED_FILE so that whenever it
# changes (current branch moves), this script is re-run to provide new values
# to the caller (which will likely need them at configure time for
# configure_file() calls of their own.)
configure_file("${GIT_TRACKED_FILE}" "${BASE}_HASH" COPYONLY)
# Extract version hash
execute_process(
COMMAND cat "${GIT_TRACKED_FILE}"
OUTPUT_VARIABLE HASH_VALUE
OUTPUT_STRIP_TRAILING_WHITESPACE
WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}")
if(DEFINED GVN_HASH)
set("${GVN_HASH}" "${HASH_VALUE}" PARENT_SCOPE)
endif()
# Short version hash
if(DEFINED GVN_SHORT_HASH)
string(SUBSTRING "${HASH_VALUE}" 0 7 SHORT_HASH_VALUE)
set("${GVN_SHORT_HASH}" "${SHORT_HASH_VALUE}" PARENT_SCOPE)
endif()
# Version from tag
if(DEFINED GVN_TAG_RELATIVE)
execute_process(
COMMAND ${GIT_EXECUTABLE} describe --tag --always "${HASH_VALUE}"
COMMAND cut -d- -f1-2
OUTPUT_VARIABLE TAG_VALUE
OUTPUT_STRIP_TRAILING_WHITESPACE
WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}")
set("${GVN_TAG_RELATIVE}" "${TAG_VALUE}" PARENT_SCOPE)
endif()
endfunction()