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GetGitCommitHash.cmake

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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")

if(NOT EXISTS ${GIT_DIR})

message(WARNING "Not a git repository")

return()

elseif(NOT IS_DIRECTORY ${GIT_DIR})

# In case we are included as a git submodule.

file(READ ${GIT_DIR} GIT_SUB_DIR)

string(REPLACE "gitdir: " "" GIT_SUB_DIR ${GIT_SUB_DIR})

string(STRIP ${GIT_SUB_DIR} GIT_SUB_DIR)

set(GIT_DIR "${GIT_ROOT}/${GIT_SUB_DIR}")

endif()

# 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()