1 files changed, 40 insertions, 0 deletions
diff --git a/cmake/utils/GetGitHash.cmake b/cmake/utils/GetGitHash.cmake
new file mode 100644
index 00000000..e399216d
--- /dev/null
+++ b/cmake/utils/GetGitHash.cmake
@@ -0,0 +1,40 @@
+function(get_git_hash WORKING_DIR VERSION_MAJ VERSION_MIN VERSION_PAT OUTPUT_VAR)
+  execute_process(
+    COMMAND git describe --tags --always --dirty
+      --match "[0-9]*.[0-9]*.[0-9]*"
+    WORKING_DIRECTORY ${WORKING_DIR}
+    OUTPUT_VARIABLE _hash
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    ERROR_QUIET
+  )
+
+  if(_hash MATCHES "^[0-9]+\\.[0-9]+\\.[0-9]+")
+    # git describe returned a tag-based version string
+  elseif(_hash)
+    # No version tag found, construct full version string
+    execute_process(
+      COMMAND git rev-list --count HEAD
+      WORKING_DIRECTORY ${WORKING_DIR}
+      OUTPUT_VARIABLE _count
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+      ERROR_QUIET
+    )
+    execute_process(
+      COMMAND git describe --always --dirty
+      WORKING_DIRECTORY ${WORKING_DIR}
+      OUTPUT_VARIABLE _desc
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+      ERROR_QUIET
+    )
+    set(_hash
+      "${VERSION_MAJ}.${VERSION_MIN}.${VERSION_PAT}-${_count}-g${_desc}")
+  elseif(EXISTS "${WORKING_DIR}/VERSION")
+    # No git, use VERSION file (git archive / cgit snapshot)
+    file(READ "${WORKING_DIR}/VERSION" _hash)
+    string(STRIP "${_hash}" _hash)
+  else()
+    set(_hash "${VERSION_MAJ}.${VERSION_MIN}.${VERSION_PAT}")
+  endif()
+
+  set(${OUTPUT_VAR} "${_hash}" PARENT_SCOPE)
+endfunction()