From 08b21339ec3c53e2c738df81899c79746e35b21b Mon Sep 17 00:00:00 2001
From: Braulio Valdivielso <brlvldvlsmrtnz@gmail.com>
Date: Mon, 23 Aug 2021 23:06:04 +0100
Subject: [PATCH] print out git status information at configure stage

This fixes #24373. Having the git status information available in the
CMake logs will make it easier to troubleshoot build failure reports.
---
 CMakeLists.txt         |  1 +
 cmake/git_status.cmake | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 cmake/git_status.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1aef8c9fc8d..8a5a6293f7c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,6 +45,7 @@ include (cmake/arch.cmake)
 include (cmake/target.cmake)
 include (cmake/tools.cmake)
 include (cmake/analysis.cmake)
+include (cmake/git_status.cmake)
 
 # Ignore export() since we don't use it,
 # but it gets broken with a global targets via link_libraries()
diff --git a/cmake/git_status.cmake b/cmake/git_status.cmake
new file mode 100644
index 00000000000..8748aacfedd
--- /dev/null
+++ b/cmake/git_status.cmake
@@ -0,0 +1,17 @@
+# Print the status of the git repository (if git is available).
+# This is useful for troubleshooting build failure reports
+find_package(Git)
+
+if (Git_FOUND)
+  execute_process(
+    COMMAND ${GIT_EXECUTABLE} rev-parse HEAD
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    OUTPUT_VARIABLE GIT_COMMIT_ID
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+  message(STATUS "HEAD's commit hash ${GIT_COMMIT_ID}")
+  execute_process(
+    COMMAND ${GIT_EXECUTABLE} status
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR})
+else()
+  message(STATUS "The git program could not be found.")
+endif()