From 20ca676e632eb0ee5a8dd0cb7cb8a9216852533f Mon Sep 17 00:00:00 2001
From: Ulrich Mohr <mohr@irs.uni-stuttgart.de>
Date: Tue, 6 May 2025 11:34:32 +0200
Subject: [PATCH] git version at startup

---
 common/CMakeLists.txt                |  4 +++-
 common/git_version/CMakeLists.txt    | 17 +++++++++++++++++
 common/git_version/get_version.cmake |  3 +++
 common/git_version/git_version.h.in  |  4 ++++
 mission/mission.c                    | 13 +++++++++++++
 5 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 common/git_version/CMakeLists.txt
 create mode 100644 common/git_version/get_version.cmake
 create mode 100644 common/git_version/git_version.h.in

diff --git a/common/CMakeLists.txt b/common/CMakeLists.txt
index ca7b46a..06a623e 100644
--- a/common/CMakeLists.txt
+++ b/common/CMakeLists.txt
@@ -1,2 +1,4 @@
 # TODO directly referencing bsp is not correct
-target_include_directories(bsp PUBLIC include)
\ No newline at end of file
+target_include_directories(bsp PUBLIC include)
+
+add_subdirectory(git_version)
\ No newline at end of file
diff --git a/common/git_version/CMakeLists.txt b/common/git_version/CMakeLists.txt
new file mode 100644
index 0000000..4d5bee1
--- /dev/null
+++ b/common/git_version/CMakeLists.txt
@@ -0,0 +1,17 @@
+find_package(Git)
+if(Git_FOUND)
+  message("Git found: ${GIT_EXECUTABLE}")
+
+  add_custom_target( get_git_version
+    COMMAND ${CMAKE_COMMAND}
+      -D GIT_EXECUTABLE=${GIT_EXECUTABLE}
+      -D INPUT_FILE=${CMAKE_CURRENT_SOURCE_DIR}/git_version.h.in
+      -D OUTPUT_FILE=${CMAKE_CURRENT_BINARY_DIR}/git_version.h
+      -P ${CMAKE_CURRENT_SOURCE_DIR}/get_version.cmake
+  )
+
+  add_dependencies(${OBSW_NAME} get_git_version)
+  target_include_directories(${OBSW_NAME} PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
+else()
+  message( FATAL_ERROR "Building outside of git is not supported yet")
+endif()
\ No newline at end of file
diff --git a/common/git_version/get_version.cmake b/common/git_version/get_version.cmake
new file mode 100644
index 0000000..f8e96db
--- /dev/null
+++ b/common/git_version/get_version.cmake
@@ -0,0 +1,3 @@
+execute_process(COMMAND ${GIT_EXECUTABLE} describe --tags --dirty OUTPUT_VARIABLE GIT_VERSION_STRING OUTPUT_STRIP_TRAILING_WHITESPACE)
+string(TIMESTAMP BUILD_TIME_STRING UTC)
+configure_file(${INPUT_FILE} ${OUTPUT_FILE})
\ No newline at end of file
diff --git a/common/git_version/git_version.h.in b/common/git_version/git_version.h.in
new file mode 100644
index 0000000..f0dbf83
--- /dev/null
+++ b/common/git_version/git_version.h.in
@@ -0,0 +1,4 @@
+#pragma once
+
+#cmakedefine GIT_VERSION_STRING "@GIT_VERSION_STRING@"
+#cmakedefine BUILD_TIME_STRING "@BUILD_TIME_STRING@"
\ No newline at end of file
diff --git a/mission/mission.c b/mission/mission.c
index 2deb2f9..0354a2d 100644
--- a/mission/mission.c
+++ b/mission/mission.c
@@ -10,6 +10,8 @@
 #include <hardware/interfaces.h>
 #include <unistd.h>
 
+#include <git_version.h>
+
 
 void rust_main();
 
@@ -41,12 +43,23 @@ void test_hardware() {
 // to be implemented by bsp (do not return from it!)
 void done();
 
+
 void init_task(void* _) {
   rust_main(_);
 }
 
+#define STARTUP_MESSAGE1 "\nROMEO embedded obsw\nRelease:    "
+#define STARTUP_MESSAGE2 "\nBuild time: "
+
+
 void mission(void) {
 
+  write(1, STARTUP_MESSAGE1, strlen(STARTUP_MESSAGE1));
+  write(1, GIT_VERSION_STRING, strlen(GIT_VERSION_STRING));
+  write(1, STARTUP_MESSAGE2, strlen(STARTUP_MESSAGE2));
+  write(1, BUILD_TIME_STRING, strlen(BUILD_TIME_STRING));
+  write(1, "\n", 1);
+
   
   test_hardware();