rbutil: Create git version information at build time.

Change-Id: Iaf701f4d64d6852423f6a28a753b27abc43477e2

4 files changed, 79 insertions, 3 deletions

diff --git a/utils/CMakeLists.txt b/utils/CMakeLists.txt
index cb0e683d75..55e2a60407 100644
--- a/utils/CMakeLists.txt
+++ b/utils/CMakeLists.txt
@@ -333,5 +333,21 @@ add_library(rbtomcrypt
     )
 target_include_directories(rbtomcrypt PUBLIC ${CMAKE_CURRENT_LIST_DIR}/tomcrypt/src/headers)
 
+
+# target will always be build. File is only updated when contents change.
+add_custom_target(gitversion.h
+    COMMENT "Updating gitversion.h"
+    COMMAND ${CMAKE_COMMAND}
+            -DOUTFILE=${CMAKE_CURRENT_BINARY_DIR}/gitversion/gitversion.h
+            -P ${CMAKE_CURRENT_LIST_DIR}/cmake/gitversion.cmake
+    BYPRODUCTS ${CMAKE_CURRENT_BINARY_DIR}/gitversion/gitversion.h)
+
+# link to get git version header.
+add_library(gitversion INTERFACE
+    ${CMAKE_CURRENT_BINARY_DIR}/gitversion/gitversion.h)
+
+add_dependencies(gitversion gitversion.h)
+target_include_directories(gitversion INTERFACE ${CMAKE_CURRENT_BINARY_DIR}/gitversion)
+
 include(${CMAKE_CURRENT_LIST_DIR}/cmake/deploy.cmake)
 add_subdirectory(rbutilqt)
diff --git a/utils/cmake/gitversion.cmake b/utils/cmake/gitversion.cmake
new file mode 100644
index 0000000000..b13dfc0a0f
--- /dev/null
+++ b/utils/cmake/gitversion.cmake
@@ -0,0 +1,58 @@
+#
+#             __________               __   ___.
+#   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+#   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+#   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+#   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+#                     \/            \/     \/    \/            \/
+#
+# All files in this archive are subject to the GNU General Public License.
+# See the file COPYING in the source tree root for full license agreement.
+#
+# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+# KIND, either express or implied.
+#
+
+find_package(Git QUIET)
+
+execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse --verify --short=10 HEAD
+                OUTPUT_VARIABLE GIT_HASH
+                ERROR_QUIET)
+
+# Check whether we got any revision (which isn't
+# always the case, e.g. when someone downloaded a zip
+# file from Github instead of a checkout)
+if ("${GIT_HASH}" STREQUAL "")
+    set(GIT_HASH "N/A")
+else()
+    execute_process(
+        COMMAND git diff --quiet --exit-code
+        RESULT_VARIABLE GIT_DIFF_EXITCODE)
+
+    string(STRIP "${GIT_HASH}" GIT_HASH)
+    if (${GIT_DIFF_EXITCODE})
+        set(GIT_DIFF "M")
+    endif()
+endif()
+
+string(TIMESTAMP TODAY "%y%m%d")
+set(VERSION "
+#ifndef GITVERSION
+#define GITVERSION \"${GIT_HASH}${GIT_DIFF}-${TODAY}\"
+#define GITHASH \"${GIT_HASH}${GIT_DIFF}\"
+#define BUILDDATE \"${TODAY}\"
+#endif
+")
+
+if(EXISTS ${OUTFILE})
+    file(READ "${OUTFILE}" _version)
+else()
+    set(_version "")
+endif()
+
+if (NOT "${VERSION}" STREQUAL "${_version}")
+    file(WRITE "${OUTFILE}" "${VERSION}")
+endif()
+
+message("-- Revision: ${GIT_HASH}${GIT_DIFF}")
+
diff --git a/utils/rbutilqt/CMakeLists.txt b/utils/rbutilqt/CMakeLists.txt
index 138d0903cf..da453c3d11 100644
--- a/utils/rbutilqt/CMakeLists.txt
+++ b/utils/rbutilqt/CMakeLists.txt
@@ -122,7 +122,7 @@ if(APPLE)
         PROPERTIES MACOSX_PACKAGE_LOCATION Resources)
 endif()
 
-target_link_libraries(RockboxUtility rbbase cutelogger
+target_link_libraries(RockboxUtility rbbase cutelogger gitversion
     Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::Multimedia)
 
 target_include_directories(RockboxUtility PRIVATE
diff --git a/utils/rbutilqt/version.h b/utils/rbutilqt/version.h
index b2d24d369b..1a1d78f643 100644
--- a/utils/rbutilqt/version.h
+++ b/utils/rbutilqt/version.h
@@ -18,6 +18,8 @@
  *
  ****************************************************************************/
 
+#include "gitversion.h"
+
 // PUREVERSION is needed to be able to just compare versions. It does not
 // contain a build timestamp because it needs to be the same in different
 // files
@@ -38,7 +40,7 @@
 #define VERSIONSTRING(a, b, c) STR(a) "." STR(b) "." STR(c)
 #define VERSION VERSIONSTRING(VERSION_MAJOR, VERSION_MINOR, VERSION_MICRO) BUILDID
 // PUREVERSION should identify the build uniquely. Use version string for now.
-#define PUREVERSION "$Rev$"
+#define PUREVERSION GITHASH
 
-#define FULLVERSION VERSION " (" PUREVERSION "), built " __DATE__ " " __TIME__
+#define FULLVERSION VERSION " (" GITHASH "), built " __DATE__ " " __TIME__