From 7f55725b43800e3ae7ce48e998350778f7517c6f Mon Sep 17 00:00:00 2001
From: jkoan <jkoan@users.noreply.github.com>
Date: Tue, 9 Jan 2018 19:37:28 +0100
Subject: fix:android:Use date of commit as version code instead of system time
 (#376)

---
 cmake/version.cmake | 66 +++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 52 insertions(+), 14 deletions(-)

diff --git a/cmake/version.cmake b/cmake/version.cmake
index 8f82d9f61..41c654d33 100755
--- a/cmake/version.cmake
+++ b/cmake/version.cmake
@@ -1,29 +1,67 @@
 FIND_PROGRAM(GIT_EXECUTABLE NAMES git git.exe DOC "git command line client")
+FIND_PROGRAM(DATE_EXECUTABLE NAMES date DOC "unix date command")
 
 get_filename_component(SOURCE_DIR ${SRC} PATH)
 
-string(TIMESTAMP VERSION "%y%m%d%H%M")
+if (GIT_EXECUTABLE)
+   EXECUTE_PROCESS(
+      COMMAND ${GIT_EXECUTABLE} log "--format=%ct" # output as unix timestamp
+      WORKING_DIRECTORY "${SOURCE_DIR}"
+      OUTPUT_VARIABLE GIT_OUTPUT_DATE
+      ERROR_VARIABLE GIT_ERROR
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+      ERROR_STRIP_TRAILING_WHITESPACE
+   )
+   if(NOT GIT_OUTPUT_DATE)
+      message(STATUS "Cannot determine current git commit - git error: '${GIT_ERROR}'")
+      set(GIT_OUTPUT_DATE "0000000000")
+   else()
+      EXECUTE_PROCESS(
+         COMMAND ${GIT_EXECUTABLE} log "--format='%h'"
+         WORKING_DIRECTORY "${SOURCE_DIR}"
+         OUTPUT_VARIABLE GIT_OUTPUT_HASH
+         ERROR_VARIABLE GIT_ERROR
+         OUTPUT_STRIP_TRAILING_WHITESPACE
+         ERROR_STRIP_TRAILING_WHITESPACE
+      )
+      if(NOT GIT_OUTPUT_HASH)
+         message(STATUS "Cannot determine current git commit - git error: '${GIT_ERROR}'")
+         set(GIT_OUTPUT_HASH "xdevxgitxnotxfound")
+      endif(NOT GIT_OUTPUT_HASH)
+   endif(NOT GIT_OUTPUT_DATE)
+else()
+   message(STATUS "git not found, cannot record git commit")
+   set(GIT_OUTPUT_DATE "0000000000") # To match length of android versionCode
+   set(GIT_OUTPUT_HASH "xdevxgitxnotxfound")
+endif(GIT_EXECUTABLE)
 
-string(REGEX MATCH "[0-9]+" VERSION_NUM ${VERSION} ) 
-if(NOT VERSION_NUM) 
-   message(STATUS "I can't find a release tag. This is probably not Navit's official tree") 
-   message(STATUS "It's OK, I will default to 0000") 
-   set(VERSION_NUM "0000") 
-endif() 
-string(REPLACE "R" "" VERSION_NUM ${VERSION_NUM} ) 
-if(NOT VERSION_NUM) 
-   set(VERSION_NUM "0000") 
-endif() 
+string(REGEX MATCH "^[0-9]+" VERSION_NUM ${GIT_OUTPUT_DATE} )
 
-string(REGEX MATCH "^[a-z0-9]+" VERSION ${VERSION} )
+EXECUTE_PROCESS(
+   COMMAND ${DATE_EXECUTABLE} "+%y%m%d%H%M" "-d \@${VERSION_NUM}" # output as unix timestamp
+   WORKING_DIRECTORY "${SOURCE_DIR}"
+   OUTPUT_VARIABLE DATE_CONVERT_OUTPUT
+   ERROR_VARIABLE DATE_CONVERT_ERROR
+   OUTPUT_STRIP_TRAILING_WHITESPACE
+   ERROR_STRIP_TRAILING_WHITESPACE
+)
+if(NOT DATE_CONVERT_ERROR)
+   string(REGEX MATCH "[0-9]+" VERSION_CODE ${DATE_CONVERT_OUTPUT})
+else(NOT DATE_CONVERT_ERROR)
+   message(FATAL_ERROR "Date convert not working\nError message:\n${DATE_CONVERT_ERROR}")
+endif(NOT DATE_CONVERT_ERROR)
+
+string(REGEX MATCH "[a-z0-9]+" VERSION ${GIT_OUTPUT_HASH} )
 
 if (STRIP_M)
-   set(VERSION ${VERSION_NUM})
+   set(VERSION ${VERSION_CODE})
 endif()
 
 set(NAVIT_VARIANT "-")
+set(GIT_VERSION VERSION)
 
 set(${NAME} ${VERSION})
 
-message (STATUS "Git commit: ${${NAME}}")
+message (STATUS "Git commit: ${VERSION}")
+message (STATUS "Git   date: ${VERSION_CODE}")
 CONFIGURE_FILE(${SRC} ${DST} @ONLY)
-- 
cgit v1.2.1