获取版本信息准则修改：获取最新commitID；若存在tag，获取tag信息；若不存在tag，tag为NULL

build.sh

@@ -15,10 +15,18 @@ cache_option="no"
 test_option="no"
 case_id=0
 board_option="EVB"
-arm_version=`git log -1 --format="%H"`
+arm_version=`git log --decorate -1 | sed -n '1p' | awk '{print substr($2,0)}'`
-arm_tag=`git tag | sed -n '$p'`
 arm_build_date=`date +"%Y-%m-%d-%H:%M:%S"`
 
+#判断tag是否存在
+if [ -z `git log --decorate -1 | grep -oP '(?<=tag: ).*'` ]
+    then
+        arm_tag="NULL";
+    else
+        arm_tag=`git log --decorate -1 | grep -oP '(?<=tag: ).*'`
+        arm_tag=${arm_tag%?}
+fi
+
 while [[ "$#" > 0 ]]; do
     case $1 in
         --cache) cache_option="yes"; shift;;