checkpatch.sh: add -m option to enable/disable Change-Id check

Defaultly disable Change-Id check in commit message.

Signed-off-by: liuhaitao <liuhaitao@xiaomi.com>

tools/checkpatch.sh

@@ -23,6 +23,7 @@ check=check_patch
 fail=0
 range=0
 spell=0
+message=0
 
 usage() {
   echo "USAGE: ${0} [options] [list|-]"
@@ -32,6 +33,7 @@ usage() {
   echo "-c spell check with codespell(install with: pip install codespell)"
   echo "-r range check only (coupled with -p or -g)"
   echo "-p <patch file names> (default)"
+  echo "-m Change-Id check in commit message (coupled with -g)"
   echo "-g <commit list>"
   echo "-f <file list>"
   echo "-  read standard input mainly used by git pre-commit hook as below:"
@@ -122,8 +124,10 @@ check_msg() {
 }
 
 check_commit() {
-  msg=`git show -s --format=%B $1`
-  check_msg <<< "$msg"
+  if [ $message != 0 ]; then
+    msg=`git show -s --format=%B $1`
+    check_msg <<< "$msg"
+  fi
   diffs=`git diff $1`
   check_ranges <<< "$diffs"
 }
@@ -146,6 +150,9 @@ while [ ! -z "$1" ]; do
   -f )
     check=check_file
     ;;
+  -m )
+    message=1
+    ;;
   -g )
     check=check_commit
     ;;