Update commit-msg hook to version from Gerrit 2.12.1

Change-Id: I31b74aba998f8e83f370a759218777f2557a8872

hooks/commit-msg

@@ -1,6 +1,7 @@
 #!/bin/sh
+# From Gerrit Code Review 2.12.1
 #
-# Part of Gerrit Code Review (http://code.google.com/p/gerrit/)
+# Part of Gerrit Code Review (https://www.gerritcodereview.com/)
 #
 # Copyright (C) 2009 The Android Open Source Project
 #
@@ -19,7 +20,7 @@
 
 unset GREP_OPTIONS
 
-CHANGE_ID_AFTER="Bug|Issue"
+CHANGE_ID_AFTER="Bug|Issue|Test"
 MSG="$1"
 
 # Check for, and add if missing, a unique Change-Id
@@ -38,6 +39,12 @@ add_ChangeId() {
 		return
 	fi
 
+	# Do not add Change-Id to temp commits
+	if echo "$clean_message" | head -1 | grep -q '^\(fixup\|squash\)!'
+	then
+		return
+	fi
+
 	if test "false" = "`git config --bool --get gerrit.createChangeId`"
 	then
 		return
@@ -57,6 +64,10 @@ add_ChangeId() {
 		AWK=/usr/xpg4/bin/awk
 	fi
 
+	# Get core.commentChar from git config or use default symbol
+	commentChar=`git config --get core.commentChar`
+	commentChar=${commentChar:-#}
+
 	# How this works:
 	# - parse the commit message as (textLine+ blankLine*)*
 	# - assume textLine+ to be a footer until proven otherwise
@@ -75,8 +86,8 @@ add_ChangeId() {
 		blankLines = 0
 	}
 
-	# Skip lines starting with "#" without any spaces before it.
-	/^#/ { next }
+	# Skip lines starting with commentChar without any spaces before it.
+	/^'"$commentChar"'/ { next }
 
 	# Skip the line starting with the diff command and everything after it,
 	# up to the end of the file, assuming it is only patch data.