Make post-commit trigger not send emails when the message would not contain

any actual changes. (Often the case in merges where the only change involves
renumbering ChangeSet entries.)

BitKeeper/triggers/post-commit

@@ -19,6 +19,13 @@ BK_STATUS=$BK_STATUS$BK_COMMIT
 if [ "$BK_STATUS" = OK ]
 then 
 
+HAS_ACTUAL_CHANGES=`bk cset -r+ -d | grep -v "^#"`
+if [ "$HAS_ACTUAL_CHANGES" = "" ]
+then
+  echo ChangeSet had no real changes, not sending emails
+  exit
+fi
+
 CHANGESET=`bk -R prs -r+ -h -d':P:::I:' ChangeSet`
 BUG=`bk -R prs -r+ -h -d':C:' ChangeSet | sed -ne 's/^.*[Bb][Uu][Gg] *# *\([0-9][0-9]*\).*$/\1/p'`