Mergify adds merge commits to a PR when processing PRs using
the queue feature with auto rebase.  Update PatchCheck.py
to ignore commit message issues with these merge commits.
These merge commits are not added to the base branch when
the PR is merged by Mergify.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
---
 BaseTools/Scripts/PatchCheck.py | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/BaseTools/Scripts/PatchCheck.py b/BaseTools/Scripts/PatchCheck.py
index 80754e763c5a..63e6223f8ebc 100755
--- a/BaseTools/Scripts/PatchCheck.py
+++ b/BaseTools/Scripts/PatchCheck.py
@@ -1,7 +1,7 @@
 ## @file
 #  Check a patch for various format issues
 #
-#  Copyright (c) 2015 - 2020, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2015 - 2021, Intel Corporation. All rights reserved.<BR>
 #  Copyright (C) 2020, Red Hat, Inc.<BR>
 #  Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
 #
@@ -89,22 +89,28 @@ class EmailAddressCheck:
 class CommitMessageCheck:
     """Checks the contents of a git commit message."""
 
-    def __init__(self, subject, message):
+    def __init__(self, subject, message, author_email):
         self.ok = True
 
         if subject is None and  message is None:
             self.error('Commit message is missing!')
             return
 
+        MergifyMerge = False
+        if "mergify[bot]@users.noreply.github.com" in author_email:
+            if "Merge branch" in subject:
+                MergifyMerge = True
+
         self.subject = subject
         self.msg = message
 
         print (subject)
 
         self.check_contributed_under()
-        self.check_signed_off_by()
-        self.check_misc_signatures()
-        self.check_overall_format()
+        if not MergifyMerge:
+            self.check_signed_off_by()
+            self.check_misc_signatures()
+            self.check_overall_format()
         self.report_message_result()
 
     url = 'https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Ftianocore%2Ftianocore.github.io%2Fwiki%2FCommit-Message-Format&amp;data=04%7C01%7CBret.Barkelew%40microsoft.com%7C44bf20b900a8463872f608d941c36036%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637613129659549071%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=ScoSoLs0hgaj7DOtCjE1uevYTX2oAHOqJOHKJYZQ%2BGw%3D&amp;reserved=0'
@@ -522,7 +528,7 @@ class CheckOnePatch:
         email_check = EmailAddressCheck(self.author_email, 'Author')
         email_ok = email_check.ok
 
-        msg_check = CommitMessageCheck(self.commit_subject, self.commit_msg)
+        msg_check = CommitMessageCheck(self.commit_subject, self.commit_msg, self.author_email)
         msg_ok = msg_check.ok
 
         diff_ok = True
--
2.32.0.windows.1