tools: patman: Handle tag sections without an 'END'

'Cover-letter', 'Series-notes' and 'Commit-notes' tags require an
'END' to be put at the end of its section. If we forget to put an
'END' in those sections, and these sections are followed by another
patman tag, patman generates incorrect patches. This adds codes to
handle such scenario.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

tools/patman/patchstream.py

@@ -169,6 +169,26 @@ class PatchStream:
         elif commit_match:
             self.state = STATE_MSG_HEADER
 
+        # If a tag is detected, but we are already in a section,
+        # this means 'END' is missing for that section, fix it up.
+        if series_tag_match or commit_tag_match or \
+           cover_match or cover_cc_match or signoff_match:
+            if self.in_section:
+                self.warn.append("Missing 'END' in section '%s'" % self.in_section)
+                if self.in_section == 'cover':
+                    self.series.cover = self.section
+                elif self.in_section == 'notes':
+                    if self.is_log:
+                        self.series.notes += self.section
+                elif self.in_section == 'commit-notes':
+                    if self.is_log:
+                        self.commit.notes += self.section
+                else:
+                    self.warn.append("Unknown section '%s'" % self.in_section)
+                self.in_section = None
+                self.skip_blank = True
+                self.section = []
+
         # If we are in a section, keep collecting lines until we see END
         if self.in_section:
             if line == 'END':