gcc-changelog: fix when somebody reverts a backport

contrib/ChangeLog:

	* gcc-changelog/git_commit.py: When reverting a backport,
	we should print only Revert header.

diff --git a/contrib/gcc-changelog/git_commit.py b/contrib/gcc-changelog/git_commit.py
index 827976c..5a9cc4c 100755 (executable)
--- a/contrib/gcc-changelog/git_commit.py
+++ b/contrib/gcc-changelog/git_commit.py
@@ -628,7 +628,11 @@ class GitCommit:
         for entry in self.changelog_entries:
             output = ''
             timestamp = entry.datetime
-            if self.cherry_pick_commit:
+            if self.revert_commit:
+                timestamp = current_timestamp
+                orig_date = self.original_info.date
+                current_timestamp = orig_date.strftime(DATE_FORMAT)
+            elif self.cherry_pick_commit:
                 info = self.commit_to_info_hook(self.cherry_pick_commit)
                 # it can happen that it is a cherry-pick for a different
                 # repository
@@ -636,10 +640,6 @@ class GitCommit:
                     timestamp = info.date.strftime(DATE_FORMAT)
                 else:
                     timestamp = current_timestamp
-            elif self.revert_commit:
-                timestamp = current_timestamp
-                orig_date = self.original_info.date
-                current_timestamp = orig_date.strftime(DATE_FORMAT)
             elif not timestamp or use_commit_ts:
                 timestamp = current_timestamp
             authors = entry.authors if entry.authors else [self.info.author]
@@ -649,12 +649,13 @@ class GitCommit:
                     authors.append(author)
 
             if self.cherry_pick_commit or self.revert_commit:
-                output += self.format_authors_in_changelog([self.info.author],
+                original_author = self.original_info.author
+                output += self.format_authors_in_changelog([original_author],
                                                            current_timestamp)
-                if self.cherry_pick_commit:
-                    output += '\tBackported from master:\n'
-                else:
+                if self.revert_commit:
                     output += '\tRevert:\n'
+                else:
+                    output += '\tBackported from master:\n'
                 output += self.format_authors_in_changelog(authors,
                                                            timestamp, '\t')
             else: