import-orig: Refactor vcs_tag_parent

This makes the "tag" variable just the tag.  This improves the
human-readability of the error message if the tag cannot be found.

diff --git a/gbp/deb/git.py b/gbp/deb/git.py
index a70158930e4ed7aa94e75e192252200a6cbca523..4a17c2dba321bd0018e82269e7cc67354d9fac22 100644 (file)
--- a/gbp/deb/git.py
+++ b/gbp/deb/git.py
@@ -378,8 +378,8 @@ class DebianGitRepository(PkgGitRepository):
         if not vcs_tag_format:
             return None
         try:
-            tag = "%s^{}" % self.version_to_tag(vcs_tag_format, version)
-            return [self.rev_parse(tag)]
+            tag = self.version_to_tag(vcs_tag_format, version)
+            return [self.rev_parse("%s^{}" % tag)]
         except GitRepositoryError:
             raise GitRepositoryError("Can't find upstream vcs tag at '%s'" % tag)