fix: use full refspec path

diff --git a/debian_build.py b/debian_build.py
index 1ca707089e9ff82e9cb0158c1ef94e88f3f5f6cd..81f1002eeefe955ba7bc7c0f7459c7da7a9891b2 100755 (executable)
--- a/debian_build.py
+++ b/debian_build.py
@@ -278,7 +278,9 @@ if __name__ == '__main__':
 
     # git-buildpackage uses only treeish object in v0.5.10,
     # let's fetch it correctly:
-    GIT_UPSTREAM_BRANCH = git_helper.git_get_treeish(GIT_UPSTREAM_BRANCH)
+    GIT_UPSTREAM_BRANCH = git_helper.git_get_treeish(
+        os.path.join('origin', GIT_UPSTREAM_BRANCH)
+    )
 
     repo = git.repo.Repo()