$ git clone -n https://src.fedoraproject.org/rpms/wingpanel.git /var/lib/mock/f41-build-857008-167860/root/chroot_tmpdir/scmroot/wingpanel
Cloning into '/var/lib/mock/f41-build-857008-167860/root/chroot_tmpdir/scmroot/wingpanel'...
$ git fetch origin e6bfdb67babff70b89e5b35bbad581ee321b3d36:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wingpanel
 * [new ref]         e6bfdb67babff70b89e5b35bbad581ee321b3d36 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6bfdb6 Bump to commit 4dd9990 for compatibility with mutter 46