$ git clone -n https://src.fedoraproject.org/rpms/bout++.git /var/lib/mock/f39-build-1901630-42859/root/chroot_tmpdir/scmroot/bout++
Cloning into '/var/lib/mock/f39-build-1901630-42859/root/chroot_tmpdir/scmroot/bout++'...
$ git fetch origin a057e54cbe572cfe2eaf948bbdabca45fb42e310:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bout++
 * [new ref]         a057e54cbe572cfe2eaf948bbdabca45fb42e310 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a057e54 Update to v5.1.0