$ git clone -n https://src.fedoraproject.org/rpms/duplicity.git /var/lib/mock/f45-build-51950-905/root/chroot_tmpdir/scmroot/duplicity
Cloning into '/var/lib/mock/f45-build-51950-905/root/chroot_tmpdir/scmroot/duplicity'...
$ git fetch origin 57a31761e393598c6ba06f8609b98f73e8bb32f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/duplicity
 * [new ref]         57a31761e393598c6ba06f8609b98f73e8bb32f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57a3176 Allow 3.15 at runtime