$ git clone -n https://src.fedoraproject.org/rpms/libmamba.git /var/lib/mock/f45-build-16517-487/root/chroot_tmpdir/scmroot/libmamba
Cloning into '/var/lib/mock/f45-build-16517-487/root/chroot_tmpdir/scmroot/libmamba'...
$ git fetch origin f0bb32120855e77ccb60561e79afdf3f75581a13:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmamba
 * [new ref]         f0bb32120855e77ccb60561e79afdf3f75581a13 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f0bb321 Drop old patch