$ git clone -n https://src.fedoraproject.org/rpms/yggdrasil.git /var/lib/mock/f40-build-2151653-50906/root/chroot_tmpdir/scmroot/yggdrasil
Cloning into '/var/lib/mock/f40-build-2151653-50906/root/chroot_tmpdir/scmroot/yggdrasil'...
$ git fetch origin 10c784ef86ec115708ecae5605eacdade5a26525:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yggdrasil
 * [new ref]         10c784ef86ec115708ecae5605eacdade5a26525 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10c784e Update to version 0.4.1 (RHBZ#2239102)