$ git clone -n https://src.fedoraproject.org/rpms/yash.git /var/lib/mock/f40-build-804199-144463/root/chroot_tmpdir/scmroot/yash
Cloning into '/var/lib/mock/f40-build-804199-144463/root/chroot_tmpdir/scmroot/yash'...
$ git fetch origin 875117cd7e88affc24cb757628690de1336b42b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yash
 * [new ref]         875117cd7e88affc24cb757628690de1336b42b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 875117c 2.56.1