$ git clone -n https://src.fedoraproject.org/rpms/mc.git /var/lib/mock/f40-build-2238267-53561/root/chroot_tmpdir/scmroot/mc
Cloning into '/var/lib/mock/f40-build-2238267-53561/root/chroot_tmpdir/scmroot/mc'...
$ git fetch origin 3b9a2263ca242c104ae67fa5c4e61ec2de2c30f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mc
 * [new ref]         3b9a2263ca242c104ae67fa5c4e61ec2de2c30f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b9a226 mc-4.8.30-1.fc40