$ git clone -n https://src.fedoraproject.org/rpms/mytop.git /var/lib/mock/f41-build-1280190-23177/root/chroot_tmpdir/scmroot/mytop
Cloning into '/var/lib/mock/f41-build-1280190-23177/root/chroot_tmpdir/scmroot/mytop'...
$ git fetch origin 7f76a3addd0b3e60ed1d7a7dfd1003b46cd47ce6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mytop
 * [new ref]         7f76a3addd0b3e60ed1d7a7dfd1003b46cd47ce6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f76a3a Some minor fixes