$ git clone -n https://src.fedoraproject.org/rpms/kommit.git /var/lib/mock/f42-build-3282756-41399/root/chroot_tmpdir/scmroot/kommit
Cloning into '/var/lib/mock/f42-build-3282756-41399/root/chroot_tmpdir/scmroot/kommit'...
$ git fetch origin d9c90cbd3e92c131c0e93bd3931849224837a5e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kommit
 * [new ref]         d9c90cbd3e92c131c0e93bd3931849224837a5e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d9c90cb Update to 1.7.1