$ git clone -n https://src.fedoraproject.org/rpms/fedora-upgrade.git /var/lib/mock/f42-build-side-1-3534297-46548/root/chroot_tmpdir/scmroot/fedora-upgrade
Cloning into '/var/lib/mock/f42-build-side-1-3534297-46548/root/chroot_tmpdir/scmroot/fedora-upgrade'...
$ git fetch origin cdac71d5f0ffa68fd5983465b981146aad9d2365:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedora-upgrade
 * [new ref]         cdac71d5f0ffa68fd5983465b981146aad9d2365 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cdac71d Update fedora-upgrade to 42.2-1