$ git clone -n https://src.fedoraproject.org/rpms/tmt.git /var/lib/mock/f41-build-side-1-2949566-35473/root/chroot_tmpdir/scmroot/tmt
Cloning into '/var/lib/mock/f41-build-side-1-2949566-35473/root/chroot_tmpdir/scmroot/tmt'...
$ git fetch origin ff309fb8d9f89488f28919863e2198775ddeab1b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tmt
 * [new ref]         ff309fb8d9f89488f28919863e2198775ddeab1b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff309fb Update to 1.37.0 upstream release