$ git clone -n https://src.fedoraproject.org/rpms/cantera.git /var/lib/mock/f41-build-2441678-25470/root/chroot_tmpdir/scmroot/cantera
Cloning into '/var/lib/mock/f41-build-2441678-25470/root/chroot_tmpdir/scmroot/cantera'...
$ git fetch origin b1b4d60db2d4bcb641a6b803583b38a93024fc5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cantera
 * [new ref]         b1b4d60db2d4bcb641a6b803583b38a93024fc5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1b4d60 convert license to SPDX