$ git clone -n https://src.fedoraproject.org/rpms/verilator.git /var/lib/mock/f39-build-1622432-38814/root/chroot_tmpdir/scmroot/verilator
Cloning into '/var/lib/mock/f39-build-1622432-38814/root/chroot_tmpdir/scmroot/verilator'...
$ git fetch origin 6f92137ff1ace98f4b81835f0e171b2f9730f259:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/verilator
 * [new ref]         6f92137ff1ace98f4b81835f0e171b2f9730f259 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f92137 fix build requires