$ git clone -n https://src.fedoraproject.org/rpms/workflow.git /var/lib/mock/f38-build-side-42-init-devel-1061274-29766/root/chroot_tmpdir/scmroot/workflow
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1061274-29766/root/chroot_tmpdir/scmroot/workflow'...
$ git fetch origin b6e9460a5d164277f67eefdff6c4419df26a6c2e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/workflow
 * [new ref]         b6e9460a5d164277f67eefdff6c4419df26a6c2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6e9460 Initial import (fedora#2157252).