$ git clone -n https://src.fedoraproject.org/rpms/mojo-executor.git /var/lib/mock/f42-build-3364935-45045/root/chroot_tmpdir/scmroot/mojo-executor
Cloning into '/var/lib/mock/f42-build-3364935-45045/root/chroot_tmpdir/scmroot/mojo-executor'...
$ git fetch origin 343fb4368ae86d65beb6f7c40db2e19830648171:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mojo-executor
 * [new ref]         343fb4368ae86d65beb6f7c40db2e19830648171 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 343fb43 Remove workaround for duplicate reactor entries