$ git clone -n https://src.fedoraproject.org/rpms/fedora-iot-config.git /var/lib/mock/f38-build-side-42-init-devel-648897-26463/root/chroot_tmpdir/scmroot/fedora-iot-config
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-648897-26463/root/chroot_tmpdir/scmroot/fedora-iot-config'...
$ git fetch origin 32586784b48fe5bc0ce39434f76cbc0f1a7b43a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedora-iot-config
 * [new ref]         32586784b48fe5bc0ce39434f76cbc0f1a7b43a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3258678 Initial commit.