$ git clone -n https://src.fedoraproject.org/rpms/arm-trusted-firmware.git /var/lib/mock/f43-build-59165917-6571428/root/chroot_tmpdir/scmroot/arm-trusted-firmware
Cloning into '/var/lib/mock/f43-build-59165917-6571428/root/chroot_tmpdir/scmroot/arm-trusted-firmware'...
$ git fetch origin bc3bf7b064f95a509f265469c8d32aa35ba93601:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/arm-trusted-firmware
 * [new ref]         bc3bf7b064f95a509f265469c8d32aa35ba93601 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc3bf7b v2.12.2