$ git clone -n https://src.fedoraproject.org/rpms/qcomicbook.git /var/lib/mock/f41-build-side-1-2662511-28809/root/chroot_tmpdir/scmroot/qcomicbook
Cloning into '/var/lib/mock/f41-build-side-1-2662511-28809/root/chroot_tmpdir/scmroot/qcomicbook'...
$ git fetch origin 39b08e3e6128369049807c32ce55d41657262e51:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qcomicbook
 * [new ref]         39b08e3e6128369049807c32ce55d41657262e51 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39b08e3 convert GPLv2 license to SPDX