$ git clone -n https://src.fedoraproject.org/rpms/abook.git /var/lib/mock/f41-build-side-1-2631363-25703/root/chroot_tmpdir/scmroot/abook
Cloning into '/var/lib/mock/f41-build-side-1-2631363-25703/root/chroot_tmpdir/scmroot/abook'...
$ git fetch origin 6e8f83dd8093c4bebf8dd21e300e71febe8999d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/abook
 * [new ref]         6e8f83dd8093c4bebf8dd21e300e71febe8999d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e8f83d convert GPLv2+ license to SPDX