$ git clone -n https://github.com/xcp-ng-rpms/qemu /var/lib/mock/v9.0-u-ydi1-11554-29860/root/chroot_tmpdir/scmroot/qemu
Cloning into '/var/lib/mock/v9.0-u-ydi1-11554-29860/root/chroot_tmpdir/scmroot/qemu'...
$ git fetch origin ca0e888b74d9a6e12c6739039b4b5a292af0b525:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/qemu
 * [new ref]         ca0e888b74d9a6e12c6739039b4b5a292af0b525 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca0e888 bump release for test build