$ git clone -n https://github.com/xcp-ng-rpms/qemu /var/lib/mock/v9.0-u-ydi1-11552-29860/root/chroot_tmpdir/scmroot/qemu
Cloning into '/var/lib/mock/v9.0-u-ydi1-11552-29860/root/chroot_tmpdir/scmroot/qemu'...
$ git fetch origin b0e0d3844eb301afba26481851d47a43d67a5900:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/qemu
 * [new ref]         b0e0d3844eb301afba26481851d47a43d67a5900 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
Filtering content: 100% (2/2)
Filtering content: 100% (2/2), 27.03 MiB | 4.95 MiB/s, done.
HEAD is now at b0e0d38 bump release for test build