$ git clone -n https://github.com/xcp-ng-rpms/qemu.git /var/lib/mock/v8.3-u-ndinh1-9456-28197/root/chroot_tmpdir/scmroot/qemu
Cloning into '/var/lib/mock/v8.3-u-ndinh1-9456-28197/root/chroot_tmpdir/scmroot/qemu'...
$ git fetch origin 72345566cb0592be1a0394dc6ab93ab31e518e37:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/qemu
 * [new ref]         72345566cb0592be1a0394dc6ab93ab31e518e37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7234556 bump release for test build