$ git clone -n https://github.com/xcp-ng-rpms/qemu.git /var/lib/mock/v8.3-u-ndinh1-9450-28191/root/chroot_tmpdir/scmroot/qemu
Cloning into '/var/lib/mock/v8.3-u-ndinh1-9450-28191/root/chroot_tmpdir/scmroot/qemu'...
$ git fetch origin 72fe1d1e9f283320208caeb8112478b9f29bc150:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/qemu
 * [new ref]         72fe1d1e9f283320208caeb8112478b9f29bc150 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 72fe1d1 bump release for test build