$ git clone -n https://github.com/xcp-ng-rpms/host-installer.git /var/lib/mock/v8.3-u-ydi2-10844-29359/root/chroot_tmpdir/scmroot/host-installer
Cloning into '/var/lib/mock/v8.3-u-ydi2-10844-29359/root/chroot_tmpdir/scmroot/host-installer'...
$ git fetch origin a85f53bc8fc2883fe76e71491f777fd43336d072:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/host-installer
 * [new ref]         a85f53bc8fc2883fe76e71491f777fd43336d072 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a85f53b bump release for test build