$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-deps.git /var/lib/mock/v8.3-incoming-10770-29291/root/chroot_tmpdir/scmroot/xcp-ng-deps
Cloning into '/var/lib/mock/v8.3-incoming-10770-29291/root/chroot_tmpdir/scmroot/xcp-ng-deps'...
$ git fetch origin 5992b8c36f221e75b1288761afc42ded40ae67ec:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-deps
 * [new ref]         5992b8c36f221e75b1288761afc42ded40ae67ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5992b8c Install traceroute