$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-deps.git /var/lib/mock/v8.3-incoming-10869-29365/root/chroot_tmpdir/scmroot/xcp-ng-deps
Cloning into '/var/lib/mock/v8.3-incoming-10869-29365/root/chroot_tmpdir/scmroot/xcp-ng-deps'...
$ git fetch origin c855f4b1913ccf38804ddc577b6504963bb23609:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-deps
 * [new ref]         c855f4b1913ccf38804ddc577b6504963bb23609 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c855f4b Obsolete unused devel packages (installed by mistake)