$ git clone -n https://github.com/xcp-ng-rpms/bind.git /var/lib/mock/v8.3-u-pcoval2-10572-29126/root/chroot_tmpdir/scmroot/bind
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10572-29126/root/chroot_tmpdir/scmroot/bind'...
$ git fetch origin c9f408bf05d5745df4a45685581f43b7dcd35ff7:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/bind
 * [new ref]         c9f408bf05d5745df4a45685581f43b7dcd35ff7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c9f408b bump release for test build