$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-incoming-11539-29855/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-incoming-11539-29855/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin 076d17afde2a15a2bd477ecd02ff82a45a053a73:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         076d17afde2a15a2bd477ecd02ff82a45a053a73 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 076d17a Merge remote-tracking branch 'XS-8.3' into 8.3