$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-incoming-8914-27862/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-incoming-8914-27862/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin e1b94d3268333ada7721b2a0b1664cc9fc0c8317:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         e1b94d3268333ada7721b2a0b1664cc9fc0c8317 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1b94d3 Merge pull request #11 from xcp-ng-rpms/ran-fix-negative-coalesce-size