$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-incoming-8908-27862/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-incoming-8908-27862/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin e5e7e854716c3d1341a56145e585cbe2b3963eed:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         e5e7e854716c3d1341a56145e585cbe2b3963eed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e5e7e85 Release 3.55.5-2.3