$ git clone -n https://github.com/xcp-ng-rpms/blktap /var/lib/mock/v8.3-incoming-8843-27781/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-incoming-8843-27781/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin d39b3160bfe019196bcc015de3e6798807e1381f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         d39b3160bfe019196bcc015de3e6798807e1381f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d39b316 Drop useless autogen build-dep