$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-u-abourgeois2-10768-29297/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-u-abourgeois2-10768-29297/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin b4f3ecea953c5f9d5d553031fc92f2c9bc124195:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         b4f3ecea953c5f9d5d553031fc92f2c9bc124195 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4f3ece bump release for test build