$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-u-pcoval2-10428-28989/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10428-28989/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin 74b7658900da0de59b2ade3ea771307176bceb2e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         74b7658900da0de59b2ade3ea771307176bceb2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74b7658 bump release for test build