$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-u-abourgeois1-9627-28359/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-u-abourgeois1-9627-28359/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin dbd51c24e5ef233120d96f3a488a44b17ad07e72:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         dbd51c24e5ef233120d96f3a488a44b17ad07e72 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dbd51c2 bump release for test build