$ git clone -n https://github.com/xcp-ng-rpms/p11-kit /var/lib/mock/v8.3-u-pcoval1-11014-29448/root/chroot_tmpdir/scmroot/p11-kit
Cloning into '/var/lib/mock/v8.3-u-pcoval1-11014-29448/root/chroot_tmpdir/scmroot/p11-kit'...
$ git fetch origin 9ffb6b6a166a8a4317033465419e7a617bffe1fb:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/p11-kit
 * [new ref]         9ffb6b6a166a8a4317033465419e7a617bffe1fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ffb6b6 bump release for test build