$ git clone -n https://github.com/xcp-ng-rpms/p11-kit /var/lib/mock/v8.3-u-pcoval2-11061-29496/root/chroot_tmpdir/scmroot/p11-kit
Cloning into '/var/lib/mock/v8.3-u-pcoval2-11061-29496/root/chroot_tmpdir/scmroot/p11-kit'...
$ git fetch origin bd6c672ccadc1cdfcf8919d26c1c2c206d5ae2f6:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/p11-kit
 * [new ref]         bd6c672ccadc1cdfcf8919d26c1c2c206d5ae2f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd6c672 bump release for test build