$ git clone -n https://github.com/xcp-ng-rpms/openssl.git /var/lib/mock/v8.3-u-pcoval2-10545-29101/root/chroot_tmpdir/scmroot/openssl
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10545-29101/root/chroot_tmpdir/scmroot/openssl'...
$ git fetch origin 52d4772cbb9ff3a4f7aa3f0c23a9ea443a9dcab1:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/openssl
 * [new ref]         52d4772cbb9ff3a4f7aa3f0c23a9ea443a9dcab1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52d4772 bump release for test build