$ git clone -n https://github.com/xcp-ng-rpms/cmocka.git /var/lib/mock/v8.3-incoming-11153-29567/root/chroot_tmpdir/scmroot/cmocka
Cloning into '/var/lib/mock/v8.3-incoming-11153-29567/root/chroot_tmpdir/scmroot/cmocka'...
$ git fetch origin f0464a9f394e7e3fb9dccb82f33dc02267f53775:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/cmocka
 * [new ref]         f0464a9f394e7e3fb9dccb82f33dc02267f53775 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f0464a9 Import cmocka-1.1.7-2.xs8.src.rpm