$ git clone -n https://github.com/xcp-ng-rpms/ca-certificates /var/lib/mock/v8.3-u-pcoval1-10988-29428/root/chroot_tmpdir/scmroot/ca-certificates
Cloning into '/var/lib/mock/v8.3-u-pcoval1-10988-29428/root/chroot_tmpdir/scmroot/ca-certificates'...
$ git fetch origin d5e55dbb78b75121371895ee17b1613dd957d8fe:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/ca-certificates
 * [new ref]         d5e55dbb78b75121371895ee17b1613dd957d8fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5e55db bump release for test build