$ git clone -n https://github.com/xcp-ng-rpms/curl /var/lib/mock/v8.3-incoming-10664-29217/root/chroot_tmpdir/scmroot/curl
Cloning into '/var/lib/mock/v8.3-incoming-10664-29217/root/chroot_tmpdir/scmroot/curl'...
$ git fetch origin d8b107151214e5be875432b7316b6f20d55e8697:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/curl
 * [new ref]         d8b107151214e5be875432b7316b6f20d55e8697 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d8b1071 Merge pull request #7 from xcp-ng-rpms/8.3-XS-1557