$ git clone -n https://github.com/xcp-ng-rpms/python-pycurl.git /var/lib/mock/v8.3-incoming-9087-27939/root/chroot_tmpdir/scmroot/python-pycurl
Cloning into '/var/lib/mock/v8.3-incoming-9087-27939/root/chroot_tmpdir/scmroot/python-pycurl'...
$ git fetch origin 3e8288b8ae74c95f8212352e394d69a18f289e6e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/python-pycurl
 * [new ref]         3e8288b8ae74c95f8212352e394d69a18f289e6e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e8288b Import python-pycurl-7.19.0-20.xs8.src.rpm