$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov1-9059-27927/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov1-9059-27927/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin c09c72a5255b18c789abcb4930830de2a1b4595f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         c09c72a5255b18c789abcb4930830de2a1b4595f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c09c72a QCOW2 import-export patches