$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9915-28606/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9915-28606/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin da7113f4a6962684aac0773a5f0f6e329344f39e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         da7113f4a6962684aac0773a5f0f6e329344f39e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da7113f bump release for test build