$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-11409-29722/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-11409-29722/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin e74419f8f47ddcec1d6cab4fbe34ca6d7a6a6d5a:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         e74419f8f47ddcec1d6cab4fbe34ca6d7a6a6d5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e74419f bump release for test build