$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-11304-29638/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-11304-29638/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 833e8e80292cc69e1ecfa5f81f4d034d2473abed:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         833e8e80292cc69e1ecfa5f81f4d034d2473abed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 833e8e8 bump release for test build