$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9669-28390/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9669-28390/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin a37746540c8312925c3999df449e111c0aa85e82:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         a37746540c8312925c3999df449e111c0aa85e82 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a377465 bump release for test build