$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-11463-29768/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-11463-29768/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin e90c371583ecd81a06df4b0cb77d14c8c37c967c:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         e90c371583ecd81a06df4b0cb77d14c8c37c967c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e90c371 bump release for test build