$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-11419-29733/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-11419-29733/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 49830e1dbe5cf7ca3919fc68b92c008b7d70c1cd:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         49830e1dbe5cf7ca3919fc68b92c008b7d70c1cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49830e1 bump release for test build