$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-11403-29714/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-11403-29714/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 0c9571dc7a21a1143c29e16d14eb57a8e53ef174:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         0c9571dc7a21a1143c29e16d14eb57a8e53ef174 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0c9571d bump release for test build