$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9689-28408/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9689-28408/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 24c206ce60a69e369f103e298183a5f3b6eb4638:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         24c206ce60a69e369f103e298183a5f3b6eb4638 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 24c206c bump release for test build