$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-10322-28890/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-10322-28890/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin eb2c82431e6102f132d401f2297a00625779eea9:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         eb2c82431e6102f132d401f2297a00625779eea9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb2c824 bump release for test build