$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-10344-28904/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-10344-28904/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 2f59baf57460f8d67d307b0df3d242acd3cf3d1f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         2f59baf57460f8d67d307b0df3d242acd3cf3d1f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f59baf bump release for test build