$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9026-27917/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9026-27917/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin face58531a0a5cf780f4ad987e60b8ad6d13c582:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         face58531a0a5cf780f4ad987e60b8ad6d13c582 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at face585 bump release for test build