$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9202-28000/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9202-28000/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 76881512c3e641a43c20d4038be9a2a984b50372:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         76881512c3e641a43c20d4038be9a2a984b50372 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7688151 bump release for test build