$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-10834-29347/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-10834-29347/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin e515095702b34d92adefa19f89f95ef767ff2787:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         e515095702b34d92adefa19f89f95ef767ff2787 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e515095 bump release for test build