$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-xapi-plugins.git /var/lib/mock/v8.3-u-srodot1-11199-29588/root/chroot_tmpdir/scmroot/xcp-ng-xapi-plugins
Cloning into '/var/lib/mock/v8.3-u-srodot1-11199-29588/root/chroot_tmpdir/scmroot/xcp-ng-xapi-plugins'...
$ git fetch origin 26c27dd52e0b8b095ba3ec9a0d5680864d5867e1:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-xapi-plugins
 * [new ref]         26c27dd52e0b8b095ba3ec9a0d5680864d5867e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26c27dd bump release for test build