$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-11411-29726/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-11411-29726/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin c239b7acab7320c418b0e3fc06a521e0410c495d:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         c239b7acab7320c418b0e3fc06a521e0410c495d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c239b7a bump release for test build