$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release.git /var/lib/mock/v8.3-u-gln1-10992-29430/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v8.3-u-gln1-10992-29430/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin e62722c006330d0b3214b62c9e654b0354f23728:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         e62722c006330d0b3214b62c9e654b0354f23728 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e62722c bump release for test build