$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release.git /var/lib/mock/v8.3-u-gln1-10954-29415/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v8.3-u-gln1-10954-29415/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin e4a750bd7e5b8982c14aa41166b46e30883b6334:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         e4a750bd7e5b8982c14aa41166b46e30883b6334 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4a750b bump release for test build