$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release /var/lib/mock/v9.0-u-ydi1-10802-29315/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v9.0-u-ydi1-10802-29315/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin 2c32f2e064b861d4e110dedf7d0645dcf931962d:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         2c32f2e064b861d4e110dedf7d0645dcf931962d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c32f2e bump release for test build