$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release.git /var/lib/mock/v8.3-u-gln1-10957-29416/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v8.3-u-gln1-10957-29416/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin 1fcda910fc0d17f95a28437d60e3f971504d5590:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         1fcda910fc0d17f95a28437d60e3f971504d5590 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1fcda91 bump release for test build