$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release.git /var/lib/mock/v8.3-incoming-9404-28149/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v8.3-incoming-9404-28149/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin b46d6f0286dd4a2a3f3d4abbe6f55440a938770f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         b46d6f0286dd4a2a3f3d4abbe6f55440a938770f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b46d6f0 Merge branch 'XS-8.3' into 8.3-rebase-XS20250922