$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release /var/lib/mock/v8.3-incoming-9655-28381/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v8.3-incoming-9655-28381/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin 6c32fd8a29a1960caf24af3d67b9df27936a44be:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         6c32fd8a29a1960caf24af3d67b9df27936a44be -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c32fd8 chore(spec): Update changelog