$ git clone -n https://github.com/xcp-ng-rpms/xcp-featured.git /var/lib/mock/v8.3-u-pcoval2-10443-29003/root/chroot_tmpdir/scmroot/xcp-featured
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10443-29003/root/chroot_tmpdir/scmroot/xcp-featured'...
$ git fetch origin 720ce2d524b31add501b2aa2ef2c4c2daeca8a66:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-featured
 * [new ref]         720ce2d524b31add501b2aa2ef2c4c2daeca8a66 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 720ce2d bump release for test build