$ git clone -n https://github.com/xcp-ng-rpms/wget.git /var/lib/mock/v8.3-u-pcoval1-11088-29519/root/chroot_tmpdir/scmroot/wget
Cloning into '/var/lib/mock/v8.3-u-pcoval1-11088-29519/root/chroot_tmpdir/scmroot/wget'...
$ git fetch origin 5bb254ad8233c5e9580a34cc07d53b46f7fa88b9:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/wget
 * [new ref]         5bb254ad8233c5e9580a34cc07d53b46f7fa88b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5bb254a bump release for test build