$ git clone -n https://github.com/xcp-ng-rpms/wget /var/lib/mock/v8.3-incoming-10707-29255/root/chroot_tmpdir/scmroot/wget
Cloning into '/var/lib/mock/v8.3-incoming-10707-29255/root/chroot_tmpdir/scmroot/wget'...
$ git fetch origin fbaeb964f0ac51ce9c3a85a18d8448c6d6b83244:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/wget
 * [new ref]         fbaeb964f0ac51ce9c3a85a18d8448c6d6b83244 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fbaeb96 Merge pull request #1 from xcp-ng-rpms/8.3-XS-1557