$ git clone -n https://github.com/xcp-ng-rpms/wget.git /var/lib/mock/v8.3-u-pcoval2-10540-29092/root/chroot_tmpdir/scmroot/wget
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10540-29092/root/chroot_tmpdir/scmroot/wget'...
$ git fetch origin aadd4a4e122521f08f3171ec91d6c13ac0f35386:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/wget
 * [new ref]         aadd4a4e122521f08f3171ec91d6c13ac0f35386 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aadd4a4 bump release for test build