$ git clone -n https://github.com/xcp-ng-rpms/wget.git /var/lib/mock/v8.3-u-pcoval1-11094-29519/root/chroot_tmpdir/scmroot/wget
Cloning into '/var/lib/mock/v8.3-u-pcoval1-11094-29519/root/chroot_tmpdir/scmroot/wget'...
$ git fetch origin ea6f2c51713a18c7dae735f0b5f9a3595752b0d7:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/wget
 * [new ref]         ea6f2c51713a18c7dae735f0b5f9a3595752b0d7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea6f2c5 bump release for test build