$ git clone -n https://github.com/xcp-ng-rpms/wget.git /var/lib/mock/v8.3-u-pcoval2-10619-29172/root/chroot_tmpdir/scmroot/wget
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10619-29172/root/chroot_tmpdir/scmroot/wget'...
$ git fetch origin ad4b289eb40c3c276ec7703028419d72b7b04d4d:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/wget
 * [new ref]         ad4b289eb40c3c276ec7703028419d72b7b04d4d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad4b289 bump release for test build