$ git clone -n https://src.fedoraproject.org/rpms/xapps.git /var/lib/mock/f45-build-38603-725/root/chroot_tmpdir/scmroot/xapps
Cloning into '/var/lib/mock/f45-build-38603-725/root/chroot_tmpdir/scmroot/xapps'...
$ git fetch origin ed9d9487f9d4a9d53d7c5a4da36d670202de6c50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xapps
 * [new ref]         ed9d9487f9d4a9d53d7c5a4da36d670202de6c50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed9d948 Update to 3.3.4-unstable