$ git clone -n https://src.fedoraproject.org/rpms/xrootd-s3-http.git /var/lib/mock/f45-build-39113-732/root/chroot_tmpdir/scmroot/xrootd-s3-http
Cloning into '/var/lib/mock/f45-build-39113-732/root/chroot_tmpdir/scmroot/xrootd-s3-http'...
$ git fetch origin 9b748534f63cfc820d07968274c4595e5150988f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xrootd-s3-http
 * [new ref]         9b748534f63cfc820d07968274c4595e5150988f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b74853 Update to version 0.6.9