$ git clone -n https://src.fedoraproject.org/rpms/sparrow.git /var/lib/mock/f45-build-109076-17222/root/chroot_tmpdir/scmroot/sparrow
Cloning into '/var/lib/mock/f45-build-109076-17222/root/chroot_tmpdir/scmroot/sparrow'...
$ git fetch origin 9d1ee95d20dcf3a2ba3df72ea0f225c1c6e09a09:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sparrow
 * [new ref]         9d1ee95d20dcf3a2ba3df72ea0f225c1c6e09a09 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9d1ee95 Upstream release