$ git clone -n https://src.fedoraproject.org/rpms/rust-tiny-dfr.git /var/lib/mock/f39-build-1972048-43325/root/chroot_tmpdir/scmroot/rust-tiny-dfr
Cloning into '/var/lib/mock/f39-build-1972048-43325/root/chroot_tmpdir/scmroot/rust-tiny-dfr'...
$ git fetch origin 860d6fd5d1c8c98999dc0e75d69c2345653293c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tiny-dfr
 * [new ref]         860d6fd5d1c8c98999dc0e75d69c2345653293c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 860d6fd Drop downstream patch to use librsvg pre-release version