ARROW-4189: [Rust] Added coverage report.

.github/workflows/rust_cron.yml

@@ -0,0 +1,56 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+name: Rust Cron
+
+on:
+  push:
+    paths:
+      - '.github/workflows/rust_cron.yml'
+  pull_request:
+    paths:
+      - '.github/workflows/rust_cron.yml'
+  schedule:
+    - cron: 0 */12 * * *
+
+jobs:
+  coverage:
+    name: AMD64 Debian 10 Rust ${{ matrix.rust }} Coverage
+    runs-on: ubuntu-latest
+    if: ${{ !contains(github.event.pull_request.title, 'WIP') && github.repository == 'apache/arrow' }}
+    strategy:
+      fail-fast: false
+      matrix:
+        rust: [nightly-2020-04-22]
+    env:
+      RUST: ${{ matrix.rust }}
+    steps:
+      - name: Checkout Arrow
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Fetch Submodules and Tags
+        run: ci/scripts/util_checkout.sh
+      - name: Run coverage
+        shell: bash
+        run: |
+          echo ${RUST} > rust/rust-toolchain &&
+          ci/scripts/rust_coverage.sh `pwd` `pwd`/build $RUST
+      - name: Report coverage
+        continue-on-error: true
+        shell: bash
+        run: bash <(curl -s https://codecov.io/bash)

ci/scripts/rust_coverage.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+set -ex
+
+arrow_dir=${1}
+source_dir=${1}/rust
+build_dir=${2}/rust
+rust=${3}
+
+export ARROW_TEST_DATA=${arrow_dir}/testing/data
+export PARQUET_TEST_DATA=${arrow_dir}/cpp/submodules/parquet-testing/data
+export CARGO_TARGET_DIR=${build_dir}
+
+pushd ${source_dir}
+
+rustup default ${rust}
+rustup component add rustfmt --toolchain ${rust}-x86_64-unknown-linux-gnu
+cargo install cargo-tarpaulin
+
+cargo tarpaulin --out Xml
+
+popd

rust/README.md

@@ -19,6 +19,8 @@
 
 # Native Rust implementation of Apache Arrow
 
+[![Coverage Status](https://codecov.io/gh/apache/arrow/rust/branch/master/graph/badge.svg)](https://codecov.io/gh/apache/arrow?branch=master)
+
 ## The Rust implementation of Arrow consists of the following crates
 
 | Crate     | Description | Documentation |