Workflow for cargo bloat (#462)

* adds cargo bloat workflow

* uses notice instead

* warning for bigger sizes, ignore equal sizes

* DO NOT MERGE, TEST COMMIT

* reverted test commit

.github/workflows/bloat_formatter.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+# Copyright 2022 Google LLC
+#
+# Licensed 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.
+
+cd "$(dirname "$0")"
+
+# New output file is $1
+# Old output file is $2
+TMP=comment.md
+WARNING="Note: numbers above are a result of guesswork. They are not 100% correct and never will be."
+NEW_SIZE=$(cat "$1" | sed -nr 's/.*100.0% (.*)KiB .text.*/\1/p')
+OLD_SIZE=$(cat "$2" | sed -nr 's/.*100.0% (.*)KiB .text.*/\1/p')
+
+echo "
+OLD $OLD_SIZE kiB
+NEW $NEW_SIZE kiB" > "$TMP"
+
+echo "
+Output of cargo bloat
+======================
+" >> "$TMP"
+
+echo "Including PR" >> "$TMP"
+cat "$1" >> "$TMP"
+echo "Base branch" >> "$TMP"
+cat "$2" >> "$TMP"
+
+COMMENT="$(cat $TMP | sed "s/$WARNING//g" | sed 's/%/%25/g' | sed -z 's/\n/%0A/g')"
+# No output for equality is intentional.
+if (( $(echo "$NEW_SIZE > $OLD_SIZE" | bc -l) )); then
+  echo "::warning file=.github/workflows/cargo_bloat.yml,title=Binary size::$COMMENT"
+fi
+if (( $(echo "$NEW_SIZE < $OLD_SIZE" | bc -l) )); then
+  echo "::notice file=.github/workflows/cargo_bloat.yml,title=Binary size::$COMMENT"
+fi

.github/workflows/cargo_bloat.yml

@@ -0,0 +1,47 @@
+name: Binary size report
+on: pull_request
+
+jobs:
+  cargo_bloat:
+    runs-on: ubuntu-latest
+    steps:
+      # Setup
+      - uses: actions/setup-python@v1
+        with:
+          python-version: 3.7
+      - name: Install Python dependencies
+        run: python -m pip install --upgrade pip setuptools wheel
+      - uses: actions-rs/cargo@v1
+        with:
+          command: install
+          args: cargo-bloat
+
+      # First run: PR
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+      - name: Install Rust toolchain
+        run: rustup show
+      - name: Set up OpenSK
+        run: ./setup.sh
+      - name: Run bloat on the PR
+        run: RUSTFLAGS="-C link-arg=-icf=all -C force-frame-pointers=no" cargo bloat --release --target=thumbv7em-none-eabi --features=with_ctap1,vendor_hid --crates >> .github/workflows/bloat_output_new.txt
+
+      # Second run: PR
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+          ref: ${{ github.base_ref }}
+          path: OpenSK_base
+      - name: Install old Rust toolchain
+        working-directory: ./OpenSK_base
+        run: rustup show
+      - name: Set up OpenSK
+        working-directory: ./OpenSK_base
+        run: ./setup.sh
+      - name: Run bloat on base
+        working-directory: ./OpenSK_base
+        run: RUSTFLAGS="-C link-arg=-icf=all -C force-frame-pointers=no" cargo bloat --release --target=thumbv7em-none-eabi --features=with_ctap1,vendor_hid --crates >> "$GITHUB_WORKSPACE/.github/workflows/bloat_output_old.txt"
+
+      - name: Run output formatter to echo workflow command
+        run: ./.github/workflows/bloat_formatter.sh bloat_output_new.txt bloat_output_old.txt bloat_comment.md