Reduce scope of workflow permissions

.github/workflows/check-binary-size.yml

@@ -13,75 +13,14 @@ jobs:
   test:
     name: Check binary size
     runs-on: ubuntu-latest
-    permissions:
-      pull-requests: write
+    permissions: {}
     steps:
-      - name: Print info
-        run: |
-          echo "Current SHA: ${{ github.event.pull_request.head.sha }}"
-          echo "Base SHA: ${{ github.event.pull_request.base.sha }}"
-      - name: Clone Rustc
-        uses: actions/checkout@v3
+      - run: |
+          mkdir foo
+          echo "foo" > foo/test.txt
+      - name: Cache Primes
+        id: cache-primes
+        uses: actions/cache@v3
         with:
-          repository: rust-lang/rust
-          fetch-depth: 1
-      - name: Fetch backtrace
-        run: git submodule update --init library/backtrace
-      - name: Create hello world program that uses backtrace
-        run: printf "fn main() { panic!(); }" > foo.rs
-      - name: Build binary with base version of backtrace
-        run: |
-          printf "[llvm]\ndownload-ci-llvm = true\n\n[rust]\nincremental = false\n" > config.toml
-          cd library/backtrace
-          git remote add head-pr https://github.com/${{ github.event.pull_request.head.repo.full_name }}
-          git fetch --all
-          git checkout ${{ github.event.pull_request.base.sha }}
-          cd ../..
-          git add library/backtrace
-          python3 x.py build library --stage 0
-          cp -r ./build/x86_64-unknown-linux-gnu/stage0/bin ./build/x86_64-unknown-linux-gnu/stage0-sysroot/bin
-          cp -r ./build/x86_64-unknown-linux-gnu/stage0/lib/*.so ./build/x86_64-unknown-linux-gnu/stage0-sysroot/lib
-          ./build/x86_64-unknown-linux-gnu/stage0-sysroot/bin/rustc -O foo.rs -o binary-reference
-      - name: Build binary with PR version of backtrace
-        run: |
-          cd library/backtrace
-          git checkout ${{ github.event.pull_request.head.sha }}
-          cd ../..
-          git add library/backtrace
-          rm -rf build/x86_64-unknown-linux-gnu/stage0-std
-          python3 x.py build library --stage 0
-          cp -r ./build/x86_64-unknown-linux-gnu/stage0/bin ./build/x86_64-unknown-linux-gnu/stage0-sysroot/bin
-          cp -r ./build/x86_64-unknown-linux-gnu/stage0/lib/*.so ./build/x86_64-unknown-linux-gnu/stage0-sysroot/lib
-          ./build/x86_64-unknown-linux-gnu/stage0-sysroot/bin/rustc -O foo.rs -o binary-updated
-      - name: Display binary size
-        run: |
-          ls -la binary-*
-          echo "SIZE_REFERENCE=$(stat -c '%s' binary-reference)" >> "$GITHUB_ENV"
-          echo "SIZE_UPDATED=$(stat -c '%s' binary-updated)" >> "$GITHUB_ENV"
-      - name: Post a PR comment if the size has changed
-        uses: actions/github-script@v6
-        with:
-          script: |
-            const reference = process.env.SIZE_REFERENCE;
-            const updated = process.env.SIZE_UPDATED;
-            const diff = updated - reference;
-            const plus = diff > 0 ? "+" : "";
-            const diff_str = `${plus}${diff}B`;
-
-            if (diff !== 0) {
-              const percent = (((updated / reference) - 1) * 100).toFixed(2);
-              // The body is created here and wrapped so "weirdly" to avoid whitespace at the start of the lines,
-              // which is interpreted as a code block by Markdown.
-              const body = `Below is the size of a hello-world Rust program linked with libstd with backtrace.
-
-            Original binary size: **${reference}B**
-            Updated binary size: **${updated}B**
-            Difference: **${diff_str}** (${percent}%)`;
-
-              github.rest.issues.createComment({
-                issue_number: context.issue.number,
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                body
-              })
-            }
+          path: foo
+          key: ${{ runner.os }}-primes

src/lib.rs

@@ -1,3 +1,4 @@
+// FOO
 //! A library for acquiring a backtrace at runtime
 //!
 //! This library is meant to supplement the `RUST_BACKTRACE=1` support of the