Improve the performance of the formatter instability check job

.github/workflows/ci.yaml

@@ -563,12 +563,12 @@ jobs:
         run: rustup show
       - name: "Cache rust"
         uses: Swatinem/rust-cache@v2
-      - name: "Formatter progress"
+      - name: "Run checks"
         run: scripts/formatter_ecosystem_checks.sh
       - name: "Github step summary"
-        run: cat target/progress_projects_stats.txt > $GITHUB_STEP_SUMMARY
+        run: cat target/formatter-ecosystem/stats.txt > $GITHUB_STEP_SUMMARY
       - name: "Remove checkouts from cache"
-        run: rm -r target/progress_projects
+        run: rm -r target/formatter-ecosystem
 
   check-ruff-lsp:
     name: "test ruff-lsp"

scripts/formatter_ecosystem_checks.sh

@@ -8,7 +8,7 @@
 # errors.
 #
 # This script will first clone a diverse set of (mostly) black formatted
-# repositories with fixed revisions to target/progress_projects. Each project
+# repositories with fixed revisions to target/formatter-ecosystem. Each project
 # gets formatted (without modifying the files on disk) to check how
 # similar our style is to black. It also catches common issues such as
 # unstable formatting, internal formatter errors and printing invalid syntax.
@@ -18,72 +18,103 @@
 set -e
 
 target=$(git rev-parse --show-toplevel)/target
-dir="$target/progress_projects"
+dir="$target/formatter-ecosystem"
 mkdir -p "$dir"
 
+# Perform an idempotent clone and checkout of a commit
+clone_commit() {
+    local repo="$1"
+    local name="$2"
+    local ref="$3"
+
+    if [ -z "$repo" ] || [ -z "$name" ] || [ -z "$ref" ]; then
+        echo "Usage: clone_commit <repo> <name> <ref>"
+        return 1
+    fi
+
+    local target="$dir/projects/$name"
+
+    if [ ! -d "$target/.git" ]; then
+        echo "Cloning $repo to $name"
+        # Perform a minimal clone, we only need a single commit
+        git clone --filter=blob:none --depth=1 --no-tags --no-checkout --single-branch "$repo" "$target"
+    fi
+
+    echo "Using $repo at $ref"
+    git -C "$target" fetch --filter=blob:none --depth=1 --no-tags origin "$ref"
+    git -C "$target" checkout -q "$ref"
+}
+
 # small util library
-if [ ! -d "$dir/twine/.git" ]; then
-  git clone --filter=tree:0 https://github.com/pypa/twine "$dir/twine"
-fi
-git -C "$dir/twine" checkout -q ae71822a3cb0478d0f6a0cccb65d6f8e6275ece5
+clone_commit \
+    "https://github.com/pypa/twine" \
+    "twine" \
+    "ae71822a3cb0478d0f6a0cccb65d6f8e6275ece5" &
 
 # web framework that implements a lot of magic
-if [ ! -d "$dir/django/.git" ]; then
-  git clone --filter=tree:0 https://github.com/django/django "$dir/django"
-fi
-git -C "$dir/django" checkout -q ee5147cfd7de2add74a285537a8968ec074e70cd
+clone_commit \
+    "https://github.com/django/django" \
+    "django" \
+    "ee5147cfd7de2add74a285537a8968ec074e70cd" &
 
 # an ML project
-if [ ! -d "$dir/transformers/.git" ]; then
-  git clone --filter=tree:0 https://github.com/huggingface/transformers "$dir/transformers"
-fi
-git -C "$dir/transformers" checkout -q ac5a0556f14dec503b064d5802da1092e0b558ea
+clone_commit \
+    "https://github.com/huggingface/transformers" \
+    "transformers" \
+    "ac5a0556f14dec503b064d5802da1092e0b558ea" &
 
 # type annotations
-if [ ! -d "$dir/typeshed/.git" ]; then
-  git clone --filter=tree:0 https://github.com/python/typeshed "$dir/typeshed"
-fi
-git -C "$dir/typeshed" checkout -q d34ef50754de993d01630883dbcd1d27ba507143
+clone_commit \
+    "https://github.com/python/typeshed" \
+    "typeshed" \
+    "d34ef50754de993d01630883dbcd1d27ba507143" &
 
 # python 3.11, typing and 100% test coverage
-if [ ! -d "$dir/warehouse/.git" ]; then
-  git clone --filter=tree:0 https://github.com/pypi/warehouse "$dir/warehouse"
-fi
-git -C "$dir/warehouse" checkout -q 5a4d2cadec641b5d6a6847d0127940e0f532f184
+clone_commit \
+    "https://github.com/pypi/warehouse" \
+    "warehouse" \
+    "5a4d2cadec641b5d6a6847d0127940e0f532f184" &
 
 # zulip, a django user
-if [ ! -d "$dir/zulip/.git" ]; then
-  git clone --filter=tree:0 https://github.com/zulip/zulip "$dir/zulip"
-fi
-git -C "$dir/zulip" checkout -q ccddbba7a3074283ccaac3bde35fd32b19faf042
+clone_commit \
+    "https://github.com/zulip/zulip" \
+    "zulip" \
+    "ccddbba7a3074283ccaac3bde35fd32b19faf042" &
 
 # home-assistant, home automation with 1ok files
-if [ ! -d "$dir/home-assistant/.git" ]; then
-  git clone --filter=tree:0 https://github.com/home-assistant/core "$dir/home-assistant"
-fi
-git -C "$dir/home-assistant" checkout -q 3601c531f400255d10b82529549e564fbe483a54
+clone_commit \
+    "https://github.com/home-assistant/core" \
+    "home-assistant" \
+    "3601c531f400255d10b82529549e564fbe483a54" &
 
 # poetry, a package manager that uses black preview style
-if [ ! -d "$dir/poetry/.git" ]; then
-  git clone --filter=tree:0 https://github.com/python-poetry/poetry "$dir/poetry"
-fi
-git -C "$dir/poetry" checkout -q 36fedb59b8e655252168055b536ead591068e1e4
+clone_commit \
+    "https://github.com/python-poetry/poetry" \
+    "poetry" \
+    "36fedb59b8e655252168055b536ead591068e1e4" &
 
 # cpython itself
-if [ ! -d "$dir/cpython/.git" ]; then
-  git clone --filter=tree:0 https://github.com/python/cpython "$dir/cpython"
-fi
-git -C "$dir/cpython" checkout -q 28aea5d07d163105b42acd81c1651397ef95ea57
+clone_commit \
+    "https://github.com/python/cpython" \
+    "cpython" \
+    "28aea5d07d163105b42acd81c1651397ef95ea57" &
+
+# wait for the concurrent clones to complete
+wait
 
 # Uncomment if you want to update the hashes
 #for i in "$dir"/*/; do git -C "$i" switch main && git -C "$i" pull; done
 #for i in "$dir"/*/; do echo "# $(basename "$i") $(git -C "$i" rev-parse HEAD)"; done
 
 time cargo run --bin ruff_dev -- format-dev --stability-check \
-  --error-file "$target/progress_projects_errors.txt" --log-file "$target/progress_projects_log.txt" --stats-file "$target/progress_projects_stats.txt" \
-  --files-with-errors 3 --multi-project "$dir" || (
+  --error-file "$dir/errors.txt" \
+  --log-file "$dir/log.txt" \
+  --stats-file "$dir/stats.txt" \
+  --files-with-errors 3 --multi-project "$dir/projects" \
+|| (
   echo "Ecosystem check failed"
-  cat "$target/progress_projects_log.txt"
+  cat "$dir/log.txt"
   exit 1
 )
-cat "$target/progress_projects_stats.txt"
+
+cat "$dir/stats.txt"