ci: harden workflow action input handling

.github/actions/setup-node-env/action.yml

@@ -37,7 +37,7 @@ runs:
         exit 1
 
     - name: Setup Node.js
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
       with:
         node-version: ${{ inputs.node-version }}
         check-latest: true
@@ -70,14 +70,29 @@ runs:
       shell: bash
       env:
         CI: "true"
+        FROZEN_LOCKFILE: ${{ inputs.frozen-lockfile }}
       run: |
+        set -euo pipefail
         export PATH="$NODE_BIN:$PATH"
         which node
         node -v
         pnpm -v
-        LOCKFILE_FLAG=""
-        if [ "${{ inputs.frozen-lockfile }}" = "true" ]; then
-          LOCKFILE_FLAG="--frozen-lockfile"
+        case "$FROZEN_LOCKFILE" in
+          true) LOCKFILE_FLAG="--frozen-lockfile" ;;
+          false) LOCKFILE_FLAG="" ;;
+          *)
+            echo "::error::Invalid frozen-lockfile input: '$FROZEN_LOCKFILE' (expected true or false)"
+            exit 2
+            ;;
+        esac
+
+        install_args=(
+          install
+          --ignore-scripts=false
+          --config.engine-strict=false
+          --config.enable-pre-post-scripts=true
+        )
+        if [ -n "$LOCKFILE_FLAG" ]; then
+          install_args+=("$LOCKFILE_FLAG")
         fi
-        pnpm install $LOCKFILE_FLAG --ignore-scripts=false --config.engine-strict=false --config.enable-pre-post-scripts=true || \
-        pnpm install $LOCKFILE_FLAG --ignore-scripts=false --config.engine-strict=false --config.enable-pre-post-scripts=true
+        pnpm "${install_args[@]}" || pnpm "${install_args[@]}"

.github/actions/setup-pnpm-store-cache/action.yml

@@ -14,11 +14,17 @@ runs:
   steps:
     - name: Setup pnpm (corepack retry)
       shell: bash
+      env:
+        PNPM_VERSION: ${{ inputs.pnpm-version }}
       run: |
         set -euo pipefail
+        if [[ ! "$PNPM_VERSION" =~ ^[0-9]+(\.[0-9]+){1,2}([.-][0-9A-Za-z.-]+)?$ ]]; then
+          echo "::error::Invalid pnpm-version input: '$PNPM_VERSION'"
+          exit 2
+        fi
         corepack enable
         for attempt in 1 2 3; do
-          if corepack prepare "pnpm@${{ inputs.pnpm-version }}" --activate; then
+          if corepack prepare "pnpm@$PNPM_VERSION" --activate; then
             pnpm -v
             exit 0
           fi

.github/workflows/ci.yml

@@ -368,7 +368,7 @@ jobs:
           test -s dist/plugin-sdk/index.js
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: 22.x
           check-latest: true

.github/workflows/install-smoke.yml

@@ -34,7 +34,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: 22.x
           check-latest: true

.github/workflows/workflow-sanity.yml

@@ -40,3 +40,24 @@ jobs:
               print(f"- {path}")
             sys.exit(1)
           PY
+
+  actionlint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install actionlint
+        shell: bash
+        run: |
+          set -euo pipefail
+          ACTIONLINT_VERSION="1.7.11"
+          archive="actionlint_${ACTIONLINT_VERSION}_linux_amd64.tar.gz"
+          curl -sSfL "https://github.com/rhysd/actionlint/releases/download/v${ACTIONLINT_VERSION}/${archive}" | tar -xz actionlint
+          sudo mv actionlint /usr/local/bin/actionlint
+
+      - name: Lint workflows
+        run: actionlint
+
+      - name: Disallow direct inputs interpolation in composite run blocks
+        run: python3 scripts/check-composite-action-input-interpolation.py

scripts/check-composite-action-input-interpolation.py

@@ -0,0 +1,81 @@
+#!/usr/bin/env python3
+from __future__ import annotations
+
+import pathlib
+import re
+import sys
+
+
+INPUT_INTERPOLATION_RE = re.compile(r"\$\{\{\s*inputs\.")
+RUN_LINE_RE = re.compile(r"^(\s*)run:\s*(.*)$")
+USING_COMPOSITE_RE = re.compile(r"^\s*using:\s*composite\s*$", re.MULTILINE)
+
+
+def indentation(line: str) -> int:
+    return len(line) - len(line.lstrip(" "))
+
+
+def scan_file(path: pathlib.Path) -> list[tuple[int, str]]:
+    text = path.read_text(encoding="utf-8")
+    if not USING_COMPOSITE_RE.search(text):
+        return []
+
+    lines = text.splitlines()
+    violations: list[tuple[int, str]] = []
+    line_count = len(lines)
+    index = 0
+
+    while index < line_count:
+        line = lines[index]
+        match = RUN_LINE_RE.match(line)
+        if not match:
+            index += 1
+            continue
+
+        run_indent = len(match.group(1))
+        run_value = match.group(2).strip()
+        line_no = index + 1
+
+        if run_value and run_value[0] not in ("|", ">"):
+            if INPUT_INTERPOLATION_RE.search(run_value):
+                violations.append((line_no, line.strip()))
+            index += 1
+            continue
+
+        index += 1
+        while index < line_count:
+            script_line = lines[index]
+            if script_line.strip() == "":
+                index += 1
+                continue
+            if indentation(script_line) <= run_indent:
+                break
+            if INPUT_INTERPOLATION_RE.search(script_line):
+                violations.append((index + 1, script_line.strip()))
+            index += 1
+
+    return violations
+
+
+def main() -> int:
+    root = pathlib.Path(".github/actions")
+    files = sorted(root.rglob("action.y*ml"))
+    all_violations: list[tuple[pathlib.Path, int, str]] = []
+
+    for file_path in files:
+        for line_no, line in scan_file(file_path):
+            all_violations.append((file_path, line_no, line))
+
+    if all_violations:
+        print("Disallowed direct inputs interpolation in composite run blocks:")
+        for file_path, line_no, line in all_violations:
+            print(f"- {file_path}:{line_no}: {line}")
+        print("Use env: and reference shell variables instead.")
+        return 1
+
+    print("No direct inputs interpolation found in composite run blocks.")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())