Verify and retry Windows CI choco installs

The Chocolatey CDN can return transient errors (e.g. 504 Gateway
Timeout) for individual packages, causing the install step to partially
succeed without failing the CI job. This leads to confusing build
failures later (e.g. winfsp-sys panic: "WinFsp installation directory
not found"). Add a step that verifies all required packages are present
and retries installing any missing ones.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: J Robert Ray <jrray@jrray.org>

Author: jrray

.github/workflows/rust.yml

@@ -23,6 +23,56 @@ jobs:
         uses: crazy-max/ghaction-chocolatey@v3
         with:
           args: install protoc llvm winfsp make
+      - name: Verify Chocolatey packages and retry if needed
+        # The chocolatey install step can partially succeed: if the
+        # Chocolatey CDN returns a transient error (e.g. 504 Gateway
+        # Timeout) for one package, other packages may still install
+        # fine and the step exits successfully. This leaves the build
+        # missing critical dependencies, causing confusing failures
+        # later (e.g. winfsp-sys build.rs panic). This step verifies
+        # that all required packages are actually present and retries
+        # any that are missing.
+        shell: pwsh
+        run: |
+          function Test-Packages {
+            $missing = @()
+            if (-not (Test-Path "C:\Program Files (x86)\WinFsp")) {
+              $missing += "winfsp"
+            }
+            if (-not (Get-Command protoc -ErrorAction SilentlyContinue)) {
+              $missing += "protoc"
+            }
+            if (-not (Get-Command make -ErrorAction SilentlyContinue)) {
+              $missing += "make"
+            }
+            if (-not (Get-Command clang -ErrorAction SilentlyContinue)) {
+              $missing += "llvm"
+            }
+            return $missing
+          }
+
+          $missing = Test-Packages
+          if ($missing.Count -eq 0) {
+            Write-Host "All required packages verified successfully."
+            exit 0
+          }
+
+          $maxRetries = 2
+          for ($attempt = 1; $attempt -le $maxRetries; $attempt++) {
+            Write-Host "::warning::Missing packages: $($missing -join ', '). Retry attempt $attempt of $maxRetries..."
+            Start-Sleep -Seconds 15
+            choco install $missing -y --allow-unofficial
+            $missing = Test-Packages
+            if ($missing.Count -eq 0) {
+              Write-Host "All required packages verified successfully after retry."
+              exit 0
+            }
+          }
+
+          foreach ($pkg in $missing) {
+            Write-Host "::error::Required package not installed after retries: $pkg"
+          }
+          exit 1
       - name: Install FlatBuffers Compiler
         run: |
           $url = "https://github.com/google/flatbuffers/releases/download/v23.5.26/Windows.flatc.binary.zip"