C#: Change random temp folder names to hash values

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/NugetPackageRestorer.cs

@@ -44,9 +44,9 @@ public NugetPackageRestorer(
             this.logger = logger;
             this.compilationInfoContainer = compilationInfoContainer;
 
-            PackageDirectory = new TemporaryDirectory(ComputeTempDirectoryPath(fileProvider.SourceDir.FullName, "packages"), "package", logger);
-            legacyPackageDirectory = new TemporaryDirectory(ComputeTempDirectoryPath(fileProvider.SourceDir.FullName, "legacypackages"), "legacy package", logger);
-            missingPackageDirectory = new TemporaryDirectory(ComputeTempDirectoryPath(fileProvider.SourceDir.FullName, "missingpackages"), "missing package", logger);
+            PackageDirectory = new TemporaryDirectory(ComputeTempDirectoryPath("packages"), "package", logger);
+            legacyPackageDirectory = new TemporaryDirectory(ComputeTempDirectoryPath("legacypackages"), "legacy package", logger);
+            missingPackageDirectory = new TemporaryDirectory(ComputeTempDirectoryPath("missingpackages"), "missing package", logger);
         }
 
         public string? TryRestore(string package)
@@ -338,7 +338,7 @@ private void RestoreProjects(IEnumerable<string> projects, out ConcurrentBag<Dep
             }
 
             logger.LogInfo($"Found {notYetDownloadedPackages.Count} packages that are not yet restored");
-            using var tempDir = new TemporaryDirectory(ComputeTempDirectoryPath(fileProvider.SourceDir.FullName, "nugetconfig"), "generated nuget config", logger);
+            using var tempDir = new TemporaryDirectory(ComputeTempDirectoryPath("nugetconfig"), "generated nuget config", logger);
             var nugetConfig = fallbackNugetFeeds is null
                 ? GetNugetConfig()
                 : CreateFallbackNugetConfig(fallbackNugetFeeds, tempDir.DirInfo.FullName);
@@ -771,19 +771,19 @@ public void Dispose()
         }
 
         /// <summary>
-        /// Computes a unique temp directory for the packages associated
-        /// with this source tree. Use a SHA1 of the directory name.
+        /// Returns the full path to a temporary directory with the given subfolder name.
         /// </summary>
-        /// <returns>The full path of the temp directory.</returns>
-        private static string ComputeTempDirectoryPath(string srcDir, string subfolderName)
+        private static string ComputeTempDirectoryPath(string subfolderName)
         {
-            var bytes = Encoding.Unicode.GetBytes(srcDir);
-            var sha = SHA1.HashData(bytes);
-            var sb = new StringBuilder();
-            foreach (var b in sha.Take(8))
-                sb.AppendFormat("{0:x2}", b);
+            return Path.Combine(FileUtils.GetTemporaryWorkingDirectory(out _), subfolderName);
+        }
 
-            return Path.Combine(FileUtils.GetTemporaryWorkingDirectory(out _), sb.ToString(), subfolderName);
+        /// <summary>
+        /// Computes a unique temporary directory path based on the source directory and the subfolder name.
+        /// </summary>
+        private static string ComputeTempDirectoryPath(string srcDir, string subfolderName)
+        {
+            return Path.Combine(FileUtils.GetTemporaryWorkingDirectory(out _), FileUtils.ComputeHash(srcDir), subfolderName);
         }
     }
 }

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/SourceGenerators/DotnetSourceGeneratorBase.cs

@@ -83,7 +83,7 @@ protected override IEnumerable<string> Run()
                 var targetDir = GetTemporaryWorkingDirectory(FileType.ToLowerInvariant());
 
                 return groupedFiles
-                    .SelectMany(group => sourceGenerator.RunSourceGenerator(group.Value, group.Key, references, targetDir));
+                    .SelectMany(group => sourceGenerator.RunSourceGenerator(group.Value, group.Key, references, targetDir, fileProvider.SourceDir.FullName));
             }
             catch (Exception ex)
             {

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/SourceGenerators/DotnetSourceGeneratorWrapper/DotnetSourceGeneratorWrapper.cs

@@ -33,11 +33,12 @@ public DotnetSourceGeneratorWrapper(
 
         protected abstract void GenerateAnalyzerConfig(IEnumerable<string> additionalFiles, string csprojFile, string analyzerConfigPath);
 
-        public IEnumerable<string> RunSourceGenerator(IEnumerable<string> additionalFiles, string csprojFile, IEnumerable<string> references, string targetDir)
+        public IEnumerable<string> RunSourceGenerator(IEnumerable<string> additionalFiles, string csprojFile, IEnumerable<string> references, string targetDir, string sourceDir)
         {
             try
             {
-                var name = Guid.NewGuid().ToString("N").ToUpper();
+                var relativePathToCsProj = Path.GetRelativePath(sourceDir, csprojFile);
+                var name = FileUtils.ComputeHash($"{relativePathToCsProj}\n{this.GetType().Name}");
                 using var tempDir = new TemporaryDirectory(Path.Join(FileUtils.GetTemporaryWorkingDirectory(out _), "source-generator"), "source generator temporary", logger);
                 var analyzerConfigPath = Path.Combine(tempDir.DirInfo.FullName, $"{name}.txt");
                 var dllPath = Path.Combine(tempDir.DirInfo.FullName, $"{name}.dll");

csharp/extractor/Semmle.Util/FileUtils.cs

@@ -86,16 +86,32 @@ public static void TryDelete(string file)
         }
 
         /// <summary>
-        /// Computes the hash of <paramref name="filePath"/>.
+        /// Computes the hash of the file at <paramref name="filePath"/>.
         /// </summary>
         public static string ComputeFileHash(string filePath)
         {
             using var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
-            using var shaAlg = SHA256.Create();
-            var sha = shaAlg.ComputeHash(fileStream);
+            var sha = SHA256.HashData(fileStream);
+            return GetHashString(sha);
+        }
+
+        /// <summary>
+        /// Computes the hash of <paramref name="input"/>.
+        /// </summary>
+        public static string ComputeHash(string input)
+        {
+            var bytes = Encoding.Unicode.GetBytes(input);
+            var sha = MD5.HashData(bytes); // MD5 to keep it shorter than SHA256
+            return GetHashString(sha).ToUpper();
+        }
+
+        private static string GetHashString(byte[] sha)
+        {
             var hex = new StringBuilder(sha.Length * 2);
             foreach (var b in sha)
+            {
                 hex.AppendFormat("{0:x2}", b);
+            }
             return hex.ToString();
         }
 

csharp/ql/integration-tests/all-platforms/cshtml_standalone/Files.expected

@@ -1,4 +1,4 @@
 | Program.cs |
 | Views/Home/Index.cshtml |
-| _ql_csharp_ql_integration_tests_all_platforms_cshtml_standalone_test_test_Views_Home_Index_cshtml.g.cs |
 | test-db/working/implicitUsings/GlobalUsings.g.cs |
+| test-db/working/razor/EC52D77FE9BF67AD10C5C3F248392316/Microsoft.CodeAnalysis.Razor.Compiler/Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator/[...]_ql_csharp_ql_integration_tests_all_platforms_cshtml_standalone_test_test_Views_Home_Index_cshtml.g.cs |

csharp/ql/integration-tests/all-platforms/cshtml_standalone/Files.ql

@@ -4,11 +4,15 @@ private string getPath(File f) {
   result = f.getRelativePath() and
   not exists(result.indexOf("_ql_csharp_ql_integration_tests_all_platforms_cshtml_standalone_"))
   or
-  exists(int index |
-    index =
+  exists(int index1, int index2, string pattern |
+    pattern = "Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator" and
+    index1 = f.getRelativePath().indexOf(pattern) and
+    index2 =
       f.getRelativePath()
           .indexOf("_ql_csharp_ql_integration_tests_all_platforms_cshtml_standalone_") and
-    result = f.getRelativePath().substring(index, f.getRelativePath().length())
+    result =
+      f.getRelativePath().substring(0, index1 + pattern.length()) + "/[...]" +
+        f.getRelativePath().substring(index2, f.getRelativePath().length())
   )
 }
 

csharp/ql/integration-tests/all-platforms/cshtml_standalone_disabled/Files.expected

@@ -1,2 +1,2 @@
-| Program.cs |
-| test-db/working/implicitUsings/GlobalUsings.g.cs |
+| Program.cs:0:0:0:0 | Program.cs |
+| test-db/working/implicitUsings/GlobalUsings.g.cs:0:0:0:0 | test-db/working/implicitUsings/GlobalUsings.g.cs |

csharp/ql/integration-tests/all-platforms/cshtml_standalone_disabled/Files.ql

@@ -1,20 +1,5 @@
 import csharp
 
-private string getPath(File f) {
-  result = f.getRelativePath() and
-  not exists(
-    result
-        .indexOf("_semmle_code_target_codeql_csharp_integration_tests_ql_csharp_ql_integration_tests_all_platforms_cshtml_standalone_")
-  )
-  or
-  exists(int index |
-    index =
-      f.getRelativePath()
-          .indexOf("_semmle_code_target_codeql_csharp_integration_tests_ql_csharp_ql_integration_tests_all_platforms_cshtml_standalone_") and
-    result = f.getRelativePath().substring(index, f.getRelativePath().length())
-  )
-}
-
 from File f
 where f.fromSource() or f.getExtension() = "cshtml"
-select getPath(f)
+select f

csharp/ql/integration-tests/all-platforms/cshtml_standalone_net6/Files.expected

@@ -1,4 +1,4 @@
 | Program.cs |
 | Views/Home/Index.cshtml |
-| _ql_csharp_ql_integration_tests_all_platforms_cshtml_standalone_net6_test_test_Views_Home_Index_cshtml.g.cs |
 | test-db/working/implicitUsings/GlobalUsings.g.cs |
+| test-db/working/razor/EC52D77FE9BF67AD10C5C3F248392316/[...]/Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator/[...]_ql_csharp_ql_integration_tests_all_platforms_cshtml_standalone_net6_test_test_Views_Home_Index_cshtml.g.cs |

csharp/ql/integration-tests/all-platforms/cshtml_standalone_net6/Files.ql

@@ -4,11 +4,19 @@ private string getPath(File f) {
   result = f.getRelativePath() and
   not exists(result.indexOf("_ql_csharp_ql_integration_tests_all_platforms_cshtml_standalone_"))
   or
-  exists(int index |
-    index =
+  exists(int index0, int index1, int index2, string pattern0, string pattern1 |
+    // TODO: Remove index0 and pattern0. Currently there's some instability in the path depending on which dotnet SDK is being used. (See issue #448)
+    pattern0 = "EC52D77FE9BF67AD10C5C3F248392316" and
+    index0 = f.getRelativePath().indexOf(pattern0) and
+    pattern1 = "Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator" and
+    index1 = f.getRelativePath().indexOf(pattern1) and
+    index2 =
       f.getRelativePath()
           .indexOf("_ql_csharp_ql_integration_tests_all_platforms_cshtml_standalone_") and
-    result = f.getRelativePath().substring(index, f.getRelativePath().length())
+    result =
+      f.getRelativePath().substring(0, index0 + pattern0.length()) + "/[...]/" +
+        f.getRelativePath().substring(index1, index1 + pattern1.length()) + "/[...]" +
+        f.getRelativePath().substring(index2, f.getRelativePath().length())
   )
 }