Add deterministic report support: Cobertura

Documentation/DeterministicBuild.md

@@ -10,6 +10,23 @@ As explained above, to improve the level of security of generated artifacts (for
 
 Finally, thanks to deterministic CI builds (with the `ContinuousIntegrationBuild` property set to `true`) plus signature we can validate artifacts and be sure that the binary was built from specific sources (because there is no hard-coded variable metadata, like paths from different build machines).
 
+# Deterministic report
+
+Coverlet supports also deterministic reports(for now only for cobertura coverage format).  
+If you include `DeterministicReport` parameters for `msbuild` and `collectors` integrations resulting report will be like:
+```xml
+<?xml version="1.0" encoding="utf-8"?>
+<coverage line-rate="0.8571" branch-rate="0.5" version="1.9" timestamp="1612702997" lines-covered="6" lines-valid="7" branches-covered="1" branches-valid="2">
+  <sources />
+  <packages>
+    <package name="MyLibrary" line-rate="0.8571" branch-rate="0.5" complexity="3">
+      <classes>
+        <class name="MyLibrary.Hello" filename="/_/MyLibrary/Hello.cs" line-rate="0.8571" branch-rate="0.5" complexity="3">
+          <methods>
+...
+```
+As you can see we have empty `<sources />` element and the `filename` start with well known deterministic fragment `/_/...`
+
 **Deterministic build is supported without any workaround since version 3.1.100 of .NET Core SDK**
 
 ## Workaround only for .NET Core SDK < 3.1.100

Documentation/MSBuildIntegration.md

@@ -206,3 +206,11 @@ The workaround is to use the .NET Core `dotnet msbuild` command instead of using
 ## SourceLink
 
 Coverlet supports [SourceLink](https://github.com/dotnet/sourcelink) custom debug information contained in PDBs. When you specify the `/p:UseSourceLink=true` property, Coverlet will generate results that contain the URL to the source files in your source control instead of local file paths.
+
+## Deterministic build
+
+Take a look at [documentation](Documentation/DeterministicBuild.md) for further informations.  
+To generate deterministc report the parameter is:
+```
+/p:DeterministicReport=true
+```

Documentation/VSTestIntegration.md

@@ -85,18 +85,19 @@ We're working to fill the gaps.
 
 These are a list of options that are supported by coverlet. These can be specified as datacollector configurations in the runsettings.
 
-| Option                   | Summary                                                                                                                           |
-|:-------------------------|:----------------------------------------------------------------------------------------------------------------------------------|
-| Format                   | Coverage output format. These are either cobertura, json, lcov, opencover or teamcity as well as combinations of these formats.   | 
-| Exclude                  | Exclude from code coverage analysing using filter expressions.                                                                    | 
-| ExcludeByFile            | Ignore specific source files from code coverage.                                                                                  | 
-| Include                  | Explicitly set what to include in code coverage analysis using filter expressions.                                                | 
-| IncludeDirectory         | Explicitly set which directories to include in code coverage analysis.                                                            |
-| SingleHit                | Specifies whether to limit code coverage hit reporting to a single hit for each location.                                         | 
-| UseSourceLink            | Specifies whether to use SourceLink URIs in place of file system paths.                                                           |
-| IncludeTestAssembly      | Include coverage of the test assembly.                                                                                            |
-| SkipAutoProps            | Neither track nor record auto-implemented properties.                                                                             |
-| DoesNotReturnAttribute   | Methods marked with these attributes are known not to return, statements following them will be excluded from coverage            |
+| Option                   | Summary                                                                                                                                                         |
+|:-------------------------|:----------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| Format                   | Coverage output format. These are either cobertura, json, lcov, opencover or teamcity as well as combinations of these formats.                                 | 
+| Exclude                  | Exclude from code coverage analysing using filter expressions.                                                                                                  | 
+| ExcludeByFile            | Ignore specific source files from code coverage.                                                                                                                | 
+| Include                  | Explicitly set what to include in code coverage analysis using filter expressions.                                                                              | 
+| IncludeDirectory         | Explicitly set which directories to include in code coverage analysis.                                                                                          |
+| SingleHit                | Specifies whether to limit code coverage hit reporting to a single hit for each location.                                                                       | 
+| UseSourceLink            | Specifies whether to use SourceLink URIs in place of file system paths.                                                                                         |
+| IncludeTestAssembly      | Include coverage of the test assembly.                                                                                                                          |
+| SkipAutoProps            | Neither track nor record auto-implemented properties.                                                                                                           |
+| DoesNotReturnAttribute   | Methods marked with these attributes are known not to return, statements following them will be excluded from coverage                                          |
+| DeterministicReport      | Generates deterministic report in context of deterministic build. Take a look at [documentation](Documentation/DeterministicBuild.md) for further informations. | 
 
 How to specify these options via runsettings?
 
@@ -117,6 +118,7 @@ How to specify these options via runsettings?
           <UseSourceLink>true</UseSourceLink>
           <IncludeTestAssembly>true</IncludeTestAssembly>
           <SkipAutoProps>true</SkipAutoProps>
+          <DeterministicReport>false</DeterministicReport>
         </Configuration>
       </DataCollector>
     </DataCollectors>

src/coverlet.collector/DataCollection/CoverageManager.cs

@@ -17,9 +17,8 @@ namespace Coverlet.Collector.DataCollection
     internal class CoverageManager
     {
         private readonly Coverage _coverage;
-
-        private ICoverageWrapper _coverageWrapper;
-
+        private readonly ICoverageWrapper _coverageWrapper;
+        private readonly ISourceRootTranslator _sourceRootTranslator;
         public IReporter[] Reporters { get; }
 
         public CoverageManager(CoverletSettings settings, TestPlatformEqtTrace eqtTrace, TestPlatformLogger logger, ICoverageWrapper coverageWrapper,
@@ -49,7 +48,7 @@ public CoverageManager(CoverletSettings settings, IReporter[] reporters, ILogger
             // Store input vars
             Reporters = reporters;
             _coverageWrapper = coverageWrapper;
-
+            _sourceRootTranslator = sourceRootTranslator;
             // Coverage object
             _coverage = _coverageWrapper.CreateCoverage(settings, logger, instrumentationHelper, fileSystem, sourceRootTranslator, cecilSymbolHelper);
         }
@@ -108,7 +107,7 @@ private CoverageResult GetCoverageResult()
         {
             try
             {
-                return Reporters.Select(reporter => (reporter.Report(coverageResult), Path.ChangeExtension(CoverletConstants.DefaultFileName, reporter.Extension)));
+                return Reporters.Select(reporter => (reporter.Report(coverageResult, _sourceRootTranslator), Path.ChangeExtension(CoverletConstants.DefaultFileName, reporter.Extension)));
             }
             catch (Exception ex)
             {

src/coverlet.collector/DataCollection/CoverageWrapper.cs

@@ -17,7 +17,7 @@ internal class CoverageWrapper : ICoverageWrapper
         /// <returns>Coverage object</returns>
         public Coverage CreateCoverage(CoverletSettings settings, ILogger coverletLogger, IInstrumentationHelper instrumentationHelper, IFileSystem fileSystem, ISourceRootTranslator sourceRootTranslator, ICecilSymbolHelper cecilSymbolHelper)
         {
-            CoverageParameters parameters = new CoverageParameters
+            CoverageParameters parameters = new()
             {
                 IncludeFilters = settings.IncludeFilters,
                 IncludeDirectories = settings.IncludeDirectories,
@@ -29,7 +29,8 @@ public Coverage CreateCoverage(CoverletSettings settings, ILogger coverletLogger
                 MergeWith = settings.MergeWith,
                 UseSourceLink = settings.UseSourceLink,
                 SkipAutoProps = settings.SkipAutoProps,
-                DoesNotReturnAttributes = settings.DoesNotReturnAttributes
+                DoesNotReturnAttributes = settings.DoesNotReturnAttributes,
+                DeterministicReport = settings.DeterministicReport
             };
 
             return new Coverage(

src/coverlet.collector/DataCollection/CoverletSettings.cs

@@ -73,6 +73,11 @@ internal class CoverletSettings
         /// </summary>
         public string[] DoesNotReturnAttributes { get; set; }
 
+        /// <summary>
+        /// DeterministicReport flag
+        /// </summary>
+        public bool DeterministicReport { get; set; }
+
         public override string ToString()
         {
             var builder = new StringBuilder();
@@ -89,6 +94,7 @@ public override string ToString()
             builder.AppendFormat("IncludeTestAssembly: '{0}'", IncludeTestAssembly);
             builder.AppendFormat("SkipAutoProps: '{0}'", SkipAutoProps);
             builder.AppendFormat("DoesNotReturnAttributes: '{0}'", string.Join(",", DoesNotReturnAttributes ?? Enumerable.Empty<string>()));
+            builder.AppendFormat("DeterministicReport: '{0}'", DeterministicReport);
 
             return builder.ToString();
         }

src/coverlet.collector/DataCollection/CoverletSettingsParser.cs

@@ -44,6 +44,7 @@ public CoverletSettings Parse(XmlElement configurationElement, IEnumerable<strin
                 coverletSettings.IncludeTestAssembly = ParseIncludeTestAssembly(configurationElement);
                 coverletSettings.SkipAutoProps = ParseSkipAutoProps(configurationElement);
                 coverletSettings.DoesNotReturnAttributes = ParseDoesNotReturnAttributes(configurationElement);
+                coverletSettings.DeterministicReport = ParseDeterministicReport(configurationElement);
             }
 
             coverletSettings.ReportFormats = ParseReportFormats(configurationElement);
@@ -195,6 +196,18 @@ private bool ParseSingleHit(XmlElement configurationElement)
             return singleHit;
         }
 
+        /// <summary>
+        /// Parse ParseDeterministicReport flag
+        /// </summary>
+        /// <param name="configurationElement">Configuration element</param>
+        /// <returns>ParseDeterministicReport flag</returns>
+        private bool ParseDeterministicReport(XmlElement configurationElement)
+        {
+            XmlElement deterministicReportElement = configurationElement[CoverletConstants.DeterministicReport];
+            bool.TryParse(deterministicReportElement?.InnerText, out bool deterministicReport);
+            return deterministicReport;
+        }
+
         /// <summary>
         /// Parse include test assembly flag
         /// </summary>

src/coverlet.collector/Utilities/CoverletConstants.cs

@@ -22,5 +22,6 @@ internal static class CoverletConstants
         public const string InProcDataCollectorName = "CoverletInProcDataCollector";
         public const string SkipAutoProps = "SkipAutoProps";
         public const string DoesNotReturnAttributesElementName = "DoesNotReturnAttribute";
+        public const string DeterministicReport = "DeterministicReport";
     }
 }

src/coverlet.console/Program.cs

@@ -37,9 +37,11 @@ static int Main(string[] args)
             var logger = (ConsoleLogger)serviceProvider.GetService<ILogger>();
             var fileSystem = serviceProvider.GetService<IFileSystem>();
 
-            var app = new CommandLineApplication();
-            app.Name = "coverlet";
-            app.FullName = "Cross platform .NET Core code coverage tool";
+            var app = new CommandLineApplication
+            {
+                Name = "coverlet",
+                FullName = "Cross platform .NET Core code coverage tool"
+            };
             app.HelpOption("-h|--help");
             app.VersionOption("-v|--version", GetAssemblyVersion());
             int exitCode = (int)CommandExitCodes.Success;
@@ -79,7 +81,7 @@ static int Main(string[] args)
                     logger.Level = verbosity.ParsedValue;
                 }
 
-                CoverageParameters parameters = new CoverageParameters
+                CoverageParameters parameters = new()
                 {
                     IncludeFilters = includeFilters.Values.ToArray(),
                     IncludeDirectories = includeDirectories.Values.ToArray(),
@@ -94,16 +96,18 @@ static int Main(string[] args)
                     DoesNotReturnAttributes = doesNotReturnAttributes.Values.ToArray()
                 };
 
-                Coverage coverage = new Coverage(moduleOrAppDirectory.Value,
+                ISourceRootTranslator sourceRootTranslator = serviceProvider.GetRequiredService<ISourceRootTranslator>();
+
+                Coverage coverage = new(moduleOrAppDirectory.Value,
                                                  parameters,
                                                  logger,
                                                  serviceProvider.GetRequiredService<IInstrumentationHelper>(),
                                                  fileSystem,
-                                                 serviceProvider.GetRequiredService<ISourceRootTranslator>(),
+                                                 sourceRootTranslator,
                                                  serviceProvider.GetRequiredService<ICecilSymbolHelper>());
                 coverage.PrepareModules();
 
-                Process process = new Process();
+                Process process = new();
                 process.StartInfo.FileName = target.Value();
                 process.StartInfo.Arguments = targs.HasValue() ? targs.Value() : string.Empty;
                 process.StartInfo.CreateNoWindow = true;
@@ -146,7 +150,7 @@ static int Main(string[] args)
                     Directory.CreateDirectory(directory);
                 }
 
-                foreach (var format in (formats.HasValue() ? formats.Values : new List<string>(new string[] { "json" })))
+                foreach (var format in formats.HasValue() ? formats.Values : new List<string>(new string[] { "json" }))
                 {
                     var reporter = new ReporterFactory(format).CreateReporter();
                     if (reporter == null)
@@ -158,7 +162,7 @@ static int Main(string[] args)
                     {
                         // Output to console
                         logger.LogInformation("  Outputting results to console", important: true);
-                        logger.LogInformation(reporter.Report(result), important: true);
+                        logger.LogInformation(reporter.Report(result, sourceRootTranslator), important: true);
                     }
                     else
                     {
@@ -169,7 +173,7 @@ static int Main(string[] args)
 
                         var report = Path.Combine(directory, filename);
                         logger.LogInformation($"  Generating report '{report}'", important: true);
-                        fileSystem.WriteAllText(report, reporter.Report(result));
+                        fileSystem.WriteAllText(report, reporter.Report(result, sourceRootTranslator));
                     }
                 }
 

src/coverlet.core/Reporters/IReporter.cs → src/coverlet.core/Abstractions/IReporter.cs

@@ -1,11 +1,11 @@
-namespace Coverlet.Core.Reporters
+namespace Coverlet.Core.Abstractions
 {
     internal interface IReporter
     {
         ReporterOutputType OutputType { get; }
         string Format { get; }
         string Extension { get; }
-        string Report(CoverageResult result);
+        string Report(CoverageResult result, ISourceRootTranslator sourceRootTranslator);
     }
 
     internal enum ReporterOutputType

src/coverlet.core/Abstractions/ISourceRootTranslator.cs

@@ -6,6 +6,7 @@ namespace Coverlet.Core.Abstractions
     internal interface ISourceRootTranslator
     {
         string ResolveFilePath(string originalFileName);
+        string ResolveDeterministicPath(string originalFileName);
         IReadOnlyList<SourceRootMapping> ResolvePathRoot(string pathRoot);
     }
 }