Prebuilt report fix (#15329)

src/SourceBuild/content/eng/tools/tasks/Microsoft.DotNet.SourceBuild.Tasks.XPlat/UsageReport/WriteUsageReports.cs

@@ -195,13 +195,14 @@ namespace Microsoft.DotNet.SourceBuild.Tasks.UsageReport
                     // Get the embedded creation time if possible: the file's original metadata may
                     // have been destroyed by copying, zipping, etc.
                     string creationTime = snapshot.Xml
-                        // Get the second PropertyGroup.
-                        .Elements().Skip(1).FirstOrDefault()
-                        // Get the creation time element.
-                        ?.Element(snapshot.Xml
-                            .GetDefaultNamespace()
-                            .GetName(WritePackageVersionsProps.CreationTimePropertyName))
-                        ?.Value;
+                        // Get all elements
+                        .Elements()
+                        // Select all the subelements
+                        .SelectMany(e => e.Elements())
+                        // Find all that match the creation time property name
+                        .Where(e => e.Name == snapshot.Xml.GetDefaultNamespace().GetName(WritePackageVersionsProps.CreationTimePropertyName))
+                        // There should be only one or zero
+                        .SingleOrDefault()?.Value;
 
                     if (string.IsNullOrEmpty(creationTime))
                     {
@@ -279,7 +280,8 @@ namespace Microsoft.DotNet.SourceBuild.Tasks.UsageReport
             public static PackageVersionPropsElement[] Parse(XElement xml)
             {
                 return xml
-                    // Get the single PropertyGroup
+                    // Get the first PropertyGroup. The second PropertyGroup is 'extra properties', and the third group is the creation time.
+                    // Only select the first because the extra properties are not built packages.
                     .Elements()
                     .First()
                     // Get all *PackageVersion property elements.

src/SourceBuild/content/eng/tools/tasks/Microsoft.DotNet.SourceBuild.Tasks.XPlat/WritePackageVersionProps.cs

@@ -61,13 +61,6 @@ namespace Microsoft.DotNet.Build.Tasks
         [Required]
         public string OutputPath { get; set; }
 
-        /// <summary>
-        /// Adds a second PropertyGroup to the output XML containing a property with the time of
-        /// creation in UTC DateTime Ticks. This can be used to track creation time in situations
-        /// where file metadata isn't reliable or preserved.
-        /// </summary>
-        public bool IncludeCreationTimeProperty { get; set; }
-
         /// <summary>
         /// Properties to add to the build output props, which may not exist as nupkgs.
         /// FOr example, this is used to pass the version of the CLI toolset archives.
@@ -242,12 +235,9 @@ namespace Microsoft.DotNet.Build.Tasks
                 WriteExtraProperties(sw);
                 WriteVersionEntries(sw, additionalAssetElementsToWrite, "additional assets");
 
-                if (IncludeCreationTimeProperty)
-                {
-                    sw.WriteLine(@"  <PropertyGroup>");
-                    sw.WriteLine($@"    <{CreationTimePropertyName}>{DateTime.UtcNow.Ticks}</{CreationTimePropertyName}>");
-                    sw.WriteLine(@"  </PropertyGroup>");
-                }
+                sw.WriteLine(@"  <PropertyGroup>");
+                sw.WriteLine($@"    <{CreationTimePropertyName}>{DateTime.UtcNow.Ticks}</{CreationTimePropertyName}>");
+                sw.WriteLine(@"  </PropertyGroup>");
 
                 sw.WriteLine(@"</Project>");
             }

src/SourceBuild/content/repo-projects/Directory.Build.targets

@@ -602,7 +602,7 @@
           Outputs="$(RepoCompletedSemaphorePath)WritePrebuiltUsageData.complete">
     <!-- Save the PVP snapshot of each build step to be evaluated while building the report. -->
     <ItemGroup>
-      <PackageVersionPropsSnapshotFiles Include="$(IntermediatePath)PackageVersions.props.pre.*.xml" />
+      <PackageVersionPropsSnapshotFiles Include="$(IntermediatePath)PackageVersions.*.Current.props" />
     </ItemGroup>
     <Copy SourceFiles="@(PackageVersionPropsSnapshotFiles)" DestinationFolder="$(PackageReportDir)snapshots/" />
 
@@ -688,7 +688,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageVersionPropsSavedSnapshotFiles Include="$(PackageReportDir)snapshots/PackageVersions.props.pre.*.xml" />
+      <PackageVersionPropsSavedSnapshotFiles Include="$(PackageReportDir)snapshots/PackageVersions.*.Current.props" />
     </ItemGroup>
 
     <WriteUsageReports DataFile="$(PackageReportDataFile)"