Add automatic KB/LCU download URL fetching in UpdateDependencies

Microsoft.DotNet.Framework.Docker.sln

@@ -0,0 +1,48 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.DotNet.Framework.UpdateDependencies", "eng\update-dependencies\Microsoft.DotNet.Framework.UpdateDependencies.csproj", "{41061718-0920-4131-A70C-F52E46C89E31}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.DotNet.Framework.Docker.Tests", "tests\Microsoft.DotNet.Framework.Docker.Tests\Microsoft.DotNet.Framework.Docker.Tests.csproj", "{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|Any CPU = Release|Any CPU
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{41061718-0920-4131-A70C-F52E46C89E31}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{41061718-0920-4131-A70C-F52E46C89E31}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{41061718-0920-4131-A70C-F52E46C89E31}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{41061718-0920-4131-A70C-F52E46C89E31}.Debug|x64.Build.0 = Debug|Any CPU
+		{41061718-0920-4131-A70C-F52E46C89E31}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{41061718-0920-4131-A70C-F52E46C89E31}.Debug|x86.Build.0 = Debug|Any CPU
+		{41061718-0920-4131-A70C-F52E46C89E31}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{41061718-0920-4131-A70C-F52E46C89E31}.Release|Any CPU.Build.0 = Release|Any CPU
+		{41061718-0920-4131-A70C-F52E46C89E31}.Release|x64.ActiveCfg = Release|Any CPU
+		{41061718-0920-4131-A70C-F52E46C89E31}.Release|x64.Build.0 = Release|Any CPU
+		{41061718-0920-4131-A70C-F52E46C89E31}.Release|x86.ActiveCfg = Release|Any CPU
+		{41061718-0920-4131-A70C-F52E46C89E31}.Release|x86.Build.0 = Release|Any CPU
+		{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}.Debug|x64.Build.0 = Debug|Any CPU
+		{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}.Debug|x86.Build.0 = Debug|Any CPU
+		{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}.Release|Any CPU.Build.0 = Release|Any CPU
+		{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}.Release|x64.ActiveCfg = Release|Any CPU
+		{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}.Release|x64.Build.0 = Release|Any CPU
+		{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}.Release|x86.ActiveCfg = Release|Any CPU
+		{ACB9C5B2-6D27-4487-94A1-6F397AC4D733}.Release|x86.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

eng/update-dependencies/IVariableContext.cs

@@ -0,0 +1,31 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.DotNet.Framework.UpdateDependencies;
+
+/// <summary>
+/// Provides access to a collection of named variables that can be retrieved
+/// and modified. Variables support recursive resolution, allowing one variable
+/// to reference another using the $(variableName) syntax.
+/// </summary>
+internal interface IVariableContext
+{
+    /// <summary>
+    /// Retrieves or updates a variable by name. When retrieving, any embedded
+    /// variable references are resolved recursively. When setting, the
+    /// underlying content is updated to reflect the change.
+    /// </summary>
+    /// <param name="key">
+    /// The name of the variable to access.
+    /// </param>
+    /// <returns>
+    /// The resolved value of the variable, or an empty string if not found.
+    /// </returns>
+    string this[string key] { get; set; }
+
+    /// <summary>
+    /// Enumerates all available variable names in this context.
+    /// </summary>
+    IEnumerable<string> AllVariables { get; }
+}

eng/update-dependencies/IVariableUpdater.cs

@@ -0,0 +1,40 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.DotNet.Framework.UpdateDependencies;
+
+internal interface IVariableUpdater
+{
+    /// <summary>
+    /// Determines whether a variable should be updated based on its name.
+    /// </summary>
+    /// <param name="variableKey">
+    /// The name of the variable being checked for update eligibility.
+    /// </param>
+    /// <param name="variables">
+    /// All variables in the current context, in case the updater needs to
+    /// reference other variables when determining if an update is needed.
+    /// </param>
+    /// <returns>
+    /// True if the variable should be updated.
+    /// </returns>
+    bool ShouldUpdate(string variableKey, IVariableContext variables);
+
+    /// <summary>
+    /// Computes a new value for a variable based on its current name and the
+    /// surrounding context. This method is only called for variables whose
+    /// names match the <see cref="KeyPattern"/>.
+    /// </summary>
+    /// <param name="variableKey">
+    /// The name of the variable being updated.
+    /// </param>
+    /// <param name="variables">
+    /// All variables in the current context. Used to reference other variables
+    /// when generating a new value.
+    /// </param>
+    /// <returns>
+    /// The new value that should be assigned to the variable.
+    /// </returns>
+    Task<string> GetNewValueAsync(string variableKey, IVariableContext variables);
+}