(build) improve build time for multi-stage

Author: arturcic

build.cake

@@ -45,8 +45,8 @@ bool singleStageRun = true;
 
 Setup<BuildParameters>(context =>
 {
+    EnsureDirectoryExists("artifacts");
     var parameters = BuildParameters.GetParameters(context);
-    Build(parameters.Configuration);
     var gitVersion = GetVersion(parameters);
     parameters.Initialize(context, gitVersion);
 

build/pack.cake

@@ -15,14 +15,6 @@ Task("Clean")
     CleanDirectories(parameters.Paths.Directories.ToClean);
 });
 
-// This build task can be run to just build
-Task("DogfoodBuild")
-    .IsDependentOn("Clean")
-    .Does<BuildParameters>((parameters) =>
-{
-    Build(parameters.Configuration);
-});
-
 Task("Build")
     .IsDependentOn("Clean")
     .Does<BuildParameters>((parameters) =>

build/utils/utils.cake

@@ -36,23 +36,36 @@ void SetRubyGemPushApiKey(string apiKey)
 
 GitVersion GetVersion(BuildParameters parameters)
 {
-    var dllFile = GetFiles($"**/GitVersionExe/bin/{parameters.Configuration}/{parameters.CoreFxVersion}/GitVersion.dll").FirstOrDefault();
-    var settings = new GitVersionSettings
-    {
-        OutputType = GitVersionOutput.Json,
-        ToolPath = FindToolInPath(IsRunningOnUnix() ? "dotnet" : "dotnet.exe"),
-        ArgumentCustomization = args => dllFile + " " + args.Render()
-    };
-
-    var gitVersion = GitVersion(settings);
-
-    if (!parameters.IsLocalBuild && !(parameters.IsRunningOnAzurePipeline && parameters.IsPullRequest))
-    {
-        settings.UpdateAssemblyInfo = true;
-        settings.LogFilePath = "console";
-        settings.OutputType = GitVersionOutput.BuildServer;
-
-        GitVersion(settings);
+    GitVersion gitVersion;
+    var gitVersionFile = ((DirectoryPath)Directory("./artifacts")).CombineWithFilePath("GitVersion.json");
+    if (FileExists(gitVersionFile)) {
+        Warning("Using GitVersion information from {0}", gitVersionFile);
+        gitVersion = DeserializeJsonFromFile<GitVersion>(gitVersionFile);
+    }
+    else {
+        Warning("Dogfood GitVersion to get information");
+
+        Build(parameters.Configuration);
+        var dllFile = GetFiles($"**/GitVersionExe/bin/{parameters.Configuration}/{parameters.CoreFxVersion}/GitVersion.dll").FirstOrDefault();
+        
+        var settings = new GitVersionSettings
+        {
+            OutputType = GitVersionOutput.Json,
+            ToolPath = FindToolInPath(IsRunningOnUnix() ? "dotnet" : "dotnet.exe"),
+            ArgumentCustomization = args => dllFile + " " + args.Render()
+        };
+
+        gitVersion = GitVersion(settings);
+        SerializeJsonToPrettyFile(gitVersionFile, gitVersion);
+
+        if (!parameters.IsLocalBuild && !(parameters.IsRunningOnAzurePipeline && parameters.IsPullRequest))
+        {
+            settings.UpdateAssemblyInfo = true;
+            settings.LogFilePath = "console";
+            settings.OutputType = GitVersionOutput.BuildServer;
+
+            GitVersion(settings);
+        }
     }
     return gitVersion;
 }