Merge branch 'master' into GitVersion-calculating-wrong-version-when-…

…building-a-tag

src/Directory.Build.props

@@ -34,7 +34,7 @@
         <PackageVersion_NUnit>3.12.0</PackageVersion_NUnit>
         <PackageVersion_GitToolsTesting>1.2.0</PackageVersion_GitToolsTesting>
         <PackageVersion_NUnit3TestAdapter>3.17.0</PackageVersion_NUnit3TestAdapter>
-        <PackageVersion_NunitXmlTestLogger>2.1.62</PackageVersion_NunitXmlTestLogger>
+        <PackageVersion_NunitXmlTestLogger>2.1.80</PackageVersion_NunitXmlTestLogger>
         <PackageVersion_Shouldly>4.0.0-beta0004</PackageVersion_Shouldly>
 
     </PropertyGroup>

src/GitVersionCore.Tests/VersionCalculation/NextVersionCalculatorTests.cs

@@ -6,6 +6,7 @@
 using GitVersion.Model.Configuration;
 using GitVersion.VersionCalculation;
 using GitVersionCore.Tests.Helpers;
+using GitVersionCore.Tests.IntegrationTests;
 using GitVersionCore.Tests.Mocks;
 using LibGit2Sharp;
 using Microsoft.Extensions.DependencyInjection;
@@ -214,5 +215,20 @@ public void PreReleaseNumberShouldBeScopeToPreReleaseLabelInContinuousDelivery()
 
             fixture.AssertFullSemver("0.1.0-beta.1+2", config);
         }
+
+        [Test]
+        public void GetNextVersionOnNonMainlineBranchWithoutCommitsShouldWorkNormally()
+        {
+            var config = new Config
+            {
+                VersioningMode = VersioningMode.Mainline,
+                NextVersion = "1.0.0"
+            };
+
+            using var fixture = new EmptyRepositoryFixture();
+            fixture.MakeACommit("initial commit");
+            fixture.BranchTo("feature/f1");
+            fixture.AssertFullSemver("1.0.0-f1.0", config);
+        }
     }
 }

src/GitVersionCore/VersionCalculation/MainlineVersionCalculator.cs

@@ -210,14 +210,17 @@ private Commit FindMergeBaseBeforeForwardMerge(Commit baseVersionSource, Branch
             // detect forward merge and rewind mainlineTip to before it
             if (mergeBase == context.CurrentCommit && !mainlineCommitLog.Contains(mergeBase))
             {
-                var mainlineTipPrevious = mainlineTip.Parents.First();
-                var message = $"Detected forward merge at {mainlineTip}; rewinding mainline to previous commit {mainlineTipPrevious}";
+                var mainlineTipPrevious = mainlineTip.Parents.FirstOrDefault();
+                if (mainlineTipPrevious != null)
+                {
+                    var message = $"Detected forward merge at {mainlineTip}; rewinding mainline to previous commit {mainlineTipPrevious}";
 
-                log.Info(message);
+                    log.Info(message);
 
-                // re-do mergeBase detection before the forward merge
-                mergeBase = repositoryMetadataProvider.FindMergeBase(context.CurrentCommit, mainlineTipPrevious);
-                mainlineTip = GetEffectiveMainlineTip(mainlineCommitLog, mergeBase, mainlineTipPrevious);
+                    // re-do mergeBase detection before the forward merge
+                    mergeBase = repositoryMetadataProvider.FindMergeBase(context.CurrentCommit, mainlineTipPrevious);
+                    mainlineTip = GetEffectiveMainlineTip(mainlineCommitLog, mergeBase, mainlineTipPrevious);
+                }
             }
 
             return mergeBase;

src/GitVersionExe.Tests/ArgumentParserOnBuildServerTests.cs

@@ -0,0 +1,63 @@
+using System;
+using GitVersion;
+using GitVersion.OutputVariables;
+using GitVersionCore.Tests.Helpers;
+using Microsoft.Extensions.DependencyInjection;
+using NUnit.Framework;
+using Shouldly;
+
+namespace GitVersionExe.Tests
+{
+    [TestFixture]
+    public class ArgumentParserOnBuildServerTests : TestBase
+    {
+        private IArgumentParser argumentParser;
+
+        [SetUp]
+        public void SetUp()
+        {
+            var sp = ConfigureServices(services =>
+            {
+                services.AddSingleton<IArgumentParser, ArgumentParser>();
+                services.AddSingleton<IGlobbingResolver, GlobbingResolver>();
+                services.AddSingleton<ICurrentBuildAgent, MockBuildAgent>();
+            });
+            argumentParser = sp.GetService<IArgumentParser>();
+        }
+
+        [Test]
+        public void EmptyOnFetchDisabledBuildServerMeansNoFetchIsTrue()
+        {
+            var arguments = argumentParser.ParseArguments("");
+            arguments.NoFetch.ShouldBe(true);
+        }
+
+        private class MockBuildAgent : ICurrentBuildAgent
+        {
+            public bool CanApplyToCurrentContext()
+            {
+                throw new NotImplementedException();
+            }
+
+            public void WriteIntegration(Action<string> writer, VersionVariables variables, bool updateBuildNumber = true)
+            {
+                throw new NotImplementedException();
+            }
+
+            public string GetCurrentBranch(bool usingDynamicRepos)
+            {
+                throw new NotImplementedException();
+            }
+
+            public bool PreventFetch()
+            {
+                return true;
+            }
+
+            public bool ShouldCleanUpRemotes()
+            {
+                throw new NotImplementedException();
+            }
+        }
+    }
+}

src/GitVersionExe/ArgumentParser.cs

@@ -49,6 +49,8 @@ public Arguments ParseArguments(string[] commandLineArguments)
 
                 AddAuthentication(args);
 
+                args.NoFetch = buildAgent != null && buildAgent.PreventFetch();
+
                 return args;
             }
 

src/GitVersionTask.Tests/GitVersionTask.Tests.csproj

@@ -6,7 +6,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Buildalyzer" Version="3.0.1" />
+        <PackageReference Include="Buildalyzer" Version="3.1.0" />
         <PackageReference Include="LibGit2Sharp" Version="$(PackageVersion_LibGit2Sharp)" />
         <PackageReference Include="Microsoft.Build" Version="$(PackageVersion_MsBuild)" />
         <PackageReference Include="MSBuild.ProjectCreation" Version="1.4.6" />