Allow move of repository head for dynamic repositories

Author: GeertvanHorrik

src/GitVersionCore/GitPreparer.cs

@@ -50,7 +50,7 @@ public void Initialise(bool normaliseGitDirectory, string currentBranch, bool sh
                         {
                             CleanupDuplicateOrigin();
                         }
-                        GitRepositoryHelper.NormalizeGitDirectory(GetDotGitDirectory(), authentication, noFetch, currentBranch);
+                        GitRepositoryHelper.NormalizeGitDirectory(GetDotGitDirectory(), authentication, noFetch, currentBranch, IsDynamicGitRepository);
                     }
                 }
                 return;
@@ -180,7 +180,7 @@ static string CreateDynamicRepository(string targetPath, AuthenticationInfo auth
                     Logger.WriteInfo("Git repository already exists");
                     using (Logger.IndentLog($"Normalizing git directory for branch '{targetBranch}'"))
                     {
-                        GitRepositoryHelper.NormalizeGitDirectory(gitDirectory, authentication, noFetch, targetBranch);
+                        GitRepositoryHelper.NormalizeGitDirectory(gitDirectory, authentication, noFetch, targetBranch, true);
                     }
 
                     return gitDirectory;
@@ -191,7 +191,7 @@ static string CreateDynamicRepository(string targetPath, AuthenticationInfo auth
                 using (Logger.IndentLog($"Normalizing git directory for branch '{targetBranch}'"))
                 {
                     // Normalize (download branches) before using the branch
-                    GitRepositoryHelper.NormalizeGitDirectory(gitDirectory, authentication, noFetch, targetBranch);
+                    GitRepositoryHelper.NormalizeGitDirectory(gitDirectory, authentication, noFetch, targetBranch, true);
                 }
 
                 return gitDirectory;

src/GitVersionCore/Helpers/GitRepositoryHelper.cs

@@ -11,7 +11,8 @@ public static class GitRepositoryHelper
         /// Normalisation of a git directory turns all remote branches into local branches, turns pull request refs into a real branch and a few other things. This is designed to be run *only on the build server* which checks out repositories in different ways.
         /// It is not recommended to run normalisation against a local repository
         /// </summary>
-        public static void NormalizeGitDirectory(string gitDirectory, AuthenticationInfo authentication, bool noFetch, string currentBranch)
+        public static void NormalizeGitDirectory(string gitDirectory, AuthenticationInfo authentication,
+            bool noFetch, string currentBranch, bool isDynamicRepository)
         {
             using (var repo = new Repository(gitDirectory))
             {
@@ -41,7 +42,7 @@ public static void NormalizeGitDirectory(string gitDirectory, AuthenticationInfo
                     // Bug fix for https://github.com/GitTools/GitVersion/issues/1754, head maybe have been changed
                     // if this is a dynamic repository. But only allow this in case the branches are different (branch switch)
                     if (expectedSha != repo.Head.Tip.Sha &&
-                        !expectedBranchName.IsBranch(currentBranch))
+                        (isDynamicRepository || !expectedBranchName.IsBranch(currentBranch)))
                     {
                         var newExpectedSha = repo.Head.Tip.Sha;
                         var newExpectedBranchName = repo.Head.CanonicalName;