Fix reading remote from config (#345)

src/Common/GetSourceLinkUrlGitTask.cs

@@ -103,7 +103,7 @@ private void ExecuteImpl()
                 return;
             }
 
-            bool IsHexDigit(char c)
+            static bool IsHexDigit(char c)
                 => c >= '0' && c <= '9' || c >= 'a' && c <= 'f' || c >= 'A' && c <= 'F';
 
             string revisionId = SourceRoot.GetMetadata(Names.SourceRoot.RevisionId);
@@ -149,8 +149,8 @@ public UrlMapping(string host, ITaskItem hostItem, int port, Uri contentUri, boo
 
         private IEnumerable<UrlMapping> GetUrlMappings(Uri gitUri)
         {
-            bool isValidContentUri(Uri uri)
-                => uri.Query == "" && uri.UserInfo == "";
+            static bool isValidContentUri(Uri uri)
+                => uri.GetHost() != "" && uri.Query == "" && uri.UserInfo == "";
 
             if (Hosts != null)
             {
@@ -186,7 +186,16 @@ bool isValidContentUri(Uri uri)
             {
                 if (Uri.TryCreate(RepositoryUrl, UriKind.Absolute, out var uri))
                 {
-                    yield return new UrlMapping(uri.GetHost(), hostItem: null, uri.GetExplicitPort(), GetDefaultContentUriFromRepositoryUri(uri), hasDefaultContentUri: true);
+                    // If the URL is a local path the host will be empty.
+                    var host = uri.GetHost();
+                    if (host != "")
+                    {
+                        yield return new UrlMapping(host, hostItem: null, uri.GetExplicitPort(), GetDefaultContentUriFromRepositoryUri(uri), hasDefaultContentUri: true);
+                    }
+                    else
+                    {
+                        Log.LogError(CommonResources.ValuePassedToTaskParameterNotValidHostUri, nameof(RepositoryUrl), RepositoryUrl);
+                    }
                 }
                 else
                 {

src/Microsoft.Build.Tasks.Git/GitOperations.cs

@@ -15,15 +15,17 @@ internal static class GitOperations
     {
         private const string SourceControlName = "git";
         private const string RemoteSectionName = "remote";
+        private const string RemoteOriginName = "origin";
         private const string UrlSectionName = "url";
+        private const string UrlVariableName = "url";
 
         public static string GetRepositoryUrl(GitRepository repository, string remoteName, Action<string, object[]> logWarning = null)
         {
             string unknownRemoteName = null;
             string remoteUrl = null;
             if (!string.IsNullOrEmpty(remoteName))
             {
-                remoteUrl = repository.Config.GetVariableValue(RemoteSectionName, remoteName, "url");
+                remoteUrl = repository.Config.GetVariableValue(RemoteSectionName, remoteName, UrlVariableName);
                 if (remoteUrl == null)
                 {
                     unknownRemoteName = remoteName;
@@ -52,15 +54,15 @@ public static string GetRepositoryUrl(GitRepository repository, string remoteNam
 
         private static bool TryGetRemote(GitConfig config, out string remoteName, out string remoteUrl)
         {
-            remoteName = "origin";
-            remoteUrl = config.GetVariableValue(RemoteSectionName, remoteName, "url");
+            remoteName = RemoteOriginName;
+            remoteUrl = config.GetVariableValue(RemoteSectionName, remoteName, UrlVariableName);
             if (remoteUrl != null)
             {
                 return true;
             }
 
             var remoteVariable = config.Variables.
-                Where(kvp => kvp.Key.SectionNameEquals(RemoteSectionName)).
+                Where(kvp => kvp.Key.SectionNameEquals(RemoteSectionName) && kvp.Key.VariableNameEquals(UrlVariableName)).
                 OrderBy(kvp => kvp.Key.SubsectionName, GitVariableName.SubsectionNameComparer).
                 FirstOrDefault();
 

src/Microsoft.Build.Tasks.Git/RepositoryTask.cs

@@ -94,8 +94,7 @@ private GitRepository GetOrCreateRepositoryInstance()
 
             var initialPath = GetInitialPath();
 
-            GitRepositoryLocation location;
-            if (!GitRepository.TryFindRepository(initialPath, out location))
+            if (!GitRepository.TryFindRepository(initialPath, out var location))
             {
                 Log.LogWarning(Resources.UnableToLocateRepository, initialPath);
                 return null;

src/SourceLink.Common.UnitTests/GetSourceLinkUrlTests.cs

@@ -14,6 +14,7 @@ public class GetSourceLinkUrlTests
         [InlineData("contoso.com/a?x=2")]
         [InlineData("contoso.com/x")]
         [InlineData("[email protected]")]
+        [InlineData("file:///D:/contoso")]
         [InlineData("http://contoso.com")]
         [InlineData("http://contoso.com/a")]
         [InlineData("http://[email protected]")]
@@ -60,6 +61,28 @@ public void ImplicitHost_Errors(string repositoryUrl)
             Assert.False(result);
         }
 
+        [Theory]
+        [InlineData("file:///D:/a/b")]
+        public void ImplicitHost_Local(string repositoryUrl)
+        {
+            var engine = new MockEngine();
+
+            var task = new MockGetSourceLinkUrlGitTask()
+            {
+                BuildEngine = engine,
+                SourceRoot = new MockItem("x", KVP("RepositoryUrl", "http://abc.com"), KVP("SourceControl", "git")),
+                RepositoryUrl = repositoryUrl,
+                IsSingleProvider = true,
+            };
+
+            bool result = task.Execute();
+
+            AssertEx.AssertEqualToleratingWhitespaceDifferences(
+                "ERROR : " + string.Format(CommonResources.ValuePassedToTaskParameterNotValidHostUri, "RepositoryUrl", repositoryUrl), engine.Log);
+
+            Assert.False(result);
+        }
+
         [Theory]
         [InlineData("contoso.com")]
         [InlineData("contoso.com/a")]