Use gvfs-helper to download initial commit

Directory.Build.props

@@ -36,7 +36,7 @@
 
     <!-- Version information -->
     <ScalarVersion>0.2.173.2</ScalarVersion>
-    <GitPackageVersion>2.20191111.3-sc</GitPackageVersion>
+    <GitPackageVersion>2.20191113.1</GitPackageVersion>
 
     <!-- Signing certificates -->
     <AuthenticodeCert>Microsoft400</AuthenticodeCert>

Scalar.Common/Git/GitObjects.cs

@@ -15,7 +15,7 @@
 
 namespace Scalar.Common.Git
 {
-    public abstract class GitObjects
+    public class GitObjects
     {
         protected readonly ITracer Tracer;
         protected readonly GitObjectsHttpRequestor GitObjectRequestor;
@@ -47,35 +47,6 @@ public static bool IsLooseObjectsDirectory(string value)
             return value.Length == 2 && value.All(c => Uri.IsHexDigit(c));
         }
 
-        public virtual bool TryDownloadCommit(string commitSha)
-        {
-            const bool PreferLooseObjects = false;
-            IEnumerable<string> objectIds = new[] { commitSha };
-
-            GitProcess gitProcess = new GitProcess(this.Enlistment);
-            RetryWrapper<GitObjectsHttpRequestor.GitObjectTaskResult>.InvocationResult output = this.GitObjectRequestor.TryDownloadObjects(
-                objectIds,
-                onSuccess: (tryCount, response) => this.TrySavePackOrLooseObject(objectIds, PreferLooseObjects, response, gitProcess),
-                onFailure: (eArgs) =>
-                {
-                    EventMetadata metadata = CreateEventMetadata(eArgs.Error);
-                    metadata.Add("Operation", "DownloadAndSaveObjects");
-                    metadata.Add("WillRetry", eArgs.WillRetry);
-
-                    if (eArgs.WillRetry)
-                    {
-                        this.Tracer.RelatedWarning(metadata, eArgs.Error.ToString(), Keywords.Network | Keywords.Telemetry);
-                    }
-                    else
-                    {
-                        this.Tracer.RelatedError(metadata, eArgs.Error.ToString(), Keywords.Network);
-                    }
-                },
-                preferBatchedLooseObjects: PreferLooseObjects);
-
-            return output.Succeeded && output.Result.Success;
-        }
-
         public virtual void DeleteStaleTempPrefetchPackAndIdxs()
         {
             string[] staleTempPacks = this.ReadPackFileNames(Path.Combine(this.Enlistment.GitPackRoot, GitObjects.TempPackFolder), ScalarConstants.PrefetchPackPrefix);
@@ -170,7 +141,7 @@ public virtual bool TryDownloadPrefetchPacks(GitProcess gitProcess, long latestT
             }
         }
 
-        public virtual string WriteLooseObject(Stream responseStream, string sha,byte[] bufToCopyWith)
+        public virtual string WriteLooseObject(Stream responseStream, string sha, byte[] bufToCopyWith)
         {
             try
             {

Scalar.Common/Git/GitProcess.cs

@@ -438,6 +438,17 @@ public Result SparseCheckoutSet(List<string> foldersToSet)
                 });
         }
 
+        public Result GvfsHelperDownloadCommit(string commitId)
+        {
+            return this.InvokeGitInWorkingDirectoryRoot(
+                $"gvfs-helper -f post",
+                fetchMissingObjects: false,
+                writeStdIn: writer =>
+                {
+                    writer.Write($"{commitId}\n");
+                });
+        }
+
         public Result Status(bool allowObjectDownloads, bool useStatusCache, bool showUntracked = false)
         {
             string command = "status";