public void WrapsIOExceptionsDuringWrite()
{
MockFileSystem fs = new MockFileSystem();
FileSystemTaskQueue dut = CreateFileBasedQueue(fs, Item1EntryText);
dut.IsEmpty.ShouldBeFalse();
fs.File.TruncateWrites = true;
Assert.Throws <FileBasedCollectionException>(() => dut.EnqueueAndFlush(Item2Payload));
fs.File.TruncateWrites = false;
fs.File.ReadAt(fs.File.Length - 2, 2).ShouldNotEqual("\r\n", "Bad Test: The file is supposed to be corrupt.");
string error;
FileSystemTaskQueue.TryCreate(null, MockEntryFileName, fs, out dut, out error).ShouldEqual(true);
dut.IsEmpty.ShouldBeFalse();
using (dut)
{
FileSystemTask output;
dut.TryPeek(out output).ShouldEqual(true);
output.ShouldEqual(Item1Payload);
dut.DequeueAndFlush(output);
}
dut.IsEmpty.ShouldBeTrue();
}
private static FileSystemTaskQueue CreateFileBasedQueue(MockFileSystem fs, string initialContents)
{
fs.File = new ReusableMemoryStream(initialContents);
fs.ExpectedPath = MockEntryFileName;
string error;
FileSystemTaskQueue dut;
FileSystemTaskQueue.TryCreate(null, MockEntryFileName, fs, out dut, out error).ShouldEqual(true, error);
dut.ShouldNotBeNull();
return(dut);
}
public void ReturnsFalseWhenOpenFails()
{
MockFileSystem fs = new MockFileSystem();
fs.File = new ReusableMemoryStream(string.Empty);
fs.ThrowDuringOpen = true;
string error;
FileSystemTaskQueue dut;
FileSystemTaskQueue.TryCreate(null, MockEntryFileName, fs, out dut, out error).ShouldEqual(false);
dut.ShouldBeNull();
error.ShouldNotBeNull();
}
public override IssueType HasIssue(List <string> messages)
{
string error;
FileSystemTaskQueue instance;
if (!FileSystemTaskQueue.TryCreate(
this.Tracer,
this.dataPath,
new PhysicalFileSystem(),
out instance,
out error))
{
messages.Add("Failed to read background operations: " + error);
return(IssueType.CantFix);
}
return(IssueType.None);
}
private bool UpdateBackgroundOperations(ITracer tracer, string dotGVFSRoot)
{
string esentBackgroundOpsFolder = Path.Combine(dotGVFSRoot, EsentBackgroundOpsFolder);
if (Directory.Exists(esentBackgroundOpsFolder))
{
string newBackgroundOpsFolder = Path.Combine(dotGVFSRoot, GVFSConstants.DotGVFS.Databases.BackgroundFileSystemTasks);
try
{
using (PersistentDictionary <long, GVFltCallbacks.BackgroundGitUpdate> oldBackgroundOps =
new PersistentDictionary <long, GVFltCallbacks.BackgroundGitUpdate>(esentBackgroundOpsFolder))
{
string error;
FileSystemTaskQueue newBackgroundOps;
if (!FileSystemTaskQueue.TryCreate(
tracer,
newBackgroundOpsFolder,
new PhysicalFileSystem(),
out newBackgroundOps,
out error))
{
tracer.RelatedError("Failed to create new background operations folder: " + error);
return(false);
}
using (newBackgroundOps)
{
foreach (KeyValuePair <long, GVFltCallbacks.BackgroundGitUpdate> kvp in oldBackgroundOps)
{
tracer.RelatedInfo("Copying ESENT entry: {0} = {1}", kvp.Key, kvp.Value);
newBackgroundOps.EnqueueAndFlush(
new FileSystemTask(
(FileSystemTask.OperationType)kvp.Value.Operation,
kvp.Value.VirtualPath,
kvp.Value.OldVirtualPath));
}
}
}
}
catch (IOException ex)
{
tracer.RelatedError("Could not write to new background operations: " + ex.Message);
return(false);
}
catch (EsentException ex)
{
tracer.RelatedError("BackgroundOperations appears to be from an older version of GVFS and corrupted: " + ex.Message);
return(false);
}
string backupName;
if (this.TryRenameFolderForDelete(tracer, esentBackgroundOpsFolder, out backupName))
{
// If this fails, we leave behind cruft, but there's no harm because we renamed.
this.TryDeleteFolder(tracer, backupName);
return(true);
}
else
{
// To avoid double upgrading, we should rollback if we can't rename the old data
this.TryDeleteFile(tracer, RepoMetadata.Instance.DataFilePath);
return(false);
}
}
return(true);
}