/// <summary>
/// Creates a state with enabled journal.
/// </summary>
public static JournalState CreateEnabledJournal(VolumeMap volumeMap, IChangeJournalAccessor journal)
{
Contract.Requires(volumeMap != null);
Contract.Requires(journal != null);
return(new JournalState(volumeMap, journal));
}
/// <summary>
/// Deserializes into an instance of <see cref="VolumeMap"/>.
/// </summary>
public static VolumeMap Deserialize(BuildXLReader reader)
{
Contract.Requires(reader != null);
var volumeMap = new VolumeMap();
int count = reader.ReadInt32Compact();
for (int i = 0; i < count; ++i)
{
ulong serialNumber = reader.ReadUInt64();
bool isValid = reader.ReadBoolean();
VolumeGuidPath path = isValid ? VolumeGuidPath.Create(reader.ReadString()) : VolumeGuidPath.Invalid;
volumeMap.m_volumePathsBySerial.Add(serialNumber, path);
}
int numJunctionRoots = reader.ReadInt32Compact();
for (int i = 0; i < numJunctionRoots; ++i)
{
string path = reader.ReadString();
var id = FileIdAndVolumeId.Deserialize(reader);
volumeMap.m_junctionRootFileIds.Add(path, id);
}
return(volumeMap);
}
/// <summary>
/// Validate junction roots
/// </summary>
public void ValidateJunctionRoots(LoggingContext loggingContext, VolumeMap previousMap)
{
var changed = new List <string>();
var unchanged = new List <string>();
foreach (var junction in m_junctionRootFileIds)
{
string path = junction.Key;
FileIdAndVolumeId previousId;
JunctionRootValidationResult result;
if (previousMap.m_junctionRootFileIds.TryGetValue(junction.Key, out previousId))
{
if (previousId == junction.Value)
{
unchanged.Add(path);
result = JunctionRootValidationResult.Unchanged;
}
else
{
changed.Add(path);
result = JunctionRootValidationResult.Changed;
}
}
else
{
changed.Add(path);
result = JunctionRootValidationResult.NotFound;
}
Logger.Log.ValidateJunctionRoot(loggingContext, path, result.ToString());
}
ChangedJunctionRoots = changed;
UnchangedJunctionRoots = unchanged;
}
/// <summary>
/// Creates a map of local volumes. In the event of a collision which prevents constructing a serial -> path mapping,
/// a warning is logged and those volumes are excluded from the map. On failure, returns null.
/// </summary>
public static VolumeMap CreateMapOfAllLocalVolumes(
LoggingContext loggingContext,
IReadOnlyList <string> junctionRoots = null,
IReadOnlyList <string> gvfsProjectionFiles = null)
{
var map = new VolumeMap();
var guidPaths = new HashSet <VolumeGuidPath>();
List <Tuple <VolumeGuidPath, ulong> > volumes = FileUtilities.ListVolumeGuidPathsAndSerials();
foreach (var volume in volumes)
{
bool guidPathUnique = guidPaths.Add(volume.Item1);
Contract.Assume(guidPathUnique, "Duplicate guid path");
VolumeGuidPath collidedGuidPath;
if (map.m_volumePathsBySerial.TryGetValue(volume.Item2, out collidedGuidPath))
{
if (collidedGuidPath.IsValid)
{
// This could be an error. Instead, we optimistically create a partial map and hope that theese volumes are not relevant to the build.
// Some users have reported VHD-creation automation (concurrent with BuildXL) causing a collision.
Logger.Log.StorageVolumeCollision(loggingContext, volume.Item2, volume.Item1.Path, collidedGuidPath.Path);
// Poison this entry so that we know it is unusable on lookup (ambiguous)
map.m_volumePathsBySerial[volume.Item2] = VolumeGuidPath.Invalid;
}
}
else
{
map.m_volumePathsBySerial.Add(volume.Item2, volume.Item1);
}
}
toDictionary(junctionRoots, map.m_junctionRootFileIds);
toDictionary(gvfsProjectionFiles, map.m_gvfsProjections);
return(map);
void toDictionary(IEnumerable <string> paths, Dictionary <string, FileIdAndVolumeId> result)
{
if (paths != null)
{
foreach (var pathStr in paths)
{
FileIdAndVolumeId?id = TryGetFinalFileIdAndVolumeId(pathStr);
if (id.HasValue)
{
result[pathStr] = id.Value;
}
}
}
}
}
/// <summary>
/// Tries to get <see cref="IChangeJournalAccessor"/>.
/// </summary>
public static Possible <IChangeJournalAccessor> TryGetJournalAccessor(VolumeMap volumeMap, string path)
{
Contract.Requires(volumeMap != null);
Contract.Requires(!string.IsNullOrWhiteSpace(path));
var inprocAccessor = new InProcChangeJournalAccessor();
try
{
// When the current process runs with elevation, the process can access the journal directly. However, even with such a capability,
// the process may fail in opening the volume handle. Thus, we need to verify that the process is able to open the volume handle.
// If the operating system is Win10-RedStone2, it can directly access the journal as well.
using (var file = FileUtilities.CreateFileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete))
{
var volume = volumeMap.TryGetVolumePathForHandle(file.SafeFileHandle);
if (volume.IsValid)
{
// Journal accessor needs to know whether the OS allows unprivileged journal operations
// because some operation names (e.g., reading journal, getting volume handle) are different.
inprocAccessor.IsJournalUnprivileged = !CurrentProcess.IsElevated;
// Attempt to access journal. Any error means that the journal operations are not unprivileged yet in the host computer.
var result = inprocAccessor.QueryJournal(new QueryJournalRequest(volume));
if (!result.IsError)
{
if (result.Response.Succeeded)
{
return(inprocAccessor);
}
else
{
return(new Failure <string>(I($"Querying journal results in {result.Response.Status.ToString()}")));
}
}
else
{
return(new Failure <string>(result.Error.Message));
}
}
else
{
return(new Failure <string>(I($"Failed to get volume path for '{path}'")));
}
}
}
catch (BuildXLException ex)
{
return(new Failure <string>(ex.Message));
}
}
/// <summary>
/// Deserializes into an instance of <see cref="VolumeMap"/>.
/// </summary>
public static VolumeMap Deserialize(BuildXLReader reader)
{
Contract.Requires(reader != null);
var volumeMap = new VolumeMap();
int count = reader.ReadInt32Compact();
for (int i = 0; i < count; ++i)
{
ulong serialNumber = reader.ReadUInt64();
bool isValid = reader.ReadBoolean();
VolumeGuidPath path = isValid ? VolumeGuidPath.Create(reader.ReadString()) : VolumeGuidPath.Invalid;
volumeMap.m_volumePathsBySerial.Add(serialNumber, path);
}
ReadDictionary(reader, volumeMap.m_junctionRootFileIds);
ReadDictionary(reader, volumeMap.m_gvfsProjections);
return(volumeMap);
}
/// <summary>
/// Validate junction roots
/// </summary>
public void ValidateJunctionRoots(LoggingContext loggingContext, VolumeMap previousMap)
{
m_unchangedJunctionRoots.Clear();
m_changedGvfsProjections.Clear();
foreach (var junction in m_junctionRootFileIds)
{
string path = junction.Key;
var result = compareToPrevious(path, junction.Value, previousMap.m_junctionRootFileIds);
Logger.Log.ValidateJunctionRoot(loggingContext, path, result.ToString());
if (result == PathValidationResult.Unchanged)
{
m_unchangedJunctionRoots.Add(path);
}
}
foreach (var gvfsProjection in m_gvfsProjections)
{
string gvfsProjectionFile = gvfsProjection.Key;
var result = compareToPrevious(gvfsProjectionFile, gvfsProjection.Value, previousMap.m_gvfsProjections);
Logger.Log.ValidateJunctionRoot(loggingContext, gvfsProjectionFile, result.ToString());
if (result != PathValidationResult.Unchanged)
{
m_changedGvfsProjections.Add(gvfsProjectionFile);
}
}
PathValidationResult compareToPrevious(string path, FileIdAndVolumeId id, Dictionary <string, FileIdAndVolumeId> previousMap)
{
var previousFound = previousMap.TryGetValue(path, out var previousId);
return
(previousFound && previousId == id ? PathValidationResult.Unchanged :
previousFound && previousId != id ? PathValidationResult.Changed :
PathValidationResult.NewlyCreated);
}
}
private JournalState(VolumeMap volumeMap, IChangeJournalAccessor journal)
{
Journal = journal;
VolumeMap = volumeMap;
}
/// <summary>
/// Tries to get <see cref="IChangeJournalAccessor"/>.
/// </summary>
public static Optional <IChangeJournalAccessor> TryGetJournalAccessor(LoggingContext loggingContext, VolumeMap volumeMap, string path)
{
Contract.Requires(loggingContext != null);
Contract.Requires(volumeMap != null);
Contract.Requires(!string.IsNullOrWhiteSpace(path));
var inprocAccessor = new InProcChangeJournalAccessor();
// If the current process is called with elevation, it can directly access the journal.
if (CurrentProcess.IsElevated)
{
return(inprocAccessor);
}
try
{
// If the operating system is Win10-RedStone2, it can directly access the journal as well.
using (var file = FileUtilities.CreateFileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete))
{
var volume = volumeMap.TryGetVolumePathForHandle(file.SafeFileHandle);
if (volume.IsValid)
{
// Journal accessor needs to know whether the OS allows unprivileged journal operations
// because some operation names (e.g., reading journal, getting volume handle) are different.
inprocAccessor.IsJournalUnprivileged = true;
// Attempt to access journal. Any error means that the journal operations are not unprivileged yet in the host computer.
var result = inprocAccessor.QueryJournal(new QueryJournalRequest(volume));
if (!result.IsError && result.Response.Succeeded)
{
return(inprocAccessor);
}
}
}
}
catch (BuildXLException ex)
{
Logger.Log.FailedCheckingDirectJournalAccess(loggingContext, ex.Message);
return(default(Optional <IChangeJournalAccessor>));
}
return(default(Optional <IChangeJournalAccessor>));
}
internal VolumeAccessor(VolumeMap map)
{
Contract.Requires(map != null);
m_map = map;
Disposed = false;
}
