/// <summary>
/// Determines if the specified path is the current working directory
/// or a parent of the current working directory.
/// </summary>
/// <param name="path">
/// A monad namespace absolute or relative path.
/// </param>
/// <param name="context">
/// The context the provider uses when performing the operation.
/// </param>
/// <returns>
/// true, if the path is the current working directory or a parent of the current
/// working directory. false, otherwise.
/// </returns>
/// <exception cref="ArgumentNullException">
/// If <paramref name="path"/> is null.
/// </exception>
/// <exception cref="ProviderNotFoundException">
/// If the path is a provider-qualified path for a provider that is
/// not loaded into the system.
/// </exception>
/// <exception cref="DriveNotFoundException">
/// If the <paramref name="path"/> refers to a drive that could not be found.
/// </exception>
/// <exception cref="ProviderInvocationException">
/// If the provider used to build the path threw an exception.
/// </exception>
/// <exception cref="NotSupportedException">
/// If the provider that the <paramref name="path"/> represents is not a NavigationCmdletProvider
/// or ContainerCmdletProvider.
/// </exception>
/// <exception cref="InvalidOperationException">
/// If the <paramref name="path"/> starts with "~" and the home location is not set for
/// the provider.
/// </exception>
/// <exception cref="ProviderInvocationException">
/// If the provider specified by <paramref name="providerId"/> threw an
/// exception when its GetParentPath or MakePath was called while
/// processing the <paramref name="path"/>.
/// </exception>
internal bool IsCurrentLocationOrAncestor(string path, CmdletProviderContext context)
{
bool result = false;
if (path == null)
{
throw PSTraceSource.NewArgumentNullException("path");
}
PSDriveInfo drive = null;
ProviderInfo provider = null;
string providerSpecificPath =
Globber.GetProviderPath(
path,
context,
out provider,
out drive);
if (drive != null)
{
s_tracer.WriteLine("Tracing drive");
drive.Trace();
}
Dbg.Diagnostics.Assert(
providerSpecificPath != null,
"There should always be a way to generate a provider path for a " +
"given path");
if (drive != null)
{
context.Drive = drive;
}
// Check to see if the path that was specified is within the current
// working drive
if (drive == CurrentDrive)
{
// The path needs to be normalized to get rid of relative path tokens
// so they don't interfere with our path comparisons below
CmdletProviderContext normalizePathContext
= new CmdletProviderContext(context);
try
{
providerSpecificPath = NormalizeRelativePath(path, null, normalizePathContext);
}
catch (NotSupportedException)
{
// Since the provider does not support normalizing the path, just
// use the path we currently have.
}
catch (LoopFlowException)
{
throw;
}
catch (PipelineStoppedException)
{
throw;
}
catch (ActionPreferenceStopException)
{
throw;
}
finally
{
normalizePathContext.RemoveStopReferral();
}
if (normalizePathContext.HasErrors())
{
normalizePathContext.ThrowFirstErrorOrDoNothing();
}
s_tracer.WriteLine("Provider path = {0}", providerSpecificPath);
// Get the current working directory provider specific path
PSDriveInfo currentWorkingDrive = null;
ProviderInfo currentDriveProvider = null;
string currentWorkingPath =
Globber.GetProviderPath(
".",
context,
out currentDriveProvider,
out currentWorkingDrive);
Dbg.Diagnostics.Assert(
currentWorkingDrive == CurrentDrive,
"The current working drive should be the CurrentDrive.");
s_tracer.WriteLine(
"Current working path = {0}",
currentWorkingPath);
// See if the path is the current working directory or a parent
// of the current working directory
s_tracer.WriteLine(
"Comparing {0} to {1}",
providerSpecificPath,
currentWorkingPath);
if (String.Compare(providerSpecificPath, currentWorkingPath, StringComparison.CurrentCultureIgnoreCase) == 0)
{
// The path is the current working directory so
// return true
s_tracer.WriteLine("The path is the current working directory");
result = true;
}
else
{
// Check to see if the specified path is a parent
// of the current working directory
string lockedDirectory = currentWorkingPath;
while (lockedDirectory.Length > 0)
{
// We need to allow the provider to go as far up the tree
// as it can even if that means it has to traverse higher
// than the mount point for this drive. That is
// why we are passing the empty string as the root here.
lockedDirectory =
GetParentPath(
drive.Provider,
lockedDirectory,
String.Empty,
context);
s_tracer.WriteLine(
"Comparing {0} to {1}",
lockedDirectory,
providerSpecificPath);
if (String.Compare(lockedDirectory, providerSpecificPath, StringComparison.CurrentCultureIgnoreCase) == 0)
{
// The path is a parent of the current working
// directory
s_tracer.WriteLine(
"The path is a parent of the current working directory: {0}",
lockedDirectory);
result = true;
break;
}
}
}
}
else
{
s_tracer.WriteLine("Drives are not the same");
}
return(result);
}