/// <summary>
/// For a given absolute path, create all ancestors as directories along the
/// path.
/// </summary>
/// <remarks>
/// For a given absolute path, create all ancestors as directories along the
/// path. All ancestors inherit their parent's permission plus an implicit
/// u+wx permission. This is used by create() and addSymlink() for
/// implicitly creating all directories along the path.
/// For example, path="/foo/bar/spam", "/foo" is an existing directory,
/// "/foo/bar" is not existing yet, the function will create directory bar.
/// </remarks>
/// <returns>
/// a tuple which contains both the new INodesInPath (with all the
/// existing and newly created directories) and the last component in the
/// relative path. Or return null if there are errors.
/// </returns>
/// <exception cref="System.IO.IOException"/>
internal static KeyValuePair <INodesInPath, string> CreateAncestorDirectories(FSDirectory
fsd, INodesInPath iip, PermissionStatus permission)
{
string last = new string(iip.GetLastLocalName(), Charsets.Utf8);
INodesInPath existing = iip.GetExistingINodes();
IList <string> children = iip.GetPath(existing.Length(), iip.Length() - existing.Length
());
int size = children.Count;
if (size > 1)
{
// otherwise all ancestors have been created
IList <string> directories = children.SubList(0, size - 1);
INode parentINode = existing.GetLastINode();
// Ensure that the user can traversal the path by adding implicit
// u+wx permission to all ancestor directories
existing = CreateChildrenDirectories(fsd, existing, directories, AddImplicitUwx(parentINode
.GetPermissionStatus(), permission));
if (existing == null)
{
return(null);
}
}
return(new AbstractMap.SimpleImmutableEntry <INodesInPath, string>(existing, last));
}