/// <summary>Create Inode Tree from the specified mount-table specified in Config</summary>
/// <param name="config">
/// - the mount table keys are prefixed with
/// FsConstants.CONFIG_VIEWFS_PREFIX
/// </param>
/// <param name="viewName">- the name of the mount table - if null use defaultMT name
/// </param>
/// <exception cref="Org.Apache.Hadoop.FS.UnsupportedFileSystemException"/>
/// <exception cref="URISyntaxException"/>
/// <exception cref="Org.Apache.Hadoop.FS.FileAlreadyExistsException"/>
/// <exception cref="System.IO.IOException"/>
protected internal InodeTree(Configuration config, string viewName)
{
string vName = viewName;
if (vName == null)
{
vName = Constants.ConfigViewfsDefaultMountTable;
}
homedirPrefix = ConfigUtil.GetHomeDirValue(config, vName);
root = new InodeTree.INodeDir <T>("/", UserGroupInformation.GetCurrentUser());
root.InodeDirFs = GetTargetFileSystem(root);
root.isRoot = true;
string mtPrefix = Constants.ConfigViewfsPrefix + "." + vName + ".";
string linkPrefix = Constants.ConfigViewfsLink + ".";
string linkMergePrefix = Constants.ConfigViewfsLinkMerge + ".";
bool gotMountTableEntry = false;
UserGroupInformation ugi = UserGroupInformation.GetCurrentUser();
foreach (KeyValuePair <string, string> si in config)
{
string key = si.Key;
if (key.StartsWith(mtPrefix))
{
gotMountTableEntry = true;
bool isMergeLink = false;
string src = Runtime.Substring(key, mtPrefix.Length);
if (src.StartsWith(linkPrefix))
{
src = Runtime.Substring(src, linkPrefix.Length);
}
else
{
if (src.StartsWith(linkMergePrefix))
{
// A merge link
isMergeLink = true;
src = Runtime.Substring(src, linkMergePrefix.Length);
}
else
{
if (src.StartsWith(Constants.ConfigViewfsHomedir))
{
// ignore - we set home dir from config
continue;
}
else
{
throw new IOException("ViewFs: Cannot initialize: Invalid entry in Mount table in config: "
+ src);
}
}
}
string target = si.Value;
// link or merge link
CreateLink(src, target, isMergeLink, ugi);
}
}
if (!gotMountTableEntry)
{
throw new IOException("ViewFs: Cannot initialize: Empty Mount table in config for "
+ vName == null ? "viewfs:///" : ("viewfs://" + vName + "/"));
}
}
