org.apache.hadoop.security
Class ShellBasedUnixGroupsNetgroupMapping

java.lang.Object
  org.apache.hadoop.security.ShellBasedUnixGroupsMapping
      org.apache.hadoop.security.ShellBasedUnixGroupsNetgroupMapping

public class ShellBasedUnixGroupsNetgroupMapping
extends ShellBasedUnixGroupsMapping

A simple shell-based implementation of GroupMappingServiceProvider that exec's the groups shell command to fetch the group memberships of a given user.

Field Summary

protected static Map<String,Set<String>>	netgroupToUsersMap
protected static boolean	netgroupToUsersMapUpdated
protected static Map<String,Set<String>>	userToNetgroupsMap

Constructor Summary

ShellBasedUnixGroupsNetgroupMapping()

Method Summary

void	cacheGroupsAdd(List<String> groups) Caches the group user information
void	cacheGroupsRefresh() Refresh the cache of groups and user mapping
protected void	cacheNetgroup(String group)
protected String	execShellGetUnixGroups(String user)
protected String	execShellGetUserForNetgroup(String netgroup)
List<String>	getGroups(String user) Get all various group memberships of a given user.
protected void	getNetgroups(String user, List<String> groups)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

netgroupToUsersMapUpdated

protected static boolean netgroupToUsersMapUpdated

netgroupToUsersMap

protected static Map<String,Set<String>> netgroupToUsersMap

userToNetgroupsMap

protected static Map<String,Set<String>> userToNetgroupsMap

Constructor Detail

ShellBasedUnixGroupsNetgroupMapping

public ShellBasedUnixGroupsNetgroupMapping()

Method Detail

getGroups

public List<String> getGroups(String user)
                       throws IOException

Get all various group memberships of a given user. Returns EMPTY list in case of non-existing user

Overrides:

getGroups in class ShellBasedUnixGroupsMapping

Parameters:

user - User's name

Returns:

group memberships of user

Throws:

IOException

cacheGroupsRefresh

public void cacheGroupsRefresh()
                        throws IOException

Refresh the cache of groups and user mapping

Overrides:

cacheGroupsRefresh in class ShellBasedUnixGroupsMapping

Throws:

IOException

cacheGroupsAdd

public void cacheGroupsAdd(List<String> groups)
                    throws IOException

Caches the group user information

Overrides:

cacheGroupsAdd in class ShellBasedUnixGroupsMapping

Parameters:

groups - list of groups to add to cache

Throws:

IOException

cacheNetgroup

protected void cacheNetgroup(String group)
                      throws IOException

Throws:

IOException

getNetgroups

protected void getNetgroups(String user,
                            List<String> groups)
                     throws IOException

Throws:

IOException

execShellGetUnixGroups

protected String execShellGetUnixGroups(String user)
                                 throws IOException

Throws:

IOException

execShellGetUserForNetgroup

protected String execShellGetUserForNetgroup(String netgroup)
                                      throws IOException

Throws:

IOException