How to use

constructPath

method

in

org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker

/** Guarded by {@link FSNamesystem#readLock()} */
private void checkTraverse(INodeAttributes[] inodeAttrs, int last)
  throws AccessControlException {
 for (int i=0; i <= last; i++) {
  INodeAttributes inode = inodeAttrs[i];
  if (!inode.isDirectory()) {
   throw new AccessControlException(
     constructPath(inodeAttrs, i) + " (is not a directory)");
  }
  if (!hasPermission(inode, FsAction.EXECUTE)) {
   throw new AccessControlException(toAccessControlString(
     inode, constructPath(inodeAttrs, i), FsAction.EXECUTE));
  }
 }
}

/** Guarded by {@link FSNamesystem#readLock()} */
private void check(INodeAttributes[] inodes, int i, FsAction access)
  throws AccessControlException {
 INodeAttributes inode = (i >= 0) ? inodes[i] : null;
 if (inode != null && !hasPermission(inode, access)) {
  throw new AccessControlException(
    toAccessControlString(inode, constructPath(inodes, i), access));
 }
}

/** Guarded by {@link FSNamesystem#readLock()} */
private void check(INodeAttributes[] inodes, int i, FsAction access)
  throws AccessControlException {
 INodeAttributes inode = (i >= 0) ? inodes[i] : null;
 if (inode != null && !hasPermission(inode, access)) {
  throw new AccessControlException(
    toAccessControlString(inode, constructPath(inodes, i), access));
 }
}

/** Guarded by {@link FSNamesystem#readLock()} */
private void checkOwner(INodeAttributes[] inodes, int i)
  throws AccessControlException {
 if (getUser().equals(inodes[i].getUserName())) {
  return;
 }
 throw new AccessControlException(
   "Permission denied. user=" + getUser() +
   " is not the owner of inode=" + constructPath(inodes, i));
}

/** Guarded by {@link FSNamesystem#readLock()} */
private void checkOwner(INodeAttributes[] inodes, int i)
  throws AccessControlException {
 if (getUser().equals(inodes[i].getUserName())) {
  return;
 }
 throw new AccessControlException(
   "Permission denied. user=" + getUser() +
   " is not the owner of inode=" + constructPath(inodes, i));
}

/** Guarded by {@link FSNamesystem#readLock()} */
private void checkTraverse(INodeAttributes[] inodeAttrs, int last)
  throws AccessControlException {
 for (int i=0; i <= last; i++) {
  INodeAttributes inode = inodeAttrs[i];
  if (!inode.isDirectory()) {
   throw new AccessControlException(
     constructPath(inodeAttrs, i) + " (is not a directory)");
  }
  if (!hasPermission(inode, FsAction.EXECUTE)) {
   throw new AccessControlException(toAccessControlString(
     inode, constructPath(inodeAttrs, i), FsAction.EXECUTE));
  }
 }
}

/** Guarded by {@link FSNamesystem#readLock()} */
private void checkStickyBit(INodeAttributes[] inodes, int index)
  throws AccessControlException {
 INodeAttributes parent = inodes[index];
 if (!parent.getFsPermission().getStickyBit()) {
  return;
 }
 // If this user is the directory owner, return
 if (parent.getUserName().equals(getUser())) {
  return;
 }
 INodeAttributes inode = inodes[index + 1];
 // if this user is the file owner, return
 if (inode.getUserName().equals(getUser())) {
  return;
 }
 throw new AccessControlException(String.format(
   "Permission denied by sticky bit: user=%s, path=\"%s\":%s:%s:%s%s, " +
   "parent=\"%s\":%s:%s:%s%s", user,
   constructPath(inodes, index + 1),
   inode.getUserName(), inode.getGroupName(),
   inode.isDirectory() ? "d" : "-", inode.getFsPermission().toString(),
   constructPath(inodes, index),
   parent.getUserName(), parent.getGroupName(),
   parent.isDirectory() ? "d" : "-", parent.getFsPermission().toString()));
}

/** Guarded by {@link FSNamesystem#readLock()} */
private void checkStickyBit(INodeAttributes[] inodes, int index)
  throws AccessControlException {
 INodeAttributes parent = inodes[index];
 if (!parent.getFsPermission().getStickyBit()) {
  return;
 }
 // If this user is the directory owner, return
 if (parent.getUserName().equals(getUser())) {
  return;
 }
 INodeAttributes inode = inodes[index + 1];
 // if this user is the file owner, return
 if (inode.getUserName().equals(getUser())) {
  return;
 }
 throw new AccessControlException(String.format(
   "Permission denied by sticky bit: user=%s, path=\"%s\":%s:%s:%s%s, " +
   "parent=\"%s\":%s:%s:%s%s", user,
   constructPath(inodes, index + 1),
   inode.getUserName(), inode.getGroupName(),
   inode.isDirectory() ? "d" : "-", inode.getFsPermission().toString(),
   constructPath(inodes, index),
   parent.getUserName(), parent.getGroupName(),
   parent.isDirectory() ? "d" : "-", parent.getFsPermission().toString()));
}