Tutorial:
Object permissions

Table of Contents

  Other relevant on-line documents:

Logging in to a running Legion system Legion graphical user interface Introduction to Legion context space Context-related commands How to start remote programs in Legion Object permissions Legion tty objects Running an MPI code in Legion

Running a PVM code in Legion Quick list of all Legion commands Usage of all Legion commands Starting and shutting down Legion 1.4 Using Legion security features Legion host and vault objects Adding host and vault objects The list of all on-line 1.4 tutorials

Depending on how your system is set up, you may need to set up your access to your system before you can run Legion commands. This will probably involve running a command such as this:

$ . ~LEGION/setup.sh

or

$ source ~LEGION/setup.csh

If your system administrator has enabled Legion security, the objects that you create while logged in cannot be used by any other users. If you wish to share your objects you will need to give other users permission to read, write, or execute objects.

For our purposes, "read" methods are defined as methods that obtain but do not modify an object's state, "write" methods are methods that modify an object's state, and "execute" methods are methods that run an object.

This command works on common Legion object types: context, file, class, tty, implementation, host, and vault objects all fall into this category.

You can use the legion_change_permissions command to give other users permission to read, write, or execute your objects. There are specific lags to add [+] or remove [-] read, write, or execute permissions on objects. So, if you wanted to allow user bob to be able to read your file object foo, you would enter:

$ legion_change_permissions +r /users/bob foo

This lets bob "read" your object foo.