CAS: User's Guide

Overview
Generating CAS credentials (cas-proxy-init)
>Using CAS credentials (cas-wrap)
CAS Service Data
Writing CAS clients
Performance Measurements

Using CAS credentials (cas-wrap)

The cas-wrap program runs a grid-enabled program, causing it to use previously-generated CAS credentials.Its syntax is:

cas-wrap [-t tag | -p proxyfile ] command args

Both versions of this command run:

command args

in an environment in which command will use a previously-generated CAS credential.The first form should be used if cas-proxy-init was run with a tag argument; for example,

An environment variable, GLOBUS_LOCATION, needs to be set to point to the GT3.2 install location. If CAS clients have been deployed, then this script is placed in GLOBUS_LOCATION/bin. This directory needs to be added to the PATH for it to be executed from other locations.:

% cas-wrap -t my-community gsincftp myhost.edu

The above command will look for a credential generated by a previous execution of:

% cas-proxy-init -t my-community

and then set the environment to use that credential while running the command:

% gsincftp myhost.edu

The second form should be used if cas-proxy-init was run with the –o option; for example:

% cas-wrap –p /path/to/my/cas/credential gsincftp myhost.edu 

will look for a credential generated by a previous execution of:

% cas-proxy-init –o /path/to/my/cas/credential 

and then set the environment to use that credential while running the command

% gsincftp myhost.edu

Most grid-enabled programs (specifically, most programs written using the Globus GSI libraries) will honor the environment variable X509_USER_PROXY ; if this variable is set, they will use its value as the name of a file containing the proxy credential to use when authenticating.A user could, for example, cause the gsincftp program to use CAS credentials by running these two commands:

% setenv X509_USER_PROXY /path/to/my/cas/credential 

The cas-wrap utility program works by running the specified command in an environment in which that variable is set.