News / 19 May 2015

Distributing and using iCommands in user-land

Given a user community who does not have root access to their machines, the ability to distribute the iCommands and use them from within a user's home directory would be desirable.  We will discuss how to build, bundle and configure the iCommands for use by a user on a linux platform without root access.

Building the iCommands

Starting from a clean irods repository, from within the top level directory run the command:
dan_admin:~/irods$ ./packaging/ -r icommands
The build script will download the external libraries, compile the iRODS client library, and then compile the iCommands. EPM will be used to package the iCommands into either a deb or rpm file. This we will ignore and instead use a new script to build a tar file containing all of the appropriate iCommand binaries and related client-side plugins. From the top level of the iRODS repository, run:
dan_admin:~/irods$ ./packaging/
This short script will create an 'icommands' directory and copy the iCommand binaries into it. It will create a plugins directory which will include the basic authentication and networking plugins, then tar it up for distribution to other users.

Using the iCommands

Once the tar file has been expanded into a user's home directory the user will need to set the PATH to the iCommands and then set up the iRODS environment before authenticating against their Zone. Assuming the iCommands now reside in the home directory of joe_user, using a bash shell as an example the user needs to amend their PATH environment variable and verify that the iCommands are now in the path:

joe_user:~$ export PATH=/home/joe_user/icommands:$PATH joe_user:~$ which ils /home/joe_user/icommands/ils
Once the iCommands are successfully included in the user's PATH, the iRODS client environment needs to be bootstrapped. The user should make the iRODS environment directory and create an empty environment file:

joe_user:~$ mkdir .irods joe_user:~$ touch .irods/irods_environment.json
Once this is done, the irods_environment.json file will need to be pointed towards the location of the client-side plugins in order for the 'iinit' command to finish the bootstrapping process. Using their favorite editor the user needs to add a few lines to .irods/irods_environment.json:
{ "irods_plugins_home" : "/home/joe_user/icommands/plugins/" }
After the location of the plugins is made available to the iCommands, the user can run 'iinit' to finish setting up the iRODS client environment:

joe_user:~$ iinit One or more fields in your iRODS environment file (irods_environment.json) are missing; please enter them. Enter the host name (DNS) of the server to connect to: Enter the port number: 1247 Enter your irods user name: joe Enter your irods zone: joeZone Those values will be added to your environment file (for use by other i-commands) if the login succeeds. Enter your current iRODS password:
At this point the user has a valid iRODS environment and can begin using the iCommands.
joe_user:~$ ils /joeZone/home/joe:
Also, it is important to note that there are a number of additional parameters available for modification based on the needs of the client as well as the iRODS server's configuration.

Jason Coposky