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Cannot set env variables when ssh a network machine [closed]

asked 2014-07-11 09:02:38 -0500

Luis Ruiz gravatar image

updated 2016-03-18 07:32:44 -0500

I am trying to set up a network configuration between two machines. I already did all the steps mentioned in the ROS tutorials. This is my setup:

In PC1:

export ROS_MASTER_URI=https://${PC1_hostname}:11311
rosrun <package> <node>

In PC2:

export ROS_IP="$(ifconfig | perl -nle'/dr:(10\.85\.167\.\S+)/ && print $1')"
export ROS_HOSTNAME="<PC2_hostname>"
export ROS_MASTER_URI=https://${PC1_hostname}:11311
rosrun <package> <node>

I can trasmit data back and forth between the two machines using ROS.

Now, I want to start PC2 from PC1 using a launch file. ROS indeed get the connection from PC1 to PC2, but then the program fails when trying to run the node. I found that the error is because ROS is ssh-ing into PC2, and ssh does not allow to set environment variables, which means ROS was never sourced and there isn't any environment variables. My file is right since if I run the script locally it works.

I found this on the web, I tried some of the solutions with no success.

ssh environment variables

How to allow environment variables to be set when ssh into an external PC?

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Closed for the following reason the question is answered, right answer was accepted by Luis Ruiz
close date 2014-07-11 21:13:26.486849


Environment variables must be set when you ssh into another machine.

McMurdo gravatar image McMurdo  ( 2014-07-11 09:28:12 -0500 )edit

1 Answer

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answered 2014-07-11 17:49:09 -0500

ahendrix gravatar image

In the machine tag in your launch file, you need to specify the env-loader parameter. See:

Note that the requirements for the env-loader script are fairly strict. It should:

  • Be executable. ( run chmod a+x on it, and make sure the first line is #!/bin/bash )
  • Source ROS.
  • Set your other environment variables, such as ROS_MASTER_URI and ROS_IP
  • The last line MUST be exec "$@"

If you're still having trouble, please EDIT your question to include your launch file and the exact console output you get from trying launch it.

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This works!!! I had to put `exec "$@"` at the end of the `` file.

Luis Ruiz gravatar image Luis Ruiz  ( 2014-07-11 21:10:19 -0500 )edit

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Asked: 2014-07-11 09:02:38 -0500

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Last updated: Mar 18 '16