ROS学习手记12 -- ROS问题检测工具roswtf
2015-07-15 11:18
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roswtf - ros, what the fuck? 其实很好记~~
roswtf tool.
Keywords: roswtf
Tutorial Level: BEGINNER
Next Tutorial:
Navigating the wiki
目录
Checking your installation
Trying it online
Errors
Before you start this tutorial, please make sure your
roscore is NOT running.
You should see (detail of the output varies):
If your installation ran correctly you should output similar to the above. The output is telling you:
"Stack: ros":
roswtf uses whatever your current directory is to determine what checks it does. This is telling us that you started
roswtf in the ros stack.
"Static checks summary": this is a report on any filesystem issues. It's telling us that there were no errors.
"Cannot communicate with master, ignoring graph checks": the
roscore isn't running, so roswtf didn't do any online checks.
Master to be up, so go ahead and start a roscore.
Now, try running the same sequence again:
You should see:
roswtf did some online examination of your graph now that your
roscore is running. Depending on how many ROS nodes you have running, this can take a long time to complete. As you can see, this time it produced a warning:
roswtf is warning you that the
rosout node is subscribed to a topic that no one is publishing to. In this case, this is expected because nothing else is running, so we can ignore it.
For this part, we are going to set your ROS_PACKAGE_PATH to a
bad value. We're also going to stop our roscore to simplify the output that you see.
This time we see:
As you can see, roswtf now gives us an error about the
ROS_PACKAGE_PATH setting.
There are many other types of problems that
roswtf can find. If you find yourself stumped by a build or communication issue, try running it and seeing if it can point you in the right direction.
Now that you know how to use roswtf, take sometime to learn more about how ros.org is structured and
navigating the wiki.
Getting started with roswtf
Description: Basic introduction to theroswtf tool.
Keywords: roswtf
Tutorial Level: BEGINNER
Next Tutorial:
Navigating the wiki
目录
Checking your installation
Trying it online
Errors
Before you start this tutorial, please make sure your
roscore is NOT running.
Checking your installation
roswtf examines your system to try and find problems. Let's try it out:$ roscd $ roswtf
You should see (detail of the output varies):
Stack: ros ================================================================================ Static checks summary: No errors or warnings ================================================================================ Cannot communicate with master, ignoring graph checks
If your installation ran correctly you should output similar to the above. The output is telling you:
"Stack: ros":
roswtf uses whatever your current directory is to determine what checks it does. This is telling us that you started
roswtf in the ros stack.
"Static checks summary": this is a report on any filesystem issues. It's telling us that there were no errors.
"Cannot communicate with master, ignoring graph checks": the
roscore isn't running, so roswtf didn't do any online checks.
Trying it online
For this next step, we want aMaster to be up, so go ahead and start a roscore.
Now, try running the same sequence again:
$ roscd $ roswtf
You should see:
Stack: ros ================================================================================ Static checks summary: No errors or warnings ================================================================================ Beginning tests of your ROS graph. These may take awhile... analyzing graph... ... done analyzing graph running graph rules... ... done running graph rules Online checks summary: Found 1 warning(s). Warnings are things that may be just fine, but are sometimes at fault WARNING The following node subscriptions are unconnected: * /rosout: * /rosout
roswtf did some online examination of your graph now that your
roscore is running. Depending on how many ROS nodes you have running, this can take a long time to complete. As you can see, this time it produced a warning:
WARNING The following node subscriptions are unconnected: * /rosout: * /rosout
roswtf is warning you that the
rosout node is subscribed to a topic that no one is publishing to. In this case, this is expected because nothing else is running, so we can ignore it.
Errors
roswtf will warn you about things that look suspicious but may be normal in your system. It can also report errors for problems that it knows are wrong.For this part, we are going to set your ROS_PACKAGE_PATH to a
bad value. We're also going to stop our roscore to simplify the output that you see.
$ roscd $ ROS_PACKAGE_PATH=bad:$ROS_PACKAGE_PATH roswtf
This time we see:
Stack: ros ================================================================================ Static checks summary: Found 1 error(s). ERROR Not all paths in ROS_PACKAGE_PATH [bad] point to an existing directory: * bad ================================================================================ Cannot communicate with master, ignoring graph checks
As you can see, roswtf now gives us an error about the
ROS_PACKAGE_PATH setting.
There are many other types of problems that
roswtf can find. If you find yourself stumped by a build or communication issue, try running it and seeing if it can point you in the right direction.
Now that you know how to use roswtf, take sometime to learn more about how ros.org is structured and
navigating the wiki.
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