Get the ros version installed using python code

asked 2019-10-16 15:25:14 -0600

sai krishna
101 ●6 ●8 ●10

Hello,

May I know which python package to used to find the ros version name and the detailed version number installed in my linux box.

TIA

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Are you specifically restricted to python or is bash OK?

stevemacenski ( 2019-10-16 16:14:31 -0600 )edit

And are you assuming you have sourced the setup file or not?

stevemacenski ( 2019-10-16 16:15:15 -0600 )edit

yes i'm trying to understand only in python and I have sourced setup.bash file. I have found the version numbers just by looking at the ros_master's 'package.xml' and 'common.h' in the roscpp package. But I wanted to just use the information in my python application.

sai krishna ( 2019-10-16 16:27:22 -0600 )edit

If you know what files theyre in, you can easily use python to crawl those files and extract the versions

stevemacenski ( 2019-10-16 16:30:54 -0600 )edit

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answered 2019-10-17 02:30:09 -0600

gvdhoorn
72924 ●188 ●1008 ●879 http://cor.tudelft.nl/

I have found the version numbers just by looking at the ros_master's 'package.xml' and 'common.h' in the roscpp package.

That is exactly how rosversion -d does it. See here:

mm = ManifestManager(PACKAGE_FILE)
path = mm.get_path(args.package)
package_manifest = os.path.join(path, 'package.xml')
if os.path.exists(package_manifest):
    from xml.etree.ElementTree import ElementTree
    try:
        root = ElementTree(None, package_manifest)
        version = root.findtext('version')
    except Exception:
        pass

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an ugly way to grep the version name is to create a subprocess pipe with the rosversion -d (or rosversion pkg_name for package version) command:

 new_proc = subprocess.Popen(["rosversion", "-d"], stdout=subprocess.PIPE)
 version_str = new_proc.communicate()[0]

pavel92 ( 2019-10-17 03:12:46 -0600 )edit

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