Python library wrapping Globus Toolkit credential library

pip install glopy==0.2



globy is a Python library wrapping parts of the Globus Toolkit. It is intentionally written by hand and not with SWIG, to make it easy to develop and audit the specific functionality required by Globus Online.

glopy is pronounced gloppy; the jalopy pronunciation never caught on and is now deprecated. It is short for GLObus PYthon.


See for the generated API documentation.

Currently only supports loading and verifying certificate chains and credentials, by wrapping globus_gsi_credential. For example:

import glopy

c = glopy.Credential()
print "identity =", c.get_identity()
print "subject =", c.get_subject()
print "goodtill =", c.get_goodtill()
except glopy.error as e:
    print "Verify Failed:", str(e)
    print "Verify OK"

It works even when no private key is present (a certificate chain), and it understands proxy certificates.

A single credential object can be re-used to load and verify many certificates and proxies, from files and from strings, within a single thread. However it is NOT THREAD SAFE, so each thread should have it's own object.


glopy requires Globus Toolkit 5.2 or 6.0 and python 2.6 or 2.7.

On debian and ubuntu, using python 2.7 (recommended) as an example:

apt-get install python2.7-dev pkg-config

If using the official GT packages (tested on ubuntu 14.04 with GT 6):

apt-get install libglobus-gss-assist-dev libglobus-gsi-credential-dev


To build and install using python 2.7:

# export PKG_CONFIG_PATH=/usr/local/globus/lib/pkgconfig
python2.7 install

Setting PKG_CONFIG_PATH should not be necessary if using the official GT packages. Use sudo if doing a system wide install, or use the --user option to install in the current user's home directory.

Known Issues

If you get "fatal error: io.h: No such file or directory" when building, set


In particular this seems to be caused by a bug in the python2.7-minimal package on Debian wheezy.

If you get the following Python exception when creating a glopy.Credential object:

glopy.error: globus_sysconfig: Could not find a valid trusted CA certificates directory: The trusted certificates directory could not be found in any of the following locations:
1) env. var. X509_CERT_DIR
2) $HOME/.globus/certificates
3) /etc/grid-security/certificates
4) $GLOBUS_LOCATION/share/certificates

you need to create a certificates directory at one of the suggested locations.