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+++ This bug was initially created as a clone of Bug #1570864 +++

Description of problem:

This is a regression introduced in RHEL-6.9. Previously createrepo was not crashing.

# createrepo --compress-type foo .
Compression foo not available: Please choose from: gz, bz2
Traceback (most recent call last):
  File "/usr/share/createrepo/genpkgmetadata.py", line 307, in <module>
    main(sys.argv[1:])
  File "/usr/share/createrepo/genpkgmetadata.py", line 287, in main
    tmp = os.path.join(conf.outputdir, conf.tempdir)
  File "/usr/lib/python2.6/posixpath.py", line 67, in join
    elif path == '' or path.endswith('/'):
AttributeError: 'NoneType' object has no attribute 'endswith'

It was introduced by the following change:

* Fri Nov 04 2016 Valentina Mukhamedzhanova <vmukhame> - 0.9.9-26 - Fix temporary files cleanup. - Resolves: bug#1297642


How reproducible:
always

Steps to Reproduce:
see above

Actual results:
traceback

Expected results:
previously the default compress type was used (discussed in bug 886589 closed as WONTFIX)

Forgot to mention that this is valid for rhel-7.6 too, createrepo-0.9.9-28.el7

There is no plan to fix this bug during RHEL 7 life cycle.
If you still consider the issue important, please contact your support representative.