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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)

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:1931