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Description of problem:
Modifyrepo complains that "Compression compat not available" although man page says it is default compression method

Version-Release number of selected component (if applicable):
createrepo-0.9.9-23.el7.noarch

How reproducible:
always

Steps to Reproduce:
1. mkdir x && cd x/ && createrepo .
2. touch file
3. modifyrepo --compress-type compat file repodata/

Actual results:
...
Compression compat not available: Please choose from: gz, bz2, xz

Expected results:
compression compat available or this behaviour described in man page

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-2017:2024