compression: Prevent using incompatible 'lzma' module from pyliblzma

Try importing the 'lzma' module only in Python 3.3+, that is versions
known to have it built-in. This way, we can prevent accidentally
importing incompatible module using the same name, e.g. pyliblzma.

Bug: https://bugs.gentoo.org/643254

1 files changed, 7 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 45f7ce7..7acc9c3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = begin,py27,py34,py35,py36,pypy,pypy3,nodeps,end
+envlist = begin,py27,py34,py35,py36,pypy,pypy3,incompatible-lzma,nodeps,end
 # we operate on sources anyway
 skipsdist = True
 
@@ -54,6 +54,12 @@ basepython = python2.7
 deps =
 	coverage
 
+[testenv:incompatible-lzma]
+basepython = python2.7
+deps =
+	coverage
+	pyliblzma
+
 [testenv]
 commands = coverage run -p -m unittest discover -v