Public bug reported:
In order to deal with the fact that users often modify /usr/bin/python
DistUpdgradeControler.py attempts to verify it is set to the correct version:
...
fs_default_version = os.readlink('/usr/bin/python')
except OSError as e:
logging.error("os.readlink failed (%s)" % e)
return False
if not fs_default_version in (expected_default,
os.path.join('/usr/bin', expected_default)):
...
This check fails to account for setups using update-alternatives. In
this case /usr/bin/python always points to another symlink ( i.e
/etc/alternatives/python). This makes the above check always fail
regardless of the python version actually running.
sys.version_info should be used instead as it makes no assumptions about
how python was invoked.
"%s.%s.%s"
%(sys.version_info[0],sys.version_info[1],sys.version_info[2])"%s.%s.%s"
%(sys.version[0],sys.version_info[1],sys.version_info[2])
Yields the version string (i.e '2.7.15') for the running python
interpreter.
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: dist-upgrade
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https://bugs.launchpad.net/bugs/1798872
Title:
_pythonSymlinkCheck fails to account for use of update-alternitives
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