[Freeipa-devel] [freeipa PR#254][comment] Replace LooseVersion with pkg_resource.parse_version

[martbab]

  URL: https://github.com/freeipa/freeipa/pull/254
Title: #254: Replace LooseVersion with pkg_resource.parse_version

martbab commented:
"""
It seems that your changes broke IPA upgrade:

```
Done configuring the web interface (httpd).
Applying LDAP updates
Upgrading IPA:
  [1/9]: stopping directory server
  [2/9]: saving configuration
  [3/9]: disabling listeners
  [4/9]: enabling DS global lock
  [5/9]: starting directory server
  [6/9]: upgrading server
ipa         : ERROR    Upgrade failed with 'SetuptoolsVersion' object has no attribute 'version'
  [error] RuntimeError: 'SetuptoolsVersion' object has no attribute 'version'
  [cleanup]: stopping directory server
  [cleanup]: restoring configuration
ipa.ipapython.install.cli.install_tool(CompatServerMasterInstall): ERROR    Update failed: 'SetuptoolsVersion' object has no attribute 'version'
ipa.ipapython.install.cli.install_tool(CompatServerMasterInstall): ERROR    The ipa-server-install command failed. See /var/log/ipaserver-install.log for more information
11-21 18:49 ipadocker.cli ERROR    Command ipa-server-install -U --domain ipa.test --realm IPA.TEST -p Secret123 -a Secret123 --setup-dns --auto-forwarders failed (exit code 1)
```
Traceback in ipaserver-install.log:

```
# tail -n 50  /var/log/ipaserver-install.log 
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 481, in __runner
    exc_handler(exc_info)
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 510, in _handle_execute_exception
    self._handle_exception(exc_info)
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 500, in _handle_exception
    six.reraise(*exc_info)
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 471, in __runner
    step()
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 468, in <lambda>
    step = lambda: next(self.__gen)
  File "/usr/lib/python2.7/site-packages/ipapython/install/util.py", line 81, in run_generator_with_yield_from
    six.reraise(*exc_info)
  File "/usr/lib/python2.7/site-packages/ipapython/install/util.py", line 59, in run_generator_with_yield_from
    value = gen.send(prev_value)
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 705, in _configure
    next(executor)
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 481, in __runner
    exc_handler(exc_info)
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 510, in _handle_execute_exception
    self._handle_exception(exc_info)
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 568, in _handle_exception
    self.__parent._handle_exception(exc_info)
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 500, in _handle_exception
    six.reraise(*exc_info)
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 565, in _handle_exception
    super(ComponentBase, self)._handle_exception(exc_info)
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 500, in _handle_exception
    six.reraise(*exc_info)
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 471, in __runner
    step()
  File "/usr/lib/python2.7/site-packages/ipapython/install/core.py", line 468, in <lambda>
    step = lambda: next(self.__gen)
  File "/usr/lib/python2.7/site-packages/ipapython/install/util.py", line 81, in run_generator_with_yield_from
    six.reraise(*exc_info)
  File "/usr/lib/python2.7/site-packages/ipapython/install/util.py", line 59, in run_generator_with_yield_from
    value = gen.send(prev_value)
  File "/usr/lib/python2.7/site-packages/ipapython/install/common.py", line 63, in _install
    for _nothing in self._installer(self.parent):
  File "/usr/lib/python2.7/site-packages/ipaserver/install/server/__init__.py", line 575, in main
    master_install(self)
  File "/usr/lib/python2.7/site-packages/ipaserver/install/server/install.py", line 265, in decorated
    func(installer)
  File "/usr/lib/python2.7/site-packages/ipaserver/install/server/install.py", line 851, in install
    ds.apply_updates()
  File "/usr/lib/python2.7/site-packages/ipaserver/install/dsinstance.py", line 693, in apply_updates
    raise RuntimeError("Update failed: %s" % e)

2016-11-21T17:49:45Z DEBUG The ipa-server-install command failed, exception: RuntimeError: Update failed: 'SetuptoolsVersion' object has no attribute 'version'
2016-11-21T17:49:45Z ERROR Update failed: 'SetuptoolsVersion' object has no attribute 'version'
2016-11-21T17:49:45Z ERROR The ipa-server-install command failed. See /var/log/ipaserver-install.log for more information
```
"""

See the full comment at https://github.com/freeipa/freeipa/pull/254#issuecomment-262018483