On 11.12.2015 19:01, Tomas Babej wrote:



On 12/11/2015 09:36 AM, Martin Kosek wrote:
On 12/10/2015 05:09 PM, Martin Basti wrote:


On 10.12.2015 15:49, Tomas Babej wrote:

On 12/10/2015 11:23 AM, Martin Basti wrote:

On 10.12.2015 09:13, Lukas Slebodnik wrote:
On (09/12/15 19:22), Martin Basti wrote:
https://fedorahosted.org/freeipa/ticket/5535

Patch attached.
>From 8ef93485d61e8732166fb0c5b6c4559209740f3e Mon Sep 17 00:00:00
2001
From: Martin Basti <mba...@redhat.com>
Date: Wed, 9 Dec 2015 18:53:35 +0100
Subject: [PATCH] Fix version comparison

Use RPM library to compare vendor versions of IPA for redhat platform

https://fedorahosted.org/freeipa/ticket/5535
---
freeipa.spec.in             |  2 ++
ipaplatform/redhat/tasks.py | 19 +++++++++++++++++++
2 files changed, 21 insertions(+)

diff --git a/freeipa.spec.in b/freeipa.spec.in
index
9f82b3695fb10c4db65cc31278364b3b34e26098..09feba7b8324f5e645da3e8010de86b6c3ee5ab9


100644
--- a/freeipa.spec.in
+++ b/freeipa.spec.in
@@ -166,6 +166,8 @@ Requires: %{etc_systemd_dir}
Requires: gzip
Requires: python-gssapi >= 1.1.0
Requires: custodia
+Requires: rpm-python
+Requires: rpmdevtools
Could you explain why do you need the 2nd package?
It does not contains any python modules
and I cannot see usage of any binary in this patch

LS
Thanks for this catch, it is actually located in yum package, I rather
copy stringToVersion function from there to IPA, to avoid dependency
hell

Updated patch attached.


Looking good. The __cmp__ function, however, is not available in Python
3. As we will eventually support python3 in RHEL as well, maybe we
should make sure even platform-dependent parts are python3 compatible?
For the future's sake.

Tomas

Thanks,

python 3 compatible patch attached.

I wonder why we have to add so much code here and reimplement RPM
version checking if it is already provided by rpmdevtools:

~~~
$ /usr/bin/rpmdev-vercmp ipa-4.2.0-15.el7 4.2.0-15.el7_2.3; echo $?
WARNING: hyphen in release1: 4.2.0-15.el7

rpmdev-vercmp <epoch1> <ver1> <release1> <epoch2> <ver2> <release2>
rpmdev-vercmp <EVR1> <EVR2>
rpmdev-vercmp # with no arguments, prompt

Exit status is 0 if the EVR's are equal, 11 if EVR1 is newer, and 12 if
EVR2
is newer.  Other exit statuses indicate problems.

ipa-4.2.0-15.el7 < 4.2.0-15.el7_2.3
12
~~~

which could be directly called from __eq__ or __lt__, since we are in
platform specific code anyway already.

Martin

Imho we should generally prefer reaching out to a Python library rather
launching a subprocess to compare the versions, it's unnecessary overhead.

That said, the main argument for the usage of rpm-python over
rpmdevtools I see is that rpm-python is very likely to be present on the
system (i.e. it is yum's own dependency), while rpmdevtools will not be
present by default.

 From the standpoint of trying to minimize the size of freeipa
installation (i.e recent wget -> curl migration), we should keep the
spirit here and do not introduce a dependency for a collection of
developer tools.

/2 cents

+1, also a single function is hardly "much code".

--
Jan Cholasta

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