[scl.org] Question about generating RPMs that depend on SCLs (like python27)

Alan Robertson alanr at unix.sh
Wed Jul 16 19:21:02 UTC 2014 

Python 2.6 is required by ThingsInTheUniverse:

bash-4.1# rpm --erase python
error: Failed dependencies:
         python(abi) = 2.6 is needed by (installed) 
python-libs-2.6.6-52.el6.x86_64
         python(abi) = 2.6 is needed by (installed) 
pygpgme-0.1-18.20090824bzr68.el6.x86_64
         python(abi) = 2.6 is needed by (installed) 
python-pycurl-7.19.0-8.el6.x86_64
         python(abi) = 2.6 is needed by (installed) 
python-urlgrabber-3.9.1-9.el6.noarch
         python(abi) = 2.6 is needed by (installed) 
rpm-python-4.8.0-37.el6.x86_64
         python(abi) = 2.6 is needed by (installed) 
python-iniparse-0.3.1-2.1.el6.noarch
         python(abi) = 2.6 is needed by (installed) 
yum-metadata-parser-1.1.2-16.el6.x86_64
         python(abi) = 2.6 is needed by (installed) 
yum-3.2.29-43.el6.centos.noarch
         python(abi) = 2.6 is needed by (installed) 
mercurial-1.4-3.el6.x86_64
         python-sqlite is needed by (installed) 
yum-3.2.29-43.el6.centos.noarch
         python >= 2.4 is needed by (installed) 
yum-3.2.29-43.el6.centos.noarch
         python is needed by (installed) mercurial-1.4-3.el6.x86_64
         /usr/bin/python is needed by (installed) 
python-urlgrabber-3.9.1-9.el6.noarch
         /usr/bin/python is needed by (installed) 
yum-3.2.29-43.el6.centos.noarch
         /usr/bin/python is needed by (installed) gettext-0.17-16.el6.x86_64
         /usr/bin/python is needed by (installed) 
nfs-utils-1:1.2.3-39.el6.x86_64
         /usr/bin/python is needed by (installed) 
redhat-lsb-core-4.0-7.el6.centos.x86_64
         /usr/bin/python is needed by (installed) mercurial-1.4-3.el6.x86_64
         /usr/bin/python is needed by (installed) 
glib2-devel-2.26.1-7.el6_5.x86_64

Like, for example -- yum -- and glib2-devel (which I require), and 
gettext - so removing it is out of the question.

I've attached my current spec file.  The problem seems to be this:
     The pre-existing python automatic-dependency generator thinks I 
need python(abi) = 2.7.
     But the python27 package supplies python27-python(abi) = 2.7.

So, I need to do one of two things:
     1) turn off automatic dependency generation for python
     2) Force a different automatic dependency generation process to be 
used (one that is python27 aware)
             WITHOUT removing the "standard" RHEL6 python (which can't 
be done).

Does anyone know how to do either thing?

The first alternative seems to be the easier one,




On 07/16/2014 02:01 AM, Honza Horak wrote:
> On 07/16/2014 06:29 AM, Alan Robertson wrote:
>> So, I'm trying to take the page you pointed at seriously - so I added
>> this line from that page:
>>
>> BuildRequires: scl-utils-build
>>
>>
>> There is no such package.  What was intended here?
>
> This package is included in optional channel, but you shouldn't need 
> it, because you are preparing non-SCL package and scl-utils-build is 
> intended only for building SCL packages.
>
> Anyway, what is obviously wrong in your case is generating the python 
> requirements. These generators are delivered in python-devel and 
> python27-python-devel packages. So, if I'm not mistaken, your package 
> (and building environment) must include python27-python-devel but not 
> python-devel. In spec file you should have:
>   BuildRequires: python27-python-devel
>
> But be careful about packages installed during building (if you build 
> in your working environment), since I'm not sure which package gets 
> preference in case both python-devel and python27-python-devel are 
> installed.
>
> Regards,
> Honza
>
>>
>>
>> On 07/15/2014 04:09 PM, Orion Poplawski wrote:
>>> On 07/15/2014 04:06 PM, Orion Poplawski wrote:
>>>> On 07/15/2014 03:55 PM, Alan Robertson wrote:
>>>>> OK.  It was pointed out to me off-list that I was comparing the
>>>>> wrong thing.
>>>>> I should have been looking at python27-python.  Here's what that
>>>>> package shows:
>>>>>
>>>>> bash-4.1# *rpm -q --provides python27-python*
>>>>> python27-python-abi = 2.7
>>>>> python27-python(abi) = 2.7
>>>>> python27-Distutils
>>>>> python27-python2 = 2.7.5
>>>>> python27-python-sqlite = 2.3.2
>>>>> python27-python-ctypes = 1.0.1
>>>>> python27-python-hashlib = 20081120
>>>>> python27-python-uuid = 1.31
>>>>> python27-python-argparse = 2.7.5-7.el6.centos.alt
>>>>> python27-python = 2.7.5-7.el6.centos.alt
>>>>> python27-python(x86-64) = 2.7.5-7.el6.centos.alt
>>>>> bash-4.1#
>>>>>
>>>>> Either I'm failing to do something to appease the automagical
>>>>> python-version
>>>>> detection (which I have no idea how it figures that out), or the
>>>>> property
>>>>> names in python27-python should not have the "python27-" prefix.
>>>>>
>>>>> Anyone know which it is - and how to deal with it?
>>>>>
>>>>> It seems to me like the attributes of the provides should not be
>>>>> prefixed by
>>>>> python27.  But I'm new to this SCL stuff...
>>>>
>>>> FWIW - they "python(abi) = ##" requires is added by
>>>> /usr/lib/rpm/pythondeps.sh
>>>> as part of the standard rpm dependency generation.  So yes, for this
>>>> to work
>>>> with the scl, either the scl needs to provide "python(abi) = 2.7" or
>>>> you will
>>>> need to disable the automatic requires generation or filter out the
>>>> python(abi) line.
>>>>
>>>> We're all new to this SCL stuff.... :)
>>>>
>>>>
>>>
>>> Here's the magic from
>>> https://access.redhat.com/documentation/en-US/Red_Hat_Developer_Toolset/2/html/Software_Collections_Guide/sect-Extending_the_python27_and_python33_Software_Collections.html 
>>>
>>>
>>>
>>> # Similarly, override __python_requires for automatic dependency
>>> generator
>>> %global __python_requires %{%{scl_python}_python_requires}
>>>
>>>
>>
>>
>> -- 
>>      Alan Robertson<alanr at unix.sh>  - @OSSAlanR
>>
>> "Openness is the foundation and preservative of friendship... Let me 
>> claim from you at all times your undisguised opinions." - William 
>> Wilberforce
>>
>


-- 
     Alan Robertson <alanr at unix.sh> - @OSSAlanR

"Openness is the foundation and preservative of friendship...  Let me claim from you at all times your undisguised opinions." - William Wilberforce

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