[gentoo-user] How to find all packages which need Python2_7

[gentoo-user] How to find all packages which need Python2_7

[Helmut Jarausch]

Hi,

I'd like to install all packages which need Python, only for Python3 except those which cannot be installed for Python3.
How can I find out which of the packages installed on my machine have PYTHON_TARGETS=python2_7" (only).
I could loop over `qlist -IC` do an emerge -vp each grepping for this string.
But is there an easier way. 

Many thanks for a hint,
Helmut

Re: [gentoo-user] How to find all packages which need Python2_7

[Andrew Savchenko]

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Hello,

On Tue, 03 Mar 2015 10:21:19 +0100 Helmut Jarausch wrote:
> Hi,
> 
> I'd like to install all packages which need Python, only for Python3 except those which cannot be installed for Python3.
> How can I find out which of the packages installed on my machine have PYTHON_TARGETS=python2_7" (only).
> I could loop over `qlist -IC` do an emerge -vp each grepping for this string.
> But is there an easier way. 

You are almost there, just learn the power of mighty eix:

EIX_LIMIT=0 eix -I --only-names -\( -U python_targets_python2_ -! -U python_targets_python3_ -\)

This will return you all installed packages having "python2_*" in
their python targets, but not having "python3_*".

Best regards,
Andrew Savchenko

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Re: [gentoo-user] How to find all packages which need Python2_7

[Andrew Savchenko]

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On Tue, 3 Mar 2015 12:47:46 +0300 Andrew Savchenko wrote:
> EIX_LIMIT=0 eix -I --only-names -\( -U python_targets_python2_ -! -U python_targets_python3_ -\)

On second though parenthesis are surplus here:

EIX_LIMIT=0 eix -I --only-names -U python_targets_python2_ -! -U python_targets_python3_

Though be aware that some python2-only packages will require
python2 support from packages supporting multiple python
versions.

Best regards,
Andrew Savchenko

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Re: [gentoo-user] How to find all packages which need Python2_7

[Helmut Jarausch]

On 03/03/2015 10:47:46 AM, Andrew Savchenko wrote:
> Hello,
> 
> On Tue, 03 Mar 2015 10:21:19 +0100 Helmut Jarausch wrote:
> > Hi,
> > 
> > I'd like to install all packages which need Python, only for Python3
> except those which cannot be installed for Python3.
> > How can I find out which of the packages installed on my machine
> have PYTHON_TARGETS=python2_7" (only).
> > I could loop over `qlist -IC` do an emerge -vp each grepping for
> this string.
> > But is there an easier way. 
> 
> You are almost there, just learn the power of mighty eix:
> 
> EIX_LIMIT=0 eix -I --only-names -\( -U python_targets_python2_ -! -U
> python_targets_python3_ -\)
> 
> This will return you all installed packages having "python2_*" in
> their python targets, but not having "python3_*".
> 

Many thanks Andrew.
I have some problems, though.

Your command shows media-libs/mesa (among many others)
but
emerge -vp media-libs/mesa doesn't show any python targets.

Thanks again,
Helmut

Re: [gentoo-user] How to find all packages which need Python2_7

[Andrew Savchenko]

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On Tue, 03 Mar 2015 11:12:48 +0100 Helmut Jarausch wrote:
> On 03/03/2015 10:47:46 AM, Andrew Savchenko wrote:
> > Hello,
> > 
> > On Tue, 03 Mar 2015 10:21:19 +0100 Helmut Jarausch wrote:
> > > Hi,
> > > 
> > > I'd like to install all packages which need Python, only for Python3
> > except those which cannot be installed for Python3.
> > > How can I find out which of the packages installed on my machine
> > have PYTHON_TARGETS=python2_7" (only).
> > > I could loop over `qlist -IC` do an emerge -vp each grepping for
> > this string.
> > > But is there an easier way. 
> > 
> > You are almost there, just learn the power of mighty eix:
> > 
> > EIX_LIMIT=0 eix -I --only-names -\( -U python_targets_python2_ -! -U
> > python_targets_python3_ -\)
> > 
> > This will return you all installed packages having "python2_*" in
> > their python targets, but not having "python3_*".
> > 
> 
> Many thanks Andrew.
> I have some problems, though.
> 
> Your command shows media-libs/mesa (among many others)
> but
> emerge -vp media-libs/mesa doesn't show any python targets.

Run plain:
$ eix media-libs/mesa
It has PYTHON_TARGETS="python2_7", though probably not in the
version currently installed in your system. Please don't forget,
that USE flag may appear and disappear during upgrades or
downgrades.


Best regards,
Andrew Savchenko

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