[gentoo-dev] portage without portage

[gentoo-dev] portage without portage

[Andrew Gaffney]

In an effort to better understand the way that Portage works, I'm trying to write a perl 
program that can generate a dependency tree like emerge does. Since I'm using Perl and not 
Python, I can't use the Portage API. Here is my code so far:

[code]
#!/usr/bin/perl -w

my $dbpath = '/usr/portage';
my $pkgregex =
     '^(.+?)'.                                   # name
     '-(\d+(?:\.\d+)*\w*)'.                      # version, eg 1.23.4a
     '((?:(?:_alpha|_beta|_pre|_rc)\d*)?)'.      # special suffix
     '((?:-r\d+)?)$';                            # revision, eg r12

my $pkg = shift;

$depend = `source ${dbpath}/${pkg}; echo \${DEPEND}; echo \${RDEPEND}`;
print $depend;

$useflags = `source /etc/make.conf; echo \${USE}`;
print $useflags;
[/code]

This gets me a nice list of the packages that the ebuild depends on. As for the USE flags, 
I only get the ones defined in /etc/make.conf, not the full set. Is there an easy way to 
do this?

-- 
Andrew Gaffney


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Re: [gentoo-dev] portage without portage

[Kumba]

Andrew Gaffney wrote:

> In an effort to better understand the way that Portage works, I'm trying 
> to write a perl program that can generate a dependency tree like emerge 
> does. Since I'm using Perl and not Python, I can't use the Portage API. 
> Here is my code so far:

All I can say is "good luck"...


> This gets me a nice list of the packages that the ebuild depends on. As 
> for the USE flags, I only get the ones defined in /etc/make.conf, not 
> the full set. Is there an easy way to do this?

You might try parsing /usr/portage/profiles/use.desc and 
/usr/portage/use.local.desc for all the use flags.


--Kumba

-- 
"Such is oft the course of deeds that move the wheels of the world: 
small hands do them because they must, while the eyes of the great are 
elsewhere."  --Elrond


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Re: [gentoo-dev] portage without portage

[Bartosch Pixa]

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On Mon, 2003-10-27 at 08:32, Andrew Gaffney wrote:
> In an effort to better understand the way that Portage works, I'm trying to write a perl 
> program that can generate a dependency tree like emerge does. Since I'm using Perl and not 
> Python, I can't use the Portage API. Here is my code so far:

you could try to use the portage API with the help of this:

http://search.cpan.org/~gaas/pyperl-1.0/Python-Object/lib/Python.pm

-- 
Bartosch Pixa
Gentoo Linux Developer                    http://www.gentoo.org

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Re: [gentoo-dev] portage without portage

[Andrew Gaffney]

Bartosch Pixa wrote:
> On Mon, 2003-10-27 at 08:32, Andrew Gaffney wrote:
> 
>>In an effort to better understand the way that Portage works, I'm trying to write a perl 
>>program that can generate a dependency tree like emerge does. Since I'm using Perl and not 
>>Python, I can't use the Portage API. Here is my code so far:
> 
> 
> you could try to use the portage API with the help of this:
> 
> http://search.cpan.org/~gaas/pyperl-1.0/Python-Object/lib/Python.pm

I think I'll just stick with what I know. For now, I'm just doing 'emerge info | grep USE' 
to get a complete list of USE flags. As for the DEPEND line, I'm using a regex to extract 
each item, although its not going too well.

[code]
while($deplist =~ /((\w+\?)?) (\(?) (\S+) (\)?)/cg) {
   print "$2 - $4\n";
}
[/code]

which is supposed to pull apart a string like:

nls? ( sys-devel/gettext ) media-sound/cdparanoia gif? ( media-libs/giflib 
media-libs/libungif )

and pull out each 'key? ( value )', 'key? ( value value )', or just 'value' where its 
alone. Anyone have any idea where I'm going wrong?

-- 
Andrew Gaffney


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Re: [gentoo-dev] portage without portage

[Kain]

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On Mon, Oct 27, 2003 at 10:16:38AM -0600, Andrew Gaffney wrote:
> nls? ( sys-devel/gettext ) media-sound/cdparanoia gif? ( media-libs/giflib 
> media-libs/libungif )
> 
> and pull out each 'key? ( value )', 'key? ( value value )', or just 'value' 
> where its alone. Anyone have any idea where I'm going wrong?
You need to write a state machine that runs over words in the full DEPEND text for the ebuild to determine the meaning of each word depending on what came previously (i.e. USEflag -> descend until finished with ( and ) and so on)
-- 
Bryon Roche
Professional {Developer,Guru,Mad Scientist}
<kain@kain.org>
PGP Key Fingerprint: FE0D EC23 6464 726A CD54  48D3 04AD 86FE 6878 ABD5
Success, recognition, and conformity are the bywords of the modern world where
everyone seems to crave the anesthetizing security of being identified with the
majority...Human salvation lies in the hands of the creatively maladjusted.
  -- Martin Luther King, Jr.

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Re: [gentoo-dev] portage without portage

[Nick Jones]

> I think I'll just stick with what I know. For now, I'm just doing 'emerge 
> info | grep USE' to get a complete list of USE flags. As for the DEPEND 
> line, I'm using a regex to extract each item, although its not going too 
> well.

You can't do it that way. Portage does a lot of calculations based on
things like virtuals, inherited-values, and eclasses. USE flags also
have the potential to change during dep calculation due to binary
package restrictions and eventually USE requirements as well.

The way you're getting USE is ok for single packages.

The DEPEND info isn't right. DEPEND, RDEPEND, and PDEPEND all can vary
inside of an eclass, and depending upon if they are unset, empty, or
set, they can affect the final output.

--NJ

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Re: [gentoo-dev] portage without portage

[Andrew Gaffney]

Nick Jones wrote:
>>I think I'll just stick with what I know. For now, I'm just doing 'emerge 
>>info | grep USE' to get a complete list of USE flags. As for the DEPEND 
>>line, I'm using a regex to extract each item, although its not going too 
>>well.
> 
> You can't do it that way. Portage does a lot of calculations based on
> things like virtuals, inherited-values, and eclasses. USE flags also
> have the potential to change during dep calculation due to binary
> package restrictions and eventually USE requirements as well.
> 
> The way you're getting USE is ok for single packages.
> 
> The DEPEND info isn't right. DEPEND, RDEPEND, and PDEPEND all can vary
> inside of an eclass, and depending upon if they are unset, empty, or
> set, they can affect the final output.

I'm just going to pretend I didn't hear any of that :) Something I'm curious about: what 
is the difference between the different *DEPEND lines?

-- 
Andrew Gaffney


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