[gentoo-user] which ebuilds use a specific eclass?

[gentoo-user] which ebuilds use a specific eclass?

[James]

Ok, so googling found lots of interesting things to read; some deprecated
some new.

So looking more deeply into some of the eclasses [1], it helps me to examine
different ebuilds an eclass is inherited into; then specifically how
those eclass constructs are used, by subsequently looking into a specific
ebuild.


Evidently, I'm not alone in this adventure as I have read lots of stuff
about folks not choosing the best eclass to use for a specific task, not
using a given eclass correctly and new (eclass) features that should be used
which have been added to an existing eclass or as part of a new eclass.
Surely this can be very dynamic, but, I'm mostly hacking at relatively
straightforward ebuilds, so the existing semantics are probably fine for me
in most cases, no bleeding edges here.


So for a given eclass, how to I find the list of all ebuilds that use
that eclass I'm interested in? Is my only option a brute force search
of the "inherit" inside every ebuild?  What if I only want to look at
an eclass, like systemd, limited to a specific category of ebuilds, for
example sys-cluster; what is the best tool/script to search for a specific
eclass limited to a single category?


James


[1] https://devmanual.gentoo.org/eclass-reference/index.html

Re: [gentoo-user] which ebuilds use a specific eclass?

[Neil Bothwick]

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On Thu, 19 Feb 2015 20:38:18 +0000 (UTC), James wrote:

> So for a given eclass, how to I find the list of all ebuilds that use
> that eclass I'm interested in? Is my only option a brute force search
> of the "inherit" inside every ebuild?

Well, brute force works

grep -Er 'inherit.*systemd' /var/portage

That shows every ebuild, you may want to reduce it to a list of packages
with something like:

for i in $(grep -Erl 'inherit.*systemd' /var/portage)
do
	dirname $i
done | sort -u


> What if I only want to look at
> an eclass, like systemd, limited to a specific category of ebuilds, for
> example sys-cluster; what is the best tool/script to search for a
> specific eclass limited to a single category?

grep works again, just search the category directory(s).


-- 
Neil Bothwick

Why marry a virgin? If she wasn't good enough for the rest of them, then
she isn't good enough for you.

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[gentoo-user] Re: which ebuilds use a specific eclass?

[James]

Neil Bothwick <neil <at> digimed.co.uk> writes:


> > So for a given eclass, how to I find the list of all ebuilds 
> Well, brute force works

> grep -Er 'inherit.*systemd' /var/portage

'/usr/portage/' works for me, when bruting.

> That shows every ebuild, you may want to reduce it to a list of packages

> for i in $(grep -Erl 'inherit.*systemd' /var/portage)
> do
> 	dirname $i
> done | sort -u


Yea, sure, cool.  (THANKS). However, I was looking for (wink wink nudge
nudge) something sexy, using VDB (/var/db/pkg/) along the lines of 
a Directed Acyclic Graph  (DAG) [1] solution in haskell/charm or python.

Sure shell works, and works well, but, surely GLEP 64 will bring us
something new and cool? Anthony, is one of the devs that continues to
'surprise' and insprire this old hack......

I figured Rich already has code, he has not put out, just yet.
(only teasing about haskell/charm, but, not really).... 


thx,
James

[1] http://ericsink.com/vcbe/html/directed_acyclic_graphs.html

Re: [gentoo-user] Re: which ebuilds use a specific eclass?

[Neil Bothwick]

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On Thu, 19 Feb 2015 22:56:20 +0000 (UTC), James wrote:

> Neil Bothwick <neil <at> digimed.co.uk> writes:

> > > So for a given eclass, how to I find the list of all ebuilds 
> > Well, brute force works
> 
> > grep -Er 'inherit.*systemd' /var/portage
> 
> '/usr/portage/' works for me, when bruting.

Yes, I'd forgot to adjust for my moving the portage tree to a more
logical location :)
 
> > That shows every ebuild, you may want to reduce it to a list of
> > packages
> 
> > for i in $(grep -Erl 'inherit.*systemd' /var/portage)
> > do
> > 	dirname $i
> > done | sort -u
> 
> 
> Yea, sure, cool.  (THANKS). However, I was looking for (wink wink nudge
> nudge) something sexy, using VDB (/var/db/pkg/)

That only shows installed packages. If you want something a little more
portagey, you could use qgrep.


-- 
Neil Bothwick

Disinformation is not as good as datinformation.

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