[gentoo-portage-dev] Re: [RFC] Location of Portage bash API (outside of ebuilds)

[Ryan Hill]

On Wed, 5 Feb 2014 20:57:24 +0100
Arfrever Frehtes Taifersar Arahesis <arfrever.fta@×××××.com> wrote:

> 2014-02-05 09:08 Mike Frysinger napisał(a):
> > On Saturday, February 01, 2014 21:08:11 Arfrever Frehtes Taifersar Arahesis
> > wrote:
> > > bin/isolated-functions.sh contains at least 1 useful function, which could
> > > be exposed for external consumers (without __ prefix), but must have
> > > private name (with __ prefix) when bin/isolated-functions.sh is used in
> > > ebuild environment.
> >
> > who are these mysterious external consumers ?
>
> E.g. euse, gentoo-bashcomp and potentially other tools written in bash, which
> need some data from configuration of repositories.
>
> I would like to provide 3 functions:
> - repos_read_config()
>   This function would use portageq to set PORTAGE_REPOSITORIES in environment.
>
>   repos_read_config() {
>     eval "$(portageq envvar -v PORTAGE_REPOSITORIES)"
>   }
>
>   If external consumer needs also other variables, then it can directly use:
>   eval "$(portageq envvar -v PORTAGE_REPOSITORIES VAR1 VAR2 VAR3)"
>
> - repos_list()
>   This function would print list of names of repositories.
>
> - repo_attr()
>   This function would print value of specified attribute (${2}) for specified
> repository (${1}). This function would call __repo_attr() function currently
> defined in bin/isolated-functions.sh.
>
> Example code:
>   . portage.bash
>   repos_read_config
>   for repo in $(repos_list); do
>     location=$(repo_attr ${repo} location)
>     …
>   done
>
> Calling portageq multiple times would be too slow for some tools.
>
> gentoo-bashcomp contains a custom implementation of parser of repos.conf,
> which could be replaced by calls to functions provided by Portage:
> http://git.overlays.gentoo.org/gitweb/?p=proj/gentoo-bashcomp.git;a=commitdiff;h=bf91db09a102544196b21cd792ac423262656a9a

Calling portageq once is too slow for gentoo-bashcomp. :/  That parser is
terrible, but it's 1000x faster than going through portage.


-- 
Ryan Hill                        psn: dirtyepic_sk
   gcc-porting/toolchain/wxwidgets @ gentoo.org

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