[yocto] Mapping root filesystem files back into packages

[Paul Eggleton]

Hi Ulf,

On Mon, 18 Jan 2016 10:56:41 Ulf Magnusson wrote:
> To support an in-house packaging format, we need to partition the root
> filesystem into a number of packages (called "internal packages" from
> here on to avoid confusion), where each internal package corresponds
> to a number of (e.g. IPK) packages.
> 
> The way this is currently done is by manually maintaining a database
> (implemented as a PACKAGE_CLASSES class) that maps files in the root
> filesystem back to packages, along with a list of what packages should
> go into each internal package. I suspect it is done this way so that
> post-processing steps on the root filesystem will be included in the
> internal packages.
> 
> To me this feels pretty roundabout, and I suspect that there are much
> nicer solutions (suggestions welcome!). What I'm mostly curious about
> at the moment though is whether there's some nicer way to map files
> from the root filesystem back to packages, without having to maintain
> a separate database. Having the method be independent of the package
> format (e.g., IPK) would be a bonus, though I'm not sure if it's a
> strict requirement.

So, aside from the "internal package" concept, there are two ways to do this:

1) oe-pkgdata-util find-path - this will tell you the build-time package name 
that provided the specified path within the image (expects a full path, 
wildcards allowed). It also provides some other lookup tools. Note that this 
relies on pkgdata so it'll only work for a particular recipe after that recipe 
has been packaged.

2) Use the Toaster web UI - it allows you to browse through the image and 
click through from any file back to the package that contained it.

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre