[OE-core] [PATCH 1/1] scripts/oe-depends-dot: add it to handle dot files

[Richard Purdie]

On Mon, 2018-01-15 at 18:34 +0800, Robert Yang wrote:
> Add it to handle recipe-depends.dot and task-depends.dot. E.g.:
> 
> * Print why rpm is built
>   $ oe-depends-dot -k rpm --why/-w recipe-depends.dot
>   Because: core-image-sato libdnf libsolv dnf
> 
> * Print bzip2-native's depends
>   $ oe-depends-dot -k bzip2-native --depends/-d recipe-depends.dot
>   Depends: automake-native gnu-config-native libtool-native quilt-
> native autoconf-native
> 
> * Remove duplicated dependencies to reduce the size of the dot files.
>   For example, A->B, B->C, A->C, then A->C can be removed. The dot
> files are too
>   big, we nearly couldn't use 'dot -T' to generate pictcures for
> target recipes,
>   remove the duplicated dependencies makes is it possible.
>   $ bitbake core-image-sato -g
>   $ oe-depends-dot -r recipe-depends.dot
>   Saving reduced dot file to recipe-depends-reduced.dot
>   $ du -sh recipe-depends*.dot
>   608K    recipe-depends.dot
>   32K     recipe-depends-reduced.dot
> 
>   It has been recuded from 608K to 32K, now we can generate a
> picture,
>   otherwise, it is too big:
>   $ dot -Tpng recipe-depends-reduced.dot -O
> 
> It also can handle task-depends.dot.

I just wanted to mention that whilst I've not tried using it due to
time constraints, I like the idea of this approach a lot, thanks
Robert!

Cheers,

Richard