[oe] get OE git hash tag in executable

[Khem Raj]

On Sat, Jan 28, 2012 at 6:18 AM, Paul Eggleton
<paul.eggleton at linux.intel.com> wrote:
> On Saturday 28 January 2012 13:42:32 Frans Meulenbroeks wrote:
>> In order to allow backtracking of the sources for a binary build with OE, I
>> would like to (automatically) add the hash of the top level commit (and
>> maybe also the branch) of the oe git tree my recipe lives in).
>> E.g. in main.c I would like to have a var say:
>> const char * const buildfrom = "oe branch 2011.03-maintence hash
>> 1234567890"; or something like that.
>>
>> What would be the best way to get that info into my program?
>> (my best guess at the moment is to use a macro and compile with
>> -DOE_IDENT="....." or so and say  char *buildfrom = OE_IDENT; but not
>> really sure what the best way is to fill OE_IDENT and pass it to the
>> recipe.)
>
> Interesting question! Putting the information in a define specified on the
> compiler command line would be one way; another way would be to have the
> recipe write to/append to/subsitute into a header file that you can #include in
> the source. You would also probably want to include ${DATE} in the recipe's PV
> or use some other mechanism to ensure it gets rebuilt every time you build an
> image.

use python-fu to grok it from metadata dump this into a .h file during
do_configure and movie that headerfile into the sources then
include it in your .c and use it.

>
> I guess you are still using OE-Classic, but in OE-Core we now have a function
> in base.bbclass called get_layers_branch_rev that will return the git
> branch/revision information for all enabled layers. It was split out from the
> code in the same bbclass that displays this information when BitBake starts,
> so I guess you could just make a copy of it into your recipe for OE-Classic.
>
> Cheers,
> Paul
>
> --
>
> Paul Eggleton
> Intel Open Source Technology Centre
>
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