Best practice to debug a bbclass customization

Best practice to debug a bbclass customization

[Marco Cavallini]

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Hello,
I am experimenting bbclass customization creating a very trivial task called do_marco() to get a list of the recipes built during a bitbake call.
I need to run this task each time bitbake is taking a recipe into account, adding INHERIT += "mycustom" in local.conf.

The problem is that whenever I modify the task source and I run bitbake I have a lot of recipes rebuilt as result.
Is this expected or there is anything to set to avoid that?
What is the best practice to debug a bbclass customization?

# mycustom.bbclass
python do_marco () {
package = d.getVar('PN', True)
version = d.getVar('PV', True)
s = "$ \"{0}\",\"{1}\"\n".format(package,version)
with open("marco.txt", "a") as logFile:
logFile.write(s);
}
do_package[postfuncs] += "do_marco"

Thank you
--
Marco

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Re: [bitbake-devel] Best practice to debug a bbclass customization

[Konrad Weihmann]

Something like this does actually do the trick but isn't the most 
charming way (as it influences hashing a lot)

do_foo[vardepvalue] = "1"
do_foo() {
     bbwarn ${PN}
}
do_install[postfuncs] += "do_foo"

Now you can alter the "do_foo" function as much as you want for the 
hashing part "do_foo" will always remain "1"

On 06.05.20 18:47, Marco Cavallini wrote:
> Hello,
> I am experimenting bbclass customization creating a very trivial task 
> called do_marco() to get a list of the recipes built during a bitbake call.
> I need to run this task each time bitbake is taking a recipe into 
> account, adding INHERIT += "mycustom" in local.conf.
> 
> The problem is that whenever I modify the task source and I run bitbake 
> I have a lot of recipes rebuilt as result.
> Is this expected or there is anything to set to avoid that?
> What is the best practice to debug a bbclass customization?
> 
> # mycustom.bbclass
> python do_marco () {
>          package = d.getVar('PN', True)
>          version = d.getVar('PV', True)
>          s = "$ \"{0}\",\"{1}\"\n".format(package,version)
>          with open("marco.txt", "a") as logFile:
>                  logFile.write(s);
> }
> do_package[postfuncs] += "do_marco"
> 
> Thank you
> --
> Marco
> 
> 
>