1. inherit fs-uuid in some-recipe
2. set ROOTFS to some-existing-rootfs
3. make call to get_rootfs_uuid somewhere in that recipe ie.
"${@get_rootfs_uuid(d)}"
3. bitbake some-recipe

Pawel

On Fri, 6 Jan 2023 at 12:43, Alexander Kanavin <[email protected]> wrote:
>
> Can you please describe steps to reproduce?
>
> Alex
>
> On Fri 6. Jan 2023 at 13.40, Pawel Zalewski <[email protected]> 
> wrote:
>>
>> It is not actually being used by default in Yocto ?
>> This was found in kirkstone.
>> But regardless, it is wrong and will drop an error.
>>
>> Kind regards,
>> Pawel
>>
>> On Fri, 6 Jan 2023 at 12:06, Richard Purdie
>> <[email protected]> wrote:
>> >
>> > On Thu, 2022-12-22 at 10:38 +0000, Pawel Zalewski wrote:
>> > > The default return value from subprocess.check_output is an encoded byte.
>> > > The applied fix will decode the value to a string.
>> > >
>> > > Signed-off-by: Pawel Zalewski <[email protected]>
>> > > ---
>> > >  meta/classes/fs-uuid.bbclass | 2 +-
>> > >  1 file changed, 1 insertion(+), 1 deletion(-)
>> > >
>> > > diff --git a/meta/classes/fs-uuid.bbclass b/meta/classes/fs-uuid.bbclass
>> > > index 9b53dfba7a..731ea575bd 100644
>> > > --- a/meta/classes/fs-uuid.bbclass
>> > > +++ b/meta/classes/fs-uuid.bbclass
>> > > @@ -4,7 +4,7 @@
>> > >  def get_rootfs_uuid(d):
>> > >      import subprocess
>> > >      rootfs = d.getVar('ROOTFS')
>> > > -    output = subprocess.check_output(['tune2fs', '-l', rootfs])
>> > > +    output = subprocess.check_output(['tune2fs', '-l', rootfs], 
>> > > text=True)
>> > >      for line in output.split('\n'):
>> > >          if line.startswith('Filesystem UUID:'):
>> > >              uuid = line.split()[-1]
>> >
>> >
>> > That looks reasonable, I just wonder how this has worked until now? Why
>> > aren't we seeing errors due to this?
>> >
>> > Does it mean we don't have some test coverage? or was there silent
>> > breakage of some kind this fixes?
>> >
>> > Cheers,
>> >
>> > Richard
>>
>> 
>>
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