Re: [poky] Warning: empty_var_volatile doesn't exist

["Peter Kjellerstedt" <peter.kjellerstedt@axis.com>]

> -----Original Message-----
> From: poky@lists.yoctoproject.org <poky@lists.yoctoproject.org> On Behalf
> Of Steve
> Sent: den 27 oktober 2021 11:10
> To: poky@lists.yoctoproject.org
> Subject: Re: [poky] Warning: empty_var_volatile doesn't exist
> 
> Thanks Peter,
> >> -----Original Message-----
> >> From: poky@lists.yoctoproject.org <poky@lists.yoctoproject.org> On
> Behalf
> >> Of Steve
> >> Sent: den 27 oktober 2021 10:42
> >> To: poky@lists.yoctoproject.org
> >> Subject: [poky] Warning: empty_var_volatile doesn't exist
> >>
> >> Hello,
> >>
> >> I would like to remove /etc/timestamp from my rootfs.
> >> I found it is set by "rootfs_update_timestamp" as part of
> >> ROOTFS_POSTPROCESS_COMMAND.
> >>
> >> I did in my image recipe the following:
> >> ROOTFS_POSTPROCESS_COMMAND_remove = "rootfs_update_timestamp ; "
> >
> > That should be:
> >
> > ROOTFS_POSTPROCESS_COMMAND_remove = "rootfs_update_timestamp;"
> >
> > The _remove operator will remove each word specified from the original
> > variable. So in your case it would remove all "rootfs_update_timestamp"
> > and all ";", which is not what you want.
> 
> 
> It isn't as easy as in original is like (watch the blanks)
> " ... ; rootfs_update_timestamp ; >next..."
> 
> So if I do:
> ROOTFS_POSTPROCESS_COMMAND_remove = "rootfs_update_timestamp;"
> it is not removed
> and if I do
> ROOTFS_POSTPROCESS_COMMAND_remove = "rootfs_update_timestamp"
> I got errors because of "; ;"
> 
> So my guess is, the original recipe with this blanks is not correct.

It was corrected in 3.2.

> But how to workaround?

I believe it should work to do:

ROOTFS_POSTPROCESS_COMMAND_remove = "rootfs_update_timestamp"

That will leave "... ; ; ..." in ROOTFS_POSTPROCESS_COMMAND, but I think 
that should be ok.

> >> That seems to work, no /etc/timestamp in image.
> >> But I get the warning from do_rootfs:
> >> "Function write_image_test_data  empty_var_volatile doesn't exist"
> >>
> >> Did I do something wrong? I am not feeling well to ignore warnings,
> >> especially as I am a beginner here.
> >>
> >> Maybe allow me a second question:
> >> I need a part of utils-linux, but won't include all the files (due to
> >> space limitations).
> >> I guess I need some utils-linux_%.bbappend - but what has to be in
> >> there?
> >>
> >> Thanks, Arno (in Yocto 3.0 atm)
> >
> > //Peter
> 
> Best regards,  Arno

//Peter