Re: Cleanly moving files from one package to another


Bryan Evenson
 

Martin,

-----Original Message-----
From: Martin Jansa [mailto:martin.jansa@...]
Sent: Thursday, December 10, 2015 12:03 PM
To: Bryan Evenson <bevenson@...>
Cc: yocto@...
Subject: Re: [yocto] Cleanly moving files from one package to another

On Thu, Dec 10, 2015 at 04:20:45PM +0000, Bryan Evenson wrote:
Martin,

-----Original Message-----
From: Martin Jansa [mailto:martin.jansa@...]
Sent: Thursday, December 10, 2015 9:39 AM
To: Bryan Evenson <bevenson@...>
Cc: yocto@...
Subject: Re: [yocto] Cleanly moving files from one package to another

On Thu, Dec 10, 2015 at 02:15:05PM +0000, Bryan Evenson wrote:
Martin,

-----Original Message-----
From: Martin Jansa [mailto:martin.jansa@...]
Sent: Thursday, December 10, 2015 4:20 AM
To: Bryan Evenson <bevenson@...>
Cc: yocto@...
Subject: Re: [yocto] Cleanly moving files from one package to
another

On Wed, Dec 09, 2015 at 08:19:40PM +0000, Bryan Evenson wrote:
All,

I'm on poky/dizzy-1.7.3 and I'm using opkg for a package manager.
I have a
few script files that are part of one package that really belong with
another.
So I updated both recipes, removed the file from one recipe and
added it to the other recipe. I built everything, made the opkg
feed repo and tried to upgrade with "opkg update; opkg upgrade" to
see how clean the upgrade was. For each script file I moved from
one package to the other I get an error message of the form:

* check_data_file_clashes: Package A wants to install file
/path/to/script/file
But that file is already provided by package * B

I know I can do "opkg upgrade --force-overwrite", but I'd like to
make
recipe changes so that it upgrades cleanly. All I've done in the
recipes is remove the script files from the FILES variable and the
do_install step of one recipe and added the script to the FILES
variable and do_install step of the other recipe. I know
update-alternatives can be used if more than one package provides
the same binary, but is that necessary in this case when
transferring ownership to another package? Is there anything else I
can
do in the recipes to prevent the opkg install errors?

Have you tried to set
RREPLACES_<pkg-new> = "<pkg-old>"
?
I haven't tried that because I'm not replacing a package. Both packages
still
exist on the system and are both needed, it's just that ownership of one
of
the files is being transferred from one package to another. Would I still
use
RREPLACES even if I want to keep both packages on the system?

Specifically in this case, I have some script files for scheduled tasks that
were part of one of my self-made packages. However, they really belong
with cronie since this is what is calling the scripts. So I removed the script
files
from my self-made package and added them to cronie. My package has
other files still associated with it (that do belong with it) installed on my
system. So I want to keep both packages on my system, but I just want
to
change ownership of these script files from my package to cronie. Is
RREPLACES the tool for this job?

Is RREPLACES the tool for this job?
Yes, see
https://www.debian.org/doc/debian-policy/ch-relationships.html#s-
replaces

opkg should work the same.
Now I'm having something happen that I haven't seen before with the PR
service. I updated my .bbappend to add the RREPLACES as you suggested,
but bitbake didn't rebuild the package. I tried doing bitbake -c clean and
bitbake -c cleansstate and both times the built package had the same full
version number as it did before I made the RREPLACES change. I opened the
ipk with Archive Manager and looked at DEBIAN/control, and there was no
"Depends: " line in the control file. Then I noticed that this .bbappend had
"inherit pkgconfig" and it isn't needed in the .bbappend. So while I was at it I
deleted the line "inherit pkgconfig" and tried to build the package again
(without issuing a bitbake -c clean first). This time it built the package and the
PR service incremented the version. I opened the resulting ipk and looked at
DEBIAN/control again, and this time there was a "Depends:" line in the
control file.

Is changing RREPLACES not being seen as a metadata change by bitbake? Is
this a bug or is there something else I'm missing?

It should invalidate sstate signature for do_package* task
(maybe just do_package_write_ipk), if it doesn't then it's a bug.

Best way to test this is to use bitbake -S package, before and after
such change and bitbake-diffsigs on generated .sigdata files to see if
it was noticed by bitbake.
I did this test and the sstate signatures never changed no matter what I did to RREPLACES. I just filed a bug about the problem here: https://bugzilla.yoctoproject.org/show_bug.cgi?id=8788.

Regards,
Bryan


--
Martin 'JaMa' Jansa jabber: Martin.Jansa@...

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