[oe-issues] [Bug 1719] New: RFC: Replace FILES_kernel-image = "" hacks with rootfs postprocessing command to remove zImage

[bugzilla-daemon at tinman.treke.net]

http://bugs.openembedded.org/show_bug.cgi?id=1719

           Summary: RFC: Replace FILES_kernel-image = "" hacks with rootfs
                    postprocessing command to remove zImage
           Product: Openembedded
           Version: Angstrom
          Platform: ARM
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Distributions
        AssignedTo: openembedded-issues at lists.openembedded.org
        ReportedBy: pmiscml at gmail.com
         QAContact: tinderbox-oe at gmx.net


See
http://lists.linuxtogo.org/pipermail/angstrom-distro-devel/2006-December/000058.html
for detailed discussion. Summary:

Some machines use following construct:

FILES_kernel-image = ""

to get a rootfs image without /boot/zImage (on the basis that they use other
means to store kernel image, like separate MTD partition).

Such usage considered a hack on packaging system, which leads to various
misfeatures (and teh main being that kernel itself is made to escape package
management).

So instead, another solution is proposed - if we need to have ability to remove
zImage from rootfs, let's do just that - use ROOTFS_POSTPROCESS_COMMAND to run
a postprocessing function which will remove /boot/zImage*.

In this way, there will still be support for management of kernel images using
ipkg. Of course, users of adhoc bootloader will need to perform extra (manual?)
operations to actually use upgraded kernel, but: 1) we could automate that
(per-machine overridable); 2) the general direction hopefully would be adopting
general bootloading solution like LAB/altboot.

Attach is the patch to implement postprocessing command.


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