Re: [gentoo-dev] [LAST CHANCE]: kernel + kernel module ebuild changes

[Peter Johanson]

On Thu, Mar 18, 2004 at 08:47:30AM +0900, Georgi Georgiev wrote:
> maillog: 16/03/2004-10:00:45(-0500): Peter Johanson types
> > 3) config-kernel - A new tool for manipulating a few things relating to
> > your kernel environment. It is purely meant to affect the way your
> > kernels live on your system, and NOT for generating kernels, etc.
> > Features include:
> >   - setting a prefix for kernel output (e.g. a new kernel
> >     2.6.4-mm1 will have it's output set to
> >     /var/tmp/kernel-output/2.6.4-mm1). Users can choose a new prefix, or
> >     disable using koutput using config-kernel.
>
> How exactly is this going to be implemented? Is the tool going to write to a
> config file or create a symlink /usr/src/linux-output for example? Don't forget

All variables that affect things are going into /etc/env.d/05kernel


> that the user would have to still be able to easily compile a kernel on their
> own using the methods they are used to, i.e. make config, make menuconfig, make

They *will*. Things will be mostly transparent to the user. When a new
kernel is installed, or if a user does "config-kernel --make-koutput
/usr/src/linux-2.6.4" the toplevel makefile is edited to add the line
KBUILD_OUTPUT=/var/tmp/kernel-output/$KV

By adding this variable, when someone does:
# make menuconfig 
in that source tree, all the output files end up wherever KBUILD_OUTPUT
points to. that's all it takes. You can run all the normal make commands
as normal, but things end up elsewhere. No nasty hacking. The below
stuff is unnessecary. 

When users want to override the output, *then* they can specify things
on the command line. A normal user wanting to build a kernel for some
Alpha box they have can do the following:
$ mkdir ~/kernel-output/2.6.4-alpha
$ cd /usr/src/linux-2.6.4
$ make ARCH=alpha O=~/kernel-output/2.6.4-alpha menuconfig
$ make ARCH=alpha O=~/kernel-output/2.6.4-alpha

And they've then built a kernel for an alpha (assuming they have the
toolchain in their PATH, etc, etc) against the sources they had no write
access to.

This make sense?

-pete



> all, etc. I've been using a similar system on some of my machines (some where I
> don't have nvidia cards), and I implemented it the following way:
>
> $ ls -F /usr/src/linux-build
> 2.6.3-x1/
> 2.6.4-x1/
> CVS/
> _makefile
>
> $ readlink /usr/src/linux-build/2.6.4-x1/makefile
> ../_makefile
>
> $ cat /usr/src/linux-build/_makefile # I am dropping some irrelevant lines
> ifeq (,$(VERSION))
> -include Makefile
> ifeq (,$(VERSION))
> version_item = $(shell perl -e '@a=("$(1)"=~m,(\d+)\.(\d+)\.(\d+)([-_].+)?(-[^-/]+?)$$,);print $$a[$(2)]')
> dummy := $(shell echo VERSION     = $(call version_item,$(shell basename $(CURDIR)),0) > Makefile)
> dummy := $(shell echo PATCHLEVEL  = $(call version_item,$(shell basename $(CURDIR)),1) >>Makefile)
> dummy := $(shell echo SUBLEVEL    = $(call version_item,$(shell basename $(CURDIR)),2) >>Makefile)
> dummy := $(shell echo EXTRAVERSION= $(call version_item,$(shell basename $(CURDIR)),3)$(call version_item,$(shell basename $(CURDIR)),4) >>Makefile)
> include Makefile
> endif
>
> SRCVER     = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(X_RCVERSION)
> SRCTREE    = $(SRC_PREFIX)/usr/src/linux-$(SRCVER)
> FLAGS     += -C $(SRCTREE) O=$(O) VERSION=$(VERSION) PATCHLEVEL=$(PATCHLEVEL) SUBLEVEL=$(SUBLEVEL) EXTRAVERSION=$(EXTRAVERSION)
>
> # this I need for some module-building
> ifdef SUBDIRS
> FLAGS += SUBDIRS=$(SUBDIRS)
> endif
>
> kernel_targets=menuconfig config oldconfig gconfig xconfig all modules bzImage modules_install
>
> $(kernel_targets):
>         $(MAKE) $(FLAGS) $@
>
> flags:
> 	@echo $(FLAGS)
>
> source-location:
>         @echo $(SRCTREE)
>
> build-location:
>         @echo $(O)
>
> # the ugliest target follows
> install:
>         sh $(SRCTREE)/arch/$(myARCH)/boot/install.sh $(FULLVER) $(FULLVER)/arch/$(myARCH)/boot/bzImage $(FULLVER)/System.map ""
>
> endif
>
> # vim:ft=make:
>
> $ make -C /usr/src/linux-build/2.6.4-x1/ flags
> make: Entering directory `/usr/src/linux-build/2.6.4-x1'
> -C /usr/src/linux-2.6.4 O=/usr/src/linux-build/2.6.4-x1 VERSION=2 PATCHLEVEL=6 SUBLEVEL=4 EXTRAVERSION=-x1
> make: Leaving directory `/usr/src/linux-build/2.6.4-x1'
>
> Comments?
>
> --
> /\   Georgi Georgiev   /\ BOFH Excuse #328: Fiber optics caused gas    /\
> \/    chutz@×××.net    \/ main leak                                    \/
> /\  [phone]   /\                                              /\



-- 
Peter Johanson
<latexer@g.o>

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