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SubjectRe: How to compile on one machine and install on another?
On Tue, Jun 19, 2001 at 04:55:10PM -0400, Tom Diehl wrote:
> On Tue, 19 Jun 2001, Alan Cox wrote:
> > Other than making sure you configure it for the box it will eventually run
> > on - nope you have it all sorted. If you use modules you'll want to install
> > the modules on the target machine too
> What is the best way to install the modules? Is there a directory _all_ of
> the modules exist in b4 you do "make modules_install". I usually end up
> setting EXTRAVERSION to something unique and doing a make modules_install.
> That way it does not hose up the modules for the build machine.
> Is there a better way?

Change MODLIB in $(TOPDIR)/Makefile (e.g. /usr/src/linux/Makefile). I do this
to compile the kernel and modules without root priviledges at all. make
modules_install will fail at the end when trying to run 'depmod', but that's
okay - you can do that yourself:

(TOPDIR=${HOME}/linux, MODLIB=${HOME}/kernel/<revision>/modules)

make config dep clean bzImage modules && cp arch/i386/boot/bzImage \
${MODLIB}/../ && make modules_install || echo modules_install failed as expected
cd ${MODLIB}/../
mkdir -p lib/modules
ln -s ${PWD}/modules lib/modules/`uname -r`
depmod -F -C /dev/null -b $PWD -r -a

Note that Joe Average user can do all of this, root need not be involved at

Then fix up the resulting modules.dep with sed, I don't remember what depmod
gives you exactly so I can't type out the exact command.. then clean up:

rm lib/modules/`uname -r` ; rmdir lib/modules lib

Now you have a nice kernel package ready to go in $HOME/kernel. Don't forget
to copy $MODLIB into the right spot (rename the directory to the kernel's
revision) and chown -R root or modutils will pout, unless you are making a
romfs or such where the only user is root :-) nfs will work just fine without
security qualms since the kernel installation is non-root owned. (for
large-scale deployment, you probably can't beat having machines booting from
a server and fetching new romfs images each boot.)

btw, the abuse of depmod in this way isn't very nice, but afaics there is no
other way. I would personally like depmod to dump dependency information for
any valid module tree, expanding the definition of valid to include trees not
prefixed by /lib/modules/`uname -r`, but oh well, it gets by in the end as so
many other things do ;-)

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