installkernel without creating kernel.old

[FestusHagen]

How can one change the creation location of kernel.old or prevent it's creation when doing "make installkernel"??

Not enough disk space, and I have already created a backup elsewhere.

Thanks

-Enjoy
fh : )_~

[trev]

I'm guessing wildly, but perhaps 'make reinstallkernel' after a 'make buildkernel' would do what you want. Let us know :)

[mk]

didn't fully tested but you can try memory fs

mkdir /boot/kernel.old/
dd if=/dev/zero of=/usr/krn.old count=128 bs=1m
mdconfig -at vnode -f /usr/krn.old -u 33
newfs /dev/md33
mount /dev/md33 /boot/kernel.old
#after finish make installkernel unmount
#and then delete memdevice 33
mdconfig -du 33

[FestusHagen]

didn't fully tested but you can try memory fs

mkdir /boot/kernel.old/
dd if=/dev/zero of=/usr/krn.old count=128 bs=1m
mdconfig -at vnode -f /usr/krn.old -u 33
newfs /dev/md33
mount /dev/md33 /boot/kernel.old
#after finish make installkernel unmount
#and then delete memdevice 33
mdconfig -du 33


This doesn't work, It fails with:
rm: /boot/kernel.old: Device busy

Though trying it gave me some hints on where to look for the code that handles the backup, thus finding it in:
/usr/src/sys/conf/kern.post.mk
and thus was able to mod and accomplish the goal.

Thanks

-Enjoy
fh : )_~

[mk]

i test my idea and get too device busy message, but kernel install nice and boot/reboot with success 2 times.
how did you figure out which exact file to look since when i read your post try (not that hard) to see is any such option to point where to be moved kernel.old?

[FestusHagen]

i test my idea and get too device busy message, but kernel install nice and boot/reboot with success 2 times.
how did you figure out which exact file to look since when i read your post try (not that hard) to see is any such option to point where to be moved kernel.old?

There was no _option_, I just changed the relevant code in /usr/src/sys/conf/kern.post.mk to point to another location.

The lines with ".old" are the relevant code:


kernel-install:
@if [ ! -f ${KERNEL_KO} ] ; then \
echo "You must build a kernel first." ; \
exit 1 ; \
fi
.if exists(${DESTDIR}${KODIR})
-thiskernel=`sysctl -n kern.bootfile` ; \
if [ ! "`dirname "$$thiskernel"`" -ef ${DESTDIR}${KODIR} ] ; then \
chflags -R noschg ${DESTDIR}${KODIR} ; \
rm -rf ${DESTDIR}${KODIR} ; \
else \
if [ -d ${DESTDIR}${KODIR}.old ] ; then \
chflags -R noschg ${DESTDIR}${KODIR}.old ; \
rm -rf ${DESTDIR}${KODIR}.old ; \
fi ; \
mv ${DESTDIR}${KODIR} ${DESTDIR}${KODIR}.old ; \
sysctl kern.bootfile=${DESTDIR}${KODIR}.old/"`basename "$$thiskernel"`" ; \
fi
.endif


-Enjoy
fh : )_~