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g4s8
n00b
Joined: 15 Dec 2017
Posts: 16
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 Posted: Wed Jan 16, 2019 10:57 am Post subject: Order of kernel rebuild steps |
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I have a script to rebuild the kernel after updating or config changes.
It includes: kernel building, modules building, installing initramfs with lvm and luks, rebuilding external modules (e.g. nvidia drivers) and updating grub config.
Here is the script:
| Code: |
#!/bin/bash
set -x
set -e
cd linux
# mount boot if not mounded
mount | grep "/boot type vfat" > /dev/null || mount /boot
# build the kernel
make -j16
# install modules
make modules_install
# prepare modules (for @module-rebuild)
make modules_prepare
# rebuild external modules (nvidia, etc)
emerge --ask=n @module-rebuild
# install kernel
make install
# build initramfs
genkernel --lvm --luks --install initramfs
# make grub config
grub-mkconfig > /boot/grub/grub.cfg
# umount boot
umount /boot
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this script is working fine, but with one exception: I always need to call it twice, if I don't I'll get error on boot (failed to load initramfs), I think that some steps in script has wrong order, but I can't figure out what steps exactly. Oficial docs doesn't cover rebuilding with initramfs: https://wiki.gentoo.org/wiki/Kernel/Upgrade
What's wrong with my script? How to update it to fix?
Also asked same question here: https://unix.stackexchange.com/questions/494691/order-of-kernel-upgrade-commands-for-gentoo |
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Atha
Apprentice
Joined: 22 Sep 2004
Posts: 229
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| Posted: Wed Jan 16, 2019 4:44 pm Post subject: |
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Isn't genkernel supposed to build the kernel anyway? Maybe genkernel has some issues with generating just the initramfs for a kernel that has already been built and installed...
My routine is
| Code: | | genkernel --no-splash all && emerge @module-rebuild && grub-mkconfig -o /boot/grub/grub.cfg && umount /boot |
I don't mount /boot because I have it set in /etc/genkernel.conf:
| Code: | # Configuration file for genkernel
INSTALL="yes"
OLDCONFIG="no"
MENUCONFIG="no"
NCONFIG="no"
CLEAN="no"
MRPROPER="no"
MOUNTBOOT="yes"
SYMLINK="yes"
SAVE_CONFIG="no"
USECOLOR="yes"
CLEAR_CACHE_DIR="yes"
MAKEOPTS="-j16"
GK_SHARE="${GK_SHARE:-/usr/share/genkernel}"
CACHE_DIR="/var/cache/genkernel"
DISTDIR="/var/lib/genkernel/src"
LOGFILE="/var/log/genkernel.log"
LOGLEVEL=1
DEFAULT_KERNEL_SOURCE="/usr/src/linux" |
All I have to do is copy the .config from the previous kernel, run "make listnewconfig" to get an overview, then "make oldconfig" to set the new options, and go with my genkernel command routine I wrote above.
I have no problems so far. I'm sorry I cannot be of more help, but my guess is really that genkernel doesn't correctly build the initramfs for you... |
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Tony0945
Watchman
Joined: 25 Jul 2006
Posts: 5127
Location: Illinois, USA
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| Posted: Wed Jan 16, 2019 5:26 pm Post subject: |
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My build script, modify as required: | Code: | #!/bin/bash
#test if running on a bare VT
if [ "$TERM" = linux ]; then
TERM=xterm #so make munuconfig will display correctly
fi
cd /usr/src/linux
zcat /proc/config.gz >.config
#cp /boot/config-4.17.19-gentoo .config
#test for backporting nct6775.c
LONGVER=$(uname -r)
SHORTVER=$(echo -n $LONGVER | cut -f1,2 -d'.')
if [ $SHORTVER = 4.4 ] || [ $SHORTVER = 4.9 ]; then
cp /usr/src/new_nct6775.c drivers/hwmon/nct6775.c
fi
# At this point we should compare kernel versions and make oldconfig if the base version has updated
make oldconfig
make menuconfig
make -j5 || { echo "make -j5 failed"; exit 1; }
make -j5 modules_install || { echo "make modules_install failed"; exit 2; }
make -j5 install && echo "Don't forget to update boot loader menu"
# kver="$(eselect kernel list | awk '{gsub("linux-","") ; if ($3 ~ "*") print $2}')"
# i.e. kver contains 4.9.9-gentoo
#virtualbox modules
echo "Building Virtualbox modules"
emerge @module-rebuild
echo "Done" |
This depends on having the kernel config built into the kernel which is a good idea anyway.
The nct6775.c stuff is because I have a newer motherboard that wasn't supported by the old nct6775.c but was in newer kernels. That may have been backported now. If you don't have an MSI Tomahawk B350, just erase it.
The commented out second line is for use in the case when the config is not in the kernel. Modify it as appropriate and then select "config in kernel" in make menuconfig. |
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