build latest zfs kernel module from source code on raspberrypi2 arm 32bit debian pios

build latest zfs kernel module from source code on raspberrypi2 arm 32bit debian pios.sh

## FOR AMD64 ubuntu try to find repo: https://launchpad.net/ubuntu/+ppas?name_filter=zfs  :
# export DEBIAN_FRONTEND=noninteractive
# sudo add-apt-repository -y ppa:arter97/zfs
# sudo apt purge -y dkms zfs-dkms zfs-zed zfsutils-linux || true
# sudo apt purge -y dkms libnvpair3linux libuutil3linux libzfs6linux libzpool6linux || true
# sudo apt install -y zfs-dkms zfsutils-linux
# sudo reboot

# for ARM, continue with:
sed -r -i'.BAK' 's/^deb(.*)$/deb\1 contrib/g' /etc/apt/sources.list

# MUST REMOVE zfs-dkms zfs-zed , so modules will not conflict:
sudo apt purge -y zfs-dkms zfs-zed zfsutils-linux 
sudo apt purge -y zfsutils-linux zfs-zed
sudo apt purge -y libzfs2linux || true
sudo apt autoremove -y
sudo apt update -y
sudo apt upgrade -y

echo "NOW REBOOT, to both: fully remove zfs-dkms&zfs-zed AND take eventually latest kernel, you are now $(uname -r)"
sleep 100
#reboot # to take latest uname -r

#sudo apt install linux-generic -y
apt depends linux-image-generic # THIS ALWAYS POINTS TO LATEST installed
apt list --installed | grep linux-image-$(uname -r) || sudo apt install linux-image-$(uname -r) -y # --reinstall
apt list --installed | grep linux-modules-$(uname -r) || sudo apt install linux-modules-$(uname -r) -y # --reinstall
apt list --installed | grep linux-modules-extra-$(uname -r) || sudo apt install linux-modules-extra-$(uname -r) -y # --reinstall

#sudo apt --autoremove --yes purge linux-generic linux-image-generic linux-headers-generic
apt list --installed | grep linux-headers || sudo apt install -y linux-headers 


sudo apt install libncurses5-dev libffi-dev libtool -y #suggested by gemini

#sudo apt install build-essential autoconf automake libtool gawk alien fakeroot dkms libblkid-dev uuid-dev libudev-dev libssl-dev zlib1g-dev libaio-dev libattr1-dev libelf-dev linux-headers-generic python3 python3-dev python3-setuptools python3-cffi libffi-dev python3-packaging git libcurl4-openssl-dev debhelper-compat dh-python po-debconf python3-all-dev python3-sphinx parallel
#
sudo apt install -y build-essential autoconf automake libtool gawk alien fakeroot dkms libblkid-dev uuid-dev libudev-dev libssl-dev zlib1g-dev libaio-dev libattr1-dev libelf-dev python3 python3-dev python3-setuptools python3-cffi libffi-dev python3-packaging git libcurl4-openssl-dev debhelper-compat dh-python po-debconf python3-all-dev  parallel

#python3-sphinx samba
sudo apt install -y ksh bc bzip2 fio acl sysstat mdadm lsscsi parted attr dbench nfs-kernel-server  rng-tools pax linux-perf selinux-utils quota

git clone --depth 1 --branch zfs-2.2.4 https://github.com/openzfs/zfs.git
#git checkout zfs-2.2.4
cd zfs
sh autogen.sh
./configure
make -s -j$(nproc)

## BEFORE INSTALL:

## OLD:
#lsmod | grep zfs
#zfs                  3411968  3
#zunicode              331776  1 zfs
#zavl                   16384  1 zfs
#icp                   253952  1 zfs
#zcommon                69632  1 zfs
#znvpair                77824  2 zfs,zcommon
#spl                   106496  4 zfs,icp,znvpair,zcommon

## BACKUP:
sudo cp -rPp /lib/modules/$(uname -r) /lib/modules/$(uname -r).original
sudo cp -rPp /usr/src/linux-headers-$(uname -r) /usr/src/linux-headers-$(uname -r).original

## disable and remove old:
sudo systemctl disable --now zfs-zed || true
sudo rmmod zfs zunicode zavl icp zcommon znvpair spl
sudo modprobe -rv zfs


### INSTALL
sudo make install; sudo ldconfig; sudo depmod

ls -la /lib/modules/$(uname -r)/extra/

##before make install, remove extra from search of: /etc/depmod.d/ubuntu.conf

## usually sudo depmod -a ; sudo modprobe zfs , so do:
cd scripts
sudo ./zfs.sh -vr
#instead of:
sudo modprobe zfs

## if install did not make new module automatically at reboot, do:
#add extra in search of: /etc/depmod.d/ubuntu.conf
#and sudo depmod -a ; sudo modprobe zfs

### https://openzfs.github.io/openzfs-docs/Developer%20Resources/Building%20ZFS.html#github-repositories
sudo make -C module/ install
sudo make -C modules/ install || true #???

echo "some kernel cleanup"
apt purge linux-headers-$(uname -r)-v6 linux-headers-$(uname -r)-v6* linux-image-$(uname -r)-v6* linux-headers-rpi-v6* linux-image-rpi-v6* -y
apt purge linux-headers-$(uname -r)-v8* linux-headers-$(uname -r)-v8* linux-image-$(uname -r)-v8* linux-headers-rpi-v8* linux-image-rpi-v8* -y
apt purge linux-headers-$(uname -r)-v7l* linux-headers-$(uname -r)-v7l* linux-image-$(uname -r)-v7l* linux-headers-rpi-v7l* linux-image-rpi-v7l* -y


sudo systemctl enable --now zfs-zed.service
sudo systemctl enable --now zfs-mount.service

cat <EOF
#list of systemd services:
zfs-import-cache.service
zfs-import-scan.service
zfs-mount.service
[email protected]
[email protected]
zfs-share.service
zfs-volume-wait.service
zfs-zed.service
EOF


### SYNC
for snap in $(zfs list -H -o name -t snapshot -r z4/z); do     holds=$(zfs holds -H $snap);     if [ -n "$holds" ]; then echo $holds; fi; done

for snap in $(zfs list -H -o name -t snapshot -r z8/z); do     holds=$(zfs holds -H $snap);     if [ -n "$holds" ]; then echo $holds; sudo zfs release syncoid_d01 $snap; fi; done