Update Alpine, Arch, Fedora and RHEL root on ZFS guides

Signed-off-by: Maurice Zhou <jasper@apvc.uk>

docs/Getting Started/Arch Linux/Root on ZFS/2-system-installation.rst

@@ -10,13 +10,18 @@ System Installation
 
      for i in ${DISK}; do
 
+     # wipe flash-based storage device to improve
+     # performance.
+     # ALL DATA WILL BE LOST
+     # blkdiscard -f $i
+
      sgdisk --zap-all $i
 
      sgdisk -n1:1M:+1G -t1:EF00 $i
 
      sgdisk -n2:0:+4G -t2:BE00 $i
 
-     test -z $INST_PARTSIZE_SWAP || sgdisk -n4:0:+${INST_PARTSIZE_SWAP}G -t4:8200 $i
+     sgdisk -n4:0:+${INST_PARTSIZE_SWAP}G -t4:8200 $i
 
      if test -z $INST_PARTSIZE_RPOOL; then
          sgdisk -n3:0:0   -t3:BF00 $i
@@ -25,6 +30,12 @@ System Installation
      fi
 
      sgdisk -a1 -n5:24K:+1000K -t5:EF02 $i
+
+     sync && udevadm settle && sleep 3 
+
+     cryptsetup open --type plain --key-file /dev/random $i-part4 ${i##*/}-part4
+     mkswap /dev/mapper/${i##*/}-part4
+     swapon /dev/mapper/${i##*/}-part4 
      done
 
 #. Create boot pool::
@@ -84,9 +95,7 @@ System Installation
 
    If not using a multi-disk setup, remove ``mirror``.
 
-#. This section implements dataset layout as described in `overview <1-preparation.html>`__.
-
-   Create root system container:
+#. Create root system container:
 
    - Unencrypted::
 
@@ -108,18 +117,34 @@ System Installation
        -o keyformat=passphrase \
        rpool/archlinux
 
-   Create system datasets::
+   You can automate this step (insecure) with: ``echo POOLPASS | zfs create ...``.
 
-      zfs create -o canmount=on -o mountpoint=/     rpool/archlinux/root
-      zfs create -o canmount=on -o mountpoint=/home rpool/archlinux/home
-      zfs create -o canmount=off -o mountpoint=/var  rpool/archlinux/var
-      zfs create -o canmount=on  rpool/archlinux/var/lib
-      zfs create -o canmount=on  rpool/archlinux/var/log
+   Create system datasets, let Archlinux declaratively
+   manage mountpoints with ``mountpoint=legacy``::
 
-   Create boot dataset::
+      zfs create -o mountpoint=legacy     rpool/archlinux/root
+      mount -t zfs rpool/archlinux/root /mnt/
+      zfs create -o mountpoint=legacy rpool/archlinux/home
+      mkdir /mnt/home
+      mount -t zfs  rpool/archlinux/home /mnt/home
+      zfs create -o mountpoint=legacy  rpool/archlinux/var
+      zfs create -o mountpoint=legacy rpool/archlinux/var/lib
+      zfs create -o mountpoint=legacy rpool/archlinux/var/log
+      zfs create -o mountpoint=none bpool/archlinux
+      zfs create -o mountpoint=legacy bpool/archlinux/root
+      mkdir /mnt/boot
+      mount -t zfs bpool/archlinux/root /mnt/boot
+
+#. zfs-mkinitcpio requires root dataset to have a mountpoint
+   other than legacy::
+
+      umount -Rl /mnt
+      zfs set canmount=noauto  rpool/archlinux/root
+      zfs set mountpoint=/     rpool/archlinux/root
+      mount -t zfs -o zfsutil rpool/archlinux/root /mnt
+      mount -t zfs  rpool/archlinux/home /mnt/home
+      mount -t zfs bpool/archlinux/root /mnt/boot
 
-     zfs create -o canmount=off -o mountpoint=none bpool/archlinux
-     zfs create -o canmount=on -o mountpoint=/boot bpool/archlinux/root
 
 #. Format and mount ESP::
 
@@ -131,14 +156,3 @@ System Installation
 
     mkdir -p /mnt/boot/efi
     mount -t vfat $(echo $DISK | cut -f1 -d\ )-part1 /mnt/boot/efi
-
-#. Install packages::
-
-     pacstrap /mnt base vi mandoc grub efibootmgr mkinitcpio
-
-     CompatibleVer=$(pacman -Si zfs-linux | grep 'Depends On' | sed "s|.*linux=||" | awk '{ print $1 }')
-     pacstrap -U /mnt https://archive.archlinux.org/packages/l/linux/linux-${CompatibleVer}-x86_64.pkg.tar.zst
-
-     pacstrap /mnt zfs-linux zfs-utils
-
-     pacstrap /mnt linux-firmware intel-ucode amd-ucode