live-iso-gnome/hooks/4-booster-setup.chroot

#!/bin/sh

# Create booster hook dirs
mkdir -p /usr/share/booster/hooks-early
mkdir -p /usr/share/booster/hooks-late

# Create Early hook
touch /usr/share/booster/hooks-early/pika_live.sh
tee /usr/share/booster/hooks-early/pika_live.sh <<'EOF'
#! /bin/sh

set -eS

cat /proc/cmdline | grep 'boot=live' || exit 0

### Config
MEDIUM_LABEL="PikaOS 4"
#TMPFS_SIZE="3G"

### Create mounting dirs
mkdir -p /mnt/medium /mnt/filesystem /mnt/overlay /booster.root

### Mount live medium
mount -o ro "$(findfs LABEL="$MEDIUM_LABEL" | head -n1)" /mnt/medium

### Load loop module if not already loaded
modprobe loop

### Create loop from squashfs

#losetup /dev/loop69 /mnt/medium/live/filesystem.squashfs
## Mount squashfs loop
#mount -o ro /dev/loop69 /mnt/filesystem
mount -o loop,ro /mnt/medium/live/filesystem.squashfs /mnt/filesystem

### Mount tmpfs on ram

#mount -t tmpfs -o size="$TMPFS_SIZE",mode=1777 overlay_tmpfs /mnt/overlay
mount -t tmpfs -o mode=1777 overlay_tmpfs /mnt/overlay

### Create overlay dirs
mkdir -p /mnt/overlay/upper /mnt/overlay/work

### Create merged overlay
mount -t overlay overlay -o lowerdir=/mnt/filesystem:/mnt/medium,upperdir=/mnt/overlay/upper,workdir=/mnt/overlay/work /booster.root

### mount kernel filesystems
mount -n -t devtmpfs devtmpfs /booster.root/dev
mount -n -t proc     proc     /booster.root/proc
mount -n -t sysfs    sysfs    /booster.root/sys
mount -n -t tmpfs    tmpfs    /booster.root/run


### Switch to new root
#switch_root "/booster.root/" "/booster.root/sbin/init"
EOF

chmod +x /usr/share/booster/hooks-early/pika_live.sh

touch /etc/booster.yaml
tee /etc/booster.yaml <<'EOF'
vconsole: true
extra_files: busybox
enable_lvm: true
modules_force_load: usbhid
universal: true
modules: loop,*
enable_hooks: true
enable_plymouth: true
EOF

update-initramfs -c -k all