Hooks for unmounting external USB on Arch

closeboot.md

Hooks for unmounting external USB on Arch

Files

• install_closeboot is the install hook
• runtime_closeboot is the runtime hook

Instructions

1. Copy install_closeboot to /usr/lib/initcpio/install/closeboot
2. Copy runtime_closeboot to /usr/lib/initcpio/hooks/closeboot
3. Modify /usr/lib/initcpio/hooks/closeboot appropriately, namely by replacing /dev/PATH_DUMMY with whatever device path the device would be residing at, ideally use a UUID path. Use ls -l /dev/disk/by-uuid/ to find the appropriate path indexed by UUID for your external device.
4. Add closeboot to list of hooks at /etc/mkinitcpio.conf after encrypt hook, e.g. HOOKS="base udev autodetect modconf block encrypt closeboot filesystems keyboard fsck"
5. Regnerate kernel images via mkinitcpio -p linux with boot partitions mounted

install_closeboot

#!/bin/ash

build() {
    add_runscript
}

help() {
    cat <<HELPEOF
This hook is a custom hook installed for external USB device after being opened by the encrypt hook.
HELPEOF
}

runtime_closeboot

#!/usr/bin/ash

run_hook() {
    if [ -b /dev/PATH_DUMMY ]; then
        cryptsetup close /dev/PATH_DUMMY >/dev/null
    fi
}