iiab/roles/usb_lib/templates/mount.d/70-usb-library.j2

#!/bin/bash
# Create symlink in DocumentRoot/content to automounted usb drive
#
# based on a similar script in the xs-rsync package
# by Martin Langhoff <martin@laptop.org>
#
# and the adaptation for xs-activity-server by Douglas Bagnall
# <douglas@paradise.net.nz>
#
# by Tim Moody tim@timmoody.com

VERBOSE=yes

# UM_MOUNTPOINT and UM_DEVICE are documented at: https://github.com/rbrito/usbmount#hook-scripts

# 2022-06-16 better security thanks to @tim-moody and @jvonau:
# https://github.com/iiab/iiab/pull/3254
# 2022-06-16 better security thanks to @tim-moody and @jvonau:
# https://github.com/iiab/iiab/pull/3254
LIB_DEV=$(findmnt -no source /library | cut -d '[' -f 1)
ROOT_DEV=$(findmnt -no source /)
BOOT_DEV=$(findmnt -no source /boot)
BOOTFW_DEV=$(findmnt -no source /boot/firmware)
if [ "$UM_DEVICE" == "$LIB_DEV" ]; then
    logger -p user.notice -t "usb_lib (70-usb-library)" -- "Skipping $UM_MOUNTPOINT containing /library"
    exit
elif [ "$UM_DEVICE" == "$ROOT_DEV" ]; then
    logger -p user.notice -t "usb_lib (70-usb-library)" -- "Skipping $UM_MOUNTPOINT containing rootfs"
    exit
elif [ "$UM_DEVICE" == "$BOOT_DEV" ]; then
    logger -p user.notice -t "usb_lib (70-usb-library)" -- "Skipping $UM_MOUNTPOINT containing /boot"
    exit
elif [ "$UM_DEVICE" == "$BOOTFW_DEV" ]; then
    logger -p user.notice -t "usb_lib (70-usb-library)" -- "Skipping $UM_MOUNTPOINT containing /boot/firmware"
    exit
fi

if [ -d $UM_MOUNTPOINT/PUBLIC ]; then
    SHARE_DIR=$UM_MOUNTPOINT/PUBLIC
    logger -p user.notice -t "usb_lib (70-usb-library)" -- "Found /PUBLIC on $UM_MOUNTPOINT"
else
    SHARE_DIR=$UM_MOUNTPOINT
    logger -p user.notice -t "usb_lib (70-usb-library)" -- "Did not find /PUBLIC on $UM_MOUNTPOINT"
fi

CONTENT_LINK_USB=`basename $UM_MOUNTPOINT | awk '{print toupper($0)}'`
CONTENT_LINK="{{ doc_root }}/local_content/$CONTENT_LINK_USB"
logger -p user.notice -t "usb_lib (70-usb-library)" -- "Creating link from $SHARE_DIR to $CONTENT_LINK"
ln -s $SHARE_DIR $CONTENT_LINK