mount

#!/bin/bash

set -eu

TARGET="$HOME/di/ext"

is_mounted() {
  lsblk | grep $TARGET | grep -q lvm
}

info() {
  echo "[$(date +'%Y-%m-%d %H:%M:%S')] $*"
}

if is_mounted; then
  echo "Already mounted"
  exit 0
fi

# list devices
info "Listing devices:"
uuids=()
while read -r uuid _ _; do
  if ! [[ $uuid =~ ^\{?[A-F0-9a-f]{8}-[A-F0-9a-f]{4}-[A-F0-9a-f]{4}-[A-F0-9a-f]{4}-[A-F0-9a-f]{12}\}?$ ]]; then
    continue
  fi
  if ! sudo file -sL "/dev/disk/by-uuid/$uuid" | grep -q LUKS; then
    continue
  fi
  uuids+=("$uuid")
done< <(sudo lsblk -o UUID,NAME,TYPE | grep disk | grep -v nvme)

# Check if locked disk exists
has_one=0
for uuid in "${uuids[@]}"; do
  id=$(echo "$uuid" | awk -F'-' '{print $1}')
  if ! lsblk | grep "lv-$id"; then
    has_one=1
    break
  fi
done

info "Found ${#uuids[@]} LUKS devices. Unlocking.."
if [ $has_one -eq 1 ]; then
  # unlock disks

  read -rsp "Enter passphrase: " passwd; echo
  for uuid in "${uuids[@]}"; do
    id=$(echo "$uuid" | awk -F'-' '{print $1}')
    name=$(lsblk -o NAME,UUID | grep "$uuid" | awk '{print $1}')
    is_mounted=$(lsblk | grep "lv-$id" | wc -l)
    info "$name ($uuid) -> lv-$id (mounted: $is_mounted)"
    # FIXME: hacky way of unlocking disks in parallel.
    # LVM is automatically scanned and activated when 3/4 disks are unlocked,
    # so we need to unlock all disks at once before udev(?) activating LVM.
    # This behavior occurs only on WSL (not on pure Linux).
    echo "$passwd" | sudo cryptsetup luksOpen "/dev/disk/by-uuid/$uuid" "lv-$id" &
  done

  # wait for all disks to unlock
  wait
  sleep 3
fi

# mount disks
# Check if mounted
if ! is_mounted; then
  info "Mounting disks.."
  sudo mount /dev/mapper/vg--ext-lv--ext "$TARGET"
fi

info 'done'