#!/bin/bash
set -e

echo ">>> [snapper-setup] Running INSIDE target system"

if [ "$(findmnt -no FSTYPE /)" != "btrfs" ]; then
  echo ">>> [snapper-setup] Root is not btrfs, skipping."
  exit 0
fi

if ! command -v snapper >/dev/null 2>&1; then
  echo ">>> [snapper-setup] snapper is not installed, skipping."
  exit 0
fi

if ! findmnt -no SOURCE /.snapshots >/dev/null 2>&1; then
  echo ">>> [snapper-setup] /.snapshots is not mounted, skipping."
  exit 0
fi

SABLON=/usr/share/snapper/config-templates/default
[ -f "$SABLON" ] || { echo ">>> [snapper-setup] Missing template $SABLON"; exit 1; }

install -d -m 755 /etc/snapper/configs
sed -e 's/^SUBVOLUME=.*/SUBVOLUME="\/"/' \
    -e 's/^FSTYPE=.*/FSTYPE="btrfs"/' \
    -e 's/^ALLOW_GROUPS=.*/ALLOW_GROUPS="wheel"/' \
    -e 's/^SYNC_ACL=.*/SYNC_ACL="yes"/' \
    -e 's/^NUMBER_CLEANUP=.*/NUMBER_CLEANUP="yes"/' \
    -e 's/^NUMBER_LIMIT=.*/NUMBER_LIMIT="10"/' \
    -e 's/^NUMBER_LIMIT_IMPORTANT=.*/NUMBER_LIMIT_IMPORTANT="5"/' \
    -e 's/^TIMELINE_CREATE=.*/TIMELINE_CREATE="no"/' \
    -e 's/^TIMELINE_CLEANUP=.*/TIMELINE_CLEANUP="yes"/' \
    -e 's/^EMPTY_PRE_POST_CLEANUP=.*/EMPTY_PRE_POST_CLEANUP="yes"/' \
    "$SABLON" > /etc/snapper/configs/root
chmod 640 /etc/snapper/configs/root

if [ -f /etc/conf.d/snapper ]; then
  sed -i 's/^SNAPPER_CONFIGS=.*/SNAPPER_CONFIGS="root"/' /etc/conf.d/snapper
else
  install -d /etc/conf.d
  echo 'SNAPPER_CONFIGS="root"' > /etc/conf.d/snapper
fi

chmod 750 /.snapshots
chown root:wheel /.snapshots

systemctl enable snapper-cleanup.timer
systemctl disable snapper-timeline.timer 2>/dev/null || true

snapper --no-dbus -c root create --type single --cleanup-algorithm number \
  --userdata important=yes --description "Telepítés utáni állapot"

echo ">>> [snapper-setup] Done."
snapper --no-dbus -c root list