#!/bin/sh

# cobbled up [sic], but works for me

rsync_nocopy="--links --hard-links"
bk="nice -n 19 my_rsync ${rsync_nocopy} --preallocate --exclude=private*/"

tr_dir=/files/travmaturg
tr_dir_big=/big_files/travmaturg
usb_dir=/mnt/backup


# func dir

# mk_snapshot filters src dst
mk_snapshot () {
  mkdir -p "${bk_dir}"/current/"$3"
  ${bk} $1 --link-dest="${bk_dir}"/partial/"$3" --link-dest="${bk_dir}"/latest/"$3" "$2"/ "${bk_dir}"/current/"$3" || exit 1
  sync --file-system "${bk_dir}"
  }

# mk_copy filters src dst
mk_copy () {
  mkdir -p "${bk_dir}"/"$3"
  ${bk} --delete-before --delete-excluded $1 "$2"/ "${bk_dir}"/"$3" || exit 1
  sync --file-system "${bk_dir}"
  }


# func part

set_bk_dir () {
  mkdir -p "$1" || exit 1
  bk_dir="$1"
  }

bk_part_start () {
  set_bk_dir "$1"
  rm -rf "${bk_dir}"/partial
  mv -f "${bk_dir}"/current "${bk_dir}"/partial > /dev/null 2>&1
  }

bk_part_end () {
  rm -rf "${bk_dir}"/partial
  bk_new=$(date +%Y/%m/%d/%T)
  mkdir -p "${bk_dir}"/"${bk_new}"
  mv -T "${bk_dir}"/current "${bk_dir}"/"${bk_new}"
  ln -f -s -T "${bk_new}" "${bk_dir}"/latest
  }


# func disk

rnd_fn="random numbers because I can"
rnd () { dd if=/dev/urandom of="$1/${rnd_fn}" bs=1024000 count=1 > /dev/null 2>&1; }

try_mnt () {
  umount "${usb_dir}" > /dev/null 2>&1
  mount -U "$1" > /dev/null 2>&1
  }

bk_disk_end () { cd /; rnd "$1"; df -h -t ext4; }


# filters personal

my_filter="--exclude=out/ --exclude=*.swp"

conf="--exclude=/.config"
hf_config="${conf}/audacious/ ${conf}/dconf/ ${conf}/geeqie/ ${conf}/gsmartcontrol/ ${conf}/gtk-*/ ${conf}/libreoffice/ ${conf}/pulse/ ${conf}/vlc/ ${conf}/xfce*/"
hf_ext="--exclude=*.bak* --exclude=*.db"
hf_tmp="--exclude=*[cC]ache*/ --exclude=/.dbus/ --exclude=/.texlive*/ --exclude=*thumbnails/ --exclude=/*[._]tmp"
hf_dir="--exclude=/.bsfilter/ --exclude=/.gnupg/ --exclude=/.gstreamer-*/ --exclude=/.gconf/ --exclude=/.gimp*/ --exclude=/.kde/ --exclude=/.local/ --exclude=/.scorched3d/"
hf_other="--exclude=/.freeciv* --exclude=*[.-]log --exclude=/*session* --exclude=/.Xauthority"
home_filter="${hf_config} ${hf_ext} ${hf_tmp} ${hf_dir} ${hf_other}"

# filters downloadable

rs_filter="--exclude=*.png --exclude=*.tiff"

flash_pub_filter="--exclude=/iso/"


# backup levels
lvl_local=1
lvl_flash=2
lvl_ext_1=3
lvl_ext_2=4
lvl_das=5

# process level dst
process () {
  bk_part_start "$2"/personal
  mk_snapshot "${my_filter}" "${tr_dir}"/my my
  mk_snapshot "${home_filter}" /home/misha home
  if [ "$1" -ge "${lvl_flash}" ]; then mk_snapshot "" "${tr_dir_big}"/семейное семейное; fi
  if [ "$1" -ge "${lvl_ext_1}" ] || [ "$1" -eq "${lvl_local}" ]; then mk_snapshot "" "${tr_dir}"/work work; fi
  bk_part_end


  bk_part_start "$2"/downloadable

  if [ "$1" -ge "${lvl_ext_1}" ] || [ "$1" -eq "${lvl_local}" ]; then mk_snapshot "" "${tr_dir}"/archive archive; fi

  if [ "$1" -ge "${lvl_ext_1}" ]; then mk_snapshot "" "${tr_dir_big}"/archive_big archive_big; fi

  mk_snapshot "${rs_filter}" "${tr_dir}"/raw_samples raw_samples

  if [ "$1" -ge "${lvl_ext_1}" ] || [ "$1" -eq "${lvl_local}" ]; then mk_snapshot "" "${tr_dir}"/public public; fi
  if [ "$1" -eq "${lvl_flash}" ]; then mk_snapshot "${flash_pub_filter}" "${tr_dir}"/public public; fi

  if [ "$1" -ge "${lvl_das}" ]; then mk_snapshot "" "${tr_dir_big}"/public_extra public_extra; fi

  bk_part_end


  if [ "$1" -ge "${lvl_ext_1}" ]; then
    set_bk_dir "$2"/other
    if [ "$1" -ge "${lvl_ext_2}" ]; then mk_copy "" "${tr_dir_big}"/porn porn; fi
    mk_copy "" "${tr_dir_big}"/unsorted unsorted
  fi

  bk_disk_end "$2"
  }

rnd "${tr_dir}"
rnd "${tr_dir_big}"
sync


# flash

corsair_survivor_stealth_128_gb="087eb000-52fb-4748-8376-f15c95af7bd9"

if
  try_mnt "${corsair_survivor_stealth_128_gb}" || \
  false
then
  process "${lvl_flash}" "${usb_dir}"/travmaturg_backup
  umount "${usb_dir}"
  exit 0
fi


# external 1

wd_red_1_tb="461996db-0a81-4d7e-98dc-334a6c3857c1"

if
  try_mnt "${wd_red_1_tb}" || \
  false
then
  process "${lvl_ext_1}" "${usb_dir}"/travmaturg_backup
  umount "${usb_dir}"
  exit 0
fi


# external 2

wd_my_passport_ultra_3_tb_blue="a15c91ba-73de-4e11-86b0-8968360a2d18"

if
  #try_mnt "${wd_my_passport_ultra_3_tb_blue}" || \
  false
then
  process "${lvl_ext_2}" "${usb_dir}"/travmaturg_backup
  umount "${usb_dir}"
  exit 0
fi


# DAS

seagate_ironwolf_6_tb="6f119c3f-6f27-4770-a74d-e272ed13ed4a"
toshiba_mg_6_tb="f39dc3e6-6176-4877-8959-0d9ae8060b18"
toshiba_n300_6_tb="a23c6653-062e-4461-a692-3e17863ebf28"
toshiba_x300_8_tb="951c1617-4b02-4ac6-9d64-99506b1cb36e"

if
  #try_mnt "${seagate_ironwolf_6_tb}" || \
  try_mnt "${toshiba_mg_6_tb}" || \
  try_mnt "${toshiba_n300_6_tb}" || \
  try_mnt "${toshiba_x300_8_tb}" || \
  false
then
  process "${lvl_das}" "${usb_dir}"/travmaturg_backup
  umount "${usb_dir}"
  exit 0
fi


# local

if
  true
then
  process "${lvl_local}" /big_files/travmaturg_backup
  exit 0
fi