code.delx.au - monosys/blob - lib-ext-backup

   1 #!/bin/bash
   2
   3 function find_device {
   4     for DEVICE in /dev/disk/by-partlabel/ext*backup*; do
   5         if [ -L "$DEVICE" ]; then
   6             ZPOOLNAME="$(basename "$DEVICE")"
   7             CRYPTNAME="crypt-$(basename "$DEVICE")"
   8             echo "> Found: $ZPOOLNAME -> $(readlink -e "$DEVICE")"
   9             return
  10         fi
  11     done
  12
  13     echo "ERROR! Couldn't find a backup device"
  14     exit 1
  15 }
  16
  17 function pool_import {
  18     if ! zpool status "$ZPOOLNAME" &> /dev/null; then
  19         echo "> cryptsetup luksOpen $DEVICE $CRYPTNAME"
  20         cryptsetup luksOpen "$DEVICE" "$CRYPTNAME" --key-file "/etc/lukskeys/${ZPOOLNAME}"
  21         echo "> zpool import $ZPOOLNAME"
  22         zpool import "$ZPOOLNAME"
  23     fi
  24 }
  25
  26 function pool_export {
  27     echo "> zpool export $ZPOOLNAME"
  28     for i in $(seq 10); do
  29         zpool export "$ZPOOLNAME" && break
  30     done
  31     echo "> cryptsetup luksClose $CRYPTNAME"
  32     cryptsetup luksClose "$CRYPTNAME"
  33 }
  34
  35 function cleanup_snapshots {
  36     echo "> Cleaning snapshots"
  37
  38     sanoid --configdir=/etc/sanoid/ext-backup --verbose --prune-snapshots
  39
  40     zfs list -t snapshot -r "$ZPOOLNAME" -H -o name \
  41         | grep -F @syncoid_ \
  42         | grep -Fv "@syncoid_$ZPOOLNAME" \
  43         | xargs -rn1 zfs destroy -v
  44 }
  45
  46 function syncoidw {
  47     syncoid --identifier "$ZPOOLNAME" "$@"
  48 }
  49
  50 function main {
  51     find_device
  52     pool_import
  53     sync_snapshots
  54     cleanup_snapshots
  55     pool_export
  56 }