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

   1 #!/bin/bash
   2
   3 function cryptsetup_open {
   4     for DEVICE in /dev/disk/by-partlabel/ext*backup*; do
   5         if ! [ -L "$DEVICE" ]; then
   6             continue
   7         fi
   8         DISKNAME="$(basename "$DEVICE")"
   9         CRYPTNAME="crypt-$DISKNAME"
  10         echo "> cryptsetup luksOpen $DEVICE $CRYPTNAME"
  11         cryptsetup luksOpen "$DEVICE" "$CRYPTNAME" --key-file "/etc/lukskeys/${DISKNAME}"
  12         mkdir -p /run/ext-backup-crypt/
  13         ln -sf "/dev/mapper/$CRYPTNAME" /run/ext-backup-crypt/
  14     done
  15 }
  16
  17 function cryptsetup_close {
  18     for CRYPTDEVICE in /dev/mapper/crypt-ext*backup*; do
  19         if ! [ -L "$CRYPTDEVICE" ]; then
  20             continue
  21         fi
  22         CRYPTNAME="$(basename "$CRYPTDEVICE")"
  23         echo "> cryptsetup luksClose $CRYPTNAME"
  24         cryptsetup luksClose "$CRYPTNAME"
  25         rm -f "/run/ext-backup-crypt/$CRYPTNAME"
  26     done
  27 }
  28
  29 function pool_import {
  30     echo "> zpool import -d /run/ext-backup-crypt -a"
  31     zpool import -d /run/ext-backup-crypt -a
  32
  33     ZPOOLNAME="$(zpool list -H -o name|grep 'ext.*backup'|head -n1)"
  34     if [ -z "$ZPOOLNAME" ]; then
  35         echo "Error! Could not find pool!"
  36         return 1
  37     fi
  38
  39     echo "> Found: $ZPOOLNAME"
  40 }
  41
  42 function pool_export {
  43     echo "> zpool export $ZPOOLNAME"
  44     for _ in $(seq 60); do
  45         zpool export "$ZPOOLNAME" && break
  46         sleep 1
  47     done
  48 }
  49
  50 function pool_setup {
  51     zpool set failmode=continue "$ZPOOLNAME"
  52     zfs set mountpoint="/mnt/$ZPOOLNAME" "$ZPOOLNAME"
  53     chmod 0700 "/mnt/$ZPOOLNAME"
  54     zfs set compression=lz4 "$ZPOOLNAME"
  55     zfs set devices=off "$ZPOOLNAME"
  56     zfs set exec=off "$ZPOOLNAME"
  57     zfs set setuid=off "$ZPOOLNAME"
  58     zfs set xattr=sa "$ZPOOLNAME"
  59     zfs set acltype=posixacl "$ZPOOLNAME"
  60 }
  61
  62 function pool_maybe_scrub {
  63     local now
  64     local last_scrub
  65     local last_scrub_days_ago
  66     now="$(date +%s)"
  67     last_scrub="$(zpool status "$ZPOOLNAME"|sed -nE 's/scan: scrub repaired.* on (.*)/\1/p')"
  68     last_scrub_days_ago=$(((now - $(date --date="${last_scrub:-1970-01-01}" +%s)) / 86400))
  69
  70     if [ $last_scrub_days_ago -lt 7 ]; then
  71         return
  72     fi
  73
  74     echo "> zpool scrub $ZPOOLNAME"
  75     zpool scrub "$ZPOOLNAME"
  76
  77     while zpool status "$ZPOOLNAME" | grep -q "scrub in progress"; do
  78         echo -n .
  79         sleep 60
  80     done
  81     echo " done"
  82 }
  83
  84 function syncoidw {
  85     echo "> syncoid $1"
  86     syncoid "$@" --identifier "$ZPOOLNAME"
  87 }
  88
  89 function snapshot_cleanup {
  90     echo "> Cleaning snapshots"
  91     sanoid --configdir=/etc/sanoid/ext-backup --verbose --prune-snapshots
  92
  93     zfs list -t snapshot -H -o name -r "$ZPOOLNAME" \
  94         | grep -F @syncoid_ \
  95         | grep -Fv "@syncoid_$ZPOOLNAME" \
  96         | xargs -rn1 zfs destroy -v
  97 }
  98
  99 function main {
 100     zfs get all -s local -H > /root/zfs-props.txt
 101     cryptsetup_open
 102     pool_import
 103     pool_setup
 104     snapshot_sync
 105     snapshot_cleanup
 106     pool_maybe_scrub
 107     pool_export
 108     cryptsetup_close
 109 }