Fix time machine backup

repair.sh

#!/usr/bin/env bash
# http://tonylawrence.com/post/unix/fixing-corrupted-time-machine-backups/

set -euf -o pipefail
set -x

if [[ $(whoami) != 'root' ]]; then
  echo "Please run as root" > /dev/stderr
  exit 1
fi

SPARSEBUNDLE=${1-"/Volumes/Airport Drive Backup/$(hostname -s).backupbundle"}

[ -e "${SPARSEBUNDLE}" ] || { echo "Can't find $SPARSEBUNDLE"; exit 1; }

PLIST="$SPARSEBUNDLE/com.apple.TimeMachine.MachineID.plist"

echo "Disabling Time Machine"
tmutil disable

echo "Changing file and folder flags"
chflags -R nouchg "$SPARSEBUNDLE"

echo "Attaching sparse bundle"
DISK="$(\
  hdiutil attach -nomount -readwrite -noverify -noautofsck "$SPARSEBUNDLE" |
  awk '/Apple_HFS/ { print $1 }'\
  )"

echo "Repairing volume"
diskutil unmountDisk "$DISK"

/sbin/fsck_hfs -drfy -c 2200 "$DISK"
# diskutil repairVolume "$DISK"

echo "Fixing Properties"
sed -i.bak \
  -e '/RecoveryBackupDeclinedDate/{N;d;}' \
  -e '/VerificationState/{n;s/2/0/;}' \
  "$PLIST"

echo "Unmounting volumes"
hdiutil detach "$DISK"

echo "Enabling Time Machine"
tmutil enable

echo "Starting backup"
tmutil startbackup