repair.sh

#! /usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'

if [[ $(whoami) != 'root' ]]; then
    exit 1
fi

read -r -p 'Is this a Samba share? [Y/n] ' SMB
read -r -p 'Enter Time Machine Hostname: ' HOSTNAME
read -r -p 'Enter Share: ' SHARE
read -r -p 'Enter Username: ' USERNAME

TM_NAME=$(hostname -s | sed -e 's/-/ /g')
MOUNT=/Volumes/TimeMachine
SPARSEBUNDLE=$MOUNT/$TM_NAME.sparsebundle
PLIST=$SPARSEBUNDLE/com.apple.TimeMachine.MachineID.plist

echo ""
echo "Disabling Time Machine"
tmutil disable

echo "Mounting volume"
mkdir -p $MOUNT

if [[ "$SMB" =~ ^([nN][oO]|[nN])+$ ]]
then
    mount_afp -i "afp://$USERNAME@$HOSTNAME/$SHARE" "$MOUNT"
else
    mount_smbfs "smb://$USERNAME@$HOSTNAME/$SHARE" "$MOUNT"
fi

function cleanup {
    if [ ! -z ${DISK-} ]; then
        echo "Detaching disk image"
        hdiutil detach "$DISK"
    fi
    echo "Unmounting Share"
    umount "$MOUNT"
    echo "Re-Enabling Time Machine"
    tmutil enable
}

trap cleanup EXIT

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

echo "Attaching sparse bundle"
DISK=$(hdiutil attach -nomount -noverify -noautofsck "${SPARSEBUNDLE}" | grep Apple_HFS | cut -f 1 | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')
echo "$DISK"
read -r -p "Press enter to continue"

echo "Repairing volume"
diskutil repairvolume $DISK

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

exit 0