#!/bin/bash
# Ensures the NAS CIFS mount and the MSP360 bind-mount are both live.
# MSP360's pre-flight check does `mountpoint <Path>` on the exact configured
# storage Path (/mnt/nas-backups/MSPBackups). Since that's a subdirectory of
# the real CIFS mount (/mnt/nas-backups), it never registers as a mountpoint
# on its own -- so we bind-mount it onto itself to make it one.
set -u
MOUNT=/mnt/nas-backups
SUBDIR="$MOUNT/MSPBackups"
LOG=/var/log/msp360-mount-ensure.log

log() { echo "$(date '+%F %T') $1" >> "$LOG"; }

if ! mountpoint -q "$MOUNT"; then
    log "CIFS mount down, remounting $MOUNT..."
    if mount "$MOUNT" 2>>"$LOG"; then
        log "CIFS remount OK"
        umount "$SUBDIR" 2>/dev/null || true
    else
        log "CIFS remount FAILED"
        exit 1
    fi
fi

if ! mountpoint -q "$SUBDIR"; then
    log "Bind mount down, rebinding $SUBDIR..."
    mkdir -p "$SUBDIR"
    if mount --bind "$SUBDIR" "$SUBDIR" 2>>"$LOG"; then
        log "Bind mount OK"
    else
        log "Bind mount FAILED"
        exit 1
    fi
fi

exit 0