#!/bin/busybox ash
# Original author Robert Shingledecker  2004
# Changes by other authors over the years, see git
# Larger rewrite by Richard A. Rost  March 5, 2023

. /etc/init.d/tc-functions
useBusybox

PATH="/bin:/sbin:/usr/bin:/usr/sbin"
export PATH
umask 022

# Exit if script is already running
[ -e /proc/partitions ] || exit
if [ -e /var/run/rebuildfstab.pid ]; then
 if [ -e "/proc/$(cat /var/run/rebuildfstab.pid)" ]; then
  touch /var/run/rebuildfstab.rescan 2>/dev/null
  exit
 fi
 rm -f /var/run/rebuildfstab.pid
fi
echo "$$" >/var/run/rebuildfstab.pid


MyPID="$$"
TMP="/tmp/fstab.$MyPID.tmp"
ADDEDBY="# Added by TC"
DEVROOT="/dev"

# Read a list of CDROM/DVD Drives
CDROMS=""
CDROMSF=/etc/sysconfig/cdroms
[ -s "$CDROMSF" ] &&  CDROMS=`cat "$CDROMSF"`

NTFSDRIVER=""
checkntfs() {
    if [ -z "$NTFSDRIVER" ]; then
        if [ -f /usr/bin/ntfs-3g ] || [ -f /usr/local/bin/ntfs-3g ] || [ -f /bin/ntfs-3g ]; then
            NTFSDRIVER="ntfs-3g"
        else
            NTFSDRIVER="ntfs3"
        fi
    fi

    FSTYPE="$NTFSDRIVER"
    case "$FSTYPE" in
        ntfs3|ntfs-3g) OPTIONS="$OPTIONS",iocharset=utf8;  ;;
        ntfs) OPTIONS="$OPTIONS,ro,umask=000";  ;;
    esac
}

# Create base fstab file (previous rebuildfstab additions removed).
rm -f "$TMP"
Custom=""
while read -r Device Line
do
	case $Device$Line in
		*"$ADDEDBY"*) # Skip entries added by TC.
		continue
		;;

		"/dev/"*) # Save a list of custom entries.
		Custom="$Custom ${Device##*/}"
		printf "%-15s %s\n" "$Device" "$Line" >> "$TMP"
		;;

		"#"*) # Comments
		echo "$Device $Line" >> "$TMP"
		;;

		*) # Base entries, proc, sysfs, tmpfs, ...
		printf "%-15s %s\n" "$Device" "$Line" >> "$TMP"
		;;
	esac
done < /etc/fstab

# Loop through block devices
DevList=""
while read -r DEVMAJOR DEVMINOR BLOCKS DEVNAME
do
	#  name  and  ""  filter out header and blank lines.
	case $DEVNAME in
		*loop*|*ram*|name|"")
		continue
		;;
	esac

	# Custom mounts were already processed.
	case "$Custom" in
		*"$DEVNAME"*)
		continue
		;;
	esac

	MOUNTPOINT="/mnt/$DEVNAME"
	OPTIONS="noauto,users,exec"
	FSTYPE=""

	# Set removable devices to auto.
	case "$CDROMS" in *"$DEVROOT/$DEVNAME"*) FSTYPE="auto" ;; esac
	# Avoid probing floppy drives.
	[ $DEVMAJOR -eq 2 ] && FSTYPE="auto"

	if [ "$FSTYPE" == "auto" ]
	then
		printf "%-15s %-15s %-8s %-20s %-s\n" "$DEVROOT/$DEVNAME" "$MOUNTPOINT" "$FSTYPE" "$OPTIONS" "0 0 $ADDEDBY" >> "$TMP"
		mkdir -p "$MOUNTPOINT" 2>/dev/null >/dev/null
		continue
	fi

	# Remaining devices get collected here.
	DevList="$DevList $DEVROOT/$DEVNAME"
done < /proc/partitions

if [ -n "$DevList" ]; then
	blkid -s TYPE $DevList | tr -d ':"' | while read -r DEVNAME TYPE
	do
		MOUNTPOINT="/mnt/${DEVNAME##*/}"
		FSTYPE="${TYPE#*=}"
		OPTIONS="noauto,users,exec"

		# Skip these file system types.
		case "$FSTYPE" in linux_raid_member|LVM2_member|zfs_member) continue;  ;; esac

		case "$FSTYPE" in
			ntfs) checkntfs ;;
			vfat|msdos) OPTIONS="${OPTIONS},umask=000" ;;
			swap) OPTIONS="defaults"; MOUNTPOINT="none" ;;
		esac

		if [ "$MOUNTPOINT" != "none" ]; then
			mkdir -p "$MOUNTPOINT" 2>/dev/null >/dev/null
		fi

		# Add entry to new fstab file.
		printf "%-15s %-15s %-8s %-20s %-s\n" "$DEVNAME" "$MOUNTPOINT" "$FSTYPE" "$OPTIONS" "0 0 $ADDEDBY" >> "$TMP"
	done
fi

# Move new fstab file to its proper location.
mv -f "$TMP" /etc/fstab

# Clean up
rm -f /var/run/rebuildfstab.pid
sync

# If another copy tried to run while we were running, rescan.
if [ -e /var/run/rebuildfstab.rescan ]; then
  rm -f /var/run/rebuildfstab.rescan
  exec $0 "$@"
fi