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#!/system/bin/sh
# magisk-fstab - Systemless fstab tool for magisk
# Copyright (C) 2025 Leonard Kugis <leonard@kug.is>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
# Do NOT assume where your module will be located.
# ALWAYS use $MODDIR if you need to know where this script and module is placed.
# This will make sure your module will still work if Magisk changes its mount point in the future
MODDIR=${0%/*}
export LOG_FILE="${MODDIR}/magisk-fstab.log"
LOG_MAX_LINES=1000
BOOTWAIT_MAX_COUNT=20
BOOTWAIT_COUNT_INTERVAL=15
CONF_MAIN="${MODDIR}/config/main.conf"
CONF_FSTAB="${MODDIR}/config/fstab.conf"
# --- single-run lock (prevents concurrent starts) ---------------------------
LOCKDIR="${MODDIR}/.runlock"
PIDFILE="${LOCKDIR}/pid"
acquire_lock() {
# Versuche Lock-Verzeichnis atomar anzulegen
if mkdir "${LOCKDIR}" 2>/dev/null; then
# Lock bekommen
echo "$$" > "${PIDFILE}"
# Bei Exit Lock säubern
trap 'rc=$?; rm -f "${PIDFILE}"; rmdir "${LOCKDIR}" 2>/dev/null; exit $rc' INT TERM EXIT
return 0
fi
# Lock existiert -> prüfen, ob stale
if [ -f "${PIDFILE}" ]; then
oldpid="$(cat "${PIDFILE}" 2>/dev/null)"
if [ -n "${oldpid}" ] && [ -d "/proc/${oldpid}" ]; then
# Anderer Prozess läuft noch -> sauber beenden
echo "Another instance already running (pid ${oldpid}). Exiting." >>"${LOG_FILE}" 2>&1
return 1
fi
fi
# Stale Lock entfernen und erneut versuchen
echo "Stale lock detected, cleaning up..." >>"${LOG_FILE}" 2>&1
rm -f "${PIDFILE}" 2>/dev/null
rmdir "${LOCKDIR}" 2>/dev/null
if mkdir "${LOCKDIR}" 2>/dev/null; then
echo "$$" > "${PIDFILE}"
trap 'rc=$?; rm -f "${PIDFILE}"; rmdir "${LOCKDIR}" 2>/dev/null; exit $rc' INT TERM EXIT
return 0
else
echo "Failed to acquire lock after cleanup. Exiting." >>"${LOG_FILE}" 2>&1
return 1
fi
}
# Lock holen; wenn nicht möglich, still beenden
acquire_lock || exit 0
# ---------------------------------------------------------------------------
# Check if configs are readable
if [ ! -r "$CONF_MAIN" ]; then
echo "File '$CONF_MAIN' not readable." >>"${LOG_FILE}" 2>&1
exit 2
fi
if [ ! -r "$CONF_FSTAB" ]; then
echo "File '$CONF_FSTAB' not readable." >>"${LOG_FILE}" 2>&1
exit 2
fi
# Read main config
. "${CONF_MAIN}" >>"${LOG_FILE}" 2>&1
# wait for system boot to complete
bootwait_count=0
while [ "$(getprop sys.boot_completed)" != "1" ] && [ ${bootwait_count} -lt ${BOOTWAIT_MAX_COUNT} ]; do
sleep ${BOOTWAIT_COUNT_INTERVAL}
bootwait_count=$((bootwait_count + 1))
done
if [ ${bootwait_count} -ge ${BOOTWAIT_MAX_COUNT} ]; then
echo "Boot wait timeout" >>"${LOG_FILE}" 2>&1
exit 1
fi
# prevent log file from growing too large
tail -n "${LOG_MAX_LINES}" "${LOG_FILE}" >"${LOG_FILE}.tmp" 2>/dev/null
mv "${LOG_FILE}.tmp" "${LOG_FILE}" 2>/dev/null
echo "=== $(date) ===" >>"${LOG_FILE}" 2>&1
if [ -f "${CONF_FSTAB}" ]; then
/system/bin/sh "${MODDIR}/fstab.sh" --su-options "${su_options}" --log-file "${LOG_FILE}" "${CONF_FSTAB}" &
else
echo "${CONF_FSTAB} not found." >>"${LOG_FILE}" 2>&1
fi
wait
# Lock wird durch trap am Ende automatisch freigegeben
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