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#!/system/bin/sh
# fstab.sh
# Reads an fstab-style config and performs mounts/swapon without touching /etc/fstab.
# - Messages go to console AND to $LOG_FILE.
# - Privileged commands (mkdir, mount, swapon) run via: su --mount-master -c "…"
#
# Usage: ./fstab.sh path/to/fstab.conf
# Override log file by exporting LOG_FILE before running.
FSTAB_FILE="$1"
if [ -z "$FSTAB_FILE" ]; then
echo "Usage: $0 path/to/fstab.conf"
exit 2
fi
if [ ! -r "$FSTAB_FILE" ]; then
echo "File '$FSTAB_FILE' not readable."
exit 2
fi
# Ensure 'su' exists
if ! command -v su >/dev/null 2>&1; then
echo "ERROR: 'su' not found. Cannot perform privileged operations."
exit 2
fi
error_count=0
line_no=0
# --- logging helpers (both console and file) ---
log() { echo "$*" | tee -a "$LOG_FILE"; }
warn() { echo "WARN: $*" | tee -a "$LOG_FILE"; }
err() { echo "ERROR: $*" | tee -a "$LOG_FILE"; error_count=`expr $error_count + 1`; }
# --- safe single-quoting for building a command string for su -c ---
shell_quote() {
# Output a single-quoted representation of $1, handling internal single quotes
# 'abc'd' -> 'abc'"'"'d'
printf "'%s'" "$(printf "%s" "$1" | sed "s/'/'\"'\"'/g")"
}
# --- run a command as root via su --mount-master -c "..." preserving args safely ---
# Usage: run_root CMD ARG1 ARG2 ...
run_root() {
cmd="$1"; shift
# Build a single string: CMD 'ARG1' 'ARG2' ...
cmdline=$(shell_quote "$cmd")
for a in "$@"; do
cmdline="$cmdline $(shell_quote "$a")"
done
log "RUN (as root): $cmd $*"
# Execute
su $su_options -c "$cmdline"
rc=$?
[ $rc -ne 0 ] && err "Command failed (exit $rc): $cmd $*"
return $rc
}
# --- check if a mountpoint is already mounted (no root needed) ---
is_mounted() {
mp="$1"
if command -v mountpoint >/dev/null 2>&1; then
mountpoint -q "$mp"
return $?
fi
grep -qs " $mp " /proc/mounts
return $?
}
# --- check if swap device is already active (no root needed) ---
is_swap_active() {
spec="$1"
if command -v swapon >/dev/null 2>&1; then
# Prefer swapon --show if available
run_root swapon --show=NAME --noheadings 2>/dev/null | grep -Fxq "$spec" && return 0
basename_spec=`basename "$spec"`
run_root swapon --show=NAME --noheadings 2>/dev/null | awk -F/ '{print $NF}' | grep -Fxq "$basename_spec" && return 0
return 1
fi
grep -qs "^$spec[[:space:]]" /proc/swaps
return $?
}
# --- process each fstab line ---
while IFS= read -r rawline || [ -n "$rawline" ]; do
line_no=`expr $line_no + 1`
line=`echo "$rawline" | sed 's/^[[:space:]]*//;s/[[:space:]]*$//'`
case "$line" in
""|\#*) continue ;;
esac
# spec file vfstype mntops dump pass (default 0 for last two if missing)
set -- `echo "$line" | awk '{print $1, $2, $3, $4, ($5? $5:0), ($6? $6:0)}'`
fs_spec=$1
fs_file=$2
fs_vfstype=$3
fs_mntops=$4
fs_freq=$5
fs_pass=$6
if [ -z "$fs_spec" ] || [ -z "$fs_file" ] || [ -z "$fs_vfstype" ]; then
warn "Line $line_no: Invalid entry, skipped."
continue
fi
echo "$fs_mntops" | grep -qw noauto && {
log "Line $line_no: 'noauto' found, skipping $fs_spec -> $fs_file."
continue
}
# --- swap handling ---
if [ "$fs_vfstype" = "swap" ]; then
if is_swap_active "$fs_spec"; then
log "Line $line_no: Swap '$fs_spec' already active — skipped."
continue
fi
if command -v swapon >/dev/null 2>&1; then
log "Line $line_no: Activating swap: $fs_spec"
if [ "$fs_mntops" = "-" ]; then
run_root swapon "$fs_spec" || true
else
run_root swapon -o "$fs_mntops" "$fs_spec" || true
fi
else
err "Line $line_no: swapon not available."
fi
continue
fi
# --- bind / rbind mounts ---
echo "$fs_mntops" | grep -q bind && {
if is_mounted "$fs_file"; then
log "Line $line_no: $fs_file already mounted — skipped."
continue
fi
if [ ! -e "$fs_file" ]; then
log "Line $line_no: Creating mountpoint $fs_file"
run_root mkdir -p "$fs_file" || { err "Line $line_no: mkdir failed for $fs_file"; continue; }
fi
if echo "$fs_mntops" | grep -qw rbind; then
log "Line $line_no: rbind mount: $fs_spec -> $fs_file"
run_root mount --rbind "$fs_spec" "$fs_file" || true
else
log "Line $line_no: bind mount: $fs_spec -> $fs_file"
run_root mount --bind "$fs_spec" "$fs_file" || true
fi
continue
}
# --- regular filesystem mounts ---
if is_mounted "$fs_file"; then
log "Line $line_no: $fs_file already mounted — skipped."
continue
fi
if [ ! -e "$fs_file" ]; then
log "Line $line_no: Creating mountpoint $fs_file"
run_root mkdir -p "$fs_file" || { err "Line $line_no: mkdir failed"; continue; }
fi
if [ "$fs_mntops" = "-" ]; then
log "Line $line_no: Mounting $fs_spec -> $fs_file (type=$fs_vfstype)"
run_root mount -t "$fs_vfstype" "$fs_spec" "$fs_file" || true
else
log "Line $line_no: Mounting $fs_spec -> $fs_file (type=$fs_vfstype, opts=$fs_mntops)"
run_root mount -t "$fs_vfstype" -o "$fs_mntops" "$fs_spec" "$fs_file" || true
fi
done < "$FSTAB_FILE"
if [ $error_count -gt 0 ]; then
echo "Done: $error_count errors occurred." | tee -a "$LOG_FILE"
exit 1
else
echo "Done: all entries processed successfully." | tee -a "$LOG_FILE"
exit 0
fi
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