Initial commit

scripts/backtunnel-access

@@ -0,0 +1,91 @@
+#!/usr/bin/env bash
+# Copyright (c) 2025. LUXIM d.o.o., Slovenia - Matjaž Mozetič.
+
+# backtunnel-access: Mount a folder shared over reverse SSH
+# Usage: backtunnel-access /path/to/folder from remoteuser:remotehost [-p PORT] [-m MOUNTPOINT]
+
+set -euo pipefail
+
+PORT=2222
+MOUNTPOINT="/mnt/remote-rssh"
+
+usage() {
+  echo "Usage: $0 /path/to/folder from remoteuser:remotehost [-p PORT] [-m MOUNTPOINT]" >&2
+  exit 1
+}
+
+# --- parse positional args ---
+[[ $# -lt 3 ]] && usage
+
+FOLDER=$1
+KEYWORD=$2
+REMOTE=$3
+shift 3 || true
+
+[[ "$KEYWORD" != "from" ]] && usage
+
+# Optional flags
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    -p|--port)
+      [[ $# -lt 2 ]] && usage
+      PORT=$2
+      shift 2
+      ;;
+    -m|--mount-point)
+      [[ $# -lt 2 ]] && usage
+      MOUNTPOINT=$2
+      shift 2
+      ;;
+    -h|--help)
+      usage
+      ;;
+    *)
+      echo "Unknown option: $1" >&2
+      usage
+      ;;
+  esac
+done
+
+# --- split remote user/host (supports user:host or user@host) ---
+REMOTE_USER=""
+REMOTE_HOST=""
+
+if [[ "$REMOTE" == *:* ]]; then
+  REMOTE_USER=${REMOTE%%:*}
+  REMOTE_HOST=${REMOTE#*:}
+elif [[ "$REMOTE" == *"@"* ]]; then
+  REMOTE_USER=${REMOTE%%@*}
+  REMOTE_HOST=${REMOTE#*@}
+else
+  echo "Invalid remote format. Use remoteuser:remotehost or remoteuser@remotehost" >&2
+  exit 1
+fi
+
+# --- deps check ---
+command -v sshfs >/dev/null 2>&1 || { echo "sshfs not found. Install sshfs first."; exit 1; }
+command -v mountpoint >/dev/null 2>&1 || { echo "mountpoint utility not found."; exit 1; }
+
+# --- prepare mountpoint ---
+if [[ ! -d "$MOUNTPOINT" ]]; then
+  mkdir -p -- "$MOUNTPOINT"
+fi
+
+# Avoid double-mount
+if mountpoint -q -- "$MOUNTPOINT"; then
+  echo "Mount point '$MOUNTPOINT' is already mounted. Unmount it first (e.g., 'fusermount -u \"$MOUNTPOINT\"')." >&2
+  exit 1
+fi
+
+echo "🔗 Mounting '$FOLDER' from '$REMOTE_USER@$REMOTE_HOST' via reverse-tunnel localhost:$PORT → '$MOUNTPOINT' ..."
+
+sshfs \
+  -p "$PORT" \
+  -o reconnect \
+  -o ServerAliveInterval=15 \
+  -o ServerAliveCountMax=3 \
+  -o ssh_command="ssh -o ConnectTimeout=10" \
+  -- "$REMOTE_USER@localhost:$FOLDER" "$MOUNTPOINT"
+
+echo "✅ Mounted at: $MOUNTPOINT"
+echo "To unmount:   fusermount -u \"$MOUNTPOINT\""