Red Bear OS — microkernel OS in Rust, based on Redox

Derivative of Redox OS (https://www.redox-os.org) adding:
- AMD GPU driver (amdgpu) via LinuxKPI compat layer
- ext4 filesystem support (ext4d scheme daemon)
- ACPI fixes for AMD bare metal (x2APIC, DMAR, IVRS, MCFG)
- Custom branding (hostname, os-release, boot identity)

Build system is full upstream Redox with RBOS overlay in local/.
Patches for kernel, base, and relibc are symlinked from local/patches/
and protected from make clean/distclean. Custom recipes live in
local/recipes/ with symlinks into the recipes/ search path.

Build:  make all CONFIG_NAME=redbear-full
Sync:   ./local/scripts/sync-upstream.sh

scripts/mount-redoxfs.sh

@@ -0,0 +1,119 @@
+#!/usr/bin/env bash
+
+set -e
+
+MOUNT_POINT="/mnt/rbos"
+DISK_DEVICE=""
+
+show_help() {
+    echo "Usage: $0 [options] <device>"
+    echo ""
+    echo "Mount or unmount a Red Bear OS filesystem partition"
+    echo ""
+    echo "Options:"
+    echo "  -u, --unmount    Unmount the RBOS filesystem partition"
+    echo "  -m, --mount-point PATH    Custom mount point (default: /mnt/rbos)"
+    echo "  -h, --help       Show this help"
+    echo ""
+    echo "Examples:"
+    echo "  $0 /dev/sda3                    Mount /dev/sda3"
+    echo "  $0 -u                           Unmount from default location"
+    echo "  $0 -m /mnt/my-rbos /dev/sda3   Mount to custom location"
+}
+
+unmount_fs() {
+    if mountpoint -q "$MOUNT_POINT" 2>/dev/null; then
+        echo "Unmounting RBOS filesystem from $MOUNT_POINT..."
+        fusermount -u "$MOUNT_POINT" || fusermount3 -u "$MOUNT_POINT"
+        echo "Successfully unmounted"
+    else
+        echo "Nothing mounted at $MOUNT_POINT"
+    fi
+    exit 0
+}
+
+check_dependencies() {
+    # Try to find redoxfs in multiple locations
+    REDOXFS_BIN=""
+    if [ -x "build/fstools/bin/redoxfs" ]; then
+        REDOXFS_BIN="build/fstools/bin/redoxfs"
+    elif [ -x "$(dirname "$0")/../build/fstools/bin/redoxfs" ]; then
+        REDOXFS_BIN="$(dirname "$0")/../build/fstools/bin/redoxfs"
+    elif command -v redoxfs &> /dev/null; then
+        REDOXFS_BIN="redoxfs"
+    fi
+
+    if [ -z "$REDOXFS_BIN" ]; then
+        echo "Error: redoxfs command not found"
+        echo "Please build it first with: make fstools"
+        exit 1
+    fi
+
+    if ! ldconfig -p 2>/dev/null | grep -q "libfuse3"; then
+        echo "Error: libfuse 3.x is not installed"
+        echo "Please install it:"
+        if command -v apt-get &> /dev/null; then
+            echo "  sudo apt-get install fuse3 libfuse3-dev"
+        elif command -v dnf &> /dev/null; then
+            echo "  sudo dnf install fuse3-devel"
+        elif command -v pacman &> /dev/null; then
+            echo "  sudo pacman -S fuse3"
+        else
+            echo "  (check your package manager for fuse3)"
+        fi
+        exit 1
+    fi
+}
+
+UNMOUNT=false
+
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -u|--unmount)
+            UNMOUNT=true
+            shift
+            ;;
+        -m|--mount-point)
+            MOUNT_POINT="$2"
+            shift 2
+            ;;
+        -h|--help)
+            show_help
+            exit 0
+            ;;
+        *)
+            DISK_DEVICE="$1"
+            shift
+            ;;
+    esac
+done
+
+if [ "$UNMOUNT" = true ]; then
+    unmount_fs
+fi
+
+if [ -z "$DISK_DEVICE" ]; then
+    DISK_DEVICE="/dev/disk/by-partlabel/RBOS_INSTALL"
+    if [ ! -b "$DISK_DEVICE" ]; then
+        echo "Error: No device specified and default partition not found"
+        echo ""
+        show_help
+        exit 1
+    fi
+fi
+
+if [ ! -b "$DISK_DEVICE" ] && [ ! -f "$DISK_DEVICE" ]; then
+    echo "Error: $DISK_DEVICE is not a block device or file"
+    exit 1
+fi
+
+check_dependencies
+
+mkdir -p "$MOUNT_POINT"
+
+echo "Mounting $DISK_DEVICE to $MOUNT_POINT..."
+"$REDOXFS_BIN" "$DISK_DEVICE" "$MOUNT_POINT"
+
+echo "RBOS filesystem successfully mounted at $MOUNT_POINT"
+echo "To unmount, run: $0 -u"
+