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

recipes/shells/bash/etc/bash.bashrc

@@ -0,0 +1,39 @@
+# System-wide .bashrc file for interactive bash(1) shells.
+
+# To enable the settings / commands in this file for login shells as well,
+# this file has to be sourced in /etc/profile.
+
+# If not running interactively, don't do anything
+[ -z "$PS1" ] && return
+
+# check the window size after each command and, if necessary,
+# update the values of LINES and COLUMNS.
+shopt -s checkwinsize
+
+# TODO: redox_chroot
+if [ -z "${redox_chroot:-}" ] && [ -r /etc/redox_chroot ]; then
+    redox_chroot=$(cat /etc/redox_chroot)
+fi
+
+# set a fancy prompt (non-color, overwrite the one in /etc/profile)
+# but only if not SUDOing and have SUDO_PS1 set; then assume smart user.
+if ! [ -n "${SUDO_USER}" -a -n "${SUDO_PS1}" ]; then
+  PS1='${redox_chroot:+($redox_chroot)}\u@\h:\w\$ '
+fi
+
+# Commented out, don't overwrite xterm -T "title" -n "icontitle" by default.
+# If this is an xterm set the title to user@host:dir
+#case "$TERM" in
+#xterm*|rxvt*)
+#    PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME}: ${PWD}\007"'
+#    ;;
+#*)
+#    ;;
+#esac
+
+# enable bash completion in interactive shells
+#if ! shopt -oq posix; then
+# if [ -f /etc/bash_completion ]; then
+#   . /etc/bash_completion
+# fi
+#fi