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

recipes/shells/bash/etc/profile

@@ -0,0 +1,27 @@
+# /etc/profile: system-wide .profile file for the Bourne shell (sh(1))
+# and Bourne compatible shells (bash(1), ksh(1), ash(1), ...).
+
+if [ "${PS1-}" ]; then
+  if [ "${BASH-}" ] && [ "$BASH" != "/bin/sh" ]; then
+    # The file bash.bashrc already sets the default PS1.
+    # PS1='\h:\w\$ '
+    if [ -f /etc/bash.bashrc ]; then
+      . /etc/bash.bashrc
+    fi
+  else
+    if [ "$(id -u)" -eq 0 ]; then
+      PS1='# '
+    else
+      PS1='$ '
+    fi
+  fi
+fi
+
+if [ -d /etc/profile.d ]; then
+  for i in /etc/profile.d/*.sh; do
+    if [ -r $i ]; then
+      . $i
+    fi
+  done
+  unset i
+fi

recipes/shells/bash/etc/skel/.bashrc

@@ -0,0 +1,99 @@
+# ~/.bashrc: executed by bash(1) for non-login shells.
+
+# If not running interactively, don't do anything
+case $- in
+    *i*) ;;
+      *) return;;
+esac
+
+# don't put duplicate lines or lines starting with space in the history.
+# See bash(1) for more options
+HISTCONTROL=ignoreboth
+
+# append to the history file, don't overwrite it
+shopt -s histappend
+
+# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
+HISTSIZE=1000
+HISTFILESIZE=2000
+
+# check the window size after each command and, if necessary,
+# update the values of LINES and COLUMNS.
+shopt -s checkwinsize
+
+# If set, the pattern "**" used in a pathname expansion context will
+# match all files and zero or more directories and subdirectories.
+#shopt -s globstar
+
+# make less more friendly for non-text input files, see lesspipe(1)
+[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"
+
+# set a fancy prompt (non-color, unless we know we "want" color)
+case "$TERM" in
+    xterm-color|*-256color) color_prompt=yes;;
+esac
+
+# uncomment for a colored prompt, if the terminal has the capability; turned
+# off by default to not distract the user: the focus in a terminal window
+# should be on the output of commands, not on the prompt
+#force_color_prompt=yes
+
+if [ -n "$force_color_prompt" ]; then
+    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
+        # We have color support; assume it's compliant with Ecma-48
+        # (ISO/IEC-6429). (Lack of such support is extremely rare, and such
+        # a case would tend to support setf rather than setaf.)
+        color_prompt=yes
+    else
+        color_prompt=
+    fi
+fi
+
+if [ "$color_prompt" = yes ]; then
+    PS1='${redox_chroot:+($redox_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
+else
+    PS1='${redox_chroot:+($redox_chroot)}\u@\h:\w\$ '
+fi
+unset color_prompt force_color_prompt
+
+# enable color support of ls and also add handy aliases
+if [ -x /usr/bin/dircolors ]; then
+    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
+    alias ls='ls --color=auto'
+    #alias dir='dir --color=auto'
+    #alias vdir='vdir --color=auto'
+
+    alias grep='grep --color=auto'
+    alias fgrep='fgrep --color=auto'
+    alias egrep='egrep --color=auto'
+fi
+
+# colored GCC warnings and errors
+#export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'
+
+# some more ls aliases
+alias ll='ls -alF'
+alias la='ls -A'
+alias l='ls -CF'
+
+# TODO
+# Add an "alert" alias for long running commands.  Use like so:
+#   sleep 10; alert
+# alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"'
+
+# Alias definitions.
+# You may want to put all your additions into a separate file like
+# ~/.bash_aliases, instead of adding them here directly.
+
+if [ -f ~/.bash_aliases ]; then
+    . ~/.bash_aliases
+fi
+
+# enable programmable completion features (you don't need to enable
+# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
+# sources /etc/bash.bashrc).
+if ! shopt -oq posix; then
+ if [ -f /etc/bash_completion ]; then
+   . /etc/bash_completion
+ fi
+fi

recipes/shells/bash/etc/skel/.profile

@@ -0,0 +1,25 @@
+# ~/.profile: executed by the command interpreter for login shells.
+# This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login
+# exists.
+
+# the default umask is set in /etc/profile; for setting the umask
+# for ssh logins, install and configure the libpam-umask package.
+#umask 022
+
+# if running bash
+if [ -n "$BASH_VERSION" ]; then
+    # include .bashrc if it exists
+    if [ -f "$HOME/.bashrc" ]; then
+        . "$HOME/.bashrc"
+    fi
+fi
+
+# set PATH so it includes user's private bin if it exists
+if [ -d "$HOME/bin" ] ; then
+    PATH="$HOME/bin:$PATH"
+fi
+
+# set PATH so it includes user's private bin if it exists
+if [ -d "$HOME/.local/bin" ] ; then
+    PATH="$HOME/.local/bin:$PATH"
+fi

recipes/shells/bash/recipe.toml

@@ -0,0 +1,24 @@
+[source]
+tar = "https://ftp.gnu.org/gnu/bash/bash-5.2.15.tar.gz"
+blake3 = "c1548e3f2a9b6de5296e18c28b3d2007985e647273e03f039efd3e489edaa41f"
+patches = [
+    "redox.patch"
+]
+
+[build]
+template = "custom"
+dependencies = [
+    "termcap",
+]
+script = """
+# compiled statically
+COOKBOOK_CONFIGURE_FLAGS+=(
+    bash_cv_func_sigsetjmp=no
+    bash_cv_getenv_redef=no
+    --enable-static-link # This ensures loadables are not built, which will fail
+)
+COOKBOOK_MAKE_JOBS=1 # workaround for parallel make bugs
+cookbook_configure
+ln -s "bash" "${COOKBOOK_STAGE}/usr/bin/sh"
+cp -r "${COOKBOOK_RECIPE}/etc" "${COOKBOOK_STAGE}/etc"
+"""

recipes/shells/bash/redox.patch

@@ -0,0 +1,236 @@
+diff -ruwN source/bashline.c source-new/bashline.c
+--- source/bashline.c	2022-04-18 05:37:12.000000000 +0700
++++ source-new/bashline.c	2025-09-01 04:36:35.272926519 +0700
+@@ -2645,7 +2645,7 @@
+      const char *text;
+      int state;
+ {
+-#if defined (__WIN32__) || defined (__OPENNT) || !defined (HAVE_GRP_H)
++#if defined (__WIN32__) || defined (__OPENNT) || !defined (HAVE_GRP_H) || defined(__redox__)
+   return ((char *)NULL);
+ #else
+   static char *gname = (char *)NULL;
+diff -ruwN source/builtins/ulimit.def source-new/builtins/ulimit.def
+--- source/builtins/ulimit.def	2021-11-05 20:19:53.000000000 +0700
++++ source-new/builtins/ulimit.def	2025-09-01 04:36:35.272926519 +0700
+@@ -609,7 +609,7 @@
+       }
+   else
+     {
+-#if defined (HAVE_RESOURCE)
++#if defined (HAVE_RESOURCE) && !defined(__redox__)
+       if (getrlimit (limits[ind].parameter, &limit) < 0)
+ 	return -1;
+ #  if defined (HPUX9)
+diff -ruwN source/config-top.h source-new/config-top.h
+--- source/config-top.h	2021-11-05 20:11:12.000000000 +0700
++++ source-new/config-top.h	2025-09-19 21:55:55.439030906 +0700
+@@ -199,3 +199,6 @@
+ /* Undefine or define to 0 if you don't want to allow associative array
+    assignment using a compound list of key-value pairs. */
+ #define ASSOC_KVPAIR_ASSIGNMENT 1
++
++/* Don't check for a valid inode number when pattern matching on Redox */
++#define BROKEN_DIRENT_D_INO 1
+diff -ruwN source/configure source-new/configure
+--- source/configure	2022-09-23 21:13:22.000000000 +0700
++++ source-new/configure	2025-09-01 04:52:47.542177017 +0700
+@@ -3298,6 +3298,7 @@
+ *-nsk*)		opt_bash_malloc=no ;;	# HP NonStop
+ *-haiku*)	opt_bash_malloc=no ;;	# Haiku OS
+ *-genode*)	opt_bash_malloc=no ;;	# Genode has no sbrk
++*-redox*)	opt_bash_malloc=no ;;	# Redox OS
+ esac
+ 
+ # memory scrambling on free()
+diff -ruwN source/configure.ac source-new/configure.ac
+--- source/configure.ac	2022-09-23 21:12:27.000000000 +0700
++++ source-new/configure.ac	2025-09-01 04:36:35.275926660 +0700
+@@ -92,6 +92,7 @@
+ *-nsk*)		opt_bash_malloc=no ;;	# HP NonStop
+ *-haiku*)	opt_bash_malloc=no ;;	# Haiku OS
+ *-genode*)	opt_bash_malloc=no ;;	# Genode has no sbrk
++*-redox*)	opt_bash_malloc=no ;;	# Redox OS
+ esac
+ 
+ # memory scrambling on free()
+diff -ruwN source/execute_cmd.c source-new/execute_cmd.c
+--- source/execute_cmd.c	2022-12-14 00:09:02.000000000 +0700
++++ source-new/execute_cmd.c	2025-09-01 04:36:35.275926660 +0700
+@@ -1379,11 +1379,11 @@
+   nullcmd = (command == 0) || (command->type == cm_simple && command->value.Simple->words == 0 && command->value.Simple->redirects == 0);
+   if (posixly_correct && nullcmd)
+     {
+-#if defined (HAVE_GETRUSAGE)
++#if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY)
+       selfb.ru_utime.tv_sec = kidsb.ru_utime.tv_sec = selfb.ru_stime.tv_sec = kidsb.ru_stime.tv_sec = 0;
+       selfb.ru_utime.tv_usec = kidsb.ru_utime.tv_usec = selfb.ru_stime.tv_usec = kidsb.ru_stime.tv_usec = 0;
+       before = shellstart;
+-#else
++#elif defined (HAVE_TIMES)
+       before.tms_utime = before.tms_stime = before.tms_cutime = before.tms_cstime = 0;
+       tbefore = shell_start_time;
+ #endif
+diff -ruwN source/general.c source-new/general.c
+--- source/general.c	2022-11-24 05:10:12.000000000 +0700
++++ source-new/general.c	2025-09-19 17:09:24.754782168 +0700
+@@ -589,6 +589,7 @@
+ void
+ check_dev_tty ()
+ {
++#if !defined(__redox__)
+   int tty_fd;
+   char *tty;
+ 
+@@ -603,6 +604,7 @@
+     }
+   if (tty_fd >= 0)
+     close (tty_fd);
++#endif
+ }
+ 
+ /* Return 1 if PATH1 and PATH2 are the same file.  This is kind of
+diff -ruwN source/include/posixwait.h source-new/include/posixwait.h
+--- source/include/posixwait.h	2019-03-30 00:25:52.000000000 +0700
++++ source-new/include/posixwait.h	2025-09-01 04:36:35.276926707 +0700
+@@ -34,7 +34,7 @@
+ 
+ /* How to get the status of a job.  For Posix, this is just an
+    int, but for other systems we have to crack the union wait. */
+-#if !defined (_POSIX_VERSION)
++#if 0
+ typedef union wait WAIT;
+ #  define WSTATUS(t)  (t.w_status)
+ #else /* _POSIX_VERSION */
+@@ -50,7 +50,7 @@
+ 
+ /* More Posix P1003.1 definitions.  In the POSIX versions, the parameter is
+    passed as an `int', in the non-POSIX version, as `union wait'. */
+-#if defined (_POSIX_VERSION)
++#if 1
+ 
+ #  if !defined (WSTOPSIG)
+ #    define WSTOPSIG(s)       ((s) >> 8)
+diff --color -ruwN source/jobs.c source-new/jobs.c
+--- source/jobs.c	2022-12-14 00:09:02.000000000 +0700
++++ source-new/jobs.c	2026-02-09 23:29:28.811403291 +0700
+@@ -4417,9 +4417,11 @@
+ 	{
+ 	  shell_pgrp = getpid ();
+ 	  setpgid (0, shell_pgrp);
++  }
++
++    // shell pgrep is not set automatically on Redox
+ 	  if (shell_tty != -1)
+ 	    tcsetpgrp (shell_tty, shell_pgrp);
+-	}
+ 
+       tty_sigs = 0;
+       while ((terminal_pgrp = tcgetpgrp (shell_tty)) != -1)
+diff -ruwN source/lib/readline/input.c source-new/lib/readline/input.c
+--- source/lib/readline/input.c	2022-04-09 02:43:24.000000000 +0700
++++ source-new/lib/readline/input.c	2025-09-01 04:36:35.276926707 +0700
+@@ -805,7 +805,7 @@
+   int result;
+   unsigned char c;
+   int fd;
+-#if defined (HAVE_PSELECT)
++#if defined (HAVE_PSELECT) || defined (HAVE_SELECT)
+   sigset_t empty_set;
+   fd_set readfds;
+ #endif
+diff -ruwN source/lib/readline/terminal.c source-new/lib/readline/terminal.c
+--- source/lib/readline/terminal.c	2022-04-05 21:44:17.000000000 +0700
++++ source-new/lib/readline/terminal.c	2025-09-01 04:36:35.286927174 +0700
+@@ -102,7 +102,7 @@
+ 
+ static int tcap_initialized;
+ 
+-#if !defined (__linux__) && !defined (NCURSES_VERSION)
++#if !defined (__linux__) && !defined (NCURSES_VERSION) && !defined (__redox__)
+ #  if defined (__EMX__) || defined (NEED_EXTERN_PC)
+ extern 
+ #  endif /* __EMX__ || NEED_EXTERN_PC */
+diff -ruwN source/lib/sh/getcwd.c source-new/lib/sh/getcwd.c
+--- source/lib/sh/getcwd.c	2012-03-10 22:48:50.000000000 +0700
++++ source-new/lib/sh/getcwd.c	2025-09-01 04:36:35.286927174 +0700
+@@ -20,7 +20,7 @@
+ 
+ #include <config.h>
+ 
+-#if !defined (HAVE_GETCWD)
++#if !defined (HAVE_GETCWD) && !defined(__redox__)
+ 
+ #if !defined (__GNUC__) && !defined (HAVE_ALLOCA_H) && defined (_AIX)
+   #pragma alloca
+diff -ruwN source/lib/sh/input_avail.c source-new/lib/sh/input_avail.c
+--- source/lib/sh/input_avail.c	2021-05-24 22:16:33.000000000 +0700
++++ source-new/lib/sh/input_avail.c	2025-09-01 04:36:35.298927735 +0700
+@@ -33,7 +33,7 @@
+ #  include <sys/file.h>
+ #endif /* HAVE_SYS_FILE_H */
+ 
+-#if defined (HAVE_PSELECT)
++#if defined (HAVE_PSELECT) || defined (HAVE_SELECT)
+ #  include <signal.h>
+ #endif
+ 
+diff -ruwN source/lib/sh/strtoimax.c source-new/lib/sh/strtoimax.c
+--- source/lib/sh/strtoimax.c	2021-09-10 21:32:35.000000000 +0700
++++ source-new/lib/sh/strtoimax.c	2025-09-01 04:36:35.301927876 +0700
+@@ -55,6 +55,8 @@
+ extern long long strtoll PARAMS((const char *, char **, int));
+ #endif
+ 
++#if !defined (__redox__)
++
+ #ifdef strtoimax
+ #undef strtoimax
+ #endif
+@@ -79,6 +81,8 @@
+   return (strtol (ptr, endptr, base));
+ }
+ 
++#endif
++
+ #ifdef TESTING
+ # include <stdio.h>
+ int
+diff -ruwN source/parse.y source-new/parse.y
+--- source/parse.y	2022-12-14 00:09:02.000000000 +0700
++++ source-new/parse.y	2025-09-01 04:36:35.302927923 +0700
+@@ -2625,6 +2625,7 @@
+       parser_state |= PST_ENDALIAS;
+       /* We need to do this to make sure last_shell_getc_is_singlebyte returns
+ 	 true, since we are returning a single-byte space. */
++#if defined (HANDLE_MULTIBYTE)
+       if (shell_input_line_index == shell_input_line_len && last_shell_getc_is_singlebyte == 0)
+ 	{
+ #if 0
+@@ -2638,6 +2639,7 @@
+ 	  shell_input_line_property[shell_input_line_index - 1] = 1;
+ #endif
+ 	}
++#endif /* HANDLE_MULTIBYTE */
+       return ' ';	/* END_ALIAS */
+     }
+ #endif
+diff -ruwN source/y.tab.c source-new/y.tab.c
+--- source/y.tab.c	2022-12-14 00:09:02.000000000 +0700
++++ source-new/y.tab.c	2025-09-01 04:36:35.307928157 +0700
+@@ -4936,6 +4936,7 @@
+       parser_state |= PST_ENDALIAS;
+       /* We need to do this to make sure last_shell_getc_is_singlebyte returns
+ 	 true, since we are returning a single-byte space. */
++#if defined (HANDLE_MULTIBYTE)
+       if (shell_input_line_index == shell_input_line_len && last_shell_getc_is_singlebyte == 0)
+ 	{
+ #if 0
+@@ -4949,6 +4950,7 @@
+ 	  shell_input_line_property[shell_input_line_index - 1] = 1;
+ #endif
+ 	}
++#endif /* HANDLE_MULTIBYTE */
+       return ' ';	/* END_ALIAS */
+     }
+ #endif