xrsh-buildroot/buildroot-v86/board/v86/rootfs_overlay/etc/profile.xrsh

#!/bin/sh

test -d /dev/browser || {

  move_root_to_9pfs(){
    test -d /mnt/root && return 0
    mv /root /mnt/.
    ln -fs /mnt/root /root
  }

  setup_links(){
    ln -fs /etc/motd ~/.motd 
    ln -fs /mnt/profile.browser ~/.profile.browser
    chmod +x ~/.profile.js
  }

  setup_browser_dev(){
    mkdir -p /dev/browser 
    echo 1 > /mnt/console.tty
    ln -s /mnt/console.tty /dev/browser/tty
    ln -fs /mnt/js /dev/browser/js
    ln -fs /mnt/index.html /dev/browser/html
    ln -fs /mnt/console /dev/browser/console
    touch /mnt/console
    touch /mnt/index.html
  }

  setup_network(){
    test -n "$BROWSER" || return 0
    #mount -a
    udhcpc 1>>/var/log/network.log 2>>/var/log/network.log & 
    echo 0 > /proc/sys/kernel/printk
  }

  setup_overlayfs(){
    test -f /mnt/overlayfs.zip && unzip /mnt/overlayfs.zip -d /
  }

  setup_incoming_cmds(){
    # listen for shell cmds passed to v86 from browser 
    # (via isoterminal.exec(...)) 
    stty raw < /dev/ttyS1
    cat /dev/ttyS1 | xargs -I{} /bin/sh -c 'source /etc/profile; logger "isoterminal.exec({})"; {}'
  }

  setup_listen_homedir(){
    sleep 4 # wait for inode of /mnt/root to become live (due to move_root_to_9pfs)
    infinite inotifyd echo /mnt/root | awk '

      # listen for writes to rootdir and send them to DOM 
      /^[we] \/mnt\/root index\.html/ { system("cat "$2"/"$3" | grep -vE \"^#!\" > /dev/browser/html") }
      /^[we] \/mnt\/root index\.js/   { system("cat "$2"/"$3" | grep -vE \"^#!\" > /dev/browser/js") }

    '
  }

  move_root_to_9pfs
  setup_browser_dev
  setup_links
  setup_network
  setup_overlayfs
  setup_incoming_cmds &
  setup_listen_homedir &
}