#!/bin/sh

# System initialization sequence:
#
# /init
#  |
#  +--(1) /etc/01_prepare.sh
#  |
#  +--(2) /etc/02_overlay.sh
#          |
#          +-- /etc/03_init.sh (this file)
#               |
#               +-- /sbin/init
#                    |
#                    +--(1) /etc/04_bootscript.sh
#                    |       |
#                    |       +-- udhcpc
#                    |           |
#                    |           +-- /etc/05_rc.udhcp
#                    |
#                    +--(2) /bin/sh (Alt + F1, main console)
#                    |
#                    +--(2) /bin/sh (Alt + F2)
#                    |
#                    +--(2) /bin/sh (Alt + F3)
#                    |
#                    +--(2) /bin/sh (Alt + F4)

# If you have persistent overlay support then you can edit this file and replace
# the default initialization  of the system. For example, you could use this:
#
# exec setsid cttyhach sh
#
# This gives you PID 1 shell inside the initramfs area. Since this is a PID 1
# shell, you can still invoke the original initialization logic by executing
# this command:
#
# exec /sbin/init

# Print first message on screen.
cat /etc/msg/03_init_01.txt

# Wait 5 second or until any keybord key is pressed.
read -t 5 -n1 -s key

if test $key = ""  {
  # Use default initialization logic based on configuration in '/etc/inittab'.
  echo "Executing /sbin/init as PID 1."
  exec /sbin/init
} else {
  # Print second message on screen.
  cat /etc/msg/03_init_02.txt

  if test $PID1_SHELL = "true"  {
    # PID1_SHELL flag is set which means we have controlling terminal.
    unset PID1_SHELL
    exec sh
  } else {
    # Interactive shell with controlling tty as PID 1.
    exec setsid cttyhack sh
  }
}

echo "(/etc/03_init.sh) - there is a serious bug..."

# Wait until any key has been pressed.
read -n1 -s

(CommandList
  children: [
    (C {(cat)} {(/etc/msg/03_init_01.txt)})
    (C {(read)} {(-t)} {(5)} {(-n1)} {(-s)} {(key)})
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: 
                (C {(Lit_Other "[")} {(DQ ($ VSub_Name "$key"))} {(Lit_Other "=")} {(DQ )} 
                  {(Lit_Other "]")}
                )
              terminator: <Op_Semi ";">
            )
          ]
          action: [(C {(echo)} {(DQ ("Executing /sbin/init as PID 1."))}) (C {(exec)} {(/sbin/init)})]
          spids: [-1 152]
        )
      ]
      else_action: [
        (C {(cat)} {(/etc/msg/03_init_02.txt)})
        (If
          arms: [
            (if_arm
              cond: [
                (Sentence
                  child: 
                    (C {(Lit_Other "[")} {(DQ ($ VSub_Name "$PID1_SHELL"))} {(Lit_Other "=")} 
                      {(DQ (true))} {(Lit_Other "]")}
                    )
                  terminator: <Op_Semi ";">
                )
              ]
              action: [(C {(unset)} {(PID1_SHELL)}) (C {(exec)} {(sh)})]
              spids: [-1 201]
            )
          ]
          else_action: [(C {(exec)} {(setsid)} {(cttyhack)} {(sh)})]
          spids: [218 234]
        )
      ]
      spids: [170 236]
    )
    (C {(echo)} {(DQ ("(/etc/03_init.sh) - there is a serious bug..."))})
    (C {(read)} {(-n1)} {(-s)})
  ]
)