#!/bin/sh

fail () { echo "$@" >&2; exit 1; }
necho () { echo "$@" | tr -d \\012; }

needroot ()
{
    [ x$ID = x0 -o x"$TE" != x ] && return
    [ x$NEEDROOTLOOP != x ] && return; NEEDROOTLOOP=1; export NEEDROOTLOOP

    necho "Command  $cmd requires root access. "
    d=${ROOTUSER:-root}
    necho "Please enter your root id [$d]: "
    read r rest
    : ${r:=$d}

    # Can not use $@ inside su ... -c "...", therefore ...
    x=`for i in "$@"; do echo $i | sed "s/'/'\\\\\''/g; s/.*/ '&'/"; done \
        | tr -d '\012'; echo`
    # ... tested with some Linux, OpenBSD and Solaris /bin/sh:s

    unset POSIXLY_CORRECT # This with next line is the most portable option(?)
    exec su ${r:-root} -c "exec sh $0 $cmd $x"
#   exec su ${r:-root} "exec sh $0 $cmd $x"
    exit 0
}

pre () 
{
    test x"$1" = x && fail Usage: $0 imagefile
    test -x flasher || fail No flasher binary in current directory
    test -f "$1" || fail $1: No such file
    needroot "$@"
    echo
    echo Switch off power from 770 and plug USB cable in '(then press enter)'.
    read line
    echo Press home button down, keep it down while powering 770 on...
    echo
}


cmd_fiasco () ## flash fiasco (full fs?)
{
    pre "$@"
    echo ... And wait until upload complete and 700 has rebooted.
    ./flasher -F "$1" -f -R
}

cmd_kernel () ## flash kernel
{
    pre "$@"
    ./flasher -f -k "$1"
    sleep 1
    echo ... now you can unplug usb cable from your 770.
}

[ x"$1" = x ] && {
	echo
	#echo Usage: $0 '[-n] <command> [args]'
	echo Usage: $0 '<command> [args]'
	echo
	echo $0 commands available:
	echo
	sed -n '/^cmd_[a-z]/ { s/^cmd_/ /; s/[ ]()[ ]//; s/#/ /g; p; }' $0
#	echo
#	echo 'with option -n the operation is simulated (semi-accurately).'
	echo
	exit 0
}

cmd=$1; shift

cc=
for i in `sed -n 's/^cmd_\([a-z_]*\) (.*/\1/p' $0`
do
	case $i in $cmd*) cp=$cc; cc="$i $cc";; esac
done

[ x"$cc" = x ] && { echo $0: $cmd -- command not found.; exit 1; }

[ x"$cp" != x ] && { echo $0: $cmd -- ambiquous command: matches $cc; exit 1; }

cmd=$cc

cmd_$cc "$@"
exit 0