#!/bin/bash

# Fake uname: override environments uname e.g. in chroot usage
# 2004-02-09, LTu & AMo

# values copied from live system's uname output:
s="Linux"
n="`hostname`"
r="2.4.20-28.9"
v="#1 Thu Dec 18 13:45:22 EST 2003"
m="i686"
p="i868"
i="i386"
o="GNU/Linux"
a="$s $n $r $v $m $p $i $o"

# initialize arrays and variable for return value
for (( j=0; j<9; j=j+1 ))
do
  op[j]=0
done
val[0]=$a
val[1]=$s
val[2]=$n
val[3]=$r
val[4]=$v
val[5]=$m
val[6]=$p
val[7]=$i
val[8]=$o
ret=""

# parse command line options
while getopts "asnrvmpio" opt
do
  case $opt in 
      a ) op[0]=1 ;;  # uname -a
      s ) op[1]=1 ;;  # uname -s
      n ) op[2]=1 ;;  # ...
      r ) op[3]=1 ;;
      v ) op[4]=1 ;;
      m ) op[5]=1 ;;
      p ) op[6]=1 ;;
      i ) op[7]=1 ;;
      o ) op[8]=1 ;;
  esac
done

# print return value(s)
if [ ${op[0]} -eq 1 ]; then  # -a prints everything
    ret="$a"
else
    for (( j=1; j<9; j=j+1)); do
	if [ ${op[$j]} -eq 1 ]; then
	    if [ -n "$ret" ]; then  # add delimiter beetween values
		ret="$ret "
	    fi
	    ret="$ret${val[$j]}"
	fi
    done
fi

if [ -z "$ret" ]; then   # real uname behaviour
    echo Linux
else
    echo $ret
fi

exit 0