#! /usr/bin/env bash

if [ "$1" == "--fake" ]; then
	echo "true"

	exit 0
fi

# Some systems do not compile well with this fake uname in place
# provide the real uname for them.
case "${CROSS}" in
	mipsel-unknown-linux-uclibc)
		unset CROSS
		;;
esac

if [ -z "${CROSS}" ]; then
	# If not cross compiling, revert to system uname
	while [ "$(uname --fake 2>/dev/null)" == "true" -a -n "${PATH}" ]; do
		PATH="$(echo "${PATH}" | /usr/bin/sed 's@^[^:]*$@@;s@^[^:]*:@@')"

		export PATH
	done

	if [ -z "${PATH}" ]; then
		exit 1
	fi

	exec uname "$@"
fi

CROSS="$(echo "${CROSS}" | sed 's@-*$@@')"

# Determine release information
case "${CROSS}" in
	*-hpux11*)
		sysname="HP-UX"
		sysrelease="$(echo "${CROSS}" | sed 's@^.*-hpux@@')"
		;;
	*-solaris2*)
		sysname="SunOS"
		sysrelease="$(echo "${CROSS}" | sed 's@^.*-solaris@@;s@^2@5@')"
		;;
	*-linux*)
		sysname="Linux"
		sysrelease="2.6.5"
		;;
	*-netbsd*)
		sysname="NetBSD"
		sysrelease="$(echo "${CROSS}" | sed 's@^.*-netbsd@@;s@$@.0@')"
		;;
	*-freebsd*)
		sysname="FreeBSD"
		sysrelease="$(echo "${CROSS}" | sed 's@^.*-freebsd@@;s@$@.0-RELEASE@')"
		;;
esac

# Determine machine information
case "${CROSS}" in
	hppa64-*-hpux*)
		sysmachine="9000/859"
		;;
	i386-*-solaris*)
		sysmachine="i86pc"
		;;
	sparc-*-solaris*)
		sysmachine="sun4u"
		;;
	x86_64-*)
		sysmachine="x86_64"
		;;
	i?86-*)
		sysmachine="i686"
		;;
	ia64-*)
		sysmachine="ia64"
		;;
	arm-*|armel-*|armeb-*)
		sysmachine="armv7l"
		;;
	mipsel-*|mipseb-*)
		sysmachine="mips"
		;;
esac

for arg in $(echo "$@" | sed 's@.@ & @g'); do
	case "${arg}" in
		-)
			continue
			;;
		r)
			retval="${retval} ${sysrelease}"
			;;
		s)
			retval="${retval} ${sysname}"
			;;
		m)
			retval="${retval} ${sysmachine}"
			;;
		p)
			# XXX
			retval="${retval} ${syscpu}"
			;;
		n)
			retval="${retval} $(hostname)"
			;;
		a)
			retval="${sysname} $(hostname) ${sysrelease} ${sysversion} ${sysmachine} ${syscpu}"
			;;
	esac
done

echo "${retval}" | sed 's@^  *@@;s@  *$@@'
