#!/bin/sh

# vim:noet:ts=2

# Fake the system time

dat="$1"

static=0

if [ "$dat" = "-s" -o "$dat" = "--static" ] ; then

	static=1

	shift

	dat="$1"

fi

if [ "$dat" = "-v" -o "$dat" = "--version" ] ; then

	echo "$0: Version @VERSION@"

	echo ""

	echo "For usage information, use '$0 --help'."

	exit 0

fi

if [ -z "$dat" -o "$dat" = "-h" -o "$dat" = "-?" -o "$dat" = "--help" ] ; then

	echo "Usage: $0 [-s|--static] date program args..."

	echo ""

	echo "Run 'program' with 'args'."

	echo "The program will believe that the current time is 'date'."

	if [ -z "$dat" ] ; then exit 1; else exit 0; fi

fi

shift

# Assume that 'date' already printed an error message

sec1=$(date -d "$dat" '+%s')

[ $? -eq 0 ] || exit 1

sec2=$(expr $(date '+%s') - $sec1)

# According to its documentation expr returns exit status 1,

# when the expression evaluates to 0

[ $? -le 1 ] || exit 1

add_ld_preload()

{

	export LD_PRELOAD="${1}${LD_PRELOAD:+:}${LD_PRELOAD}"

}

add_ld_library_path()

{

	export LD_LIBRARY_PATH="${1}${LD_LIBRARY_PATH:+:}${LD_LIBRARY_PATH}"

}

set_ld_environment()

{

	lib="datefudge.so"

	libpath="@LIBDIR@"

	set --	"$libpath"@MULTIARCH_PATTERN@"/datefudge/$lib"

	if [ ! -e "$1" ]; then

		echo "Cannot find $lib in $libpath" >&2

		[ -z "$POSH_VERSION" ] || echo "You might have just encountered posh bug#636601, please try using another shell." >&2

		exit 1;

	fi

	for path in "$@"; do

		add_ld_library_path "${path%/*}"

	done

	add_ld_preload "$lib"

}

set_datefudge_vars()

{

	if [ "$static" = "1" ]; then

		export DATEFUDGE=$sec1

		export DATEFUDGE_DOSTATIC="1"

	else

		export DATEFUDGE=$sec2

		unset  DATEFUDGE_DOSTATIC

	fi

}

set_ld_environment

set_datefudge_vars

exec "$@"