#!/bin/sh
# envexec -
# This is an exec tool for setting up a defined user environment
# for a test case.
# 
# This can be called as a TET_BUILD_TOOL, TET_CLEAN_TOOL, or TET_EXEC_TOOL.
# When called this looks for the configuration variable TS_ENV_FILE being set 
# in the appropriate TETware configuration file
# (i.e. tetbuild.cfg, tetexec.cfg or tetexec.cfg), and then sets
# any environment variables.
#
# The file specified by TS_ENV_FILE should contain Shell syntax for
# environment variables. These are set in the environment
# prior to executing the test case.
#
# A Debug tool can also be set by TS_DEBUG_TOOL in the appropriate 
# build, clean or execute config file or in the environment using the
# -v flag to cc
#
# Command line arguments can be passed to testcases by using
# TS_CMD_ARGS in the appropriate file
#
# An example use , assuming envexec is in the PATH
# 
#   tcc -p -v TET_EXEC_TOOL=envexec -bec contrib/demo
#
#   tcc -p -v TS_DEBUG_TOOL=strace -v TET_EXEC_TOOL=envexec -bec contrib/demo
#
#   tcc -p -v TS_DEBUG_TOOL=time -v TET_EXEC_TOOL=envexec -e contrib/demo
#
#   tcc -p -v TS_CMD_ARGS="-d" -e contrib/demo
#--------------------------------------------------------------------
# extract the value of TS_ENV_FILE from the configuration for the
# current mode of operation -
# ignore blank lines and comments in the config file
TS_ENV_FILE=
eval `sed -n 's/#.*//
	/^[ 	]*\$/d
	/^TS_ENV_FILE=/s/\([^=]*\)=\(.*\)/\1="\2"/p' ${TET_CONFIG:?}`

# if a TS_ENV_FILE has been defined, read it in
if test ! -z "$TS_ENV_FILE"
then
	if test -r $TS_ENV_FILE
	then
		. $TS_ENV_FILE
	else
		echo "$0: can't read environment file $TS_ENV_FILE" 1>&2
		exit 1
	fi
fi

TS_CMD_ARGS=
eval `sed -n 's/#.*//
	/^[ 	]*\$/d
	/^TS_CMD_ARGS=/s/\([^=]*\)=\(.*\)/\1="\2"/p' ${TET_CONFIG:?}`

TS_DEBUG_TOOL=
eval `sed -n 's/#.*//
	/^[ 	]*\$/d
	/^TS_DEBUG_TOOL=/s/\([^=]*\)=\(.*\)/\1="\2"/p' ${TET_CONFIG:?}`

# finally, exec the test case

if test -z $TS_DEBUG_TOOL
then
	exec "$@" "$TS_CMD_ARGS" 
else
	exec "$TS_DEBUG_TOOL" "$@" "$TS_CMD_ARGS"
fi