setenv

#
# eChronos Real-Time Operating System
# Copyright (C) 2015  National ICT Australia Limited (NICTA), ABN 62 102 206 173.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, version 3, provided that these additional
# terms apply under section 7:
#
#   No right, title or interest in or to any trade mark, service mark, logo or
#   trade name of of National ICT Australia Limited, ABN 62 102 206 173
#   ("NICTA") or its licensors is granted. Modified versions of the Program
#   must be plainly marked as such, and must not be distributed using
#   "eChronos" as a trade mark or product name, or misrepresented as being the
#   original Program.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# @TAG(NICTA_AGPL)
#

#
# This shell script should be sourced to set up a shell environment for working on the RTOS.
#
# Usage:
#
# % . ./setenv
#
# Later 'unsetenv' can be used to restore the environment.
#
unsetenv () {
    if test -n ""$OLD_PATH; then
        export PATH=$OLD_PATH
        unset OLD_PATH
    else
        # This shouldn't be possible, but just in case
        echo "Environment not set"
    fi;
    # Remove unsetenv from the environment since it is no longer
    # required.
    unset -f unsetenv
}

setenv () {
    if test -n ""$OLD_PATH; then
        echo "Environment already set."
    elif test ! -f setenv; then
        echo "Don't appear to be source from the correct directory."
    else
        OLD_PATH=$PATH
        if test $(uname) = Darwin; then
            PATH=$(pwd)/core/tools/x86_64-apple-darwin/bin:$PATH
        elif test $(uname) = Linux; then
            PATH=$(pwd)/core/tools/x86_64-unknown-linux-gnu/bin:$PATH
            PATH=$(pwd)/core/tools/gcc-4.8.2-Ee500v2-eabispe/bin:$PATH
        else
            echo "Unknown host operating system"
        fi

        export PATH=$PATH
    fi;
}

setenv
# No need to call setenv twice, so remove it form the environment.
unset -f setenv