#!/bin/sh

# This script is used to setup the OE Build Envrionment
# Normally this is called as '. ./core-init-build-env <builddir>'

# On some shell, we can get the path of this script when sources. Otherwise we
# use the current directory as a fallback
if [ -n "$BASH_SOURCE" ]; then
    CORE_OS_ROOT=$(dirname "$BASH_SOURCE")
elif [ -n "$ZSH_NAME" ]; then
    CORE_OS_ROOT=$(dirname "$0")
else
    CORE_OS_ROOT="$(pwd)"
fi

# Get a non relative path to the root directory
CORE_OS_ROOT=$(readlink -f "${CORE_OS_ROOT}")

# Set the path to bitbake, openembedded-core and the template directory
BITBAKEDIR="${CORE_OS_ROOT}/bitbake"
OEROOT="${CORE_OS_ROOT}/layers/openembedded-core"
TEMPLATECONF="${CORE_OS_ROOT}/templates"

# Sanity checks

# This check detect if CORE_OS_ROOT is valid, by checking if the templates
# directory exists. Usefull has we use $(pwd) as a fallback method on some shell
if [ ! -d "$TEMPLATECONF" ]; then
    echo "Error: $TEMPLATECONF doesn't exist!" >&2
    echo "Please run this script in oe-init-build-env's directory." >&2
    return 1
fi

# This check detect if BITBAKEDIR exist. It's a simple way to check that we have
# fetched our git submodules
if [ ! -d "$BITBAKEDIR" ]; then
    echo "Error: $BITBAKEDIR doesn't exist!" >&2
    echo "Please ensure all git submodule are fetched." >&2
    return 1
fi

# Call the oe-init-build-env scripts of openembedded-core
. "${OEROOT}/oe-init-build-env" "${1:-$CORE_OS_ROOT/build}"

# Add the scripts directory of CoreOS to the path
# Make sure our paths are at the beginning of $PATH
for newpath in "${CORE_OS_ROOT}/scripts"; do
    # Remove any existences of $newpath from $PATH
    PATH=$(echo $PATH | sed -re "s#(^|:)$newpath(:|$)#\2#g;s#^:##")

    # Add $newpath to $PATH
    PATH="$newpath:$PATH"
done
unset newpath
export PATH