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nerves_system_br

1.5.4
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Nerves System BR - Buildroot based build platform for Nerves Systems

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nerves_system_br nerves-env.sh
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nerves-env.sh 

#!/usr/bin/env bash



# Source this script to setup your environment to cross-compile

# and build Erlang apps for this Nerves build.



# "readlink -f" implementation for BSD

# This code was extracted from the Elixir shell scripts

readlink_f () {

    cd "$(dirname "$1")" > /dev/null

    filename="$(basename "$1")"

    if [ -h "$filename" ]; then

        readlink_f "$(readlink "$filename")"

    else

        echo "`pwd -P`/$filename"

    fi

}



# If the script is called with the -get-nerves-root flag it just returns the

# Nerves system directory. This is so that other shells can execute the script

# without needing to implement the equivalent of $BASH_SOURCE for every shell.

for arg in $*

do

    if [ $arg = "-get-nerves-root" ];

    then

        echo $(dirname $(readlink_f "${BASH_SOURCE[0]}"))

        exit 0

    fi

done



if [ "$BASH_SOURCE" = "" ]; then

    GET_NR_COMMAND="$0 $@ -get-nerves-root"

    SCRIPT_DIR=$(bash -c "$GET_NR_COMMAND")

else

    SCRIPT_DIR=$(dirname $(readlink_f "${BASH_SOURCE[0]}"))

fi



# Detect if this script has been run directly rather than sourced, since

# that won't work.

if [[ "$SHELL" = "/bin/bash" ]]; then

    if [ "$0" != "bash" -a "$0" != "-bash" -a "$0" != "/bin/bash" ]; then

        echo ERROR: This scripted should be sourced from bash:

        echo

        echo source $BASH_SOURCE

        echo

        exit 1

    fi

#elif [[ "$SHELL" = "/bin/zsh" ]]; then

# TODO: Figure out how to detect this error from other shells.

fi



# Determine the location of the NERVES_SYSTEM directory. This script is

# either being sourced from the directory or from the base of nerves_system_br.

# If it's the latter, then point the helper script at the appropriate place.

if [ -e "$SCRIPT_DIR/.config" ]; then

    NERVES_SYSTEM=$SCRIPT_DIR

elif [ -e "$SCRIPT_DIR/buildroot/output" ]; then

    NERVES_SYSTEM=$SCRIPT_DIR/buildroot/output

else

    echo "ERROR: Can't find Nerves system directory. Has Nerves been built?"

    echo " If sourcing from the nerves_system_br directory, then the build products"

    echo " aren't in the default location. The new way is to source nerves-env.sh"

    echo " from nerves_system_br's output directory."

    return 1

fi



source $SCRIPT_DIR/scripts/nerves-env-helper.sh $NERVES_SYSTEM

if [ $? != 0 ]; then

    echo "Shell environment NOT updated for Nerves!"

    return 1

else

    # Found it. Print out some useful information so that the user can

    # easily figure out whether the wrong nerves installation was used.

    NERVES_DEFCONFIG=$(grep BR2_DEFCONFIG= $NERVES_SYSTEM/.config | sed -e 's/BR2_DEFCONFIG="\(.*\)"/\1/')

    GCC_VERSION=$($CROSSCOMPILE-gcc --version | head -1)



    echo "Shell environment updated for Nerves"

    echo

    echo "Nerves configuration: $NERVES_DEFCONFIG"

    echo "Cross-compiler: $GCC_VERSION"

    echo "Erlang/OTP release on target: $NERVES_TARGET_ERL_VER"

    if [ -n "$(which elixir)" ]; then

        NERVES_ELIXIR_VERSION=$(elixir -v | grep lixir | cut -d' ' -f2-)

        echo "Elixir version (from path): $NERVES_ELIXIR_VERSION"

    else

        echo "WARNING: Elixir not found on host"

    fi

fi