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nerves-env.sh
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nerves-env.sh
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#!/bin/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/')
NERVES_VERSION=$(grep NERVES_VERSION:= $NERVES_SYSTEM/nerves.mk | sed -e 's/NERVES_VERSION\:=\(.*\)/\1/')
NERVES_ELIXIR_VERSION_FILE=$(dirname $(readlink_f $(which iex)))/../VERSION
echo "Shell environment updated for Nerves"
echo
echo "Nerves version: $NERVES_VERSION"
echo "Nerves configuration: $NERVES_DEFCONFIG"
echo "Cross-compiler prefix: $(basename $CROSSCOMPILE)"
echo "Erlang/OTP release on target: $NERVES_TARGET_ERL_VER"
if [ -e $NERVES_ELIXIR_VERSION_FILE ]; then
echo "Elixir version: $(cat $NERVES_ELIXIR_VERSION_FILE)"
fi
fi