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nerves_system_br

1.21.0
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Nerves System BR - Buildroot based build platform for Nerves Systems

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nerves_system_br scripts rel2fw.sh
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scripts/rel2fw.sh 

#!/usr/bin/env bash

set -e



BASE_DIR=$(pwd)

PROJECT_DIR=$(basename "$BASE_DIR")



SCRIPT_NAME=$0



# Check that we have everything that we need

[[ -z "$NERVES_SYSTEM" ]] && { echo "$SCRIPT_NAME: Source nerves-env.sh and try again."; exit 1; }



# Initialize this script's temporary directory

TMP_DIR=$BASE_DIR/_build/_nerves-tmp

rm -fr "$TMP_DIR"

mkdir -p "$TMP_DIR"

function cleanup {

  rm -fr "$TMP_DIR"

}

trap cleanup EXIT



usage() {

    echo "Usage: $SCRIPT_NAME [options] <Release directory>"

    echo

    echo "Options:"

    echo "  -a <path to rootfs overlay> May be supplied multiple times."

    echo "  -c <fwup.conf>             Default is $NERVES_SDK_IMAGES/fwup.conf"

    echo "  -f <firmware output file>  Default is $PROJECT_DIR.fw"

    echo "  -o <image output file>     Default is $PROJECT_DIR.img"

    echo "  -p <file priorities>       The ordering of files in the rootfs (may be specified more than once)"

    echo

    echo "Barring errors, the firmware file is always created. The raw image is only"

    echo "created if specified."

    echo



    echo "Example:"

    echo "$SCRIPT_NAME -f $PROJECT_DIR.fw -o $PROJECT_DIR.img _rel"

}



# Create a base priority file

#

# Seed it with erlinit being the highest priority since we know those

# files are guaranteed to be in the filesystem and accessed first on

# boot.

SQUASHFS_PRIORITIES="$TMP_DIR/squashfs.priority"

cat > "$SQUASHFS_PRIORITIES" <<END

sbin/init 32764

etc/erlinit.config 32763

END



while getopts "a:c:f:o:p:" opt; do

    case $opt in

        a)

            ROOTFS_OVERLAYS="$ROOTFS_OVERLAYS $OPTARG"

            ;;

        c)

            FWUP_CONFIG="$OPTARG"

            ;;

        f)

            FW_FILENAME="$OPTARG"

            ;;

        o)

            IMG_FILENAME="$OPTARG"

            ;;

        p)

            # Append priorities to the master list

            cat "$OPTARG" >> "$SQUASHFS_PRIORITIES"

            ;;

        \?)

            echo "$SCRIPT_NAME: ERROR: Invalid option: -$OPTARG"

            usage

            exit 1

            ;;

        :)

            echo "$SCRIPT_NAME: ERROR: Option -$OPTARG requires an argument."

            usage

            exit 1

            ;;

    esac

done

shift $((OPTIND-1))



if [[ $# -lt 1 ]]; then

    echo "$SCRIPT_NAME: ERROR: Expecting release directory"

    usage

    exit 1

fi



RELEASE_DIR=$1





# If the toolchain contains a pre-built version of fwup,

# use it; otherwise look for one in the path.

FWUP=$NERVES_TOOLCHAIN/usr/bin/fwup

[[ -e "$FWUP" ]] || FWUP=$(command -v fwup || echo "/usr/bin/fwup")

if [[ ! -e "$FWUP" ]]; then

    echo "$SCRIPT_NAME: ERROR: Please install fwup first"

    echo

    echo "See https://github.com/fhunleth/fwup"

    exit 1

fi



# Check that mksquashfs is in the path. It's needed by

# merge-squashfs.

MKSQUASHFS=$(command -v mksquashfs)

if [[ ! -e "$MKSQUASHFS" ]]; then

    echo "$SCRIPT_NAME: ERROR: Please install mksquashfs first"

    echo

    echo "For example:"

    echo "   sudo apt-get install squashfs-tools"

    echo "   brew install squashfs"

    exit 1

fi



# Fill in defaults

[[ -z "$FW_FILENAME" ]] && FW_FILENAME=${PROJECT_DIR}.fw

[[ -z "$FWUP_CONFIG" ]] && FWUP_CONFIG=$NERVES_SDK_IMAGES/fwup.conf



# Check that the release directory exists

if [[ ! -d "$RELEASE_DIR" ]]; then

    echo "$SCRIPT_NAME: ERROR: Missing Erlang release directory: ($RELEASE_DIR)"

    exit 1

fi

if [[ ! -d "$RELEASE_DIR/lib" || ! -d "$RELEASE_DIR/releases" ]]; then

    echo "$SCRIPT_NAME: ERROR: Expecting '$RELEASE_DIR' to contain 'lib' and 'releases' subdirectories"

    exit 1

fi



# Make sure that the firmware output directories are there.

mkdir -p "$(dirname "$FW_FILENAME")"



# Update the file system bundle

echo "Updating base firmware image with Erlang release..."



# Construct the proper path for the Erlang/OTP release

mkdir -p "$TMP_DIR/rootfs_overlay/srv/erlang"

cp -R "$RELEASE_DIR/." "$TMP_DIR/rootfs_overlay/srv/erlang"



# Clean up the Erlang release of all the files that we don't need.

"$NERVES_SYSTEM/scripts/scrub-otp-release.sh" "$TMP_DIR/rootfs_overlay/srv/erlang"



# Copy over any rootfs overlays from the user

# IMPORTANT: This must be the final step before the merge so that the user can

#            override anything.

if [[ "$ROOTFS_OVERLAYS" ]]; then

    for OVERLAY in $ROOTFS_OVERLAYS; do

      if [[ -d $OVERLAY ]]; then

          echo "Copying rootfs_overlay: $OVERLAY"

          cp -Rf "$OVERLAY/." "$TMP_DIR/rootfs_overlay"

      elif [[ -n "$OVERLAY" ]]; then

          echo "rootfs_overlay: $OVERLAY does not exist!"

          exit 1

      fi

    done

fi



# Merge the Erlang/OTP release onto the base image

"$NERVES_SYSTEM/scripts/merge-squashfs" "$NERVES_SDK_IMAGES/rootfs.squashfs" "$TMP_DIR/combined.squashfs" "$TMP_DIR/rootfs_overlay" "$SQUASHFS_PRIORITIES"



# Build the firmware image

echo "Building $FW_FILENAME..."

ROOTFS="$TMP_DIR/combined.squashfs" $FWUP -c -f "$FWUP_CONFIG" \

	-o "$FW_FILENAME"



if [[ -n "$IMG_FILENAME" ]]; then

    # Create the output directory - just in case

    mkdir -p "$(dirname "$IMG_FILENAME")"



    # Erase the image file in case it exists from a previous build.

    # We use fwup in "programming" mode to create the raw image so it expects there

    # the destination to exist (like an MMC device). This provides the minimum sized image.

    rm -f "$IMG_FILENAME"

    touch "$IMG_FILENAME"



    # Build the raw image for the bulk programmer

    echo "Building $IMG_FILENAME..."

    $FWUP -a -d "$IMG_FILENAME" -t complete -i "$FW_FILENAME"

fi