#!/usr/bin/env bash
# SPDX-FileCopyrightText: 2015 Frank Hunleth
# SPDX-FileCopyrightText: 2016 Greg Mefford
# SPDX-FileCopyrightText: 2016 JP Hastings-Spital
# SPDX-FileCopyrightText: 2019 Matt Ludwigs
#
# SPDX-License-Identifier: Apache-2.0
#

#
# This script creates a tarball with everything needed to build
# an application image on another system. It is useful to allow
# the parts that require Linux to be built separately from the
# parts that can be built on any system.
# It is intended to be called from Buildroot's Makefiles so that
# the environment is set up properly.
#
# Inputs:
#   $1 = the archive name (if not passed, we'll make up a name)
#   BASE_DIR = the build directory (aka, the future $NERVES_SYSTEM directory)
#   PWD = the buildroot directory
#
# Outputs:
#   Archive tarball
#

set -e

# The first parameter is the name of the archive to create. If it's not set
# we'll set it below.
ARCHIVE_NAME=$1
BR2_EXTERNAL_NERVES_PATH=$PWD/..

if [ -z "$ARCHIVE_NAME" ]; then
    echo "ERROR: Please specify an archive name"
    exit 1
fi

# Check the working directory
if [ ! -f "$PWD/package/pkg-generic.mk" ]; then
    echo "ERROR: mksystem.sh must be run from the buildroot directory"
    exit 1
fi

# Check BASE_DIR
if [ -z "$BASE_DIR" ]; then
    echo "ERROR: BASE_DIR undefined? Script should be called from Buildroot."
    exit 1
fi

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

WORK_DIR=$BASE_DIR/tmp-system
rm -fr "$WORK_DIR"
mkdir -p "$WORK_DIR/$ARCHIVE_NAME"

# Save the version to the archive in case we need it for debug
VERSION=$(cat ../VERSION)
echo "$VERSION" >"$WORK_DIR/$ARCHIVE_NAME/nerves-system.tag"

# Add some help text for the curious
cat << EOT > "$WORK_DIR/$ARCHIVE_NAME/README.md"
# Nerves system image

This is an automatically generated archive created by \`nerves_system_br\`. It is
useful for building embedded Elixir projects without worrying too much
about the cross-compiler and Linux parts. See http://nerves-project.org
for more information.

## Build information

Configuration: $NERVES_DEFCONFIG
nerves_system_br: $VERSION
EOT

# Copy common nerves shell scripts over
cp "$BR2_EXTERNAL_NERVES_PATH/nerves-env.sh" "$WORK_DIR/$ARCHIVE_NAME"
cp "$BR2_EXTERNAL_NERVES_PATH/nerves.mk" "$WORK_DIR/$ARCHIVE_NAME"
cp -R "$BR2_EXTERNAL_NERVES_PATH/scripts" "$WORK_DIR/$ARCHIVE_NAME"

# Copy the built configuration over
cp "$BASE_DIR/.config" "$WORK_DIR/$ARCHIVE_NAME"

# Copy the staging and images directories over
cp -R "$BASE_DIR/images" "$WORK_DIR/$ARCHIVE_NAME"
cp -HR "$BASE_DIR/staging" "$WORK_DIR/$ARCHIVE_NAME"

# Copy SBOM information if generated
if [[ -e "$BASE_DIR/pkg-stats.json" ]]; then
    cp "$BASE_DIR/pkg-stats.json" "$WORK_DIR/$ARCHIVE_NAME"
    cp "$BASE_DIR/pkg-stats.html" "$WORK_DIR/$ARCHIVE_NAME"
fi
if [[ -d "$BASE_DIR/legal-info" ]]; then
    # The legal-info is very large since it contains all source tarballs.
    # Don't include the source tarballs for now.
    cp -R "$BASE_DIR/legal-info" "$WORK_DIR/$ARCHIVE_NAME"
    rm -rf "$WORK_DIR/$ARCHIVE_NAME/legal-info/sources" "$WORK_DIR/$ARCHIVE_NAME/legal-info/host-sources"
fi

# Clean up extra files that were copied over and aren't needed
rm -f "$WORK_DIR/$ARCHIVE_NAME/images"/*.fw
rm -f "$WORK_DIR/$ARCHIVE_NAME/images/$ARCHIVE_NAME.img"

tar c -z -f "$BASE_DIR/$ARCHIVE_NAME.tar.gz" -C "$WORK_DIR" "$ARCHIVE_NAME"

rm -fr "$WORK_DIR"