backend: add packaging scripts for iOS

backend/tools/README.md

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+## Backend tools
+
+This folder contains a few helper scripts meant to automatize some tasks such as packaging.
+
+### package_backend_framework
+
+This script makes a fat binary out of the `backend.framework` iOS framework, containing
+architectures for iOS and those for the iOS simulator. It requires the builds for the
+`ios` and `ios_simulator` targets to have completed successfully.
+
+It can therefore be run from a macOS system with the following commands:
+
+
+```
+make BUILD_BACKEND=YES
+make BUILD_BACKEND=YES ios
+make BUILD_BACKEND=YES ios_simulator
+bash package_backend_framework.bash
+```
+
+The resulting fat binary will be generated in `./build/fat_bin/`.
+
+### push_backend_framework_to_s3
+
+This script pushes the `dronecode-backend.zip` archive generated by _package_backend_framework.bash_
+to amazon s3, under the name `dronecode-backend-latest.zip`.
+
+It requires the `awscli` binary, that can be installed from homebrew:
+
+```
+brew install awscli
+```
+
+Documentation about the s3 commands can be found [here](https://docs.aws.amazon.com/cli/latest/reference/s3/).
+
+Obviously, the script requires the backend fat binary to be built, meaning the following commands:
+
+```
+make BUILD_BACKEND=YES
+make BUILD_BACKEND=YES ios
+make BUILD_BACKEND=YES ios_simulator
+bash package_backend_framework.bash
+bash push_backend_framework_to_s3.bash
+```

backend/tools/package_backend_framework.bash

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+#!/bin/bash
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+IOS_BACKEND_DIR=${SCRIPT_DIR}/../../build/ios/backend/src
+IOS_SIM_BACKEND_DIR=${SCRIPT_DIR}/../../build/ios_simulator/backend/src
+FAT_BIN_DIR=${SCRIPT_DIR}/../../build/fat_bin
+
+mkdir -p ${FAT_BIN_DIR}
+
+if [ -d ${FAT_BIN_DIR}/backend.framework ]; then
+    echo "${FAT_BIN_DIR}/backend.framework already exists! Aborting..."
+    exit 1
+fi
+
+if [ -f ${FAT_BIN_DIR}/dronecode-backend.zip ]; then
+    echo "${FAT_BIN_DIR}/dronecode-backend.zip already exists! Aborting..."
+    exit 1
+fi
+
+cp -r ${IOS_BACKEND_DIR}/backend.framework ${FAT_BIN_DIR}
+lipo ${IOS_BACKEND_DIR}/backend.framework/backend ${IOS_SIM_BACKEND_DIR}/backend.framework/backend -create -output ${FAT_BIN_DIR}/backend.framework/backend
+
+cd ${FAT_BIN_DIR}
+zip -9 -r dronecode-backend.zip backend.framework

backend/tools/push_backend_framework_to_s3.bash

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+#!/bin/bash
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+FAT_BIN_DIR=${SCRIPT_DIR}/../../build/fat_bin
+
+aws s3 cp ${FAT_BIN_DIR}/dronecode-backend.zip s3://dronecode-sdk/dronecode-backend-latest.zip
+aws s3api put-object-acl --bucket dronecode-sdk --key dronecode-backend-latest.zip --acl public-read