Setup build automation script and CI workflow

.github/workflows/build-examples.yml

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+name: Build Examples
+on:
+  workflow_dispatch:
+  pull_request:
+jobs:
+  build-mock:
+    runs-on: ubuntu-latest
+    container: mbedos/mbed-os-env:latest
+    steps:
+      # Checkout the repo and download it to the runner
+      - name: Checkout
+        uses: actions/checkout@v2
+      # Install the venv module 
+      - name: Install dependencies
+        run: |
+          apt-get update -y 
+          apt-get install -y python3-venv
+      # Run the fota build tool with mock as the option
+      - name: Build example
+        run: ./scripts/fota.sh -e=mock
+
+  build-mcuboot:
+    runs-on: ubuntu-latest
+    container: mbedos/mbed-os-env:latest
+    steps:
+      # Checkout the repo and download it to the runner
+      - name: Checkout
+        uses: actions/checkout@v2
+      # jq is a command-line JSON processor
+      - name: Install dependencies
+        run: | 
+          apt-get update -y
+          apt-get install -y jq python3-venv
+      # Pipe "yes" into the script to select the appropriate option
+      # More information about this in the documentation
+      # Run the fota build tool with mcuboot as the option
+      - name: Build example
+        run: yes | ./scripts/fota.sh -e=mcuboot

.gitignore

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+# macOS Desktop Services Store
+.DS_Store 
+
+# Virtual environment directory
+venv/
+
+# IDE-specific directories
+.vscode/
+.idea/
+
+# Example application dependencies
+mcuboot/target/application/mbed-os-experimental-ble-services/
+mcuboot/target/application/mbed-os/
+mcuboot/target/application/mcuboot/
+mcuboot/target/bootloader/dist/
+mcuboot/target/bootloader/imgtool.egg-info/
+mcuboot/target/bootloader/mbed-os/
+mcuboot/target/bootloader/mcuboot/
+mock/target/mbed-os-experimental-ble-services/
+mock/target/mbed-os/
+
+# CMake build directory
+**/cmake_build
+
+# Example application build files
+mcuboot/target/application/BUILD/
+mcuboot/target/bootloader/application.hex
+mcuboot/target/bootloader/build/
+mcuboot/target/bootloader/merged.hex
+mcuboot/target/bootloader/signed_application.hex
+mcuboot/target/bootloader/signed_update.bin
+mcuboot/target/bootloader/signed_update.hex
+mcuboot/target/bootloader/signing-keys.pem
+mcuboot/target/bootloader/signing_keys.c
+
+# .mbed files
+mcuboot/target/application/.mbed
+mcuboot/target/bootloader/.mbed

requirements.txt

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+bleak==0.12.1
+cmake==3.20.5
+mbed-cli==1.10.5
+mbed-tools==7.28.1
+mercurial==5.8
+ninja==1.10.0.post2

scripts/fota.sh

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+#!/bin/bash
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Author's Note:
+# The fota cli tool is used to setup and build the ble fota examples in this repository. The tool takes in as
+# arguments the example, target board, mount point of the target board, and toolchain. Note that if the mount point
+# is not provided (it could be the case that an end-user is trying to build without the board connected), then the
+# target binary is not flashed. In the case of the MCUboot example, the "factory firmware" is saved and would require
+# manual transfer when the board is indeed connected. In either case, the demonstration step would be the only part
+# that requires manual intervention.
+#
+# Important: The tool assumes the target board and toolchain unless otherwise specified by the end-user. However,
+#            currently, the only board and toolchain supported are NRF52840_DK and GCC_ARM respectively.
+
+set -e
+trap 'cleanup $?' SIGINT SIGTERM ERR EXIT
+
+source scripts/utils.sh
+source scripts/mock.sh
+source scripts/mcuboot.sh
+
+# Display a neatly formatted message on how to use this tool
+usage () {
+  cat <<EOF
+Usage: $(basename "${BASH_SOURCE[0]}") [options]
+
+  A simple cli tool to automate the setup and build process for Bluetooth-LE
+  Firmware Over the Air (FOTA) examples
+
+Options:
+  -e=, --example=TEXT             The example you are trying to setup and build.
+                                  [default: mock]
+  -t=, --toolchain=[GCC_ARM|ARM]  The toolchain you are using to build your app.
+                                  [default: GCC_ARM]
+  -b=, --board=TEXT               A build target for an Mbed-enabled device.
+                                  [default: NRF52840_DK]
+  -m=, --mount=TEXT               Path to the mount point of the target board.
+  -c, --clean                     Clean the example builds and environment
+  -h, --help                      Print this message and exit
+
+Note:
+  For now, only the NRF52840_DK board and GCC_ARM toolchain are supported. Also,
+  if a mount point isn't provided, then the target binary is not flashed.
+EOF
+  exit
+}
+
+# This function would clean up the example builds and generated files
+clean () {
+  say message "Cleaning builds and generated files..."
+
+  rm -rf "$root/venv"
+
+  # Clean example-specific files and folders
+  mock_clean "$root"
+  mcuboot_clean "$root"
+
+  say success "All neat and tidy now" && exit
+}
+
+# Parses the options specified by the end-user and either assigns the corresponding variable or calls a function and
+# exits (i.e. in the case of help and clean). If the option is unrecognised, the function returns 1, which triggers
+# a fail that exits the tools and displays an error on stderr.
+parse_options () {
+  for i in "$@"; do
+    case $i in
+      -e=*|--example=*)   example="${i#*=}"   ; shift  ;;
+      -t=*|--toolchain=*) toolchain="${i#*=}" ; shift  ;;
+      -b=*|--board=*)     board="${i#*=}"     ; shift  ;;
+      -m=*|--mount=*)     mount="${i#*=}"     ; shift  ;;
+      -c|--clean)         clean               ;;
+      -h|--help)          usage               ;;
+      *)                  return 1            ;;
+    esac
+  done
+}
+
+# Check that the provided target board mount point is valid. If the mount point is not provided, display a short message
+# indicating that binaries will have to be flashed manually.
+valid_mount () {
+  if [[ -z $mount ]]; then
+    say note "Mount point not provided - binaries will not be flashed."
+    skip=1
+  else
+    [ -d "$mount" ] || fail "Mount point invalid" \
+                                 "Please check the path and if the board is connected" \
+                                 "Tip: Use mbed-ls to identify the mount point path"
+  fi
+}
+
+# Checks if the example is either mock or mcuboot. If more examples, are added in the future, this function would have
+# to be modified accordingly.
+valid_example () {
+  case $example in
+    mock|mcuboot) ;;
+    *) fail "Invalid example" "Supported examples - [mock|mcuboot]" ;;
+  esac
+}
+
+# Checks if the board is NRF52840_DK as it's currently the only supported board. This function will have to be modified
+# when DISCO_L475VG_IOT01A (and maybe other boards) are supported at a later point.
+valid_board () {
+  case $board in
+    NRF52840_DK) ;;
+    *) fail "Unsupported board" "The only supported board is NRF52840_DK"
+  esac
+}
+
+# Checks if the toolchain is GCC_ARM as it's the only one supported. The ARM toolchain may be supported in the future.
+valid_toolchain () {
+  case $toolchain in
+    GCC_ARM) ;;
+    *) fail "Unsupported toolchain" "The only supported toolchain is GCC_ARM"
+  esac
+}
+
+# A series of checks to make sure that the program options are valid
+check_usage () {
+  valid_mount
+  valid_example
+  valid_board
+  valid_toolchain
+}
+
+# Setups up the main virtual environment and activates it
+setup_virtualenv () {
+  if [[ -d venv ]]; then
+    say message "Using existing virtual environment venv..."
+  else
+    say message "Creating virtual environment..."
+
+    # Create the venv directory and setup the virtual environment
+    # shellcheck disable=SC2015
+    mkdir venv && python3 -m venv venv \
+      || fail "Virtual environment creation failed!" "Tip: Check your python installation!"
+  fi
+  source venv/bin/activate
+  say success "Virtual environment activated"
+}
+
+# Installs the required python dependencies silently and notify if there's any issue in the installation.
+install_requirements () {
+  say message "Installing/updating requirements silently..."
+  # shellcheck disable=SC2015
+  pip install -q --upgrade pip && pip install -q -r "$root/requirements.txt" \
+    || fail "Unable to install requirements!" "Please take a look at requirements.txt"
+  say success "General requirements installed/updated"
+}
+
+# Call the build functions corresponding to the selected example
+# Pre: The example is valid and so are all other arguments.
+build_example () {
+  args=("$toolchain" "$board" "$mount" "$skip" "$root")
+  case $example in
+    mock)    mock_build "${args[@]}"    ;;
+    mcuboot) mcuboot_build "${args[@]}" ;;
+  esac
+}
+
+# Cleanup routine that runs when the program exits (either successfully or abruptly)
+cleanup () {
+  # If unsuccessful termination, then clean the build
+  if [[ "$1" -eq 1 ]]; then clean; fi
+}
+
+#-----------------------------------------------------------------------------------------------------------------------
+# Main Program
+#-----------------------------------------------------------------------------------------------------------------------
+main () {
+  # Default Options:
+  example="mock"
+  toolchain="GCC_ARM"
+  board="NRF52840_DK"
+  skip=0               # Skip the binary flashing if mount point is missing - Default: false
+
+  # Root directory of repository
+  root=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." &>/dev/null && pwd -P)
+
+  setup_formatting
+  parse_options "$@" || fail "Unrecognised option" "Please use -h or --help for usage"
+
+  check_usage
+  setup_virtualenv
+  install_requirements
+  build_example
+}
+
+main "$@"
+exit