Build libcec for Docker image (#5230)

* Build libcec for Docker image

* Update development dockerfile as well

* Dynamically load python paths for current version

script/build_libcec

@@ -0,0 +1,55 @@
+#!/bin/sh
+# Sets up and builds libcec to be used with Home Assistant.
+# Dependencies that need to be installed:
+# apt-get install cmake libudev-dev libxrandr-dev python-dev swig
+
+# Stop on errors
+set -e
+
+# Load required information about the current python environment
+PYTHON_LIBDIR=$(python -c 'from distutils import sysconfig; print(sysconfig.get_config_var("LIBDIR"))')
+PYTHON_LDLIBRARY=$(python -c 'from distutils import sysconfig; print(sysconfig.get_config_var("LDLIBRARY"))')
+PYTHON_LIBRARY="${PYTHON_LIBDIR}/${PYTHON_LDLIBRARY}"
+PYTHON_INCLUDE_DIR=$(python -c 'from distutils import sysconfig; print(sysconfig.get_python_inc())')
+PYTHON_SITE_DIR=$(python -c 'from distutils import sysconfig; print(sysconfig.get_python_lib(prefix=""))')
+
+cd "$(dirname "$0")/.."
+mkdir -p build && cd build
+
+if [ ! -d libcec ]; then
+  git clone --branch release --depth 1 https://github.com/Pulse-Eight/libcec.git
+fi
+
+cd libcec
+git checkout release
+git pull
+git submodule update --init src/platform
+
+# Build libcec platform libs
+(
+    mkdir -p src/platform/build
+    cd src/platform/build
+    cmake ..
+    make
+    make install
+)
+
+# Fix upstream install hardcoded Debian path.
+# See: https://github.com/Pulse-Eight/libcec/issues/288
+sed -i \
+    -e '/DESTINATION/s:lib/python${PYTHON_VERSION}/dist-packages:${PYTHON_SITE_DIR}:' \
+    src/libcec/cmake/CheckPlatformSupport.cmake
+
+# Build libcec
+(
+    mkdir -p build && cd build
+
+    cmake \
+        -DPYTHON_LIBRARY="${PYTHON_LIBRARY}" \
+        -DPYTHON_INCLUDE_DIR="${PYTHON_INCLUDE_DIR}" \
+        -DPYTHON_SITE_DIR="${PYTHON_SITE_DIR}" \
+        ..
+    make
+    make install
+    ldconfig
+)