Split up library builds into individual builder stages to preserve layer cache

Dockerfile

@@ -1,149 +1,186 @@
 ARG BUILD_FROM
-FROM ${BUILD_FROM}
-
-ARG \
-    BUILD_ARCH \
-    QEMU_CPU \
-    SSOCR_VERSION \
-    LIBCEC_VERSION \
-    PICOTTS_HASH \
-    TELLDUS_COMMIT
-
-##
-# Install component packages
+####
+## Builder stage for ssocr, installs to /opt/ssocr
+FROM ${BUILD_FROM} AS ssocr-builder
+ARG SSOCR_VERSION
+ARG BUILD_FROM
+WORKDIR /tmp/
+SHELL ["/bin/ash", "-o", "pipefail", "-c"]
 RUN \
-    apk add --no-cache \
-        bluez \
-        bluez-deprecated \
-        bluez-libs \
-        curl \
-        eudev-libs \
-        ffmpeg \
-        iperf3 \
-        git \
-        grep \
-        hwdata-usb \
-        libgpiod \
-        libturbojpeg \
-        libpulse \
-        libzbar \
-        mariadb-connector-c \
-        net-tools \
-        nmap \
-        openssh-client \
-        pianobar \
-        pulseaudio-alsa \
-        socat
+    --mount=type=cache,target=/etc/apk/cache,sharing=locked,id=apk-cache-${BUILD_FROM} \
+    apk add \
+        build-base \
+        imlib2-dev
+RUN mkdir /opt/ssocr /tmp/ssocr \
+    && curl --silent --fail --location "https://github.com/auerswal/ssocr/archive/refs/tags/v${SSOCR_VERSION}.tar.gz" \
+            | tar zxv -C /tmp/ssocr --strip-components 1 \
+    && cd /tmp/ssocr \
+    && make -j"$(nproc)" \
+    && make PREFIX=/opt/ssocr install \
+    && rm -rf /tmp/ssocr
+
 
 ####
-## Install pip module for component/homeassistant
-COPY requirements.txt /usr/src/
+## Install pip module for component/homeassistant. Installs to /root/.local
+FROM ${BUILD_FROM} AS pip-install-builder
+ARG BUILD_FROM
+WORKDIR /tmp/
+COPY requirements.txt /tmp/requirements.txt
 RUN \
-    pip3 install --only-binary=:all: \
-        -r /usr/src/requirements.txt \
-    && rm -f /usr/src/requirements.txt
+    --mount=type=cache,target=/root/.cache/pip,sharing=locked,id=pip-builder-${BUILD_FROM} \
+    pip3 install --user --only-binary=:all: \
+        -r /tmp/requirements.txt
 
-####
-## Build library
-WORKDIR /usr/src/
 
-# ssocr
+####
+## Builder stage for libcec, installs to /opt/libcec
+FROM ${BUILD_FROM} AS libcec-builder
+ARG LIBCEC_VERSION
+ARG BUILD_FROM
+WORKDIR /tmp/
+COPY patches/libcec-fix-null-return.patch /tmp/
+COPY patches/libcec-python313.patch /tmp/
 RUN \
-    apk add --no-cache \
-        imlib2 \
-    && apk add --no-cache --virtual .build-dependencies \
-        build-base \
-        imlib2-dev \
-    && git clone --depth 1 -b "v${SSOCR_VERSION}" https://github.com/auerswal/ssocr \
-    && cd ssocr \
-    && make -j"$(nproc)" \
-    && make install \
-    && apk del .build-dependencies \
-    && rm -rf /usr/src/ssocr
-
-# libcec
-COPY patches/libcec-fix-null-return.patch /usr/src/
-COPY patches/libcec-python313.patch /usr/src/
-RUN apk add --no-cache \
-        eudev-libs \
-        p8-platform \
-    && apk add --no-cache --virtual .build-dependencies \
+    --mount=type=cache,target=/etc/apk/cache,sharing=locked,id=apk-cache-${BUILD_FROM} \
+    apk add  \
         build-base \
         cmake \
         eudev-dev \
-        swig \
-        p8-platform-dev \
+        git \
         linux-headers \
+        p8-platform-dev \
+        swig
+RUN python_version=$(python -c "import sys; print(f'{sys.version_info.major}.{sys.version_info.minor}')") \
     && git clone --depth 1 -b "libcec-${LIBCEC_VERSION}" https://github.com/Pulse-Eight/libcec \
     && cd libcec \
     && git apply ../libcec-fix-null-return.patch \
     && git apply ../libcec-python313.patch \
     && mkdir build \
     && cd build \
-    && cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr/local \
-        -DPYTHON_LIBRARY="/usr/local/lib/libpython3.13.so" \
-        -DPYTHON_INCLUDE_DIR="/usr/local/include/python3.13" \
+    && cmake -DCMAKE_INSTALL_PREFIX:PATH=/opt/libcec \
+        -DPYTHON_LIBRARY="/usr/local/lib/libpython${python_version}.so" \
+        -DPYTHON_INCLUDE_DIR="/usr/local/include/python${python_version}" \
         -DHAVE_LINUX_API=1 \
         .. \
     && make -j"$(nproc)" \
-    && make install \
-    && echo "cec" > "/usr/local/lib/python3.13/site-packages/cec.pth" \
-    && apk del .build-dependencies \
-    && rm -rf \
-        /usr/src/libcec \
-        /usr/src/libcec-fix-null-return.patch \
-        /usr/src/libcec-python313.patch
+    && make install
 
+
+# Build stage for PicoTTS, installs to /opt/picotts
 # PicoTTS - it has no specific version - commit should be taken from build.json
-RUN apk add --no-cache \
-        popt \
-    && apk add --no-cache --virtual .build-dependencies \
-       automake \
+FROM ${BUILD_FROM} AS picotts-builder
+ARG PICOTTS_HASH
+ARG BUILD_FROM
+WORKDIR /tmp/
+RUN \
+    --mount=type=cache,target=/etc/apk/cache,sharing=locked,id=apk-cache-${BUILD_FROM} \
+    apk add \
        autoconf \
-       libtool \
-       popt-dev \
+       automake \
        build-base \
-    && git clone https://github.com/naggety/picotts.git pico \
+       git \
+       libtool \
+       popt-dev
+RUN git clone https://github.com/naggety/picotts.git pico \
     && cd pico/pico \
     && git reset --hard "${PICOTTS_HASH}" \
     && ./autogen.sh \
+    && mkdir /opt/picotts \
     && ./configure \
          --disable-static \
+         --prefix=/opt/picotts \
     && make \
-    && make install \
-    && apk del .build-dependencies \
-    && rm -rf /usr/src/pico
+    && make install
 
-# Telldus
-COPY patches/telldus-fix-gcc-11-issues.patch /usr/src/
-COPY patches/telldus-fix-alpine-3-17-issues.patch /usr/src/
+
+# Build stage for Telldus, installs to /opt/telldus
+FROM ${BUILD_FROM} AS telldus-builder
+ARG TELLDUS_COMMIT
+ARG BUILD_FROM
+WORKDIR /tmp/
+COPY patches/telldus-fix-gcc-11-issues.patch /tmp/
+COPY patches/telldus-fix-alpine-3-17-issues.patch /tmp/
 RUN \
-    apk add --no-cache \
-        confuse \
-        libftdi1 \
-    && apk add --no-cache --virtual .build-dependencies \
+    --mount=type=cache,target=/etc/apk/cache,sharing=locked,id=apk-cache-${BUILD_FROM} \
+    apk add \
         argp-standalone \
         build-base \
         cmake \
         confuse-dev \
         doxygen \
-        libftdi1-dev \
-    && git clone https://github.com/telldus/telldus \
+        git \
+        libftdi1-dev
+RUN git clone https://github.com/telldus/telldus \
     && cd telldus \
     && git reset --hard "${TELLDUS_COMMIT}" \
     && git apply ../telldus-fix-gcc-11-issues.patch \
     && git apply ../telldus-fix-alpine-3-17-issues.patch \
     && cd telldus-core \
+    && mkdir /opt/telldus \
     && cmake . -DBUILD_LIBTELLDUS-CORE=ON \
         -DBUILD_TDADMIN=OFF -DBUILD_TDTOOL=OFF -DGENERATE_MAN=OFF \
         -DFORCE_COMPILE_FROM_TRUNK=ON \
+        -DCMAKE_INSTALL_PREFIX:PATH=/opt/telldus \
     && make -j"$(nproc)" \
-    && make install \
-    && apk del .build-dependencies \
-    && rm -rf \
-        /usr/src/telldus \
-        /usr/src/telldus-fix-gcc-11-issues.patch \
-        /usr/src/telldus-fix-alpine-3-17-issues.patch
+    && make install
+
+
+FROM ${BUILD_FROM}
+
+ARG BUILD_ARCH
+ARG QEMU_CPU
+ARG BUILD_FROM
+
+##
+# Install component packages
+RUN \
+    --mount=type=cache,target=/etc/apk/cache,sharing=locked,id=apk-cache-${BUILD_FROM} \
+    apk add \
+        bluez \
+        bluez-deprecated \
+        bluez-libs \
+        confuse \
+        curl \
+        eudev-libs \
+        ffmpeg \
+        grep \
+        hwdata-usb \
+        imlib2 \
+        iperf3 \
+        libftdi1 \
+        libgpiod \
+        libpulse \
+        libturbojpeg \
+        libzbar \
+        mariadb-connector-c \
+        net-tools \
+        nmap \
+        openssh-client \
+        p8-platform \
+        pianobar \
+        popt \
+        pulseaudio-alsa \
+        socat
+
+WORKDIR /usr/src/
+
+####
+## Copy from pip builder
+COPY --link --from=pip-install-builder /root/.local/ /root/.local/
+
+# Copy from ssocr builder
+COPY --link --from=ssocr-builder /opt/ssocr/ /usr/local/
+
+# Copy from libcec builder
+COPY --link --from=libcec-builder /opt/libcec/ /usr/local/
+RUN python_version=$(python -c "import sys; print(f'{sys.version_info.major}.{sys.version_info.minor}')") \
+    && echo "cec" > "/usr/local/lib/python${python_version}/site-packages/cec.pth"
+
+# Copy from picotts builder
+COPY --link --from=picotts-builder /opt/picotts/ /usr/local/
+
+# Copy from Telldus builder
+COPY --link --from=telldus-builder /opt/telldus/ /usr/local/
 
 ###
 # Base S6-Overlay