Use python/requirements.txt to install dependencies.

Simplify pip cache management and make it working.

Author: sobomax

docker/Dockerfile.python_wheels

@@ -1,6 +1,10 @@
 # syntax=docker/dockerfile:1.7-labs
 
 ARG BASE_IMAGE="quay.io/pypa/manylinux_2_28:latest"
+ARG CACHE_IMAGE="scratch"
+
+FROM ${CACHE_IMAGE} AS pipcache
+
 FROM --platform=$TARGETPLATFORM $BASE_IMAGE AS build
 LABEL maintainer="Maksym Sobolyev <sobomax@sippysoft.com>"
 
@@ -11,15 +15,20 @@ WORKDIR /src
 ARG PY_VER
 ARG PYTHON_CMD
 
+RUN mkdir -p /root/.cache/pip
+RUN --mount=type=bind,from=pipcache,source=/,target=/tmp/pip_cache_root \
+ test ! -d /tmp/pip_cache_root/root/.cache/pip || \
+  cp -a /tmp/pip_cache_root/root/.cache/pip /root/.cache/pip
+
 RUN --mount=type=bind,source=scripts/build,target=scripts/build \
- --mount=type=cache,id=python-pip,target=/root/.cache/pip \
  sh -x scripts/build/install_depends_wheels.sh
+RUN --mount=type=bind,source=python/requirements.txt,target=python/requirements.txt \
+ ${PYTHON_CMD} -m pip install -r python/requirements.txt
 
 COPY --exclude=.git --exclude=.github --exclude=docker --exclude=dist \
  --exclude=scripts . .
 
-RUN --mount=type=cache,id=python-pip,target=/root/.cache/pip \
- ${PYTHON_CMD} -m build --wheel
+RUN ${PYTHON_CMD} -m build --wheel
 RUN auditwheel repair dist/*.whl --wheel-dir dist_out
 
 FROM build AS test
@@ -29,4 +38,5 @@ RUN date > dist_out/test_done.ts
 
 FROM scratch AS export
 COPY --from=build /src/dist_out /dist
+COPY --from=build /root/.cache/pip /root/.cache/pip
 COPY --from=test /src/dist_out/test_done.ts /dist

scripts/build/install_depends_wheels.sh

@@ -6,4 +6,4 @@ PYTHON_CMD="${PYTHON_CMD:-"python${PY_VER}"}"
 
 ${PYTHON_CMD} -m ensurepip --upgrade
 ${PYTHON_CMD} -m pip install --upgrade pip
-${PYTHON_CMD} -m pip install --upgrade build setuptools wheel auditwheel numpy
+${PYTHON_CMD} -m pip install --upgrade build setuptools wheel auditwheel