Add support for git tokens

These tokens can be used for python dependencies
 for private git repos.
 These changes are made in the main python template.

Signed-off-by: CC007 <[email protected]>

template/python3/Dockerfile

@@ -1,56 +1,88 @@
-FROM --platform=${TARGETPLATFORM:-linux/amd64} ghcr.io/openfaas/classic-watchdog:0.2.0 as watchdog
-FROM --platform=${TARGETPLATFORM:-linux/amd64} python:3-alpine
-
-ARG TARGETPLATFORM
-ARG BUILDPLATFORM
+# Builder stage that allows you to use git modules from private repos
+FROM --platform=${TARGETPLATFORM:-linux/amd64} python:3-alpine as builder
 
-# Allows you to add additional packages via build-arg
+# Basic user, python and certificate setup
 ARG ADDITIONAL_PACKAGE
-
-COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
-RUN chmod +x /usr/bin/fwatchdog
 RUN apk --no-cache add ca-certificates ${ADDITIONAL_PACKAGE}
+RUN addgroup -S app && adduser app -S -G app
+WORKDIR /home/app/
+RUN chown -R app /home/app && \
+    mkdir -p /home/app/python && chown -R app /home/app
+USER app
+ENV PATH=$PATH:/home/app/.local/bin:/home/app/python/bin/
+ENV PYTHONPATH=$PYTHONPATH:/home/app/python
 
+# Token to be provided as argument
+ARG GIT_TOKEN=no_token_set
 
-# Add non root user
-RUN addgroup -S app && adduser app -S -G app
+# Install git and make the git token available as environment variable
+USER root
+RUN apk --no-cache add git
+ENV GIT_TOKEN=${GIT_TOKEN}
 
+# Install template requirements
+USER app
 WORKDIR /home/app/
-
-COPY index.py           .
 COPY requirements.txt   .
+RUN pip install -r requirements.txt --target=/home/app/python
+
+# Install function specific requirements
+RUN mkdir -p function
+WORKDIR /home/app/function/
+COPY function/requirements.txt	.
+RUN pip install -r requirements.txt --target=/home/app/python
 
+FROM --platform=${TARGETPLATFORM:-linux/amd64} ghcr.io/openfaas/classic-watchdog:0.2.0 as watchdog
+
+# Actual image
+FROM --platform=${TARGETPLATFORM:-linux/amd64} python:3-alpine
+
+# Basic user, python and certificate setup
+ARG ADDITIONAL_PACKAGE
+RUN apk --no-cache add ca-certificates ${ADDITIONAL_PACKAGE}
+RUN addgroup -S app && adduser app -S -G app
+WORKDIR /home/app/
 RUN chown -R app /home/app && \
-  mkdir -p /home/app/python && chown -R app /home/app
+    mkdir -p /home/app/python && chown -R app /home/app
 USER app
 ENV PATH=$PATH:/home/app/.local/bin:/home/app/python/bin/
 ENV PYTHONPATH=$PYTHONPATH:/home/app/python
 
-RUN pip install -r requirements.txt --target=/home/app/python
+# Copy over watchdog
+USER root
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
 
+# Copy over template files
+USER app
+WORKDIR /home/app/
+COPY index.py           .
+COPY requirements.txt   .
+
+# Mark the function dir as a module
 RUN mkdir -p function
 RUN touch ./function/__init__.py
 
+# Copy over the function specific requirements file
 WORKDIR /home/app/function/
 COPY function/requirements.txt	.
 
-RUN pip install -r requirements.txt --target=/home/app/python
-
+# Copy over resolved dependencies from builder stage
 WORKDIR /home/app/
+COPY --from=builder /home/app/.cache /home/app/.cache
+COPY --from=builder /home/app/python /home/app/python
 
+# Copy over the specific function code
 USER root
-
 COPY function           function
 
 # Allow any user-id for OpenShift users.
 RUN chown -R app:app ./ && \
-  chmod -R 777 /home/app/python
+    chmod -R 777 /home/app/python
 
+# Prepare and run the watchdog
 USER app
-
 ENV fprocess="python3 index.py"
 EXPOSE 8080
-
 HEALTHCHECK --interval=3s CMD [ -e /tmp/.lock ] || exit 1
-
 CMD ["fwatchdog"]