create dropin.cache at build time (#2414)

* create dropin.cache at build time
* set SOURCE_DATE_EPOCH for use in Docker

.github/workflows/docker.yml

@@ -41,6 +41,9 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: set SOURCE_DATE_EPOCH
+        run: echo "SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct)" >> $GITHUB_ENV
+
       # Add support for more platforms with QEMU (optional)
       # https://github.com/docker/setup-qemu-action
       - name: Set up QEMU

bin/regen-dropin.cache

@@ -0,0 +1,4 @@
+#!/usr/bin/env python
+# This is run by packaging tools to update `dropin.cache` to keep track of Twisted's plugin cache
+from twisted.plugin import IPlugin, getPlugins
+print(list(getPlugins(IPlugin)))

docker/Dockerfile

@@ -3,7 +3,7 @@
 # `runtime` is stripped down.
 
 ARG ARCH=
-ARG BUILD_DATE
+ARG SOURCE_DATE_EPOCH
 ARG TAG
 FROM ${ARCH}debian:bookworm-slim AS builder
 
@@ -63,7 +63,6 @@ COPY --chown=${COWRIE_USER}:${COWRIE_GROUP} . ${COWRIE_HOME}/cowrie-git
 FROM gcr.io/distroless/python3-debian12 AS runtime
 #FROM gcr.io/distroless/python3-debian12:debug AS runtime
 
-LABEL org.opencontainers.image.created=${BUILD_DATE}
 LABEL org.opencontainers.image.authors="Michel Oosterhof <michel@oosterhof.net>"
 LABEL org.opencontainers.image.url="https://cowrie.org/"
 LABEL org.opencontainers.image.documentation="https://cowrie.readthedocs.io"
@@ -114,6 +113,8 @@ ENV PATH=${COWRIE_HOME}/cowrie-env/bin:${PATH}
 ENV PYTHONPATH=${COWRIE_HOME}/cowrie-git/src
 ENV PYTHONUNBUFFERED=1
 
+RUN [ "python3", "/cowrie/cowrie-git/bin/regen-dropin.cache" ]
+
 ENTRYPOINT [ "/cowrie/cowrie-env/bin/python3" ]
 CMD [ "/cowrie/cowrie-env/bin/twistd", "-n", "--umask=0022", "--pidfile=", "cowrie" ]