Add a docker container for rsync.

This is cribbed off of my old work at
https://gitweb.gentoo.org/dev/antarus.git/tree/src/infra.gentoo.org/rsync-node.

Basically its a stage3 that serves rsync atomically. It needs some tests
and some CI.

Signed-off-by: Alec Warner <antarus@gentoo.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..73a69da
--- /dev/null
+++ b/Dockerfile
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+# Base Image
+FROM gentoo/stage3-amd64-hardened:latest AS base
+WORKDIR /
+
+COPY wrap_rsync.sh /opt/rsync/wrap_rsync.sh
+COPY ./rsync-mirror /etc/xinetd.d/rsync-mirror
+
+# Normally I would advocate for ARG here and pass arguments to wrap_rsync.
+# This would enable new docker builds with arguments like:
+# docker build . --build_arg WAIT_TIME=30m -t gentoo/rsync
+# However, ARG's cannot be passed to ENTRYPOINTs, so we set these as ENV instead.
+
+# Mirror to get data from.
+ENV SOURCE_MIRROR=rsync://turnstone.gentoo.org./gentoo-portage
+# ENV SOURCE_MIRROR=rsync://rsync.us.gentoo.org/gentoo-portage
+
+# Possibly a stateful volume
+ENV DEST_DIR=/srv/gentoo
+# A memory-backed volume
+ENV TMP_DIR=/srv/ephemeral
+
+# How long to wait between syncs; must be a valid argument to sleep
+ENV WAIT_TIME=30m
+
+# Create TMP_DIR and DEST_DIR
+WORKDIR $TMP_DIR
+WORKDIR $DEST_DIR
+
+# Expose Rsync port
+EXPOSE 873
+
+# Stop xinetd; wrap_rsync will start it when the container is started.
+CMD /etc/init.d/xinetd stop
+
+# Execute wrapper.
+ENTRYPOINT /opt/rsync/wrap_rsync.sh