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# syntax=docker/dockerfile:1.3
# See www/containers.md for documentation on how to use this file.
## ---------------------------------------------------------------------
## STAGE 1: Build static Fossil binary
## ---------------------------------------------------------------------
### We don't pin a more stable version of our base layer because we want
### to build with the latest tools and libraries available in case they
### fixed something that matters to us since the last build. Everything
### below depends on this layer, and so, alas, we toss this container's
### cache on Alpine's release schedule, roughly once a month.
FROM alpine:latest AS bld
WORKDIR /fsl
### Bake the build-time userland into a base layer so it only changes
### when the upstream image is updated or we change the package set.
RUN set -x \
&& apk update \
&& apk upgrade --no-cache \
&& apk add --no-cache \
gcc make \
linux-headers musl-dev \
openssl-dev openssl-libs-static \
zlib-dev zlib-static
### Build Fossil as a separate layer so we don't have to rebuild the
### userland for each iteration of Fossil's dev cycle.
###
### We must cope with a bizarre ADD misfeature here: it unpacks tarballs
### automatically when you give it a local file name but not if you give
### it a /tarball URL! It matters because we default to a URL in case
### you're building outside a Fossil checkout, but when building via the
### container-image target, we avoid a costly hit on fossil-scm.org by
### leveraging its DVCS nature via the "tarball" command and passing the
### resulting file's name in.
ARG FSLCFG=""
ARG FSLVER="trunk"
ARG FSLURL="https://fossil-scm.org/home/tarball/src?r=${FSLVER}"
ENV FSLSTB=/fsl/src.tar.gz
ADD $FSLURL $FSLSTB
RUN set -x \
&& if [ -d $FSLSTB ] ; \
then mv $FSLSTB/src . ; \
else tar -xf src.tar.gz ; fi \
&& src/configure --static CFLAGS='-Os -s' $FSLCFG && make -j16
## ---------------------------------------------------------------------
## STAGE 2: Pare that back to the bare essentials.
## ---------------------------------------------------------------------
FROM busybox AS os
ARG UID=499
### Set up that base OS for our specific use without tying it to
### anything likely to change often. So long as the user leaves
### UID alone, this layer will be durable.
RUN set -x \
&& mkdir e log museum \
&& echo "root:x:0:0:Admin:/:/false" > /e/passwd \
&& echo "root:x:0:root" > /e/group \
&& echo "fossil:x:${UID}:${UID}:User:/museum:/false" >> /e/passwd \
&& echo "fossil:x:${UID}:fossil" >> /e/group
## ---------------------------------------------------------------------
## STAGE 3: Drop BusyBox, too, now that we're done with its /bin/sh &c
## ---------------------------------------------------------------------
FROM scratch AS run
COPY --from=bld --chmod=755 /fsl/fossil /bin/
COPY --from=os --chmod=600 /e/* /etc/
COPY --from=os --chmod=1777 /tmp /tmp/
COPY --from=os --chown=fossil:fossil /log /log/
COPY --from=os --chown=fossil:fossil /museum /museum/
## ---------------------------------------------------------------------
## RUN!
## ---------------------------------------------------------------------
ENV PATH "/bin"
EXPOSE 8080/tcp
USER fossil
ENTRYPOINT [ "fossil", "server" ]
CMD [ \
"--create", \
"--jsmode", "bundled", \
"--user", "admin", \
"museum/repo.fossil" ]
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