syncthing/Dockerfile

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ARG GOVERSION=latest
#
# Maybe build Syncthing. This is a bit ugly as we can't make an entire
# section of the Dockerfile conditional, so we end up always pulling the
# golang image as builder. Then we check if the executable we need already
# exists (pre-built) otherwise we build it.
#
FROM golang:$GOVERSION AS builder
ARG BUILD_USER
ARG BUILD_HOST
ARG TARGETARCH
WORKDIR /src
COPY . .
ENV CGO_ENABLED=0
RUN if [ ! -f syncthing-linux-$TARGETARCH ] ; then \
go run build.go -no-upgrade build syncthing ; \
mv syncthing syncthing-linux-$TARGETARCH ; \
fi
#
# The rest of the Dockerfile uses the binary from the builder, prebuilt or
# not.
#
FROM alpine
ARG TARGETARCH
EXPOSE 8384 22000/tcp 22000/udp 21027/udp
VOLUME ["/var/syncthing"]
RUN apk add --no-cache ca-certificates curl libcap su-exec tzdata
COPY --from=builder /src/syncthing-linux-$TARGETARCH /bin/syncthing
COPY --from=builder /src/script/docker-entrypoint.sh /bin/entrypoint.sh
ENV PUID=1000 PGID=1000 HOME=/var/syncthing
HEALTHCHECK --interval=1m --timeout=10s \
CMD curl -fkLsS -m 2 127.0.0.1:8384/rest/noauth/health | grep -o --color=never OK || exit 1
ENV STGUIADDRESS=0.0.0.0:8384
RUN chmod 755 /bin/entrypoint.sh
ENTRYPOINT ["/bin/entrypoint.sh", "/bin/syncthing", "-home", "/var/syncthing/config"]