caddy/update.sh

#!/bin/bash

set -Eeuo pipefail

gitHubUpstreamUrl='https://github.com/caddyserver/caddy-docker'

join() {
	local sep="$1"; shift
	local out; printf -v out "${sep//%/%%}%s" "$@"
	echo "${out#$sep}"
}

_wget() {
	wget -qO- -o /dev/null "$@"
}

caddyStackbrew="$(_wget "$gitHubUpstreamUrl/raw/master/stackbrew-config.yaml")"
caddyVersion="$(echo "$caddyStackbrew" | grep -oP '(?<=caddy_version: '"'"').+(?='"'"')')"

cat > scratch/Dockerfile <<-EODF
FROM caddy:$caddyVersion-alpine as build

RUN apk add --no-cache upx ca-certificates \
    && upx --ultra-brute /usr/bin/caddy \
    && caddy version

FROM scratch

COPY --from=build /etc/caddy/Caddyfile /etc/caddy/Caddyfile
COPY --from=build /usr/share/caddy/index.html /usr/share/caddy/index.html
COPY --from=build /usr/bin/caddy /usr/bin/caddy
COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt

ENV XDG_CONFIG_HOME=/config
ENV XDG_DATA_HOME=/data
ENV HOME=/

VOLUME /config
VOLUME /data

LABEL org.opencontainers.image.version=v$caddyVersion
LABEL org.opencontainers.image.title="Caddy (productionwentdown fork)"
LABEL org.opencontainers.image.description="a powerful, enterprise-ready, open source web server with automatic HTTPS written in Go"
LABEL org.opencontainers.image.url=https://productionwentdown.makerforce.io
LABEL org.opencontainers.image.documentation=https://caddyserver.com/docs
LABEL org.opencontainers.image.vendor="productionwentdown"
LABEL org.opencontainers.image.licenses=Apache-2.0
LABEL org.opencontainers.image.source="https://github.com/productionwentdown/caddy"

EXPOSE 80
EXPOSE 443
EXPOSE 2019

CMD ["/usr/bin/caddy", "run", "--config", "/etc/caddy/Caddyfile", "--adapter", "caddyfile"]
EODF