Initial setup

The point of this is to separate dockerfiles and build them on top of
each other wherever possible.

Then we can build them interdependently with makefiles!

Makefile

@@ -0,0 +1,11 @@
+#.PHONY: built/%.sentinel
+
+docker_src = /devel/docker
+${docker_src}/built/%.sentinel: ${docker_src}/%.dockerfile
+	grep -e '^FROM' "$*".dockerfile | awk '{print $$2}' \
+		| tr : _ | xargs -I{} $(MAKE) ${docker_src}/built/{}.sentinel;
+	cd ${docker_src}; docker build -f $< --tag $* .;
+	touch $@;
+
+${docker_src}/built/debian_10.sentinel:
+	docker pull "debian:10" && touch $@;

builder-entry.sh

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+#!/bin/bash
+
+chown buildbot:buildbot /builder
+
+cd /builder
+
+/usr/sbin/gosu buildbot /usr/bin/screen "$@"
+

builder-start.sh

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+#!/bin/bash
+
+[ -x /input.sh ] && /input.sh
+
+/bin/bash
+
+[ -x /output.sh ] && /output.sh

builder.dockerfile

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+FROM        debian:10
+
+ARG         DEBIAN_FRONTEND=noninteractive
+
+USER root
+
+RUN echo 'deb http://deb.debian.org/debian testing main' \
+		> /etc/apt/sources.list.d/testing.list && \
+	apt-get update && \
+	apt-get install -t buster -y \
+		pwgen \
+		locales \
+		build-essential \
+		git-core \
+		subversion \
+		libncurses5-dev \
+		gawk \
+		unzip \
+		pv \
+		gosu \
+		signify-openbsd \
+		python3 \
+		wget \
+		curl \
+		ccache \
+		emacs \
+		screen \
+		rsync && \
+	apt-get clean && \
+	localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8
+
+ENV LANG=en_US.utf8
+
+COPY builder-entry.sh /entry.sh
+COPY builder-start.sh /start.sh
+
+RUN mkdir /builder && \
+    useradd --home /builder --shell /bin/bash buildbot && \
+    chown buildbot:buildbot /builder && \
+    chmod 0755 /entry.sh /start.sh
+
+ENTRYPOINT [ "/entry.sh" ]
+CMD [ "/start.sh" ]

openwrt-builder-commit.dockerfile

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+FROM openwrt-builder
+
+ARG commit
+
+RUN git pull origin master
+
+RUN git checkout ${commit}
+
+

openwrt-builder.dockerfile

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+FROM builder
+
+USER buildbot
+
+WORKDIR /builder/openwrt
+
+RUN git clone https://git.laboratoryb.org/hurricos/openwrt-mirror --branch master .
+
+