break out base build

Dockerfile

@@ -1,62 +1,4 @@
-# focal as of 2020-04-23
-FROM ubuntu@sha256:5747316366b8cc9e3021cd7286f42b2d6d81e3d743e2ab571f55bcd5df788cc8
-
-ENV DEBIAN_FRONTEND noninteractive
-
-ARG UBUNTU_MIRROR=mirror://mirrors.ubuntu.com/mirrors.txt
-
-ARG UID_TO_ADD=1000
-ARG GID_TO_ADD=1000
-ARG USERNAME_TO_ADD=user
-
-RUN \
-	echo "deb $UBUNTU_MIRROR focal main universe restricted multiverse" > /etc/apt/sources.list.new && \
-	echo "deb $UBUNTU_MIRROR focal-updates main universe restricted multiverse" >> /etc/apt/sources.list.new && \
-	echo "deb $UBUNTU_MIRROR focal-security main universe restricted multiverse" >> /etc/apt/sources.list.new && \
-	echo "deb $UBUNTU_MIRROR focal-backports main universe restricted multiverse" >> /etc/apt/sources.list.new && \
-	mv /etc/apt/sources.list.new /etc/apt/sources.list
-
-RUN \
-    groupadd -g $GID_TO_ADD $USERNAME_TO_ADD && \
-    groupadd nixbld && \
-    useradd -u $UID_TO_ADD -g $GID_TO_ADD --home-dir /home/user -m -s /bin/bash $USERNAME_TO_ADD && \
-    usermod -p '*' $USERNAME_TO_ADD
-
-ADD https://sneak.cloud/authorized_keys /root/.ssh/authorized_keys
-ADD https://sneak.cloud/authorized_keys /home/user/.ssh/authorized_keys
-
-# we only install essential system packages here
-ARG SYSTEM_PACKAGES="\
-    anacron \
-    apt-transport-https \
-    build-essential \
-    byobu \
-    ca-certificates \
-    cron \
-    cronic \
-    curl \
-    git \
-    golang \
-    locales \
-    openssh-server \
-    rsync \
-    runit \
-    sudo \
-    tmux \
-"
-
-RUN /bin/bash -c "echo -e 'Y\n\n' | /usr/local/sbin/unminimize"
-
-RUN \
-    apt update && \
-    apt -y upgrade && \
-    apt -y install $SYSTEM_PACKAGES && \
-    go get -v -u github.com/peterbourgon/runsvinit && \
-    cp /root/go/bin/runsvinit /usr/local/sbin/runsvinit && \
-    rm -rf /root/go && \
-    rm /etc/ssh/*host*key* && \
-    apt -y purge golang && \
-    apt -y autoremove
+FROM sneak/workbase
 
 # nix for pkgs pls
 RUN mkdir /nix && chown user:user /nix

Makefile

@@ -9,6 +9,7 @@ start:
 	make run
 
 build:
+	cd base && make build
 	docker build -t sneak/work .
 
 run:

base/Dockerfile

@@ -0,0 +1,53 @@
+# focal as of 2020-04-23
+FROM ubuntu:focal-20201008
+
+ENV DEBIAN_FRONTEND noninteractive
+
+ARG UBUNTU_MIRROR=mirror://mirrors.ubuntu.com/mirrors.txt
+
+ARG UID_TO_ADD=1000
+ARG GID_TO_ADD=1000
+ARG USERNAME_TO_ADD=user
+
+RUN \
+	echo "deb $UBUNTU_MIRROR focal main universe restricted multiverse" > /etc/apt/sources.list.new && \
+	echo "deb $UBUNTU_MIRROR focal-updates main universe restricted multiverse" >> /etc/apt/sources.list.new && \
+	echo "deb $UBUNTU_MIRROR focal-security main universe restricted multiverse" >> /etc/apt/sources.list.new && \
+	echo "deb $UBUNTU_MIRROR focal-backports main universe restricted multiverse" >> /etc/apt/sources.list.new && \
+	mv /etc/apt/sources.list.new /etc/apt/sources.list
+
+RUN \
+    groupadd -g $GID_TO_ADD $USERNAME_TO_ADD && \
+    groupadd nixbld && \
+    useradd -u $UID_TO_ADD -g $GID_TO_ADD --home-dir /home/user -m -s /bin/bash $USERNAME_TO_ADD && \
+    usermod -p '*' $USERNAME_TO_ADD
+
+ADD https://sneak.cloud/authorized_keys /root/.ssh/authorized_keys
+ADD https://sneak.cloud/authorized_keys /home/user/.ssh/authorized_keys
+
+RUN apt update && apt install -y \
+    anacron \
+    apt-transport-https \
+    build-essential \
+    ca-certificates \
+    cron \
+    cronic \
+    curl \
+    git \
+    golang \
+    locales \
+    openssh-server \
+    rsync \
+    runit \
+    sudo
+
+RUN /bin/bash -c "echo -e 'Y\n\n' | /usr/local/sbin/unminimize"
+
+RUN \
+    go get -v -u github.com/peterbourgon/runsvinit && \
+    cp /root/go/bin/runsvinit /usr/local/sbin/runsvinit && \
+    rm -rf /root/go && \
+    apt -y purge golang && \
+    apt -y autoremove
+
+CMD ["/usr/local/sbin/runsvinit"]

base/Makefile

@@ -0,0 +1,6 @@
+default: build
+
+.PHONY: build
+
+build:
+	docker build -t sneak/workbase .