Fetch games into a volume at runtime instead of baking them into the image

927MB of the image was just t7g's two CD ISOs, which can't be meaningfully
compressed (already-compressed FMV/audio). Move the smbget/unzip step out
of the Dockerfile and into scripts/fetch_games.sh, run from server.sh on
container start: it populates GAMES_HOME on first run and skips the fetch
if games are already present. run.sh mounts a named volume so the games
survive --rm restarts instead of being re-downloaded every time. Image
drops from 1.6GB to ~690MB; first container start now needs network access
to the vlda-01 SMB share to seed the volume.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NiNnj78HGx1KWyCCo39HSz

Dockerfile

@@ -7,24 +7,18 @@ ENV GAMES_HOME=/opt/games
 ENV SCRIPTS_HOME=/opt/scripts
 ENV PATH=${PATH}:${SCRIPTS_HOME}
 
-# unzip/smbclient are only needed to fetch and extract the games below, so they're
-# purged again in this same layer instead of being left in the final image.
+# unzip/smbclient are needed at runtime now too: the games are no longer baked into the
+# image, fetch_games.sh pulls them into the ${GAMES_HOME} volume on first container start.
 RUN apt-get update && \
     apt-get -y install --no-install-recommends dosbox alsa-utils unzip smbclient && \
-    mkdir -p ${GAMES_HOME} /tmp/apps && \
-    cd /tmp/apps && \
-    smbget -au smb://vlda-01/software/Games/dosbox/stuntcar.zip && \
-    smbget -au smb://vlda-01/software/Games/dosbox/t7g.zip && \
-    unzip -o -d ${GAMES_HOME} "*.zip" && \
-    cd / && \
-    rm -rf /tmp/apps && \
-    apt-get -y purge unzip smbclient && \
-    apt-get -y autoremove && \
     rm -rf /var/lib/apt/lists/*
 
 RUN openssl req -x509 -nodes -newkey rsa:2048 -keyout /tmp/novnc.key -out /tmp/novnc.pem -days 3650 -subj "/C=US/ST=NY/L=NY/O=NY/OU=NY/CN=NY emailAddress=email@example.com"
 RUN touch /root/.Xauthority
 
+RUN mkdir -p ${GAMES_HOME}
+VOLUME ${GAMES_HOME}
+
 ADD scripts ${SCRIPTS_HOME}
 WORKDIR /
 

TODO.md

@@ -1,6 +1,12 @@
 # TODO
 
-- ~~Reduce image size of `jayfield/dosbox-novnc` (currently ~2.3GB).~~ Done: merged the
-  game download/extract steps and the unzip/smbclient install into a single layer (so the
-  downloaded zips and the packages only needed to extract them no longer persist in the
-  final image). 2.31GB -> 1.6GB.
+- ~~Reduce image size of `jayfield/dosbox-novnc` (currently ~2.3GB).~~ Done in two steps:
+  1. Merged the game download/extract steps and the unzip/smbclient install into a single
+     layer (so the downloaded zips and the packages only needed to extract them no longer
+     persist in the final image). 2.31GB -> 1.6GB.
+  2. Stopped baking the games into the image at all (927MB of that was just t7g's two CD
+     ISOs). `scripts/fetch_games.sh` now downloads them from the SMB share into
+     `${GAMES_HOME}` (`/opt/games`) on first container start instead, skipping the fetch if
+     already present. `run.sh` mounts a named volume (`dosbox-games`) so the games persist
+     across `--rm` restarts. 1.6GB -> ~690MB. Container now needs network access to
+     `vlda-01` at runtime (not just build time) for the first start.

run.sh

@@ -1,4 +1,4 @@
 #/bin/bash
 
-docker run --name dosbox-novnc -d --rm --net bridge -e SCREEN_W=1536 -e SCREEN_H=960 --device /dev/snd jayfield/dosbox-novnc
+docker run --name dosbox-novnc -d --rm --net bridge -e SCREEN_W=1536 -e SCREEN_H=960 --device /dev/snd -v dosbox-games:/opt/games jayfield/dosbox-novnc
 

scripts/fetch_games.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -e
+
+SMB_BASE="smb://vlda-01/software/Games/dosbox"
+GAME_ZIPS="stuntcar.zip t7g.zip"
+
+if [ -n "$(ls -A "${GAMES_HOME}" 2>/dev/null)" ]; then
+    echo "Games already present in ${GAMES_HOME}, skipping fetch"
+    exit 0
+fi
+
+echo "Fetching games into ${GAMES_HOME}..."
+TMPDIR=$(mktemp -d)
+trap 'rm -rf "${TMPDIR}"' EXIT
+
+cd "${TMPDIR}"
+for zip in ${GAME_ZIPS}; do
+    smbget -au "${SMB_BASE}/${zip}"
+done
+unzip -o -d "${GAMES_HOME}" "*.zip"

scripts/server.sh

@@ -4,6 +4,8 @@ set -x
 RFB_PORT=59${DISPLAY_NUM}
 NOVNC_PORT=80${DISPLAY_NUM}
 
+${SCRIPTS_HOME}/fetch_games.sh
+
 echo Display at ${DISPLAY} with ${SCREEN_W}x${SCREEN_H}x24
 Xvnc ${DISPLAY} -geometry ${SCREEN_W}x${SCREEN_H} -depth 24 +xinerama -securitytypes none >/var/log/xvfb.log &
 fluxbox &