A first and simple input->output container

Dockerfile

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+FROM openjdk:13-alpine
+
+MAINTAINER https://github.com/saibotk/BlockMap-Docker
+
+ARG USER=blockmap
+ARG GROUP=blockmap
+ARG PUID=844
+ARG PGID=844
+
+ENV OUTPUT=/blockmap/output \
+	INPUT_OVERWORLD=/blockmap/input/region \
+	INPUT_NETHER=/blockmap/input/DIM1/region \
+	INPUT_END=/blockmap/input/DIM-1/region \
+	VERSION=1.3.0 \
+	SHA1=cada13d8c9bba4a8dd1ed3017fd04a4a03695ca3
+
+RUN mkdir -p /opt/blockmap /blockmap && \
+	apk add --update --no-cache su-exec binutils gettext libintl && \
+	apk add --update --no-cache --virtual .build-deps curl && \
+	curl -sSL https://github.com/Minecraft-Technik-Wiki/BlockMap/releases/download/$VERSION/BlockMap-$VERSION.jar -o /opt/blockmap/BlockMap.jar && \
+	echo "$SHA1  /opt/blockmap/BlockMap.jar" | sha1sum -c && \
+	chmod ugo=rwx /opt/blockmap && \
+	ln -s $INPUT_OVERWORLD /opt/blockmap/overworld && \
+	ln -s $INPUT_NETHER /opt/blockmap/nether && \
+	ln -s $INPUT_END /opt/blockmap/end && \
+	ln -s $OUTPUT /opt/blockmap/output && \
+	apk del .build-deps && \
+	addgroup -g $PGID -S $GROUP && \
+	adduser -u $PUID -G $GROUP -s /bin/sh -SDH $USER && \
+	chown -R $USER:$GROUP /opt/blockmap /blockmap
+
+COPY files/ /
+
+ENTRYPOINT ["/docker-entrypoint.sh"]

files/docker-entrypoint.sh

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+#!/bin/sh +x
+# Stop this script on the first failure (e.g. cannot create the output folder)
+set -e
+
+# This script renders one or more worlds with different settings. It is an example for how to use BlockMap in scripts. Adapt these
+# variables to point to the required data for
+# this to work. Further below are the actual render commands. Feel free to adapt them to your needs.
+#
+# The current configuration will render each dimension at least once, the overworld even multiple times (ocean ground view and
+# cave view). All images are written to a different
+# subfolder for each setting.
+
+WORLD_FOLDER_OVERWORLD=/opt/blockmap/overworld
+WORLD_FOLDER_NETHER=/opt/blockmap/nether
+WORLD_FOLDER_END=/opt/blockmap/end
+OUTPUT_DIR=/opt/blockmap/output
+BLOCKMAP_FILE=/opt/blockmap/BlockMap.jar
+
+# mkdir -p $OUTPUT_DIR
+ls -l /opt/blockmap
+# A simple and plain overworld view
+echo "[INFO] Rendering overworld..."
+mkdir -p $OUTPUT_DIR/overworld
+java -jar $BLOCKMAP_FILE -v render -l -o=$OUTPUT_DIR/overworld $WORLD_FOLDER_OVERWORLD save --world-name="Overworld" --file="$OUTPUT_DIR/rendered.json"
+# The ocean grounds of the overworld
+echo "[INFO] Rendering overworld_ocean..."
+mkdir -p $OUTPUT_DIR/overworld_ocean
+java -jar $BLOCKMAP_FILE -v render -l -o=$OUTPUT_DIR/overworld_ocean -c=OCEAN_GROUND $WORLD_FOLDER_OVERWORLD save --world-name="Overworld (Ocean)" --file="$OUTPUT_DIR/rendered.json"
+# All caves up to height 30
+echo "[INFO] Rendering overworld_cave..."
+mkdir -p $OUTPUT_DIR/overworld_cave
+java -jar $BLOCKMAP_FILE -v render -l -o=$OUTPUT_DIR/overworld_cave -c=CAVES --max-height=30 $WORLD_FOLDER_OVERWORLD save --world-name="Overworld (Cave)" --file="$OUTPUT_DIR/rendered.json"
+# The nether up to height 64
+echo "[INFO] Rendering overworld_nether..."
+mkdir -p $OUTPUT_DIR/overworld_nether
+java -jar $BLOCKMAP_FILE -v render -l -o=$OUTPUT_DIR/nether --max-height=64 $WORLD_FOLDER_NETHER save --world-name="Nether" --file="$OUTPUT_DIR/rendered.json"
+# A plain view of the end
+echo "[INFO] Rendering overworld_end..."
+mkdir -p $OUTPUT_DIR/overworld_end
+java -jar $BLOCKMAP_FILE -v render -l -o=$OUTPUT_DIR/end $WORLD_FOLDER_END save --world-name="End" --file="$OUTPUT_DIR/rendered.json"
+echo "[INFO] Rendering finished!"