Add mc-send-to-console support (#228)

Author: itzg

Dockerfile

@@ -33,7 +33,8 @@ RUN easy-add --var version=1.5.0 --var app=restify --file {{.app}} --from https:
 
 RUN easy-add --var version=0.5.0 --var app=mc-monitor --file {{.app}} --from https://github.com/itzg/{{.app}}/releases/download/{{.version}}/{{.app}}_{{.version}}_linux_${ARCH}.tar.gz
 
-COPY *.sh /opt/
+COPY scripts/* /opt/
+COPY bin/* /usr/local/bin/
 
 COPY property-definitions.json /etc/bds-property-definitions.json
 

README.md

@@ -188,7 +188,17 @@ For more information [FoxyNoTail](https://www.youtube.com/watch?v=nWBM4UFm0rQ&t=
 
 For more information about managing Bedrock Dedicated Servers in general, [check out this Reddit post](https://old.reddit.com/user/ProfessorValko/comments/9f438p/bedrock_dedicated_server_tutorial/).
 
-## Executing server commands
+## Sending commands to the server
+
+To send individual commands to the server, exec `mc-send-to-console` inside the container passing the server command as its arguments. For example, the following would disable the `falldamage` gamerule:
+
+```shell
+docker exec $container mc-send-to-console gamerule falldamage false
+```
+
+>  NOTE: to see the output/results of the command, use `docker logs -f $container`
+
+## Interactive server console
 
 Assuming you started container with stdin and tty enabled (such as using `-it`), you can attach to the container's console by its name or ID using:
 

bin/mc-send-to-console

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+: "${CONSOLE_IN_NAMED_PIPE:=/var/run/bds-stdin}"
+
+if [ $# = 0 ]; then
+  echo "ERROR: pass console commands as arguments"
+  exit 1
+fi
+
+if [ ! -p "${CONSOLE_IN_NAMED_PIPE}" ]; then
+  echo "ERROR: named pipe ${CONSOLE_IN_NAMED_PIPE} is missing"
+  exit 1
+fi
+
+/usr/local/bin/entrypoint-demoter --match /data bash -c "echo $* > '${CONSOLE_IN_NAMED_PIPE}'"

bedrock-entry.sh renamed to scripts/bedrock-entry.sh

@@ -160,4 +160,8 @@ set-property --file server.properties --bulk /etc/bds-property-definitions.json
 export LD_LIBRARY_PATH=.
 
 echo "Starting Bedrock server..."
-exec ./bedrock_server-${VERSION}
+
+mkfifo /var/run/bds-stdin
+# See https://serverfault.com/a/1088115/196770
+sleep infinity > /var/run/bds-stdin &
+exec ./bedrock_server-"${VERSION}" < /var/run/bds-stdin