use docker cli binary instead of install from repo

Dockerfile

@@ -7,8 +7,11 @@ FROM linuxserver/docker-compose:arm64v8-${COMPOSE_TAG} as compose-arm64
 FROM lsiobase/alpine:3.11 as buildstage
 
 COPY --from=compose-amd64 /usr/local/bin/docker-compose /root-layer/docker-compose/docker-compose_x86_64
+COPY --from=compose-amd64 /usr/local/bin/docker /root-layer/docker-compose/docker_x86_64
 COPY --from=compose-arm32 /usr/local/bin/docker-compose /root-layer/docker-compose/docker-compose_armv7l
+COPY --from=compose-arm32 /usr/local/bin/docker /root-layer/docker-compose/docker_armv7l
 COPY --from=compose-arm64 /usr/local/bin/docker-compose /root-layer/docker-compose/docker-compose_aarch64
+COPY --from=compose-arm64 /usr/local/bin/docker /root-layer/docker-compose/docker_aarch64
 COPY root/ /root-layer/
 
 # runtime stage

README.md

@@ -1,6 +1,6 @@
 # Docker - Docker mod for code-server
 
-This mod adds docker and docker-compose to code-server, to be installed/updated during container start.
+This mod adds docker and docker-compose binaries to code-server.
 
 **IMPORTANT NOTE**: For docker access inside code-server, a volume mapping needs to be added for `/var/run/docker.sock:/var/run/docker.sock` in code-server docker run/create/compose.
 

root/etc/cont-init.d/98-docker

@@ -1,33 +1,29 @@
 #!/usr/bin/with-contenv bash
 
-echo "**** installing docker environment ****"
+echo "**** installing docker and docker compose ****"
-if ! dpkg -l | grep gnupg > /dev/null; then
-  apt-get update && apt-get install -y gnupg
-fi
-[[ ! -f "/etc/apt/sources.list.d/docker-ce.list" ]] && \
-  curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add - && \
-  source /etc/os-release && \
-  echo "deb https://download.docker.com/linux/ubuntu $UBUNTU_CODENAME stable" > /etc/apt/sources.list.d/docker-ce.list
-apt-get update && apt-get install -y --no-install-recommends \
-  docker-ce
-echo "**** fixing permissions ****"
-DOCKER_GID=$(stat -c '%g' "/var/run/docker.sock")
-if id -G abc | grep -qw "$DOCKER_GID"; then
-  exit 0
-else
-  DOCKER_NAME=$(getent group "${DOCKER_GID}" | awk -F: '{print $1}')
-  if [ -z "${DOCKER_NAME}" ]; then
-    DOCKER_NAME="dockergroup"
-    groupadd -g "${DOCKER_GID}" "${DOCKER_NAME}"
-  fi
-  usermod -aG "${DOCKER_NAME}" abc
-fi
-echo "**** installing docker compose ****"
 ARCH=$(uname -m)
 if [ -f "/docker-compose/docker-compose_${ARCH}" ]; then
+  echo "Copying over docker and docker-compose binaries"
   mv "/docker-compose/docker-compose_${ARCH}" /usr/local/bin/docker-compose
+  mv "/docker-compose/docker_${ARCH}" /usr/local/bin/docker
   chmod +x /usr/local/bin/docker-compose
   rm -rf /docker-compose
 else
-  echo "docker-compose already installed, skipping"
+  echo "**** docker and docker-compose already installed, skipping ****"
+fi
+
+if [ -S /var/run/docker.sock ]; then
+  DOCKER_GID=$(stat -c '%g' "/var/run/docker.sock")
+  if id -G abc | grep -qw "$DOCKER_GID"; then
+    exit 0
+  else
+    DOCKER_NAME=$(getent group "${DOCKER_GID}" | awk -F: '{print $1}')
+    if [ -z "${DOCKER_NAME}" ]; then
+      DOCKER_NAME="dockergroup"
+      groupadd -g "${DOCKER_GID}" "${DOCKER_NAME}"
+    fi
+    usermod -aG "${DOCKER_NAME}" abc
+  fi
+else
+  echo "**** Please map /var/run/docker.sock or docker won't work inside this container ****"
 fi