Fix addon devcontainer not being able to build addons (#135)

* Fix addon devcontainer not being able to build addons

* Refactor workspaceMount in devcontainer.json

Author: felipecrs

addons/devcontainer.json

@@ -4,6 +4,8 @@
   "appPort": ["7123:8123", "7357:4357"],
   "postStartCommand": "bash devcontainer_bootstrap",
   "runArgs": ["-e", "GIT_EDITOR=code --wait", "--privileged"],
+  "workspaceFolder": "/mnt/supervisor/addons/local/${localWorkspaceFolderBasename}",
+  "workspaceMount": "source=${localWorkspaceFolder},target=${containerWorkspaceFolder},type=bind,consistency=cached",
   "containerEnv": {
     "WORKSPACE_DIRECTORY": "${containerWorkspaceFolder}"
   },

addons/rootfs/usr/bin/devcontainer_bootstrap

@@ -4,4 +4,12 @@ set -e
 
 bash /usr/bin/supervisor_bootstrap
 
-exit 0
+workspace_mount="/mnt/supervisor/addons/local/$(basename "${WORKSPACE_DIRECTORY:?}")"
+if ! mountpoint -q "${workspace_mount}"; then
+    echo "WARNING: Mounting ${WORKSPACE_DIRECTORY} to ${workspace_mount}." >&2
+    echo "To avoid this warning, see https://github.com/home-assistant/devcontainer/pull/135." >&2
+    sudo mkdir -p "${workspace_mount}"
+    sudo mount --bind "${WORKSPACE_DIRECTORY}" "${workspace_mount}"
+fi
+
+exit 0

addons/rootfs/usr/bin/supervisor_run

@@ -22,7 +22,6 @@ function run_supervisor() {
         -v /run/dbus:/run/dbus:ro \
         -v /run/udev:/run/udev:ro \
         -v /mnt/supervisor:/data:rw \
-        -v "$WORKSPACE_DIRECTORY":/data/addons/local:rw \
         -v /etc/machine-id:/etc/machine-id:ro \
         -e SUPERVISOR_SHARE="/mnt/supervisor" \
         -e SUPERVISOR_NAME=hassio_supervisor \