Add support for sevice start wrapper (#8676)

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: Austin <vidplace7@gmail.com>

bin/meshtasticd-start.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env sh
+
+INSTANCE=$1
+CONF_DIR="/etc/meshtasticd/config.d"
+VFS_DIR="/var/lib"
+
+# If no instance ID provided, start bare daemon and exit
+echo "no instance ID provided, starting bare meshtasticd service"
+if [ -z "${INSTANCE}" ]; then
+  /usr/bin/meshtasticd
+  exit 0
+fi
+
+# Make VFS dir if it does not exist
+if [ ! -d "${VFS_DIR}/meshtasticd-${INSTANCE}" ]; then
+  echo "vfs for ${INSTANCE} does not exist, creating it."
+  mkdir "${VFS_DIR}/meshtasticd-${INSTANCE}"
+fi
+
+# Abort if config for $INSTANCE does not exist
+if [ ! -f "${CONF_DIR}/config-${INSTANCE}.yaml" ]; then
+  echo "no config for ${INSTANCE} found in ${CONF_DIR}. refusing to start" >&2
+  exit 1
+fi
+
+# Start meshtasticd with instance parameters
+printf "starting meshtasticd-%s..., ${INSTANCE}"
+if /usr/bin/meshtasticd --config="${CONF_DIR}/config-${INSTANCE}.yaml" --fsdir="${VFS_DIR}/meshtasticd-${INSTANCE}"; then
+  echo "ok"
+else
+  echo "failed"
+fi