Add linting steps and improve testing steps

scripts/cacher.sh

@@ -46,7 +46,18 @@ main() {
 
   # The action is determined by the name of the step.
   case $DRONE_STEP_NAME in
-    *restore*) restore "$branch" "$DRONE_REPO_BRANCH" ;;
+    *restore*)
+      # Sub-modules must be pulled first since extracting the cache directories
+      # will prevent git from cloning into them.
+      git submodule update --init
+
+      restore "$branch" "$DRONE_REPO_BRANCH"
+
+      # Now make sure the pulled Node modules are up to date.
+      YARN_CACHE_FOLDER="$(pwd)/yarn-cache"
+      export YARN_CACHE_FOLDER
+      yarn
+    ;;
     *rebuild*|*package*) package "$branch" ;;
     *) exit 1 ;;
   esac

scripts/ci.bash

@@ -3,6 +3,7 @@
 
 set -euo pipefail
 
+# This script assumes that yarn has already ran.
 function main() {
   cd "$(dirname "${0}")/.."
 
@@ -21,10 +22,6 @@ function main() {
     export PACKAGE="true"
   fi
 
-  if [[ -z ${SKIP_YARN:-} ]] ; then
-    yarn
-  fi
-
   yarn build
   yarn binary
   if [[ -n ${PACKAGE:-} ]] ; then

scripts/test.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env sh
+# test.sh -- Simple build test.
+
+set -eu
+
+main() {
+  cd "$(dirname "$0")/.."
+
+  # The main goal here is to ensure that the build fully completed and the
+  # result looks usable.
+  version=$(node ./build/out/node/entry.js --version --json)
+  echo "Got '$version' for the version"
+  case $version in
+    "{ codeServer":*) exit 0 ;;
+    *) exit 1 ;;
+  esac
+}
+
+main "$@"