Add update script

ci/build/update-vscode.sh

@@ -0,0 +1,151 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail
+
+function remove_patches() {
+  local -i exit_code=0
+  quilt pop -af || exit_code=$?
+  case $exit_code in
+    # Sucessfully removed.
+    0) ;;
+    # No more patches to remove.
+    2) ;;
+    # Some error.
+    *) return $exit_code ;;
+  esac
+}
+
+function update_vscode() {
+  pushd lib/vscode
+  if ! git checkout "$VERSION" ; then
+    echo "$VERSION does not exist locally, fetching..."
+    git fetch --all --prune
+    git checkout "$VERSION"
+  fi
+  popd
+}
+
+function refresh_patches() {
+  local -i exit_code=0
+  while quilt push ; ! (( exit_code=$? )) ; do
+    quilt refresh
+    echo # Extra new line for separation.
+  done
+  case $exit_code in
+    # No more patches to apply.
+    2) ;;
+    # Some error.
+    *) return $exit_code ;;
+  esac
+}
+
+function update_node() {
+  local node_version
+  node_version=$(cat .node-version)
+  if [[ $node_version == $target_node_version ]] ; then
+    echo "$node_version already matches $target_node_version"
+  else
+    echo "Updating from $node_version to $target_node_version..."
+    echo "$target_node_version" > .node-version
+  fi
+}
+
+function get-webview-script-hash() {
+  local html
+  html=$(<$1)
+  local start_tag='<script async type="module">'
+  local end_tag="</script>"
+  html=${html##*$start_tag}
+  html=${html%%$end_tag*}
+  echo -n "$html" | openssl sha256 -binary | openssl base64
+}
+
+function update_csp() {
+  local -i exit_code=0
+  # Move back to the webview patch so it can be refreshed.
+  quilt pop webview || exit_code=$?
+  case $exit_code in
+    # Successfully moved.
+    0) ;;
+    # Already at the patch.
+    2) ;;
+    # Some error.
+    *) return $exit_code ;;
+  esac
+  local file=lib/vscode/src/vs/workbench/contrib/webview/browser/pre/index.html
+  local hash
+  hash=$(get-webview-script-hash "$file")
+  echo "Calculated hash as $hash"
+  # Use octothorpe as a delimiter since the hash may contain a slash.
+  sed -i.bak "s#script-src 'sha256-[^']\+'#script-src 'sha256-$hash'#" "$file"
+  quilt refresh
+  # Get patched back up.
+  quilt push -a
+}
+
+function run() {
+  local -i failed=0
+  rm -f .cache/checklist
+  while (( $# )) ; do
+    local name=$1 ; shift
+    local fn=$1 ; shift
+    # Only run if an earlier step has not failed.
+    if [[ $failed == 0 ]] ; then
+      echo "[+] $name..."
+      if $fn ; then
+        echo "- [X] $name" >> .cache/checklist
+      else
+        ((failed++))
+      fi
+    fi
+    # For all failed steps, write out an empty checkbox.
+    if [[ $failed != 0 ]] ; then
+      echo "- [ ] $name" >> .cache/checklist
+    fi
+  done
+  if [[ $failed != 0 ]] ; then
+    return 1
+  fi
+}
+
+function add_changelog() {
+  local file=CHANGELOG.md
+  if grep "Code $VERSION" "$file" ; then
+    echo "Changelog for $VERSION already exists"
+  else
+    # TODO: This is not exactly robust.  In particular, it needs to handle if
+    # there is already a "changed" section.
+    sed -i.bak "s/## Unreleased/## Unreleased\n\nCode v$VERSION\n\n### Changed\n\n- Update to Code $VERSION/" "$file"
+  fi
+}
+
+function main() {
+  cd "$(dirname "${0}")/../.."
+
+  source ./ci/lib.sh
+
+  local target_node_version
+  target_node_version=$(grep target lib/vscode/remote/.npmrc | awk -F= '{print $2}' | tr -d '"')
+
+  declare -a steps
+  # Removing patches only needs to be done locally; in CI we start from a fresh
+  # clone each time.
+  if [[ ! ${CI-} ]] ; then
+    steps+=("Remove patches" "remove_patches")
+  fi
+
+  steps+=(
+    "Update VS Code to $VERSION" "update_vscode"
+    "Refresh VS Code patches" "refresh_patches"
+    "Set Node version to $target_node_version" "update_node"
+    "Update CSP webview hash" "update_csp"
+    "Add changelog note" "add_changelog"
+  )
+
+  run "${steps[@]}"
+
+  # This step is always manual.
+  echo "- [ ] Verify changelog" >> .cache/checklist
+}
+
+main "$@"