Update commit environment variable

This was causing the commit not to be set.  It broke display languages
since that has a hard dependency on the commit for directory names.
Possibly broke other things.

Author: code-asher

ci/build/build-vscode.sh

@@ -15,7 +15,7 @@ copy-bin-script() {
   local dest="lib/vscode-reh-web-linux-x64/bin/$script"
   cp "lib/vscode/resources/server/bin/$script" "$dest"
   sed -i.bak "s/@@VERSION@@/$(vscode_version)/g" "$dest"
-  sed -i.bak "s/@@COMMIT@@/$VSCODE_DISTRO_COMMIT/g" "$dest"
+  sed -i.bak "s/@@COMMIT@@/$BUILD_SOURCEVERSION/g" "$dest"
   sed -i.bak "s/@@APPNAME@@/code-server/g" "$dest"
 
   # Fix Node path on Darwin and Linux.
@@ -51,8 +51,8 @@ main() {
   # Set the commit Code will embed into the product.json.  We need to do this
   # since Code tries to get the commit from the `.git` directory which will fail
   # as it is a submodule.
-  export VSCODE_DISTRO_COMMIT
-  VSCODE_DISTRO_COMMIT=$(git rev-parse HEAD)
+  export BUILD_SOURCEVERSION
+  BUILD_SOURCEVERSION=$(git rev-parse HEAD)
 
   # Add the date, our name, links, and enable telemetry (this just makes
   # telemetry available; telemetry can still be disabled by flag or setting).
@@ -109,6 +109,15 @@ EOF
 
   popd
 
+  pushd lib/vscode-reh-web-linux-x64
+  # Make sure Code took the version we set in the environment variable.  Not
+  # having a version will break display languages.
+  if ! jq -e .commit product.json ; then
+    echo "'commit' is missing from product.json"
+    exit 1
+  fi
+  popd
+
   # These provide a `code-server` command in the integrated terminal to open
   # files in the current instance.
   delete-bin-script remote-cli/code-server