add pipefails

Signed-off-by: Jess Frazelle <acidburn@google.com>

vscode/start.sh

@@ -1,4 +1,11 @@
 #!/bin/bash
+set -e
+set -o pipefail
 
-su user -c /usr/bin/editor
+VSCODE_COMMAND=/usr/bin/code
+if [[ ! -f "${VSCODE_COMMAND}" ]]; then
+	>&2 echo "${VSCODE_COMMAND} does not exist"
+	exit 1
+fi
+su user -c "${VSCODE_COMMAND}"
 sleep infinity