ci_presubmit: init

This will be, at some point, a script to run on Gerrit presubmit (ie.
right before merge).

For now, you can manually run it to ensure that Everything At Least
Kinda Works.

Change-Id: I28b305fa81a4ca4a8e94ce4daa06fe9ae0184fe8

ci_presubmit.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+# This is a presubmit (on-merge) CI script.
+# Currently no CI runs it - so be a good cyborg, and run it before submitting
+# changes to hscloud.
+
+set -e -o pipefail
+
+if [ -z "$hscloud_root" ]; then
+    echo 2>&1 "Please first source env.sh"
+    exit 1
+fi
+
+cd $hscloud_root
+
+# Test critical tools.
+tools/install.sh
+kubectl version --client=true
+kubecfg version
+prodaccess --help 2>/dev/null
+bazel run //cluster/clustercfg smoketest

cluster/clustercfg/clustercfg.py

@@ -225,6 +225,9 @@ def main():
         return nodestrap(sys.argv[2:], nocerts=True)
     elif mode == "admincreds":
         return admincreds(sys.argv[2:])
+    elif mode == "smoketest":
+        sys.stdout.write("Smoke test passed.")
+        return 0
     else:
         usage()
         return 1