From 73d4d49d557e1a07af1e67aa66f12d22fcdfa131 Mon Sep 17 00:00:00 2001
From: mpl <mathieu.lonjaret@gmail.com>
Date: Wed, 20 Jul 2016 02:35:20 +0200
Subject: [PATCH] pkg/server: instruction for updating on GCE

Fixes #825

Change-Id: I07dd2502816b6351b6ae71be84e98952cda5056c
---
 pkg/server/status.go | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/pkg/server/status.go b/pkg/server/status.go
index ec743c89f..fef78f282 100644
--- a/pkg/server/status.go
+++ b/pkg/server/status.go
@@ -18,6 +18,7 @@ package server
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"html"
 	"io"
@@ -40,6 +41,8 @@ import (
 	"camlistore.org/pkg/server/app"
 	"camlistore.org/pkg/types/camtypes"
 	"go4.org/jsonconfig"
+
+	"google.golang.org/cloud/compute/metadata"
 )
 
 // StatusHandler publishes server status information.
@@ -208,6 +211,17 @@ func (sh *StatusHandler) serveStatusJSON(rw http.ResponseWriter, req *http.Reque
 	httputil.ReturnJSON(rw, sh.currentStatus())
 }
 
+func (sh *StatusHandler) googleCloudConsole() (string, error) {
+	if !env.OnGCE() {
+		return "", errors.New("not on GCE")
+	}
+	projID, err := metadata.ProjectID()
+	if err != nil {
+		return "", fmt.Errorf("Error getting project ID: %v", err)
+	}
+	return "https://console.cloud.google.com/compute/instances?project=" + projID, nil
+}
+
 var quotedPrefix = regexp.MustCompile(`[;"]/(\S+?/)[&"]`)
 
 func (sh *StatusHandler) serveStatusHTML(rw http.ResponseWriter, req *http.Request) {
@@ -243,8 +257,18 @@ func (sh *StatusHandler) serveStatusHTML(rw http.ResponseWriter, req *http.Reque
 	f("</ul>")
 
 	f("<h2>Admin</h2>")
-	f("<form method='post' action='restart' onsubmit='return confirm(\"Really restart now?\")'><button>restart server</button>")
-	f("<input type='checkbox' name='reindex'> reindex<br></form>")
+	f("<ul>")
+	f("  <li><form method='post' action='restart' onsubmit='return confirm(\"Really restart now?\")'><button>restart server</button>")
+	f("<input type='checkbox' name='reindex'> reindex</form></li>")
+	if env.OnGCE() {
+		console, err := sh.googleCloudConsole()
+		if err != nil {
+			log.Printf("error getting Google Cloud Console URL: %v", err)
+		} else {
+			f("   <li><b>Updating:</b> When a new image for Camlistore on GCE is available, you can update by hitting \"Reset\" (or \"Stop\", then \"Start\") for your instance on your <a href='%s'>Google Cloud Console</a>.<br>Alternatively, you can ssh to your instance and restart the Camlistore service with: <b>sudo systemctl restart camlistored</b>.</li>", console)
+		}
+	}
+	f("</ul>")
 
 	f("<h2>Handlers</h2>")
 	f("<p>As JSON: <a href='status.json'>status.json</a>; and the <a href='%s?camli.mode=config'>discovery JSON</a>.</p>", st.rootPrefix)