Implemented simple update checker. If the local SHA doesn't match the SHA of master, the 'Update Available' note will show up in the header.

This won't currently work, since we're working out of the screenly-ui branch.

server.py

@@ -18,7 +18,7 @@ from urlparse import urlparse
 import json
 from uptime import uptime
 from re import split as re_split
-
+from sh import git
 import ConfigParser
 
 #from StringIO import StringIO
@@ -161,6 +161,29 @@ def api_error(error):
     return json_dump({'error': error})
 
 
+def is_up_to_date():
+    """
+    Determine if there is any update available.
+    We check the Github master SHA (via stats.screenlyapp.com)
+    and compare it to the local SHA.
+    """
+
+    try:
+        local_sha = git('rev-parse', 'HEAD')
+    except:
+        return False
+
+    try:
+        latest_sha = req_get('http://stats.screenlyapp.com/latest').content.strip()
+    except:
+        return False
+
+    if local_sha == latest_sha:
+        return True
+    else:
+        return False
+
+
 ################################
 # API
 ################################
@@ -312,7 +335,7 @@ def remove_asset(asset_id):
 @route('/')
 def viewIndex():
     assets = get_assets_grouped()
-    return haml_template('index', assets=assets)
+    return haml_template('index', assets=assets, up_to_date=is_up_to_date())
 
 
 @route('/settings', method=["GET", "POST"])
@@ -341,7 +364,7 @@ def settings_page():
     context['audio_output'] = config.get('viewer', 'audio_output')
     context['shuffle_playlist'] = config.get('viewer', 'shuffle_playlist')
 
-    return haml_template('settings', **context)
+    return haml_template('settings', up_to_date=is_up_to_date(), **context)
 
 
 @route('/system_info')
@@ -369,7 +392,7 @@ def system_info():
     uptime_in_seconds = uptime()
     system_uptime = timedelta(seconds=uptime_in_seconds)
 
-    return haml_template('system_info', viewlog=viewlog, loadavg=loadavg, free_space=free_space, uptime=system_uptime, display_info=display_info)
+    return haml_template('system_info', viewlog=viewlog, loadavg=loadavg, free_space=free_space, uptime=system_uptime, display_info=display_info, up_to_date=is_up_to_date())
 
 
 @route('/splash_page')

views/index.haml

@@ -117,10 +117,11 @@
             %span OSE
 
           %ul.nav.pull-right
-            / %li.update-available
-            /   %a(href="#")
-            /     %i.icon-circle-arrow-down.icon-white
-            /     Update Available
+            - if not up_to_date:
+              %li.update-available
+                %a(href="#")
+                  %i.icon-circle-arrow-down.icon-white
+                  Update Available
             %li
               %a(href="/settings")
                 %i.icon-cog.icon-white

views/settings.haml

@@ -31,10 +31,11 @@
             %span OSE
 
           %ul.nav.pull-right
-            / %li.update-available
-            /   %a(href="#")
-            /     %i.icon-circle-arrow-down.icon-white
-            /     Update Available
+            - if not up_to_date:
+              %li.update-available
+                %a(href="#")
+                  %i.icon-circle-arrow-down.icon-white
+                  Update Available
             %li
               %a(href="/settings")
                 %i.icon-cog.icon-white

views/system_info.haml

@@ -31,10 +31,11 @@
             %span OSE
 
           %ul.nav.pull-right
-            / %li.update-available
-            /   %a(href="#")
-            /     %i.icon-circle-arrow-down.icon-white
-            /     Update Available
+            - if not up_to_date:
+              %li.update-available
+                %a(href="#")
+                  %i.icon-circle-arrow-down.icon-white
+                  Update Available
             %li
               %a(href="/settings")
                 %i.icon-cog.icon-white