Read the current edx-platform git revision from a file on disk

cms/envs/bok_choy.py

@@ -33,6 +33,7 @@ os.environ['CONFIG_ROOT'] = path(__file__).abspath().dirname()
 os.environ['STUDIO_CFG'] = str.format("{config_root}/{service_variant}.yml",
                                       config_root=os.environ['CONFIG_ROOT'],
                                       service_variant=os.environ['SERVICE_VARIANT'])
+os.environ['REVISION_CFG'] = "{config_root}/revisions.yml".format(config_root=os.environ['CONFIG_ROOT'])
 
 from .production import *  # pylint: disable=wildcard-import, unused-wildcard-import, wrong-import-position
 

cms/envs/production.py

@@ -45,6 +45,18 @@ with codecs.open(CONFIG_FILE, encoding='utf-8') as f:
     AUTH_TOKENS = __config__
 
 
+# A file path to a YAML file from which to load all the code revisions currently deployed
+REVISION_CONFIG_FILE = get_env_setting('REVISION_CFG')
+
+try:
+    with codecs.open(REVISION_CONFIG_FILE, encoding='utf-8') as f:
+        REVISION_CONFIG = yaml.safe_load(f)
+except Exception:  # pylint: disable=broad-except
+    REVISION_CONFIG = {}
+
+# Do NOT calculate this dynamically at startup with git because it's *slow*.
+EDX_PLATFORM_REVISION = REVISION_CONFIG.get('EDX_PLATFORM_REVISION', EDX_PLATFORM_REVISION)
+
 # SERVICE_VARIANT specifies name of the variant used, which decides what JSON
 # configuration files are read during startup.
 SERVICE_VARIANT = os.environ.get('SERVICE_VARIANT', None)
@@ -110,9 +122,6 @@ CELERY_QUEUES = {
 
 CELERY_ROUTES = "{}celery.Router".format(QUEUE_VARIANT)
 
-# Do NOT calculate this dynamically at startup with git because it's *slow*.
-EDX_PLATFORM_REVISION = ENV_TOKENS.get('EDX_PLATFORM_REVISION', EDX_PLATFORM_REVISION)
-
 # STATIC_URL_BASE specifies the base url to use for static files
 STATIC_URL_BASE = ENV_TOKENS.get('STATIC_URL_BASE', None)
 if STATIC_URL_BASE:
@@ -197,6 +206,9 @@ if 'loc_cache' not in CACHES:
         'LOCATION': 'edx_location_mem_cache',
     }
 
+if 'staticfiles' in CACHES:
+    CACHES['staticfiles']['KEY_PREFIX'] = EDX_PLATFORM_REVISION
+
 SESSION_COOKIE_DOMAIN = ENV_TOKENS.get('SESSION_COOKIE_DOMAIN')
 SESSION_COOKIE_HTTPONLY = ENV_TOKENS.get('SESSION_COOKIE_HTTPONLY', True)
 SESSION_ENGINE = ENV_TOKENS.get('SESSION_ENGINE', SESSION_ENGINE)

lms/envs/bok_choy.py

@@ -36,6 +36,7 @@ os.environ['SERVICE_VARIANT'] = 'bok_choy_docker' if 'BOK_CHOY_HOSTNAME' in os.e
 os.environ['CONFIG_ROOT'] = CONFIG_ROOT
 os.environ['LMS_CFG'] = str.format("{config_root}/{service_variant}.yml",
                                    config_root=os.environ['CONFIG_ROOT'], service_variant=os.environ['SERVICE_VARIANT'])
+os.environ['REVISION_CFG'] = "{config_root}/revisions.yml".format(config_root=os.environ['CONFIG_ROOT'])
 
 from .production import *  # pylint: disable=wildcard-import, unused-wildcard-import, wrong-import-position
 

lms/envs/production.py

@@ -56,6 +56,18 @@ with codecs.open(CONFIG_FILE, encoding='utf-8') as f:
     ENV_TOKENS = __config__
     AUTH_TOKENS = __config__
 
+# A file path to a YAML file from which to load all the code revisions currently deployed
+REVISION_CONFIG_FILE = get_env_setting('REVISION_CFG')
+
+try:
+    with codecs.open(REVISION_CONFIG_FILE, encoding='utf-8') as f:
+        REVISION_CONFIG = yaml.safe_load(f)
+except Exception:  # pylint: disable=broad-except
+    REVISION_CONFIG = {}
+
+# Do NOT calculate this dynamically at startup with git because it's *slow*.
+EDX_PLATFORM_REVISION = REVISION_CONFIG.get('EDX_PLATFORM_REVISION', EDX_PLATFORM_REVISION)
+
 # SERVICE_VARIANT specifies name of the variant used, which decides what JSON
 # configuration files are read during startup.
 SERVICE_VARIANT = os.environ.get('SERVICE_VARIANT', None)
@@ -230,6 +242,9 @@ if 'loc_cache' not in CACHES:
         'LOCATION': 'edx_location_mem_cache',
     }
 
+if 'staticfiles' in CACHES:
+    CACHES['staticfiles']['KEY_PREFIX'] = EDX_PLATFORM_REVISION
+
 # Email overrides
 DEFAULT_FROM_EMAIL = ENV_TOKENS.get('DEFAULT_FROM_EMAIL', DEFAULT_FROM_EMAIL)
 DEFAULT_FEEDBACK_EMAIL = ENV_TOKENS.get('DEFAULT_FEEDBACK_EMAIL', DEFAULT_FEEDBACK_EMAIL)
@@ -1057,9 +1072,6 @@ PARENTAL_CONSENT_AGE_LIMIT = ENV_TOKENS.get(
     PARENTAL_CONSENT_AGE_LIMIT
 )
 
-# Do NOT calculate this dynamically at startup with git because it's *slow*.
-EDX_PLATFORM_REVISION = ENV_TOKENS.get('EDX_PLATFORM_REVISION', EDX_PLATFORM_REVISION)
-
 ########################## Extra middleware classes  #######################
 
 # Allow extra middleware classes to be added to the app through configuration.

tox.ini

@@ -37,6 +37,7 @@ passenv =
     EDX_PLATFORM_SETTINGS
     JOB_NAME
     LMS_CFG
+    REVISION_CFG
     MOZ_HEADLESS
     NODE_PATH
     NODE_VIRTUAL_ENV