16636: Merge branch 'master' into 16636-more-metrics

[arvados.git] / sdk / python / arvados / util.py

diff --git a/sdk/python/arvados/util.py b/sdk/python/arvados/util.py
index fd29a3dc1d46938d2ea9e5c661bea2cbf20659be..6c9822e9f0325ec82cf68dc413843a9499755942 100644 (file)
--- a/sdk/python/arvados/util.py
+++ b/sdk/python/arvados/util.py
@@ -396,6 +396,9 @@ def ca_certs_path(fallback=httplib2.CA_CERTS):
     it returns the value of `fallback` (httplib2's CA certs by default).
     """
     for ca_certs_path in [
+        # SSL_CERT_FILE and SSL_CERT_DIR are openssl overrides - note
+        # that httplib2 itself also supports HTTPLIB2_CA_CERTS.
+        os.environ.get('SSL_CERT_FILE'),
         # Arvados specific:
         '/etc/arvados/ca-certificates.crt',
         # Debian:
@@ -403,7 +406,7 @@ def ca_certs_path(fallback=httplib2.CA_CERTS):
         # Red Hat:
         '/etc/pki/tls/certs/ca-bundle.crt',
         ]:
-        if os.path.exists(ca_certs_path):
+        if ca_certs_path and os.path.exists(ca_certs_path):
             return ca_certs_path
     return fallback
 
@@ -419,3 +422,11 @@ def new_request_id():
             rid += chr(c+ord('a')-10)
         n = n // 36
     return rid
+
+def get_config_once(svc):
+    if not svc._rootDesc.get('resources').get('configs', False):
+        # Old API server version, no config export endpoint
+        return {}
+    if not hasattr(svc, '_cached_config'):
+        svc._cached_config = svc.configs().get().execute()
+    return svc._cached_config