commit 8ffb4d3e832607869026444e5a071c5f3e225fd2
author chenyumic <chenyumic@google.com> Thu Jun 04 10:14:05 2020 -0700
committer GitHub <noreply@github.com> Thu Jun 04 17:14:05 2020 +0000
tree b237e32022c55917b204f60758997a3fda4ddf45
parent 9d5a9a9884fecbd698a602d2a9fd9bec6b987de7

fix: replace environment variable GCE_METADATA_ROOT with GCE_METADATA_HOST (#433)

…_HOST

* keeps consistent naming across auth packages of all languages.

    The package will now check GCE_METADATA_HOST (the new name) first; if not present, it falls back to GCE_METADATA_ROOT (the old name), then the default value.

closes [#339](https://github.com/googleapis/google-auth-library-python/issues/339).

google/auth/environment_vars.py

diff --git a/google/auth/environment_vars.py b/google/auth/environment_vars.py
index 6a596f2..9c1367f 100644
--- a/google/auth/environment_vars.py
+++ b/google/auth/environment_vars.py
@@ -40,9 +40,15 @@
 
 # These two variables allow for customization of the addresses used when
 # contacting the GCE metadata service.
+GCE_METADATA_HOST = "GCE_METADATA_HOST"
 GCE_METADATA_ROOT = "GCE_METADATA_ROOT"
 """Environment variable providing an alternate hostname or host:port to be
-used for GCE metadata requests."""
+used for GCE metadata requests.
+
+This environment variable is originally named GCE_METADATA_ROOT. System will
+check the new variable first; should there be no value present,
+the system falls back to the old variable.
+"""
 
 GCE_METADATA_IP = "GCE_METADATA_IP"
 """Environment variable providing an alternate ip:port to be used for ip-only