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docs: document unset GOOGLE_APPLICATION_CREDENTIALS

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In case the `GOOGLE_APPLICATION_CREDENTIALS` environment variable is not
set, a redirect to storage.googleapis.com is issued, which means the
underlying bucket objects need to be publicly accessible.

This wasn't really obvious until now, so further clarify it.
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Florian Klink 2021-04-29 16:02:26 +02:00 committed by Vincent Ambo
parent fd3dc4422f
commit 8aef070dc6
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4
README.md
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@ -94,6 +94,10 @@ account key, Nixery will also use this key to create [signed URLs][] for layers
in the storage bucket. This makes it possible to serve layers from a bucket
without having to make them publicly available.
In case the `GOOGLE_APPLICATION_CREDENTIALS` environment variable is not set, a
redirect to storage.googleapis.com is issued, which means the underlying bucket
objects need to be publicly accessible.
### Storage
Nixery supports multiple different storage backends in which its build cache and

4
storage/gcs.go
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@ -222,6 +222,10 @@ func signingOptsFromEnv() (*storage.SignedURLOptions, error) {
// Signing the URL allows unauthenticated clients to retrieve objects from the
// bucket.
//
// In case signing is not configured, a redirect to storage.googleapis.com is
// issued, which means the underlying bucket objects need to be publicly
// accessible.
//
// The Docker client is known to follow redirects, but this might not be true
// for all other registry clients.
func (b *GCSBackend) constructLayerUrl(digest string) (string, error) {