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Add a backend-specific env var for the GCS backend.

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Right now, the only environment variable available is the same
environment variable that will be picked up by the GCP provider. Users
would like to be able to store state in separate projects or accounts or
otherwise authenticate to the provider with a service account that
doesn't have access to the state. This seems like a reasonable enough
practice to me, and the solution seems straightforward--offer an
environment variable that doesn't mean anything to the provider to
configure the backend credentials. I've added GOOGLE_BACKEND_CREDENTIALS
to manage just the backend credentials, and documented it appropriately.
This commit is contained in:
Paddy Carver 2019-12-12 03:35:39 -08:00
parent bfbd00a23c
commit b8752c7610
2 changed files with 26 additions and 12 deletions
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2
backend/remote-state/gcs/backend.go
View File

@ -136,6 +136,8 @@ func (b *Backend) configure(ctx context.Context) error {
})
} else if v, ok := data.GetOk("credentials"); ok {
creds = v.(string)
} else if v := os.Getenv("GOOGLE_BACKEND_CREDENTIALS"); v != "" {
creds = v
} else {
creds = os.Getenv("GOOGLE_CREDENTIALS")
}

36
website/docs/backends/types/gcs.html.md
View File

@ -52,15 +52,27 @@ resource "template_file" "bar" {
The following configuration options are supported:
* `bucket` - (Required) The name of the GCS bucket.
This name must be globally unique.
For more information, see [Bucket Naming Guidelines](https://cloud.google.com/storage/docs/bucketnaming.html#requirements).
* `credentials` / `GOOGLE_CREDENTIALS` - (Optional) Local path to Google Cloud Platform account credentials in JSON format.
If unset, [Google Application Default Credentials](https://developers.google.com/identity/protocols/application-default-credentials) are used.
The provided credentials need to have the `devstorage.read_write` scope and `WRITER` permissions on the bucket.
* `access_token` - (Optional) A temporary [OAuth 2.0 access token] obtained from
the Google Authorization server, i.e. the `Authorization: Bearer` token used to
authenticate HTTP requests to GCP APIs. This is an alternative to `credentials`. If both are specified, `access_token` will be used over the `credentials` field.
* `prefix` - (Optional) GCS prefix inside the bucket. Named states for workspaces are stored in an object called `<prefix>/<name>.tfstate`.
* `path` - (Deprecated) GCS path to the state file of the default state. For backwards compatibility only, use `prefix` instead.
* `encryption_key` / `GOOGLE_ENCRYPTION_KEY` - (Optional) A 32 byte base64 encoded 'customer supplied encryption key' used to encrypt all state. For more information see [Customer Supplied Encryption Keys](https://cloud.google.com/storage/docs/encryption#customer-supplied).
* `bucket` - (Required) The name of the GCS bucket. This name must be
globally unique. For more information, see [Bucket Naming
Guidelines](https://cloud.google.com/storage/docs/bucketnaming.html#requirements).
* `credentials` / `GOOGLE_BACKEND_CREDENTIALS` / `GOOGLE_CREDENTIALS` -
(Optional) Local path to Google Cloud Platform account credentials in JSON
format. If unset, [Google Application Default
Credentials](https://developers.google.com/identity/protocols/application-default-credentials)
are used. The provided credentials need to have the
`devstorage.read_write` scope and `WRITER` permissions on the bucket.
**Warning**: if using the Google Cloud Platform provider as well, it will
also pick up the `GOOGLE_CREDENTIALS` environment variable.
* `access_token` - (Optional) A temporary [OAuth 2.0 access token] obtained
from the Google Authorization server, i.e. the `Authorization: Bearer` token
used to authenticate HTTP requests to GCP APIs. This is an alternative to
`credentials`. If both are specified, `access_token` will be used over the
`credentials` field.
* `prefix` - (Optional) GCS prefix inside the bucket. Named states for
workspaces are stored in an object called `<prefix>/<name>.tfstate`.
* `path` - (Deprecated) GCS path to the state file of the default state. For
backwards compatibility only, use `prefix` instead.
* `encryption_key` / `GOOGLE_ENCRYPTION_KEY` - (Optional) A 32 byte base64
encoded 'customer supplied encryption key' used to encrypt all state. For
more information see [Customer Supplied Encryption
Keys](https://cloud.google.com/storage/docs/encryption#customer-supplied).