Azure.Core & Azure.Identity needs to be updated to support env vars

[joshfree]

The environment variables identified in https://github.com/Azure/azure-sdk/blob/master/_includes/tables/environment_variables.md such as

Environment Variable	Purpose
Proxy Settings
HTTP_PROXY	Proxy for HTTP connections
HTTPS_PROXY	Proxy for HTTPS connections
NO_PROXY	Hosts which must not use a proxy
Identity
MSI_ENDPOINT	Azure AD MSI Credentials
MSI_SECRET	Azure AD MSI Credentials
AZURE_SUBSCRIPTION_ID	Azure subscription
AZURE_USERNAME	Azure username for U/P Auth
AZURE_PASSWORD	Azure password for U/P Auth
AZURE_CLIENT_CERTIFICATE_PATH	Azure Active Directory
AZURE_CLIENT_ID	Azure Active Directory
AZURE_CLIENT_SECRET	Azure Active Directory
AZURE_TENANT_ID	Azure Active Directory
AZURE_RESOURCE_GROUP	Azure Resource Group
AZURE_CLOUD	Name of the sovereign cloud
Pipeline Configuration
AZURE_TELEMETRY_DISABLED	Disables telemetry
AZURE_LOG_LEVEL	Enable logging by setting a log level.
AZURE_TRACING_DISABLED	Disables tracing
AZURE_AUTHORITY_HOST	Azure Active Directory

• ManagedIdentityCredential - AZURE_CLIENT_ID

• TokenCredentialOptions - AZURE_AUTHORITY_HOST

need to be reviewed, supported, and tested for our Azure.Core and Azure.Identity. There are at least some of these not currently properly supported, such as AZURE_CLOUD for example.

[ramya-rao-a]

Looks like #7069 will handle the NO_PROXY env var.
#10205 is tracking AZURE_TRACING_DISABLED

Do we know how we expect Azure Core to respect the below?
I would expect this to be handled by individual libraries.

• AZURE_SUBSCRIPTION_ID
• AZURE_RESOURCE_GROUP
• AZURE_CLOUD
• AZURE_AUTHORITY_HOST

For AZURE_TELEMETRY_DISABLED, am guessing we disable the user agent policy?

cc @xirzec

[sadasant]

Question,

Is AZURE_CLOUD the same as AZURE_AUTHORITY_HOST?

[sadasant]

To update this with an answer to my question, I asked my question above to @schaabs over a private channel and his response was more or less the following:

AZURE_CLOUD impacts a bunch of endpoints such as the Arm endpoint, the default authority and others [...] it requires a deeper design that we haven't really gotten any guidance from the archboard on this yet

[Marcus-James-Adams]

Is there an update as to when support for AZURE_SUBSCRIPTION_ID will be supported?

[xirzec]

Is there an update as to when support for AZURE_SUBSCRIPTION_ID will be supported?

@Marcus-James-Adams can you help me to understand where you would like to use AZURE_SUBSCRIPTION_ID? Are you trying to avoid having to retrieve the value from the environment manually when using a ResourceManagementClient?

It's not clear to me how Core / Identity can make use of this information at the moment.

[github-actions]

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