Hotfix: update the logic to get path of access tokens. (#198)

* Hotfix: update the logic to get path of access tokens.

1. Add logic to read path of access tokens through environment variable.
2. Add fallback logic to default one.

Notice: this is short-term fix and require user to use latest version of provider in Cloud Shell.

* add missed package caused by Go extension in VS Code.

* Update TODO with issue# and update the changelog.md.

CHANGELOG.md

@@ -1,5 +1,12 @@
 # CHANGELOG
 
+## v9.4.1
+
+### Bug Fixes
+
+- Update the AccessTokensPath() to read access tokens path through AZURE_ACCESS_TOKEN_FILE. If this
+environment variable is not set, it will fall back to use default path set by Azure CLI.
+
 ## v9.4.0
 
 ### New Features

autorest/azure/cli/token.go

@@ -62,8 +62,19 @@ func (t Token) ToADALToken() (converted adal.Token, err error) {
 }
 
 // AccessTokensPath returns the path where access tokens are stored from the Azure CLI
+// TODO(#199): add unit test.
 func AccessTokensPath() (string, error) {
-	return homedir.Expand("~/.azure/accessTokens.json")
+	// Azure-CLI allows user to customize the path of access tokens thorugh environment variable.
+	var accessTokenPath = os.Getenv("AZURE_ACCESS_TOKEN_FILE")
+	var err error
+
+	// Fallback logic to default path on non-cloud-shell environment.
+	// TODO(#200): remove the dependency on hard-coding path.
+	if accessTokenPath == "" {
+		accessTokenPath, err = homedir.Expand("~/.azure/accessTokens.json")
+	}
+
+	return accessTokenPath, err
 }
 
 // ParseExpirationDate parses either a Azure CLI or CloudShell date into a time object