[3.0] Passed Azure config to toolkit build env. (#14526)

We're adding support for anonymous Azure blob stores in #14494. This change is to help with that work by making the Azure configuration (including login info) exposed during build-time. Since the toolkit requires to be run as root, the user's Azure config is not visible by default, because it's saved under $HOME/.azure and since we're running as root, the home directory is different from the running user's home directory.

Author: PawelWMS

toolkit/Makefile

@@ -201,6 +201,9 @@ all: toolchain go-tools chroot-tools
 # its help will be displayed at the top of the help output.
 include $(SCRIPTS_DIR)/help.mk
 
+# Set-up the Azure configuration for the build
+include $(SCRIPTS_DIR)/azure_config.mk
+
 # Set up for the timestamp feature
 include $(SCRIPTS_DIR)/timestamp.mk
 

toolkit/scripts/azure_config.mk

@@ -0,0 +1,9 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+# By default pass original user's Azure configuration if running as root.
+# Running as root is required by how the toolkit operates while
+# in most cases the user expects to still use their Azure configuration, thus the default.
+ifneq ($(SUDO_USER),)
+	export AZURE_CONFIG_DIR ?= $(shell sudo -u "$(SUDO_USER)" bash -c 'echo $${AZURE_CONFIG_DIR:-$${HOME}/.azure}')
+endif