Create USM upgrade in progress flag

This commit creates a flag to indicate there is an USM
major release deployment (or upgrade) in progress to be
used by other parts of the system to do specific tasks
like provisioning and configuration that are relevant in
this scenario, and this commit also deletes the upgrade
flags in deploy delete.

Test Plan
PASS: (AIO-DX) full major release deployment

Story: 2010676
Task: 50701

Change-Id: Id277d985cdfd7ccf95a63d16910093d7c1fb5761
Signed-off-by: Heitor Matsui <heitorvieira.matsui@windriver.com>

software/software/agent_hooks.py

@@ -113,6 +113,16 @@ class ReconfigureKernelHook(BaseHook):
             LOG.exception(msg)
 
 
+class CreateUSMUpgradeInProgressFlag(BaseHook):
+    def __init__(self, attrs):
+        super().__init__(attrs)
+
+    def run(self):
+        flag_file = constants.USM_UPGRADE_IN_PROGRESS_FLAG
+        with open(flag_file, "w") as _:
+            LOG.info("Created %s flag" % flag_file)
+
+
 # pre and post keywords
 PRE = "pre"
 POST = "post"
@@ -124,7 +134,7 @@ MAJOR_RELEASE_ROLLBACK = "major_release_rollback"
 # agent hooks mapping per action
 AGENT_HOOKS = {
     MAJOR_RELEASE_UPGRADE: {
-        PRE: [],
+        PRE: [CreateUSMUpgradeInProgressFlag],
         POST: [
             CopyPxeFilesHook,
             ReconfigureKernelHook,

software/software/constants.py

@@ -175,5 +175,7 @@ COMMIT_TAG = "commit"
 CHECKSUM_TAG = "checksum"
 COMMIT1_TAG = "commit1"
 
-# install local flag
+# flags
 INSTALL_LOCAL_FLAG = "/opt/software/.install_local"
+USM_UPGRADE_IN_PROGRESS_FLAG = os.path.join(tsc.PLATFORM_CONF_PATH, ".usm_upgrade_in_progress")
+UPGRADE_DO_NOT_USE_FQDN_FLAG = os.path.join(tsc.PLATFORM_CONF_PATH, ".upgrade_do_not_use_fqdn")

software/software/software_functions.py

@@ -1476,6 +1476,17 @@ def clean_up_deployment_data(major_release):
     for folder in upgrade_folders:
         shutil.rmtree(folder, ignore_errors=True)
 
+    upgrade_flags = [
+        constants.USM_UPGRADE_IN_PROGRESS_FLAG,
+        constants.UPGRADE_DO_NOT_USE_FQDN_FLAG,
+    ]
+    for flag in upgrade_flags:
+        try:
+            os.remove(flag)
+            LOG.info("Flag %s removed.")
+        except FileNotFoundError:
+            LOG.warning("Flag %s not found. Skipping...")
+
 
 def run_deploy_clean_up_script(release):
     """