feat(tools): adds an update scenario for all targets

This change adds a new function that describes the
main update scenario. It handles multiple hosts and
then runs an update on each of them.
Basically, it is the kind of function that can be
called directly from a CLI.

Signed-off-by: Olivier Hoareau <olivier.hoareau@vates.tech>

Author: olivierh-pro

lib/tools/tasks/update.py

@@ -2,13 +2,37 @@
 
 This module is intended for performing update actions on existing remote targets.
 """
+from concurrent.futures import ThreadPoolExecutor
 
+from lib.common import HostAddress
 from lib.host import Host
+from lib.pool import Pool
 
 from .. import logger
 
 from typing import List
 
+def update_all(master_hosts: List[HostAddress], enablerepos: List[str]) -> None:
+    """Updates all master (primary) hosts.
+
+    .. note:: Host must be a master
+
+        Throws error if hosts are not master (primary).
+
+    :param :py:class:`List[lib.common.HostAddress]` master_hosts:
+        A list of hosts to update.
+    :param List[str] enablerepos:
+        Enable one or more repo(s) when updating.
+    """
+    logger.debug(f"[{master_hosts}] enablerepos: {enablerepos}")
+    # init related pools
+    pools = [Pool(h) for h in master_hosts]
+
+    with ThreadPoolExecutor() as executor:
+        for p in pools:
+            executor.submit(update_host, p.master, enablerepos)
+
+
 def update_host(host: Host, enablerepos: List[str] = []):
     """Updates the target host.