Fix backup/restore procedure

- Restore the "active from" timestamp
- Add to backup/restore the "active to" timestamp

imageroot/actions/restore-module/06copyenv

@@ -1,28 +1,14 @@
 #!/usr/bin/env python3
 
 #
-# Copyright (C) 2022 Nethesis S.r.l.
-# http://www.nethesis.it - nethserver@nethesis.it
-#
-# This script is part of NethServer.
-#
-# NethServer is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License,
-# or any later version.
-#
-# NethServer is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with NethServer.  If not, see COPYING.
+# Copyright (C) 2024 Nethesis S.r.l.
+# SPDX-License-Identifier: GPL-3.0-or-later
 #
 
 import sys
 import json
 import agent
+import os
 
 request = json.load(sys.stdin)
 
@@ -33,5 +19,8 @@ for evar in [
         "LOKI_API_AUTH_PASSWORD",
         "LOKI_LOGS_INGRESS_TOKEN",
         "LOKI_RETENTION_PERIOD",
+        "LOKI_ACTIVE_FROM",
     ]:
     agent.set_env(evar, original_environment[evar])
+
+# NOTE: LOKI_ACTIVE_TO is value restored after restic run

imageroot/actions/restore-module/95restore_active_to

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+
+#
+# Copyright (C) 2024 Nethesis S.r.l.
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+
+import sys
+import json
+import agent
+import subprocess
+
+try:
+    # Find the biggest modification timestamp among Loki's subdirs,
+    # and print it in ISO8601 format. Note that the timezone requires
+    # the ":" separator, otherwise the parsing fails.
+    find_latest_change_script = """find /loki -type d |
+        xargs -- stat -c %Y |
+        awk 'BEGIN { ts = 0 } ; { ts = $1 > ts ? $1 : ts ; } ; END { print ts }' |
+        xargs -IDATE -- date -u -d @DATE +%Y-%m-%dT%H:%M:%S.0+00:00
+    """
+    proc_active_to = subprocess.run(["podman", "exec", "-i", "loki-server", "ash", "-s"],
+        capture_output=True,
+        input=find_latest_change_script,
+        text=True,
+        check=True,
+    )
+except Exception as ex:
+    print(agent.SD_WARNING + "Cannot restore LOKI_ACTIVE_TO:", str(ex), file=sys.stderr)
+else:
+    agent.set_env("LOKI_ACTIVE_TO", proc_active_to.stdout.strip())