From ea31ce7efbebfab8323a625f6ab72688ff2b0315 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sat, 19 Feb 2022 18:26:34 +0100
Subject: zfssnap: ...

---
 modules/zfssnap/zfssnap.py | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

(limited to 'modules/zfssnap/zfssnap.py')

diff --git a/modules/zfssnap/zfssnap.py b/modules/zfssnap/zfssnap.py
index 83d30a6b..4e7188f9 100644
--- a/modules/zfssnap/zfssnap.py
+++ b/modules/zfssnap/zfssnap.py
@@ -16,7 +16,7 @@ import logging
 
 import shlex
 
-from collections import defaultdict, OrderedDict, deque
+from collections import defaultdict, OrderedDict, deque, namedtuple
 
 import configparser
 from xdg import BaseDirectory
@@ -56,6 +56,7 @@ def _get_items():
 def prune(config, dry_run, keep_newest):
     items = defaultdict(list)
 
+    Snap = namedtuple(Snap, ['name', 'creation'])
     args = ['zfs', 'get', '-H', '-p', '-o', 'name,value', '-t', 'snapshot', 'creation']
     _log_cmd(*args)
     with subprocess.Popen(args, stdout=subprocess.PIPE) as proc:
@@ -70,7 +71,7 @@ def prune(config, dry_run, keep_newest):
             if expected_name != name:
                 # logger.debug(f'Skipping ‘{name}’ since it does not conform to naming scheme')
                 continue
-            items[base_name].append({'name': name, 'creation': creation})
+            items[base_name].append(Snap(name=name, creation=creation))
 
     keep = set()
     kept_count = defaultdict(lambda: defaultdict(lambda: 0))
@@ -84,17 +85,17 @@ def prune(config, dry_run, keep_newest):
     within = config.gettimedelta('KEEP', 'within')
     if within > timedelta(seconds=0):
         for base, snaps in items.items():
-            time_ref = max(snaps, key=lambda snap: snap['creation'], default=None)
+            time_ref = max(snaps, key=lambda snap: snap.creation, default=None)
             if not time_ref:
                 logger.warn(f'Nothing to keep for ‘{base}’')
                 continue
 
             logger.info(f'Using ‘{time_ref["name"]}’ as time reference for ‘{base}’')
-            within_cutoff = time_ref['creation'] - within
+            within_cutoff = time_ref.creation - within
 
             for snap in snaps:
-                if snap['creation'] >= within_cutoff:
-                    keep_because(base, snap['name'], 'within')
+                if snap.creation >= within_cutoff:
+                    keep_because(base, snap.name, 'within')
     else:
         logger.warn('Skipping rule ‘within’ since retention period is zero')
 
@@ -117,8 +118,8 @@ def prune(config, dry_run, keep_newest):
         for base, snaps in items.items():
             periods = OrderedDict()
             
-            for snap in sorted(snaps, key=lambda snap: snap['creation'], reverse=keep_newest):
-                period = pattern(snap['creation'])
+            for snap in sorted(snaps, key=lambda snap: snap.creation, reverse=keep_newest):
+                period = pattern(snap.creation)
                 if period not in periods:
                     periods[period] = deque()
                 periods[period].append(snap)
@@ -130,14 +131,14 @@ def prune(config, dry_run, keep_newest):
                     break
 
                 for snap in period_snaps:
-                    keep_because(base, snap['name'], rule, period=period)
+                    keep_because(base, snap.name, rule, period=period)
                     to_keep -= 1
                     break
 
             if to_keep > 0:
                 logger.debug(f'Missing {to_keep} to fulfill {rule}={desired_count} for ‘{base}’')
 
-    all_snaps = {snap['name'] for _, snaps in items.items() for snap in snaps}
+    all_snaps = {snap.name for _, snaps in items.items() for snap in snaps}
     to_destroy = all_snaps - keep
     if not to_destroy:
         logger.info('Nothing to prune')
-- 
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