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Implement --utc switch to force UTC time (closes #155)

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This commit is contained in:
oddlama
2022-07-04 22:18:45 +02:00
committed by DatuX
parent 0b587b3800
commit 78d7dbab6d
9 changed files with 43 additions and 19 deletions
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4
zfs_autobackup/CliBase.py
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@ -80,6 +80,8 @@ class CliBase(object):
help='show zfs progress output. Enabled automaticly on ttys. (use --no-progress to disable)')
group.add_argument('--no-progress', action='store_true',
help=argparse.SUPPRESS) # needed to workaround a zfs recv -v bug
group.add_argument('--utc', action='store_true',
help='Use UTC instead of local time when dealing with timestamps for both formatting and parsing. To snapshot in an ISO 8601 compliant time format you may for example specify --snapshot-format "%Y-%m-%dT%H:%M:%SZ". Changing this parameter after-the-fact (existing snapshots) will cause their timestamps to be interpreted as a different time than before.')
group.add_argument('--version', action='store_true',
help='Show version.')
@ -106,4 +108,4 @@ class CliBase(object):
def set_title(self, title):
self.log.verbose("")
self.log.verbose("#### " + title)
self.log.verbose("#### " + title)

1
zfs_autobackup/ZfsAuto.py
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@ -61,6 +61,7 @@ class ZfsAuto(CliBase):
self.verbose("")
self.verbose("Selecting dataset property : {}".format(self.property_name))
self.verbose("Snapshot format : {}".format(self.snapshot_time_format))
self.verbose("Timezone : {}".format("UTC" if args.utc else "Local"))
return args

11
zfs_autobackup/ZfsAutobackup.py
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@ -1,6 +1,7 @@
import time
import argparse
from datetime import datetime
from signal import signal, SIGPIPE
from .util import output_redir, sigpipe_handler
@ -12,7 +13,6 @@ from .Thinner import Thinner
from .ZfsDataset import ZfsDataset
from .ZfsNode import ZfsNode
from .ThinnerRule import ThinnerRule
import os.path
class ZfsAutobackup(ZfsAuto):
"""The main zfs-autobackup class. Start here, at run() :)"""
@ -435,7 +435,8 @@ class ZfsAutobackup(ZfsAuto):
source_thinner = None
else:
source_thinner = Thinner(self.args.keep_source)
source_node = ZfsNode(snapshot_time_format=self.snapshot_time_format, hold_name=self.hold_name, logger=self,
source_node = ZfsNode(utc=self.args.utc,
snapshot_time_format=self.snapshot_time_format, hold_name=self.hold_name, logger=self,
ssh_config=self.args.ssh_config,
ssh_to=self.args.ssh_source, readonly=self.args.test,
debug_output=self.args.debug_output, description=description, thinner=source_thinner)
@ -454,7 +455,8 @@ class ZfsAutobackup(ZfsAuto):
################# snapshotting
if not self.args.no_snapshot:
self.set_title("Snapshotting")
snapshot_name = time.strftime(self.snapshot_time_format)
dt = datetime.utcnow() if self.args.utc else datetime.now()
snapshot_name = dt.strftime(self.snapshot_time_format)
source_node.consistent_snapshot(source_datasets, snapshot_name,
min_changed_bytes=self.args.min_change,
pre_snapshot_cmds=self.args.pre_snapshot_cmd,
@ -471,7 +473,8 @@ class ZfsAutobackup(ZfsAuto):
target_thinner = None
else:
target_thinner = Thinner(self.args.keep_target)
target_node = ZfsNode(snapshot_time_format=self.snapshot_time_format, hold_name=self.hold_name,
target_node = ZfsNode(utc=self.args.utc,
snapshot_time_format=self.snapshot_time_format, hold_name=self.hold_name,
logger=self, ssh_config=self.args.ssh_config,
ssh_to=self.args.ssh_target,
readonly=self.args.test, debug_output=self.args.debug_output,

6
zfs_autobackup/ZfsAutoverify.py
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@ -231,7 +231,8 @@ class ZfsAutoverify(ZfsAuto):
self.set_title("Source settings")
description = "[Source]"
source_node = ZfsNode(snapshot_time_format=self.snapshot_time_format, hold_name=self.hold_name, logger=self,
source_node = ZfsNode(utc=self.args.utc,
snapshot_time_format=self.snapshot_time_format, hold_name=self.hold_name, logger=self,
ssh_config=self.args.ssh_config,
ssh_to=self.args.ssh_source, readonly=self.args.test,
debug_output=self.args.debug_output, description=description)
@ -249,7 +250,8 @@ class ZfsAutoverify(ZfsAuto):
# create target_node
self.set_title("Target settings")
target_node = ZfsNode(snapshot_time_format=self.snapshot_time_format, hold_name=self.hold_name,
target_node = ZfsNode(utc=self.args.utc,
snapshot_time_format=self.snapshot_time_format, hold_name=self.hold_name,
logger=self, ssh_config=self.args.ssh_config,
ssh_to=self.args.ssh_target,
readonly=self.args.test, debug_output=self.args.debug_output,

2
zfs_autobackup/ZfsCheck.py
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@ -18,7 +18,7 @@ class ZfsCheck(CliBase):
# NOTE: common options argument parsing are in CliBase
super(ZfsCheck, self).__init__(argv, print_arguments)
self.node = ZfsNode(self.log, readonly=self.args.test, debug_output=self.args.debug_output)
self.node = ZfsNode(self.log, utc=self.args.utc, readonly=self.args.test, debug_output=self.args.debug_output)
self.block_hasher = BlockHasher(count=self.args.count, bs=self.args.block_size, skip=self.args.skip)

21
zfs_autobackup/ZfsDataset.py
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@ -1,4 +1,6 @@
import re
from datetime import datetime
import sys
import time
from .CachedProperty import CachedProperty
@ -375,9 +377,22 @@ class ZfsDataset:
"""get timestamp from snapshot name. Only works for our own snapshots
with the correct format.
"""
time_secs = time.mktime(time.strptime(self.snapshot_name, self.zfs_node.snapshot_time_format))
return time_secs
dt = datetime.strptime(self.snapshot_name, self.zfs_node.snapshot_time_format)
if sys.version_info[0] >= 3:
from datetime import timezone
if self.zfs_node.utc:
dt = dt.replace(tzinfo=timezone.utc)
seconds = dt.timestamp()
else:
# python2 has no good functions to deal with UTC. Yet the unix timestamp
# must be in UTC to allow comparison against `time.time()` in on other parts
# of this project (e.g. Thinner.py). If we are handling UTC timestamps,
# we must adjust for that here.
if self.zfs_node.utc:
seconds = (dt - datetime(1970, 1, 1)).total_seconds()
else:
seconds = time.mktime(dt.timetuple())
return seconds
def from_names(self, names):
"""convert a list of names to a list ZfsDatasets for this zfs_node

3
zfs_autobackup/ZfsNode.py
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@ -17,10 +17,11 @@ from .ExecuteNode import ExecuteError
class ZfsNode(ExecuteNode):
"""a node that contains zfs datasets. implements global (systemwide/pool wide) zfs commands"""
def __init__(self, logger, snapshot_time_format="", hold_name="", ssh_config=None, ssh_to=None, readonly=False,
def __init__(self, logger, utc=False, snapshot_time_format="", hold_name="", ssh_config=None, ssh_to=None, readonly=False,
description="",
debug_output=False, thinner=None):
self.utc = utc
self.snapshot_time_format = snapshot_time_format
self.hold_name = hold_name