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105 lines
2.3 KiB
Python
Executable File
105 lines
2.3 KiB
Python
Executable File
#!/usr/bin/python3
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# Read http://snapper.io/2025/05/16/rollback-any.html and understand
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# the setup before using this program.
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import subprocess
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import re
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import datetime
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import argparse
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subvolume = "/home"
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def parse_options():
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parser = argparse.ArgumentParser(description = "rollabck home")
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parser.add_argument("number", type = int, help = "rollback to number")
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args = parser.parse_args()
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return args.number
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def find_next_number():
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next_number = 1
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cmd = subprocess.run([ "btrfs", "subvolume", "list", subvolume ], stdout = subprocess.PIPE)
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tmp = cmd.stdout.rstrip().decode("utf-8")
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pattern = f"^@\\{subvolume}\\/\\.snapshots\\/(\\d+)\\/snapshot$"
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for tmp1 in tmp.split('\n'):
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tmp2 = tmp1.split(' ')
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tmp3 = tmp2[8]
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match = re.search(pattern, tmp3)
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if match:
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tmp4 = int(match.group(1)) + 1
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if tmp4 > next_number:
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next_number = tmp4
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print("next number is", next_number)
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return next_number
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def write_info(number):
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template = """<?xml version="1.0"?>
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<snapshot>
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<type>single</type>
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<num>{number}</num>
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<date>{date}</date>
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<description>rollback backup</description>
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</snapshot>
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"""
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data = {
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"number": number,
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"date": datetime.datetime.now(datetime.timezone.utc).strftime("%Y-%m-%d %H:%M:%S")
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}
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filename = subvolume + "/.snapshots/" + str(number) + "/info.xml"
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with open(filename, "w") as f:
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f.write(template.format(**data))
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def step_rename():
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next_number = find_next_number()
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subprocess.run([ "mkdir", subvolume + "/.snapshots/" + str(next_number) ])
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subprocess.run([ "mv", subvolume + "/.snapshots/0/snapshot",
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subvolume + "/.snapshots/" + str(next_number) + "/snapshot" ])
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subprocess.run([ "btrfs", "property", "set",
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subvolume + "/.snapshots/" + str(next_number) + "/snapshot", "ro", "true" ])
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write_info(next_number)
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def step_new_zero(number):
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subprocess.run([ "btrfs", "subvolume", "snapshot",
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subvolume + "/.snapshots/" + str(number) + "/snapshot",
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subvolume + "/.snapshots/0/snapshot" ])
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try:
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number = parse_options()
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except SystemExit:
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pass
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print("rollback to", number)
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step_rename()
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step_new_zero(number)
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