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https://github.com/KDE/kde-linux.git
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56 lines
2.0 KiB
Python
Executable File
56 lines
2.0 KiB
Python
Executable File
#!/usr/bin/env python3
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# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
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# SPDX-FileCopyrightText: 2024 Harald Sitter <sitter@kde.org>
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# Shrink btrfs. It's a bit awkward because we don't really have a reliable way
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# to calculate how much space we actually need. So we first chop off a dynamic
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# portion but leave a bit of a buffer behind. Then we keep resizing until the
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# resize starts failing.
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import json
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import os
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import math
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import subprocess
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from subprocess import check_output
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os.chdir('root.raw.mnt')
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drive_size = check_output(['findmnt', '--bytes', '--noheadings', '--output', 'size', '.']).strip()
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drive_size = int(drive_size)
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out = check_output(["btrfs", "--format", "json", "filesystem", "df", "."])
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data = json.loads(out)
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df = data["filesystem-df"]
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size = 0
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for block_group in df:
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size += block_group["total"]
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# Give 50% buffer space. We'll shrink from there in smaller steps. Make sure to not blow past the partition size.
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size = min(drive_size, math.ceil(size * 1.5))
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original_size = size
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subprocess.check_call(["btrfs", "filesystem", "resize", str(size), "."])
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# With compression one extent is always 128KiB as per btrfs documentation.
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# extent_size = 128 * 1024
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# For now we use 32MiB as the extent size so as to not slow down the build too much though.
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extent_size = 32 * 1024 * 1024
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while True:
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try:
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subprocess.check_call(["btrfs", "filesystem", "resize", f"-{extent_size}", "."], stdout=subprocess.DEVNULL, stdin=subprocess.DEVNULL)
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subprocess.check_call(["btrfs", "filesystem", "sync", "."])
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size -= extent_size
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except subprocess.CalledProcessError as e:
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print(e)
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break
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# Next we truncate the actual partition file by the according amount. For practical reasons this happens here so we don't
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# have to pass the sizes around between different programs.
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os.chdir('..')
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subprocess.check_call(['umount', 'root.raw.mnt'])
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subprocess.check_call(['truncate', f'--size=-{original_size - size}', 'root.raw'])
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