9b606ed5f3
Keep internal documents out of system images while retaining license notices and package versions. Generate boot mappings from a bounded storage inventory, and allow long SSH diagnostics. Hardware boot qualification remains pending.
55 lines
2.2 KiB
Python
55 lines
2.2 KiB
Python
#!/usr/bin/env python3
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# SPDX-License-Identifier: MPL-2.0
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"""Inventory an existing Sargo ext4/LVM mount without changing any storage."""
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import argparse
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import hashlib
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import json
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import os
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from pathlib import Path
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import stat
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import subprocess
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from storage_layout import mount_table
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def command(*args):
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return subprocess.check_output(args, text=True, timeout=15,
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env={**os.environ, 'PATH': '/usr/sbin:/usr/bin:/sbin:/bin', 'LC_ALL': 'C'}).strip()
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def inventory(mountpoint):
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device = Path('/dev/mmcblk0p72')
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if not stat.S_ISBLK(device.stat().st_mode):
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raise ValueError('Sargo userdata block device is missing')
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label = command('blkid', '-s', 'PARTLABEL', '-o', 'value', str(device))
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if label != 'userdata':
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raise ValueError('Unexpected partition label')
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mounted = json.loads(command('findmnt', '--json', '--mountpoint', mountpoint,
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'--output', 'SOURCE,FSTYPE'))['filesystems']
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if len(mounted) != 1 or mounted[0]['fstype'] != 'ext4':
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raise ValueError('Expected one existing ext4 mount')
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source = mounted[0]['source']
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if not source.startswith('/dev/mapper/'):
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raise ValueError('Only the existing single-extent LVM layout is supported')
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table = command('dmsetup', 'table', source)
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with device.open('rb', buffering=0) as stream:
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first = stream.read(1048576)
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if len(first) != 1048576:
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raise ValueError('Cannot read userdata identity')
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layout = {
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'schema': 2, 'device': str(device), 'partitionLabel': label,
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'filesystem': mounted[0]['fstype'], 'table': table,
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'backingDevice': Path('/sys/class/block/mmcblk0p72/dev').read_text().strip(),
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'size': int(command('blockdev', '--getsize64', str(device))),
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'firstMiBSha256': hashlib.sha256(first).hexdigest(),
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}
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mount_table(layout)
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return layout
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if __name__ == '__main__':
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument('--mountpoint', required=True,
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help='Existing root mount, or /reference/installed under Tundra')
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args = parser.parse_args()
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print(json.dumps(inventory(args.mountpoint), indent=2))
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