mirror of
https://github.com/freedombox/FreedomBox.git
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81fde34254
- Rename Disks to Storage - Rename Snapshot to Storage Snapshots Reviewed-by: Joseph Nuthalapati <njoseph@thoughtworks.com>
233 lines
8.1 KiB
Python
Executable File
233 lines
8.1 KiB
Python
Executable File
#!/usr/bin/python3
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#
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# This file is part of Plinth.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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"""
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Configuration helper for disks manager.
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"""
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import argparse
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import re
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import subprocess
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import sys
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def parse_arguments():
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"""Return parsed command line arguments as dictionary."""
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parser = argparse.ArgumentParser()
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subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')
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subparser = subparsers.add_parser(
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'is-partition-expandable',
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help='Return whether a given partition can be expanded')
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subparser.add_argument(
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'device', help='Partition for which check needs to be performed')
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subparser = subparsers.add_parser(
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'expand-partition',
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help='Expand a partition to take adjacent free space')
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subparser.add_argument(
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'device', help='Partition which needs to be resized')
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subparsers.required = True
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return parser.parse_args()
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def subcommand_is_partition_expandable(arguments):
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"""Return a list of partitions that can be expanded."""
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_, _, free_space = _get_free_space(arguments.device)
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print(free_space['size'])
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def subcommand_expand_partition(arguments):
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"""Expand a partition to take adjacent free space."""
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device = arguments.device
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device, requested_partition, free_space = _get_free_space(device)
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if requested_partition['table_type'] == 'msdos' and \
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int(requested_partition['number']) >= 5:
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print('Expanding logical partitions currently unsupported',
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file=sys.stderr)
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sys.exit(4)
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_resize_partition(device, requested_partition, free_space)
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_resize_file_system(device, requested_partition, free_space)
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def _resize_partition(device, requested_partition, free_space):
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"""Resize the partition table entry."""
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command = ['parted', '--align=optimal', '--script', device, 'unit', 'B',
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'resizepart', requested_partition['number'],
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str(free_space['end'])]
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# XXX: Remove workaround after bug in parted is fixed:
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# https://debbugs.gnu.org/cgi/bugreport.cgi?bug=24215
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fallback_command = ['parted', '--align=optimal', device,
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'---pretend-input-tty', 'unit', 'B', 'resizepart',
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requested_partition['number'], 'yes',
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str(free_space['end'])]
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try:
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subprocess.run(command, check=True)
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except subprocess.CalledProcessError as exception:
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try:
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subprocess.run(fallback_command, check=True)
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except subprocess.CalledProcessError as exception:
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print('Error expanding partition:', exception, file=sys.stderr)
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sys.exit(5)
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def _resize_file_system(device, requested_partition, free_space):
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"""Resize a file system inside a partition."""
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if requested_partition['type'] == 'btrfs':
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_resize_btrfs(device, requested_partition, free_space)
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elif requested_partition['type'] == 'ext4':
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_resize_ext4(device, requested_partition, free_space)
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def _resize_ext4(device, requested_partition, free_space):
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"""Resize an ext4 file system inside a partition."""
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partition_device = _get_partition_device(
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device, requested_partition['number'])
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try:
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command = ['resize2fs', partition_device]
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subprocess.run(command, stdout=subprocess.DEVNULL,
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stderr=subprocess.DEVNULL, check=True)
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except subprocess.CalledProcessError as exception:
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print('Error expanding filesystem:', exception, file=sys.stderr)
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sys.exit(6)
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def _resize_btrfs(device, requested_partition, free_space):
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"""Resize a btrfs file system inside a partition."""
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try:
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command = ['btrfs', 'filesystem', 'resize', 'max', '/']
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subprocess.run(command, stdout=subprocess.DEVNULL, check=True)
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except subprocess.CalledProcessError as exception:
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print('Error expanding filesystem:', exception, file=sys.stderr)
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sys.exit(6)
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def _get_free_space(device):
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"""Return the amount of free space after a partition."""
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device, partition_number = \
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_get_root_device_and_partition_number(device)
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try:
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requested_partition, free_spaces = \
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_get_partitions_and_free_spaces(device, partition_number)
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except Exception as exception:
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print('Error getting partition details: ', exception, file=sys.stderr)
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sys.exit(2)
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# Don't accept extended partitions for now
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if requested_partition['table_type'] == 'msdos' and \
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int(requested_partition['number']) >= 5:
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print('Expanding logical partitions currently unsupported',
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file=sys.stderr)
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sys.exit(3)
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# Don't accept anything but btrfs and ext4 filesystems
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if requested_partition['type'] not in ('btrfs', 'ext4'):
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print('Unsupported file system type: ', requested_partition['type'],
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file=sys.stderr)
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sys.exit(4)
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found_free_space = None
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for free_space in free_spaces:
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if free_space['start'] != requested_partition['end'] + 1:
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continue
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if free_space['size'] < 10 * 1024 * 1024: # Minimum 10MiB
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continue
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found_free_space = free_space
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if not found_free_space:
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sys.exit(5)
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return device, requested_partition, found_free_space
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def _get_partition_device(device, partition_number):
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"""Return the device corresponding to a parition in a given device."""
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if re.match('[0-9]', device[-1]):
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return device + 'p' + str(partition_number)
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return device + str(partition_number)
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def _get_root_device_and_partition_number(device):
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"""Return the parent device and number of partition separately."""
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match = re.match('(.+[a-zA-Z]\d+)p(\d+)$', device)
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if not match:
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match = re.match('(.+[a-zA-Z])(\d+)$', device)
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if not match:
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print('Invalid device, must be a partition', file=sys.stderr)
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sys.exit(1)
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return match.group(1), match.group(2)
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def _get_partitions_and_free_spaces(device, partition_number):
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"""Run parted and return list of partitions and free spaces."""
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command = ['parted', '--machine', '--script', device, 'unit', 'B',
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'print', 'free']
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process = subprocess.run(command, stdout=subprocess.PIPE, check=True)
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requested_partition = None
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free_spaces = []
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lines = process.stdout.decode().splitlines()
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partition_table_type = lines[1].split(':')[5]
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for line in lines[2:]:
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line = line.rstrip(';')
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keys = ('number', 'start', 'end', 'size', 'type')
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parts = line.split(':')
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segment = dict(zip(keys, parts[:5]))
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segment['table_type'] = partition_table_type
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segment['start'] = _interpret_unit(segment['start'])
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segment['end'] = _interpret_unit(segment['end'])
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segment['size'] = _interpret_unit(segment['size'])
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if segment['type'] == 'free':
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segment['number'] = None
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free_spaces.append(segment)
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else:
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if segment['number'] == partition_number:
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requested_partition = segment
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return requested_partition, free_spaces
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def _interpret_unit(value):
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"""Return value in bytes after understanding parted unit."""
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value = value.rstrip('B') # For now, we only need to understand bytes
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return int(value)
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def main():
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"""Parse arguments and perform all duties."""
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arguments = parse_arguments()
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subcommand = arguments.subcommand.replace('-', '_')
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subcommand_method = globals()['subcommand_' + subcommand]
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subcommand_method(arguments)
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if __name__ == '__main__':
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main()
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