70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
# Copyright 2014-2015 Canonical Limited.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import re
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from stat import S_ISBLK
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from subprocess import (
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check_call,
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check_output,
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call
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)
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def is_block_device(path):
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'''
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Confirm device at path is a valid block device node.
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:returns: boolean: True if path is a block device, False if not.
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'''
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if not os.path.exists(path):
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return False
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return S_ISBLK(os.stat(path).st_mode)
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def zap_disk(block_device):
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'''
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Clear a block device of partition table. Relies on sgdisk, which is
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installed as pat of the 'gdisk' package in Ubuntu.
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:param block_device: str: Full path of block device to clean.
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'''
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# https://github.com/ceph/ceph/commit/fdd7f8d83afa25c4e09aaedd90ab93f3b64a677b
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# sometimes sgdisk exits non-zero; this is OK, dd will clean up
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call(['sgdisk', '--zap-all', '--', block_device])
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call(['sgdisk', '--clear', '--mbrtogpt', '--', block_device])
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dev_end = check_output(['blockdev', '--getsz',
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block_device]).decode('UTF-8')
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gpt_end = int(dev_end.split()[0]) - 100
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check_call(['dd', 'if=/dev/zero', 'of=%s' % (block_device),
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'bs=1M', 'count=1'])
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check_call(['dd', 'if=/dev/zero', 'of=%s' % (block_device),
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'bs=512', 'count=100', 'seek=%s' % (gpt_end)])
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def is_device_mounted(device):
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'''Given a device path, return True if that device is mounted, and False
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if it isn't.
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:param device: str: Full path of the device to check.
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:returns: boolean: True if the path represents a mounted device, False if
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it doesn't.
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'''
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try:
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out = check_output(['lsblk', '-P', device]).decode('UTF-8')
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except:
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return False
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return bool(re.search(r'MOUNTPOINT=".+"', out))
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