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23
by Adam Gandelman
Merging python-redux and havana work. |
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from subprocess import ( |
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CalledProcessError, |
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check_call, |
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check_output, |
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Popen, |
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PIPE, |
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)
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##################################################
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# LVM helpers.
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##################################################
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def deactivate_lvm_volume_group(block_device): |
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'''
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Deactivate any volume gruop associated with an LVM physical volume.
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:param block_device: str: Full path to LVM physical volume
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'''
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vg = list_lvm_volume_group(block_device) |
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if vg: |
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cmd = ['vgchange', '-an', vg] |
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check_call(cmd) |
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def is_lvm_physical_volume(block_device): |
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'''
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Determine whether a block device is initialized as an LVM PV.
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:param block_device: str: Full path of block device to inspect.
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:returns: boolean: True if block device is a PV, False if not.
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'''
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try: |
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check_output(['pvdisplay', block_device]) |
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return True |
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except CalledProcessError: |
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return False |
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def remove_lvm_physical_volume(block_device): |
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'''
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Remove LVM PV signatures from a given block device.
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:param block_device: str: Full path of block device to scrub.
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'''
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p = Popen(['pvremove', '-ff', block_device], |
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stdin=PIPE) |
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p.communicate(input='y\n') |
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def list_lvm_volume_group(block_device): |
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'''
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List LVM volume group associated with a given block device.
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Assumes block device is a valid LVM PV.
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:param block_device: str: Full path of block device to inspect.
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:returns: str: Name of volume group associated with block device or None
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'''
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vg = None |
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pvd = check_output(['pvdisplay', block_device]).splitlines() |
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for l in pvd: |
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if l.strip().startswith('VG Name'): |
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35.1.1
by Christopher Glass
Updating charm-helpers from lp:charm-helpers revision 153 |
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vg = ' '.join(l.strip().split()[2:]) |
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23
by Adam Gandelman
Merging python-redux and havana work. |
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return vg |
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def create_lvm_physical_volume(block_device): |
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'''
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Initialize a block device as an LVM physical volume.
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:param block_device: str: Full path of block device to initialize.
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'''
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check_call(['pvcreate', block_device]) |
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def create_lvm_volume_group(volume_group, block_device): |
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'''
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Create an LVM volume group backed by a given block device.
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Assumes block device has already been initialized as an LVM PV.
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:param volume_group: str: Name of volume group to create.
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:block_device: str: Full path of PV-initialized block device.
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'''
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check_call(['vgcreate', volume_group, block_device]) |