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121 lines
3.2 KiB
Python
121 lines
3.2 KiB
Python
#
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# Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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#
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# This file is part of LVM2.
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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 Lesser General Public License as published by
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# the Free Software Foundation, either version 2.1 of the License, or
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# (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 Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser 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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# Python example code:
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#-----------------------------
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import lvm
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# Note: This example will create a logical unit, tag it and
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# delete it, don't run this on production box!
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#Dump information about PV
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def print_pv(pv):
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print('PV name: ', pv.getName(), ' ID: ', pv.getUuid(), 'Size: ', pv.getSize())
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#Dump some information about a specific volume group
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def print_vg(vg_name):
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#Open read only
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vg = lvm.vgOpen(vg_name, 'r')
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print('Volume group:', vg_name, 'Size: ', vg.getSize())
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#Retrieve a list of Physical volumes for this volume group
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pv_list = vg.listPVs()
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#Print out the physical volumes
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for p in pv_list:
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print_pv(p)
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#Get a list of logical volumes in this volume group
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lv_list = vg.listLVs()
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if len(lv_list):
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for l in lv_list:
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print('LV name: ', l.getName(), ' ID: ', l.getUuid())
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else:
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print('No logical volumes present!')
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vg.close()
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#Returns the name of a vg with space available
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def find_vg_with_free_space():
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free_space = 0
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rc = None
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vg_names = lvm.listVgNames()
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for v in vg_names:
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vg = lvm.vgOpen(v, 'r')
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c_free = vg.getFreeSize()
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if c_free > free_space:
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free_space = c_free
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rc = v
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vg.close()
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return rc
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#Walk through the volume groups and fine one with space in which we can
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#create a new logical volume
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def create_delete_logical_volume():
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vg_name = find_vg_with_free_space()
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print('Using volume group ', vg_name, ' for example')
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if vg_name:
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vg = lvm.vgOpen(vg_name, 'w')
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lv = vg.createLvLinear('python_lvm_ok_to_delete', vg.getFreeSize())
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if lv:
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print('New lv, id= ', lv.getUuid())
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#Create a tag
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lv.addTag('Demo_tag')
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#Get the tags
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tags = lv.getTags()
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for t in tags:
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#Remove tag
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lv.removeTag(t)
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lv.deactivate()
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#Try to rename
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lv.rename("python_lvm_renamed")
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print('LV name= ', lv.getName())
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lv.remove()
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vg.close()
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else:
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print('No free space available to create demo lv!')
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if __name__ == '__main__':
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#What version
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print('lvm version=', lvm.getVersion())
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#Get a list of volume group names
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vg_names = lvm.listVgNames()
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#For each volume group display some information about each of them
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for vg_i in vg_names:
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print_vg(vg_i)
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#Demo creating a logical volume
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create_delete_logical_volume()
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