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python-lvm: Update example to work with lvm object removal.

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Signed-off-by: Tony Asleson <tasleson@redhat.com>
Signed-off-by: Andy Grover <agrover@redhat.com>
This commit is contained in:
Tony Asleson 2012-10-15 13:54:19 -07:00 committed by Andy Grover
parent 12b631a676
commit 10ba799ab0
1 changed files with 16 additions and 21 deletions
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37
python/example.py
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@ -31,9 +31,9 @@ def print_pv(pv):
#Dump some information about a specific volume group #Dump some information about a specific volume group
def print_vg(h, vg_name): def print_vg(vg_name):
#Open read only #Open read only
vg = h.vgOpen(vg_name, 'r') vg = lvm.vgOpen(vg_name, 'r')
print 'Volume group:', vg_name, 'Size: ', vg.getSize() print 'Volume group:', vg_name, 'Size: ', vg.getSize()
@ -55,13 +55,13 @@ def print_vg(h, vg_name):
vg.close() vg.close()
#Returns the name of a vg with space available #Returns the name of a vg with space available
def find_vg_with_free_space(h): def find_vg_with_free_space():
free_space = 0 free_space = 0
rc = None rc = None
vg_names = l.listVgNames() vg_names = lvm.listVgNames()
for v in vg_names: for v in vg_names:
vg = h.vgOpen(v, 'r') vg = lvm.vgOpen(v, 'r')
c_free = vg.getFreeSize() c_free = vg.getFreeSize()
if c_free > free_space: if c_free > free_space:
free_space = c_free free_space = c_free
@ -72,13 +72,13 @@ def find_vg_with_free_space(h):
#Walk through the volume groups and fine one with space in which we can #Walk through the volume groups and fine one with space in which we can
#create a new logical volume #create a new logical volume
def create_delete_logical_volume(h): def create_delete_logical_volume():
vg_name = find_vg_with_free_space(h) vg_name = find_vg_with_free_space()
print 'Using volume group ', vg_name, ' for example' print 'Using volume group ', vg_name, ' for example'
if vg_name: if vg_name:
vg = h.vgOpen(vg_name, 'w') vg = lvm.vgOpen(vg_name, 'w')
lv = vg.createLvLinear('python_lvm_ok_to_delete', vg.getFreeSize()) lv = vg.createLvLinear('python_lvm_ok_to_delete', vg.getFreeSize())
if lv: if lv:
@ -93,11 +93,11 @@ def create_delete_logical_volume(h):
#Remove tag #Remove tag
lv.removeTag(t) lv.removeTag(t)
#Try to rename
lv.rename("python_lvm_ok_to_be_removed_shortly")
print 'LV name= ', lv.getName()
lv.deactivate() lv.deactivate()
#Try to rename
lv.rename("python_lvm_renamed")
print 'LV name= ', lv.getName()
lv.remove() lv.remove()
vg.close() vg.close()
@ -105,21 +105,16 @@ def create_delete_logical_volume(h):
print 'No free space available to create demo lv!' print 'No free space available to create demo lv!'
if __name__ == '__main__': if __name__ == '__main__':
#Create a new LVM instance
l = lvm.Liblvm()
#What version #What version
print 'lvm version=', l.getVersion() print 'lvm version=', lvm.getVersion()
#Get a list of volume group names #Get a list of volume group names
vg_names = l.listVgNames() vg_names = lvm.listVgNames()
#For each volume group display some information about each of them #For each volume group display some information about each of them
for vg_i in vg_names: for vg_i in vg_names:
print_vg(l, vg_i) print_vg(vg_i)
#Demo creating a logical volume #Demo creating a logical volume
create_delete_logical_volume(l) create_delete_logical_volume()
#Close
l.close()