source: package_branches/invirt-remote/hvirt/host/usr/sbin/invirt-lvm @ 2874

Last change on this file since 2874 was 2436, checked in by broder, 15 years ago

In invirt-remote:

  • Instead of running all of the disk-wiping dds simultaneously, run them sequentially using a janitor daemon (LP: #411486).
  • Property svn:executable set to *
File size: 3.2 KB
Line 
1#!/usr/bin/env python
2
3import sys
4import time
5import os
6import random
7import string
8from subprocess import call, PIPE, Popen
9from invirt.config import structs as config
10
11def check(b):
12    if not b:
13        exit(1)
14
15vg = "xenvg"
16prefix = "d_"
17
18subcommand = sys.argv[1]
19
20def ensureoff(machine):
21    # Make sure the machine is off, but we don't care about errors if it is already off.
22    rv = call(["/usr/sbin/xm", "destroy", prefix + machine],
23              stderr=PIPE)
24
25if subcommand == "lvcreate-all":
26    from invirt import database
27    import re
28    database.connect()
29    for d in Disk.select():
30        check(re.match('^[A-Za-z0-9]+$', d.guest_device_name))
31        machine = Machine.get(d.machine_id)
32        check(re.match('^[A-Za-z0-9][A-Za-z0-9._-]*$', machine.name))
33        lvname = prefix + machine.name + "_" + d.guest_device_name
34        if not os.path.exists("/dev/%s/%s" % (vg, lvname)):
35            # LV doesn't exist
36            print >>sys.stderr, "Creating LV %s..." % (lvname,)
37            rv = call(["/sbin/lvcreate", "-L", str(d.size) + "M", "-n", lvname, vg])
38            if rv != 0:
39                print >>sys.stderr, "Error creating LV %s\n" %(lvname,)
40                sys.exit(1)
41else:
42    machine = sys.argv[2]
43    disk = sys.argv[3]
44    lvname = prefix + machine + "_" + disk
45    lvpath = "/dev/" + vg + "/" + lvname
46if subcommand == "lvremove":
47    def error():
48        print >>sys.stderr, "Error removing LV %s\n" % lvname
49        sys.exit(1)
50   
51    # Rename the LV to something else so we can wipe it before reusing
52    # the space
53    while True:
54        new_lvname = "old_%s_%s" % (lvname, ''.join(random.choice(string.ascii_letters) for i in xrange(6)))
55        new_lvpath = "/dev/%s/%s" % (vg, new_lvname)
56        p = Popen(["/sbin/lvrename", lvpath, new_lvpath], stdout=PIPE, stderr=PIPE)
57        rv = p.wait()
58        if rv == 5 and 'already exists in volume group' in p.stderr.read():
59            continue
60        elif rv != 0:
61            error()
62        else:
63            break
64    ensureoff(machine)
65   
66    # Touch a file corresponding to the new name of the LV; a separate
67    # daemon will handle wiping and deleting it.
68    open(os.path.join('/var/lib/invirt-remote/cleanup', new_lvname), 'w')
69elif subcommand == "lvresize":
70    size = sys.argv[4]
71    ensureoff(machine)
72    p = Popen(["/sbin/lvresize", "-L", size + "M", lvpath],
73              stdin=PIPE, stderr=PIPE)
74    print >> p.stdin, 'y'
75    err = p.stderr.read()
76    if p.wait() != 0 and 'matches existing size' not in err:
77        print >> sys.stderr, "Error resizing LV %s:\n" %(lvname,)
78        print >> sys.stderr, err
79        sys.exit(1)
80    print >> sys.stderr, err
81elif subcommand == "lvrename":
82    newmachine = sys.argv[4]
83    newlvname = prefix + newmachine + "_" + disk
84    ensureoff(machine)
85    ensureoff(newmachine)   
86    rv = call(["/sbin/lvrename", vg, lvname, newlvname])
87    if rv != 0:
88        print >>sys.stderr, "Error renaming LV %s\n" %(lvname,)
89        sys.exit(1)
90elif subcommand == "lvcreate":
91    size = sys.argv[4]
92    rv = call(["/sbin/lvcreate", "-L", size + "M", "-n", lvname, vg])
93    if rv != 0:
94        print >>sys.stderr, "Error creating LV %s\n" %(lvname,)
95        sys.exit(1)
96
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