source: trunk/packages/invirt-remote-host/files/usr/sbin/invirt-lvm @ 1775

Last change on this file since 1775 was 1716, checked in by broder, 16 years ago

I know this is the wrong answer, but doing lvchange -a n twice before
deleting an LV tends to make it less likely to error out

  • Property svn:executable set to *
File size: 2.8 KB
Line 
1#!/usr/bin/env python
2
3import sys
4import os.path
5from subprocess import call, PIPE, Popen
6from invirt.config import structs as config
7
8def check(b):
9    if not b:
10        exit(1)
11
12vg = "xenvg"
13prefix = "d_"
14
15subcommand = sys.argv[1]
16
17def ensureoff(machine):
18    # Make sure the machine is off, but we don't care about errors if it is already off.
19    rv = call(["/usr/sbin/xm", "destroy", prefix + machine],
20              stderr=PIPE)
21
22if subcommand == "lvcreate-all":
23    from invirt import database
24    import re
25    database.connect()
26    for d in Disk.select():
27        check(re.match('^[A-Za-z0-9]+$', d.guest_device_name))
28        machine = Machine.get(d.machine_id)
29        check(re.match('^[A-Za-z0-9][A-Za-z0-9._-]*$', machine.name))
30        lvname = prefix + machine.name + "_" + d.guest_device_name
31        if not os.path.exists("/dev/%s/%s" % (vg, lvname)):
32            # LV doesn't exist
33            print >>sys.stderr, "Creating LV %s..." % (lvname,)
34            rv = call(["/sbin/lvcreate", "-L", str(d.size) + "M", "-n", lvname, vg])
35            if rv != 0:
36                print >>sys.stderr, "Error creating LV %s\n" %(lvname,)
37                sys.exit(1)
38else:
39    machine = sys.argv[2]
40    disk = sys.argv[3]
41    lvname = prefix + machine + "_" + disk
42    lvpath = "/dev/" + vg + "/" + lvname
43if subcommand == "lvremove":
44    def error():
45        print >>sys.stderr, "Error removing LV %s\n" % lvname
46        sys.exit(1)
47    # I know this is the wrong answer, but sometimes the first
48    # lvchange -a n fails for no particularly good reason, so this is
49    # a pretty good workaround
50    call(["/sbin/lvchange", "-a", "n", lvpath])
51    rv = call(["/sbin/lvchange", "-a", "n", lvpath])
52    if rv != 0:
53        error()
54    rv = call(["/sbin/lvchange", "-a", "ey", lvpath])
55    if rv != 0:
56        error()
57    rv = call(["/sbin/lvremove", "--force", lvpath])
58    if rv != 0:
59        error()
60    ensureoff(machine)
61elif subcommand == "lvresize":
62    size = sys.argv[4]
63    ensureoff(machine)
64    p = Popen(["/sbin/lvresize", "-L", size + "M", lvpath],
65              stdin=PIPE, stderr=PIPE)
66    print >> p.stdin, 'y'
67    err = p.stderr.read()
68    if p.wait() != 0 and 'matches existing size' not in err:
69        print >> sys.stderr, "Error resizing LV %s:\n" %(lvname,)
70        print >> sys.stderr, err
71        sys.exit(1)
72    print >> sys.stderr, err
73elif subcommand == "lvrename":
74    newmachine = sys.argv[4]
75    newlvname = prefix + newmachine + "_" + disk
76    ensureoff(machine)
77    ensureoff(newmachine)   
78    rv = call(["/sbin/lvrename", vg, lvname, newlvname])
79    if rv != 0:
80        print >>sys.stderr, "Error renaming LV %s\n" %(lvname,)
81        sys.exit(1)
82elif subcommand == "lvcreate":
83    size = sys.argv[4]
84    rv = call(["/sbin/lvcreate", "-L", size + "M", "-n", lvname, vg])
85    if rv != 0:
86        print >>sys.stderr, "Error creating LV %s\n" %(lvname,)
87        sys.exit(1)
88   
89
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