[PVE-User] vzdump issue - couldn't detect volume group because of case sensitivity issue

StalkR stalkr at stalkr.net
Wed Feb 23 09:46:24 CET 2011


Trying vzdump in LVM snapshot mode on an Ubuntu server 10.04 amd64
system, it was failing with "mode failure - unable to detect lvm
volume group".
We eventually found the culprit, on this system we have:
# lvs --units m --separator ':' --noheadings -o vg_name,lv_name,lv_size
instead of the expected:

Anyway, VZDump.pm has a regexp to match uppercase M. Adding the "i"
flag for case insentivity solved the issue.
Patch suggestion:

--- /usr/share/perl5/PVE/VZDump.pm.orig 2011-02-22 22:32:23.000000000 +0100
+++ /usr/share/perl5/PVE/VZDump.pm      2011-02-22 22:32:38.000000000 +0100
@@ -619,7 +619,7 @@
    my $cmd = "lvs --units m --separator ':' --noheadings -o
    if (my $fd = IO::File->new ("$cmd 2>/dev/null|")) {
       while (my $line = <$fd>) {
-           if ($line =~ m|^\s*(\S+):(\S+):(\d+(\.\d+))M$|) {
+           if ($line =~ m|^\s*(\S+):(\S+):(\d+(\.\d+))M$|i) {
               my $vg = $1;
               my $lv = $2;
               $devmapper->{"/dev/$vg/$lv"} = [$vg, $lv];

What do you think?

We first thought it was a locale problem, but vzdump is explicitely using:
$ENV{LANG} = "C"; # avoid locale related issues/warnings
So I'm not sure what causes this, maybe it will still bug for some
strange locales.


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