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storage plugins: en/decode volume notes as UTF-8

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When writing into the file, explicitly utf8 encode it, and then try
to utf8 decode it on read.

If the notes are not valid utf8, we assume they were iso-8859 encoded
and return as is.

Technically this is a breaking change, since there are iso-8859
comments that would successfully decode as utf8, for example: the
byte sequence "C2 A9" would be "£" in iso, but would decode to "£".

From what i can tell though, this is rather unlikely to happen for
"real world" notes, because the first byte would be in the range of
C0-F7 (which are mostly language dependent characters like "Â") and
the following bytes would have to be in the range of 80-BF, which are
only special characters like "£" (or undefined)

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
This commit is contained in:
Dominik Csapak
2022-03-09 09:21:28 +01:00
committed by Thomas Lamprecht
parent 7a8751a2cd
commit 43f8112f0b
2 changed files with 9 additions and 3 deletions
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9
PVE/Storage/DirPlugin.pm
View File

@ -4,6 +4,7 @@ use strict;
use warnings;
use Cwd;
use Encode qw(decode encode);
use File::Path;
use IO::File;
use POSIX;
@ -104,7 +105,10 @@ sub get_volume_notes {
my $path = $class->filesystem_path($scfg, $volname);
$path .= $class->SUPER::NOTES_EXT;
return PVE::Tools::file_get_contents($path) if -f $path;
if (-f $path) {
my $data = PVE::Tools::file_get_contents($path);
return eval { decode('UTF-8', $data, 1) } // $data;
}
return '';
}
@ -121,7 +125,8 @@ sub update_volume_notes {
$path .= $class->SUPER::NOTES_EXT;
if (defined($notes) && $notes ne '') {
PVE::Tools::file_set_contents($path, $notes);
my $encoded = encode('UTF-8', $notes);
PVE::Tools::file_set_contents($path, $encoded);
} else {
unlink $path or $! == ENOENT or die "could not delete notes - $!\n";
}

3
PVE/Storage/Plugin.pm
View File

@ -3,6 +3,7 @@ package PVE::Storage::Plugin;
use strict;
use warnings;
use Encode qw(decode);
use Fcntl ':mode';
use File::chdir;
use File::Path;
@ -1197,7 +1198,7 @@ my $get_subdir_files = sub {
my $notes_fn = $original.NOTES_EXT;
if (-f $notes_fn) {
my $notes = PVE::Tools::file_read_firstline($notes_fn);
$info->{notes} = $notes if defined($notes);
$info->{notes} = eval { decode('UTF-8', $notes, 1) } // $notes if defined($notes);
}
$info->{protected} = 1 if -e PVE::Storage::protection_file_path($original);