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btrbk
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btrbk: fixed btr_tree, use it for "diff" command

pull/30/head
Axel Burri 2014-12-14 22:03:31 +01:00
parent a5fec23a15
commit f6c134ea1b
1 changed files with 28 additions and 29 deletions
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btrbk
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@ -289,50 +289,35 @@ sub btr_subvolume_find_new($$)
sub btr_tree($)
{
my $vol = shift;
my $detail = btr_subvolume_detail($vol);
unless($detail && $detail->{is_root}) {
ERROR "\"$vol\" is not btrfs root!";
return undef;
}
my %tree;
my %id;
foreach my $node (btr_subvolume_list($vol, subvol_only => 0))
{
TRACE "btr_tree: processing subvolid=$node->{id}";
# set FS_PATH
#
# NOTE: these substitutions are only valid if $root is a
# absolute path to a btrfs root volume (mounted with
# subvolumeid=0)
TRACE "btr_tree: original path: $node->{path}";
$node->{FS_PATH} = $node->{path};
if($node->{FS_PATH} =~ s/^<FS_TREE>\///) {
TRACE "btr_tree: removed <FS_TREE> portion subvolume path: $node->{FS_PATH}";
}
$node->{SUBVOL_PATH} = $node->{FS_PATH};
TRACE "btr_tree: set SUBVOL_PATH: $node->{FS_PATH}";
$node->{FS_PATH} = $vol . "/" . $node->{FS_PATH};
TRACE "btr_tree: set FS_PATH: $node->{FS_PATH}";
$id{$node->{id}} = $node;
$tree{$node->{SUBVOL_PATH}} = $node;
$uuid_info{$node->{uuid}} = $node;
if($node->{top_level} != 5)
if($node->{top_level} == 5)
{
# man btrfs-subvolume:
# Also every btrfs filesystem has a default subvolume as its initially
# top-level subvolume, whose subvolume id is 5(FS_TREE).
# set child/parent node
die unless exists($id{$node->{top_level}});
die if exists($id{$node->{top_level}}->{SUBVOLUME}->{$node->{SUBVOL_PATH}});
$id{$node->{top_level}}->{SUBVOLUME}->{$node->{SUBVOL_PATH}} = $node;
$node->{TOP_LEVEL_NODE} = $id{$node->{top_level}};
$tree{$node->{id}} = $node;
}
else
{
# set SUBVOLUME / TOP_LEVEL node
die unless exists($id{$node->{top_level}});
die if exists($id{$node->{top_level}}->{SUBVOLUME}->{$node->{id}});
$id{$node->{top_level}}->{SUBVOLUME}->{$node->{id}} = $node;
$node->{TOP_LEVEL} = $id{$node->{top_level}};
}
}
# set PARENT node
foreach (values %id){
$_->{PARENT} = $uuid_info{$_->{parent_uuid}} if($_->{parent_uuid} ne "-");
}
return \%tree;
}
@ -563,6 +548,20 @@ MAIN:
if($detail->{is_root}) { ERROR "subvolume at \"$vol\" is btrfs root!"; exit 1; }
unless($detail->{cgen}) { ERROR "subvolume at \"$vol\" does not provide cgen"; exit 1; }
if($detail->{parent_uuid} eq "-") { ERROR "subvolume at \"$vol\" has no parent, aborting."; exit 1; }
my $info = btr_tree($vol);
my $node = $uuid_info{$detail->{uuid}};
my $parent = $uuid_info{$detail->{parent_uuid}};
print "--------------------------------------------------------------------------------\n";
print "Showing diff for: $node->{path}\n";
print "Parent is at : $parent->{path}\n";
print "--------------------------------------------------------------------------------\n";
die unless($node->{cgen} == $detail->{cgen}); # my paranoia
unless($node->{cgen} == $parent->{gen}) { # this should always match as far as i understand btrfs send -p
WARN "generation mismatch: cgen=$node->{cgen} != parent_gen=$parent->{gen}";
}
# dump files, sorted and unique
my $ret = btr_subvolume_find_new($vol, $detail->{cgen});
my %files;
foreach (split(/\n/, $ret)) {