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btrbk: fix raw parent_uuid

delete-incremental-raw
Axel Burri 2022-11-20 12:21:12 +01:00
parent f9c7a47b6a
commit a713721b73
1 changed files with 25 additions and 31 deletions
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@ -3008,6 +3008,7 @@ sub vinfo_init_raw_root($;@)
SUBTREE => [],
UUID_HASH => {},
RECEIVED_UUID_HASH => {},
PARENT_UUID_HASH => {},
URL_PREFIX => $droot->{URL_PREFIX}, # for _fs_path (logging)
MOUNTINFO => [ { mount_point => $droot->{PATH} } ], # for _fs_path (logging)
};
@ -3019,13 +3020,24 @@ sub vinfo_init_raw_root($;@)
# inject nodes to fake btr_tree
$droot->{node} = $tree_root;
my %child_uuid_list;
foreach my $raw_info (@$raw_info_ary)
foreach my $raw_info (sort { $a->{NAME} cmp $b->{NAME} } @$raw_info_ary)
{
# Set btrfs subvolume information (received_uuid, parent_uuid) from filename info.
# Set btrfs subvolume information from filename info.
#
# NOTE: received_parent_uuid in BTRBK_RAW is the "parent of the source subvolume", NOT the
# "parent of the received subvolume".
# Important notes:
# - Raw targets have a fake uuid and parent_uuid.
# - RECEIVED_PARENT_UUID in BTRBK_RAW is the "parent of the
# source subvolume", NOT the "parent of the received subvolume".
#
# If restoring a backup from raw btrfs images (using "incremental yes|strict"):
# "btrfs send -p parent source > svol.btrfs", the backups
# on the target will get corrupted (unusable!) as soon as
# an any files in the chain gets deleted.
#
# We need to make sure btrbk will NEVER delete those (see _raw_depends):
# - svol.<timestamp>--<received_uuid_0>.btrfs : root (full) image
# - svol.<timestamp>--<received_uuid-n>[@<received_uuid_n-1>].btrfs : incremental image
my $subvol = vinfo_child($droot, $raw_info->{NAME});
unless(vinfo_inject_child($droot, $subvol, {
TARGET_TYPE => $raw_info->{TYPE},
@ -3038,38 +3050,20 @@ sub vinfo_init_raw_root($;@)
ERROR("Failed create raw node \"$raw_info->{NAME}\" from raw info file: \"$raw_info->{INFO_FILE}\"");
return undef;
}
if($raw_info->{RECEIVED_PARENT_UUID} ne '-') {
$child_uuid_list{$raw_info->{RECEIVED_PARENT_UUID}} //= [];
push @{$child_uuid_list{$raw_info->{RECEIVED_PARENT_UUID}}}, $subvol;
}
}
my @subvol_list = @{vinfo_subvol_list($droot, sort => 'path')};
DEBUG "Found " . scalar(@subvol_list) . " raw subvolume backups in: $droot->{PRINT}";
foreach my $subvol (@subvol_list)
{
# If restoring a backup from raw btrfs images (using "incremental yes|strict"):
# "btrfs send -p parent source > svol.btrfs", the backups
# on the target will get corrupted (unusable!) as soon as
# an any files in the chain gets deleted.
#
# We need to make sure btrbk will NEVER delete those:
# - svol.<timestamp>--<received_uuid_0>.btrfs : root (full) image
# - svol.<timestamp>--<received_uuid-n>[@<received_uuid_n-1>].btrfs : incremental image
foreach my $child (@{$child_uuid_list{$subvol->{node}{received_uuid}}}) {
# Insert correct (i.e. fake) parent UUID
$child->{node}{parent_uuid} = $subvol->{node}{uuid};
# Make sure that incremental backup chains are never broken:
DEBUG "Found parent/child partners, forcing preserve of: \"$subvol->{PRINT}\", \"$child->{PRINT}\"";
$subvol->{node}{FORCE_PRESERVE} = "preserve forced: parent of another raw target";
$child->{node}{FORCE_PRESERVE} ||= "preserve forced: child of another raw target";
}
# set parent_uuid based on RECEIVED_PARENT_UUID
foreach my $node (@{$tree_root->{SUBTREE}}) {
my $parents = $tree_root->{RECEIVED_UUID_HASH}{$node->{BTRBK_RAW}{RECEIVED_PARENT_UUID}} // [];
my $parent = (grep { $_->{BTRBK_RAW}{RECEIVED_PARENT_UUID} eq '-' } @$parents)[0] // $parents->[0]; # if multiple candidates, prefer non-incremental
TRACE "vinfo_init_raw_root: $node->{BTRBK_RAW}{NAME} parent=" . ($parent ? $parent->{BTRBK_RAW}{NAME} : "") if($do_trace);
next unless $parent;
$node->{parent_uuid} = $parent->{uuid};
push @{$tree_root->{PARENT_UUID_HASH}{$node->{parent_uuid}}}, $node;
}
# TRACE(Data::Dumper->Dump([\@subvol_list], ["vinfo_raw_subvol_list{$droot}"]));
}
$droot->{node} = $tree_root;