Class: Snapsync::Cleanup

Inherits:
Object
  • Object
show all
Defined in:
lib/snapsync/cleanup.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(policy) ⇒ Cleanup

Returns a new instance of Cleanup.



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# File 'lib/snapsync/cleanup.rb', line 7

def initialize(policy)
    @policy = policy
end

Instance Attribute Details

#policy ⇒ Object (readonly)

The underlying timeline policy object that we use to compute which snapshots to delete and which to keep



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# File 'lib/snapsync/cleanup.rb', line 5

def policy
  @policy
end

Instance Method Details

#cleanup(target, dry_run: false) ⇒ Object 



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# File 'lib/snapsync/cleanup.rb', line 11

def cleanup(target, dry_run: false)
    snapshots = target.each_snapshot.to_a
    filtered_snapshots = policy.filter_snapshots(snapshots).to_set

    if filtered_snapshots.any? { |s| s.synchronization_point? }
        raise InvalidPolicy, "#{policy} returned a snapsync synchronization point in its results"
    end

    if filtered_snapshots.empty?
        raise InvalidPolicy, "#{policy} returned no snapshots"
    end

    last_sync_point = snapshots.
        sort_by(&:num).reverse.
        find { |s| s.synchronization_point_for?(target) }
    filtered_snapshots << last_sync_point
    filtered_snapshots = filtered_snapshots.to_set

    deleted_snapshots = snapshots.sort_by(&:num).find_all do |s|
        if !filtered_snapshots.include?(s)
            target.delete(s, dry_run: dry_run)
            true
        end
    end

    if !deleted_snapshots.empty?
        Snapsync.info "Waiting for subvolumes to be deleted"
        deleted_snapshots.each do |s|
            begin
                Btrfs.popen("subvolume", "sync", s.subvolume_dir.to_s)
            rescue Btrfs::Error
            end
        end
    end
end