### Home Classes Methods

### In Files

- lib/chef/chef_fs/file_system.rb
- lib/chef/chef_fs/file_system/chef_repository_file_system_entry.rb
- lib/chef/chef_fs/file_system/file_system_entry.rb
- lib/chef/chef_fs/file_system/base_fs_dir.rb
- lib/chef/chef_fs/file_system/chef_repository_file_system_root_dir.rb
- lib/chef/chef_fs/file_system/nodes_dir.rb
- lib/chef/chef_fs/file_system/must_delete_recursively_error.rb
- lib/chef/chef_fs/file_system/cookbook_dir.rb
- lib/chef/chef_fs/file_system/cookbook_subdir.rb
- lib/chef/chef_fs/file_system/data_bags_dir.rb
- lib/chef/chef_fs/file_system/base_fs_object.rb
- lib/chef/chef_fs/file_system/data_bag_item.rb
- lib/chef/chef_fs/file_system/nonexistent_fs_object.rb
- lib/chef/chef_fs/file_system/file_system_root_dir.rb
- lib/chef/chef_fs/file_system/cookbook_file.rb
- lib/chef/chef_fs/file_system/not_found_error.rb
- lib/chef/chef_fs/file_system/file_system_error.rb
- lib/chef/chef_fs/file_system/rest_list_dir.rb
- lib/chef/chef_fs/file_system/cookbooks_dir.rb
- lib/chef/chef_fs/file_system/rest_list_entry.rb
- lib/chef/chef_fs/file_system/data_bag_dir.rb
- lib/chef/chef_fs/file_system/chef_server_root_dir.rb

### Namespace

- CLASS Chef::ChefFS::FileSystem::BaseFSDir
- CLASS Chef::ChefFS::FileSystem::BaseFSObject
- CLASS Chef::ChefFS::FileSystem::ChefRepositoryFileSystemEntry
- CLASS Chef::ChefFS::FileSystem::ChefRepositoryFileSystemRootDir
- CLASS Chef::ChefFS::FileSystem::ChefServerRootDir
- CLASS Chef::ChefFS::FileSystem::CookbookDir
- CLASS Chef::ChefFS::FileSystem::CookbookFile
- CLASS Chef::ChefFS::FileSystem::CookbookSubdir
- CLASS Chef::ChefFS::FileSystem::CookbooksDir
- CLASS Chef::ChefFS::FileSystem::DataBagDir
- CLASS Chef::ChefFS::FileSystem::DataBagItem
- CLASS Chef::ChefFS::FileSystem::DataBagsDir
- CLASS Chef::ChefFS::FileSystem::FileSystemEntry
- CLASS Chef::ChefFS::FileSystem::FileSystemError
- CLASS Chef::ChefFS::FileSystem::FileSystemRootDir
- CLASS Chef::ChefFS::FileSystem::MustDeleteRecursivelyError
- CLASS Chef::ChefFS::FileSystem::NodesDir
- CLASS Chef::ChefFS::FileSystem::NonexistentFSObject
- CLASS Chef::ChefFS::FileSystem::NotFoundError
- CLASS Chef::ChefFS::FileSystem::RestListDir
- CLASS Chef::ChefFS::FileSystem::RestListEntry

### Methods

- ::child_pairs
- ::compare
- ::copy_to
- ::list
- ::list_pairs
- ::resolve_path

### Files

- LICENSE

### Class/Module Index

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# Chef::ChefFS::FileSystem

### Public Class Methods

child_pairs(a, b) click to toggle source

Get entries for children of either a or b, with matching pairs matched up.

#### Returns

An array of child pairs.

    [ [ a_child, b_child ], ... ]

If a child is only in a or only in b, the other child entry will be retrieved by name (and will most likely be a "nonexistent child").

#### Example

    Chef::ChefFS::FileSystem.child_pairs(a, b).length

    # File lib/chef/chef_fs/file_system.rb, line 177
    def self.child_pairs(a, b)
      # If both are directories, recurse into them and diff the children instead of returning ourselves.
      result = []
      a_children_names = Set.new
      a.children.each do |a_child|
        a_children_names << a_child.name
        result << [ a_child, b.child(a_child.name) ]
      end

      # Check b for children that aren't in a
      b.children.each do |b_child|
        if !a_children_names.include?(b_child.name)
          result << [ a.child(b_child.name), b_child ]
        end
      end
      result
    end

compare(a, b) click to toggle source

    # File lib/chef/chef_fs/file_system.rb, line 195
    def self.compare(a, b)
      are_same, a_value, b_value = a.compare_to(b)
      if are_same.nil?
        are_same, b_value, a_value = b.compare_to(a)
      end
      if are_same.nil?
        begin
          a_value = a.read if a_value.nil?
        rescue Chef::ChefFS::FileSystem::NotFoundError
          a_value = :none
        end
        begin
          b_value = b.read if b_value.nil?
        rescue Chef::ChefFS::FileSystem::NotFoundError
          b_value = :none
        end
        are_same = (a_value == b_value)
      end
      [ are_same, a_value, b_value ]
    end

copy_to(pattern, src_root, dest_root, recurse_depth, options) click to toggle source

Copy everything matching the given pattern from src to dest.

After this method completes, everything in dest matching the given pattern will look identical to src.

#### Attributes

- `pattern` - Chef::ChefFS::FilePattern to match children under

- `src_root` - the root from which things will be copied

- `dest_root` - the root to which things will be copied

- `recurse_depth` - the maximum depth to copy things. `nil` means infinite depth. 0 means no recursion.

- `options` - hash of options:

  - `purge` - if `true`, items in `dest` that are not in `src`

  will be deleted from `dest`. If `false`, these items will be left alone.

  - `force` - if `true`, matching files are always copied from `src` to `dest`. If `false`, they will only be copied if actually different (which will take time to determine).

  - `dry_run` - if `true`, action will not actually be taken; things will be printed out instead.

#### Examples

    Chef::ChefFS::FileSystem.copy_to(FilePattern.new('/cookbooks'),
      chef_fs, local_fs, nil, true) do |message|
      puts message
    end

    # File lib/chef/chef_fs/file_system.rb, line 116
    def self.copy_to(pattern, src_root, dest_root, recurse_depth, options)
      found_result = false
      list_pairs(pattern, src_root, dest_root) do |src, dest|
        found_result = true
        new_dest_parent = get_or_create_parent(dest, options)
        copy_entries(src, dest, new_dest_parent, recurse_depth, options)
      end
      if !found_result && pattern.exact_path
        puts "#{pattern}: No such file or directory on remote or local"
      end
    end

list(entry, pattern, &block) click to toggle source

Yields a list of all things under (and including) this entry that match the given pattern.

#### Attributes

- `entry` - Entry to start listing under

- `pattern` - Chef::ChefFS::FilePattern to match children under

    # File lib/chef/chef_fs/file_system.rb, line 32
    def self.list(entry, pattern, &block)
      # Include self in results if it matches
      if pattern.match?(entry.path)
        block.call(entry)
      end

      if entry.dir? && pattern.could_match_children?(entry.path)
        # If it's possible that our children could match, descend in and add matches.
        exact_child_name = pattern.exact_child_name_under(entry.path)

        # If we've got an exact name, don't bother listing children; just grab the
        # child with the given name.
        if exact_child_name
          exact_child = entry.child(exact_child_name)
          if exact_child
            list(exact_child, pattern, &block)
          end

        # Otherwise, go through all children and find any matches
        else
          entry.children.each do |child|
            list(child, pattern, &block)
          end
        end
      end
    end

list_pairs(pattern, a_root, b_root) click to toggle source

Yield entries for children that are in either `a_root` or `b_root`, with matching pairs matched up.

#### Yields

Yields matching entries in pairs:

    [ a_entry, b_entry ]

#### Example

    Chef::ChefFS::FileSystem.list_pairs(FilePattern.new('**x.txt', a_root, b_root)) do |a, b|
      ...
    end

    # File lib/chef/chef_fs/file_system.rb, line 143
    def self.list_pairs(pattern, a_root, b_root)
      # Make sure everything on the server is also on the filesystem, and diff
      found_paths = Set.new
      Chef::ChefFS::FileSystem.list(a_root, pattern) do |a|
        found_paths << a.path
        b = Chef::ChefFS::FileSystem.resolve_path(b_root, a.path)
        yield [ a, b ]
      end

      # Check the outer regex pattern to see if it matches anything on the
      # filesystem that isn't on the server
      Chef::ChefFS::FileSystem.list(b_root, pattern) do |b|
        if !found_paths.include?(b.path)
          a = Chef::ChefFS::FileSystem.resolve_path(a_root, b.path)
          yield [ a, b ]
        end
      end
    end

resolve_path(entry, path) click to toggle source

Resolve the given path against the entry, returning the entry at the end of the path.

#### Attributes

- `entry` - the entry to start looking under. Relative paths will be resolved from here.

- `path` - the path to resolve. If it starts with `/`, the path will be resolved starting from `entry.root`.

#### Examples

    Chef::ChefFS::FileSystem.resolve_path(root_path, 'cookbooks/java/recipes/default.rb')

    # File lib/chef/chef_fs/file_system.rb, line 73
    def self.resolve_path(entry, path)
      return entry if path.length == 0
      return resolve_path(entry.root, path) if path[0,1] == "/" && entry.root != entry
      if path[0,1] == "/"
        path = path[1,path.length-1]
      end

      result = entry
      Chef::ChefFS::PathUtils::split(path).each do |part|
        result = result.child(part)
      end
      result
    end

[Validate]

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