module FileUtils

Changes the working directory to the given dir, which should be interpretable as a path:

With no block given, changes the current directory to the directory at dir; returns zero:

FileUtils.pwd # => "/rdoc/fileutils"
FileUtils.cd('..')
FileUtils.pwd # => "/rdoc"
FileUtils.cd('fileutils')

With a block given, changes the current directory to the directory at dir, calls the block with argument dir, and restores the original current directory; returns the block’s value:

FileUtils.pwd                                     # => "/rdoc/fileutils"
FileUtils.cd('..') { |arg| [arg, FileUtils.pwd] } # => ["..", "/rdoc"]
FileUtils.pwd                                     # => "/rdoc/fileutils"

Keyword arguments:

• verbose: true - prints an equivalent command:

  FileUtils.cd('..')
  FileUtils.cd('fileutils')
  

  Output:

  cd ..
  cd fileutils

Related: FileUtils.pwd.

# File lib/fileutils.rb, line 239
def cd(dir, verbose: nil, &block) # :yield: dir
  fu_output_message "cd #{dir}" if verbose
  result = Dir.chdir(dir, &block)
  fu_output_message 'cd -' if verbose and block
  result
end

Changes permissions on the entries at the paths given in list (a single path or an array of paths) to the permissions given by mode; returns list if it is an array, [list] otherwise:

• Modifies each entry that is a regular file using File.chmod.

• Modifies each entry that is a symbolic link using File.lchmod.

Argument list or its elements should be interpretable as paths.

Argument mode may be either an integer or a string:

• Integer mode: represents the permission bits to be set:

  FileUtils.chmod(0755, 'src0.txt')
  FileUtils.chmod(0644, ['src0.txt', 'src0.dat'])
  

• String mode: represents the permissions to be set:

  The string is of the form [targets][[operator][perms[,perms]], where:

  • targets may be any combination of these letters:

    • 'u': permissions apply to the file’s owner.

    • 'g': permissions apply to users in the file’s group.

    • 'o': permissions apply to other users not in the file’s group.

    • 'a' (the default): permissions apply to all users.

  • operator may be one of these letters:

    • '+': adds permissions.

    • '-': removes permissions.

    • '=': sets (replaces) permissions.

  • perms (may be repeated, with separating commas) may be any combination of these letters:

    • 'r': Read.

    • 'w': Write.

    • 'x': Execute (search, for a directory).

    • 'X': Search (for a directories only; must be used with '+')

    • 's': Uid or gid.

    • 't': Sticky bit.

  Examples:

  FileUtils.chmod('u=wrx,go=rx', 'src1.txt')
  FileUtils.chmod('u=wrx,go=rx', '/usr/bin/ruby')
  

Keyword arguments:

• noop: true - does not change permissions; returns nil.

• verbose: true - prints an equivalent command:

  FileUtils.chmod(0755, 'src0.txt', noop: true, verbose: true)
  FileUtils.chmod(0644, ['src0.txt', 'src0.dat'], noop: true, verbose: true)
  FileUtils.chmod('u=wrx,go=rx', 'src1.txt', noop: true, verbose: true)
  FileUtils.chmod('u=wrx,go=rx', '/usr/bin/ruby', noop: true, verbose: true)
  

  Output:

  chmod 755 src0.txt
  chmod 644 src0.txt src0.dat
  chmod u=wrx,go=rx src1.txt
  chmod u=wrx,go=rx /usr/bin/ruby

Related: FileUtils.chmod_R.

# File lib/fileutils.rb, line 1804
def chmod(mode, list, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message sprintf('chmod %s %s', mode_to_s(mode), list.join(' ')) if verbose
  return if noop
  list.each do |path|
    Entry_.new(path).chmod(fu_mode(mode, path))
  end
end

Like FileUtils.chmod, but changes permissions recursively.

# File lib/fileutils.rb, line 1816
def chmod_R(mode, list, noop: nil, verbose: nil, force: nil)
  list = fu_list(list)
  fu_output_message sprintf('chmod -R%s %s %s',
                            (force ? 'f' : ''),
                            mode_to_s(mode), list.join(' ')) if verbose
  return if noop
  list.each do |root|
    Entry_.new(root).traverse do |ent|
      begin
        ent.chmod(fu_mode(mode, ent.path))
      rescue
        raise unless force
      end
    end
  end
end

Changes the owner and group on the entries at the paths given in list (a single path or an array of paths) to the given user and group; returns list if it is an array, [list] otherwise:

• Modifies each entry that is a regular file using File.chown.

• Modifies each entry that is a symbolic link using File.lchown.

Argument list or its elements should be interpretable as paths.

User and group:

• Argument user may be a user name or a user id; if nil or -1, the user is not changed.

• Argument group may be a group name or a group id; if nil or -1, the group is not changed.

• The user must be a member of the group.

Examples:

# One path.
# User and group as string names.
File.stat('src0.txt').uid # => 1004
File.stat('src0.txt').gid # => 1004
FileUtils.chown('user2', 'group1', 'src0.txt')
File.stat('src0.txt').uid # => 1006
File.stat('src0.txt').gid # => 1005

# User and group as uid and gid.
FileUtils.chown(1004, 1004, 'src0.txt')
File.stat('src0.txt').uid # => 1004
File.stat('src0.txt').gid # => 1004

# Array of paths.
FileUtils.chown(1006, 1005, ['src0.txt', 'src0.dat'])

# Directory (not recursive).
FileUtils.chown('user2', 'group1', '.')

Keyword arguments:

• noop: true - does not change permissions; returns nil.

• verbose: true - prints an equivalent command:

  FileUtils.chown('user2', 'group1', 'src0.txt', noop: true, verbose: true)
  FileUtils.chown(1004, 1004, 'src0.txt', noop: true, verbose: true)
  FileUtils.chown(1006, 1005, ['src0.txt', 'src0.dat'], noop: true, verbose: true)
  FileUtils.chown('user2', 'group1', path, noop: true, verbose: true)
  FileUtils.chown('user2', 'group1', '.', noop: true, verbose: true)
  

  Output:

  chown user2:group1 src0.txt
  chown 1004:1004 src0.txt
  chown 1006:1005 src0.txt src0.dat
  chown user2:group1 src0.txt
  chown user2:group1 .

Related: FileUtils.chown_R.

# File lib/fileutils.rb, line 1897
def chown(user, group, list, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message sprintf('chown %s %s',
                            (group ? "#{user}:#{group}" : user || ':'),
                            list.join(' ')) if verbose
  return if noop
  uid = fu_get_uid(user)
  gid = fu_get_gid(group)
  list.each do |path|
    Entry_.new(path).chown uid, gid
  end
end

Like FileUtils.chown, but changes owner and group recursively.

# File lib/fileutils.rb, line 1913
def chown_R(user, group, list, noop: nil, verbose: nil, force: nil)
  list = fu_list(list)
  fu_output_message sprintf('chown -R%s %s %s',
                            (force ? 'f' : ''),
                            (group ? "#{user}:#{group}" : user || ':'),
                            list.join(' ')) if verbose
  return if noop
  uid = fu_get_uid(user)
  gid = fu_get_gid(group)
  list.each do |root|
    Entry_.new(root).traverse do |ent|
      begin
        ent.chown uid, gid
      rescue
        raise unless force
      end
    end
  end
end

Returns an array of the string method names of the methods that accept the given keyword option opt; the argument must be a symbol:

FileUtils.collect_method(:preserve) # => ["cp", "copy", "cp_r", "install"]

# File lib/fileutils.rb, line 2611
def self.collect_method(opt)
  OPT_TABLE.keys.select {|m| OPT_TABLE[m].include?(opt) }
end

Returns an array of the string names of FileUtils methods that accept one or more keyword arguments:

FileUtils.commands.sort.take(3) # => ["cd", "chdir", "chmod"]

# File lib/fileutils.rb, line 2572
def self.commands
  OPT_TABLE.keys
end

Returns true if the contents of files a and b are identical, false otherwise.

Arguments a and b should be interpretable as a path.

FileUtils.identical? and FileUtils.cmp are aliases for FileUtils.compare_file.

Related: FileUtils.compare_stream.

# File lib/fileutils.rb, line 1508
def compare_file(a, b)
  return false unless File.size(a) == File.size(b)
  File.open(a, 'rb') {|fa|
    File.open(b, 'rb') {|fb|
      return compare_stream(fa, fb)
    }
  }
end

Returns true if the contents of streams a and b are identical, false otherwise.

Arguments a and b should be interpretable as a path.

Related: FileUtils.compare_file.

# File lib/fileutils.rb, line 1531
def compare_stream(a, b)
  bsize = fu_stream_blksize(a, b)

  sa = String.new(capacity: bsize)
  sb = String.new(capacity: bsize)

  begin
    a.read(bsize, sa)
    b.read(bsize, sb)
    return true if sa.empty? && sb.empty?
  end while sa == sb
  false
end

Recursively copies files from src to dest.

Arguments src and dest should be interpretable as paths.

If src is the path to a file, copies src to dest:

FileUtils.touch('src0.txt')
File.exist?('dest0.txt') # => false
FileUtils.copy_entry('src0.txt', 'dest0.txt')
File.file?('dest0.txt')  # => true

If src is a directory, recursively copies src to dest:

tree('src1')
# => src1
#    |-- dir0
#    |   |-- src0.txt
#    |   `-- src1.txt
#    `-- dir1
#        |-- src2.txt
#        `-- src3.txt
FileUtils.copy_entry('src1', 'dest1')
tree('dest1')
# => dest1
#    |-- dir0
#    |   |-- src0.txt
#    |   `-- src1.txt
#    `-- dir1
#        |-- src2.txt
#        `-- src3.txt

The recursive copying preserves file types for regular files, directories, and symbolic links; other file types (FIFO streams, device files, etc.) are not supported.

Keyword arguments:

• dereference_root: true - if src is a symbolic link, follows the link.

• preserve: true - preserves file times.

• remove_destination: true - removes dest before copying files.

Related: methods for copying.

# File lib/fileutils.rb, line 1041
def copy_entry(src, dest, preserve = false, dereference_root = false, remove_destination = false)
  if dereference_root
    src = File.realpath(src)
  end

  Entry_.new(src, nil, false).wrap_traverse(proc do |ent|
    destent = Entry_.new(dest, ent.rel, false)
    File.unlink destent.path if remove_destination && (File.file?(destent.path) || File.symlink?(destent.path))
    ent.copy destent.path
  end, proc do |ent|
    destent = Entry_.new(dest, ent.rel, false)
    ent.copy_metadata destent.path if preserve
  end)
end

Copies file from src to dest, which should not be directories.

Arguments src and dest should be interpretable as paths.

Examples:

FileUtils.touch('src0.txt')
FileUtils.copy_file('src0.txt', 'dest0.txt')
File.file?('dest0.txt') # => true

Keyword arguments:

• dereference: false - if src is a symbolic link, does not follow the link.

• preserve: true - preserves file times.

• remove_destination: true - removes dest before copying files.

Related: methods for copying.

# File lib/fileutils.rb, line 1077
def copy_file(src, dest, preserve = false, dereference = true)
  ent = Entry_.new(src, nil, dereference)
  ent.copy_file dest
  ent.copy_metadata dest if preserve
end

Copies IO stream src to IO stream dest via IO.copy_stream.

Related: methods for copying.

# File lib/fileutils.rb, line 1089
def copy_stream(src, dest)
  IO.copy_stream(src, dest)
end

Copies files.

Arguments src (a single path or an array of paths) and dest (a single path) should be interpretable as paths.

If src is the path to a file and dest is not the path to a directory, copies src to dest:

FileUtils.touch('src0.txt')
File.exist?('dest0.txt') # => false
FileUtils.cp('src0.txt', 'dest0.txt')
File.file?('dest0.txt')  # => true

If src is the path to a file and dest is the path to a directory, copies src to dest/src:

FileUtils.touch('src1.txt')
FileUtils.mkdir('dest1')
FileUtils.cp('src1.txt', 'dest1')
File.file?('dest1/src1.txt') # => true

If src is an array of paths to files and dest is the path to a directory, copies from each src to dest:

src_file_paths = ['src2.txt', 'src2.dat']
FileUtils.touch(src_file_paths)
FileUtils.mkdir('dest2')
FileUtils.cp(src_file_paths, 'dest2')
File.file?('dest2/src2.txt') # => true
File.file?('dest2/src2.dat') # => true

Keyword arguments:

• preserve: true - preserves file times.

• noop: true - does not copy files.

• verbose: true - prints an equivalent command:

  FileUtils.cp('src0.txt', 'dest0.txt', noop: true, verbose: true)
  FileUtils.cp('src1.txt', 'dest1', noop: true, verbose: true)
  FileUtils.cp(src_file_paths, 'dest2', noop: true, verbose: true)
  

  Output:

  cp src0.txt dest0.txt
  cp src1.txt dest1
  cp src2.txt src2.dat dest2
  

Raises an exception if src is a directory.

Related: methods for copying.

# File lib/fileutils.rb, line 874
def cp(src, dest, preserve: nil, noop: nil, verbose: nil)
  fu_output_message "cp#{preserve ? ' -p' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest(src, dest) do |s, d|
    copy_file s, d, preserve
  end
end

Creates hard links.

Arguments src (a single path or an array of paths) and dest (a single path) should be interpretable as paths.

If src is the path to a directory and dest does not exist, creates links dest and descendents pointing to src and its descendents:

tree('src0')
# => src0
#    |-- sub0
#    |   |-- src0.txt
#    |   `-- src1.txt
#    `-- sub1
#        |-- src2.txt
#        `-- src3.txt
File.exist?('dest0') # => false
FileUtils.cp_lr('src0', 'dest0')
tree('dest0')
# => dest0
#    |-- sub0
#    |   |-- src0.txt
#    |   `-- src1.txt
#    `-- sub1
#        |-- src2.txt
#        `-- src3.txt

If src and dest are both paths to directories, creates links dest/src and descendents pointing to src and its descendents:

tree('src1')
# => src1
#    |-- sub0
#    |   |-- src0.txt
#    |   `-- src1.txt
#    `-- sub1
#        |-- src2.txt
#        `-- src3.txt
FileUtils.mkdir('dest1')
FileUtils.cp_lr('src1', 'dest1')
tree('dest1')
# => dest1
#    `-- src1
#        |-- sub0
#        |   |-- src0.txt
#        |   `-- src1.txt
#        `-- sub1
#            |-- src2.txt
#            `-- src3.txt

If src is an array of paths to entries and dest is the path to a directory, for each path filepath in src, creates a link at dest/filepath pointing to that path:

tree('src2')
# => src2
#    |-- sub0
#    |   |-- src0.txt
#    |   `-- src1.txt
#    `-- sub1
#        |-- src2.txt
#        `-- src3.txt
FileUtils.mkdir('dest2')
FileUtils.cp_lr(['src2/sub0', 'src2/sub1'], 'dest2')
tree('dest2')
# => dest2
#    |-- sub0
#    |   |-- src0.txt
#    |   `-- src1.txt
#    `-- sub1
#        |-- src2.txt
#        `-- src3.txt

Keyword arguments:

• dereference_root: false - if src is a symbolic link, does not dereference it.

• noop: true - does not create links.

• remove_destination: true - removes dest before creating links.

• verbose: true - prints an equivalent command:

  FileUtils.cp_lr('src0', 'dest0', noop: true, verbose: true)
  FileUtils.cp_lr('src1', 'dest1', noop: true, verbose: true)
  FileUtils.cp_lr(['src2/sub0', 'src2/sub1'], 'dest2', noop: true, verbose: true)
  

  Output:

  cp -lr src0 dest0
  cp -lr src1 dest1
  cp -lr src2/sub0 src2/sub1 dest2

Raises an exception if dest is the path to an existing file or directory and keyword argument remove_destination: true is not given.

Related: methods for copying.

# File lib/fileutils.rb, line 628
def cp_lr(src, dest, noop: nil, verbose: nil,
          dereference_root: true, remove_destination: false)
  fu_output_message "cp -lr#{remove_destination ? ' --remove-destination' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest(src, dest) do |s, d|
    link_entry s, d, dereference_root, remove_destination
  end
end

Recursively copies files.

Arguments src (a single path or an array of paths) and dest (a single path) should be interpretable as paths.

The mode, owner, and group are retained in the copy; to change those, use FileUtils.install instead.

If src is the path to a file and dest is not the path to a directory, copies src to dest:

FileUtils.touch('src0.txt')
File.exist?('dest0.txt') # => false
FileUtils.cp_r('src0.txt', 'dest0.txt')
File.file?('dest0.txt')  # => true

If src is the path to a file and dest is the path to a directory, copies src to dest/src:

FileUtils.touch('src1.txt')
FileUtils.mkdir('dest1')
FileUtils.cp_r('src1.txt', 'dest1')
File.file?('dest1/src1.txt') # => true

If src is the path to a directory and dest does not exist, recursively copies src to dest:

tree('src2')
# => src2
#    |-- dir0
#    |   |-- src0.txt
#    |   `-- src1.txt
#    `-- dir1
#    |-- src2.txt
#    `-- src3.txt
FileUtils.exist?('dest2') # => false
FileUtils.cp_r('src2', 'dest2')
tree('dest2')
# => dest2
#    |-- dir0
#    |   |-- src0.txt
#    |   `-- src1.txt
#    `-- dir1
#    |-- src2.txt
#    `-- src3.txt

If src and dest are paths to directories, recursively copies src to dest/src:

tree('src3')
# => src3
#    |-- dir0
#    |   |-- src0.txt
#    |   `-- src1.txt
#    `-- dir1
#    |-- src2.txt
#    `-- src3.txt
FileUtils.mkdir('dest3')
FileUtils.cp_r('src3', 'dest3')
tree('dest3')
# => dest3
#    `-- src3
#      |-- dir0
#      |   |-- src0.txt
#      |   `-- src1.txt
#      `-- dir1
#          |-- src2.txt
#          `-- src3.txt

If src is an array of paths and dest is a directory, recursively copies from each path in src to dest; the paths in src may point to files and/or directories.

Keyword arguments:

• dereference_root: false - if src is a symbolic link, does not dereference it.

• noop: true - does not copy files.

• preserve: true - preserves file times.

• remove_destination: true - removes dest before copying files.

• verbose: true - prints an equivalent command:

  FileUtils.cp_r('src0.txt', 'dest0.txt', noop: true, verbose: true)
  FileUtils.cp_r('src1.txt', 'dest1', noop: true, verbose: true)
  FileUtils.cp_r('src2', 'dest2', noop: true, verbose: true)
  FileUtils.cp_r('src3', 'dest3', noop: true, verbose: true)
  

  Output:

  cp -r src0.txt dest0.txt
  cp -r src1.txt dest1
  cp -r src2 dest2
  cp -r src3 dest3

Raises an exception of src is the path to a directory and dest is the path to a file.

Related: methods for copying.

# File lib/fileutils.rb, line 986
def cp_r(src, dest, preserve: nil, noop: nil, verbose: nil,
         dereference_root: true, remove_destination: nil)
  fu_output_message "cp -r#{preserve ? 'p' : ''}#{remove_destination ? ' --remove-destination' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest(src, dest) do |s, d|
    copy_entry s, d, preserve, dereference_root, remove_destination
  end
end

Returns true if method mid accepts the given option opt, false otherwise; the arguments may be strings or symbols:

FileUtils.have_option?(:chmod, :noop) # => true
FileUtils.have_option?('chmod', 'secure') # => false

# File lib/fileutils.rb, line 2590
def self.have_option?(mid, opt)
  li = OPT_TABLE[mid.to_s] or raise ArgumentError, "no such method: #{mid}"
  li.include?(opt)
end

Copies a file entry. See install(1).

Arguments src (a single path or an array of paths) and dest (a single path) should be interpretable as paths;

If the entry at dest does not exist, copies from src to dest:

File.read('src0.txt')    # => "aaa\n"
File.exist?('dest0.txt') # => false
FileUtils.install('src0.txt', 'dest0.txt')
File.read('dest0.txt')   # => "aaa\n"

If dest is a file entry, copies from src to dest, overwriting:

File.read('src1.txt')  # => "aaa\n"
File.read('dest1.txt') # => "bbb\n"
FileUtils.install('src1.txt', 'dest1.txt')
File.read('dest1.txt') # => "aaa\n"

If dest is a directory entry, copies from src to dest/src, overwriting if necessary:

File.read('src2.txt')       # => "aaa\n"
File.read('dest2/src2.txt') # => "bbb\n"
FileUtils.install('src2.txt', 'dest2')
File.read('dest2/src2.txt') # => "aaa\n"

If src is an array of paths and dest points to a directory, copies each path path in src to dest/path:

File.file?('src3.txt') # => true
File.file?('src3.dat') # => true
FileUtils.mkdir('dest3')
FileUtils.install(['src3.txt', 'src3.dat'], 'dest3')
File.file?('dest3/src3.txt') # => true
File.file?('dest3/src3.dat') # => true

Keyword arguments:

• group: group - changes the group if not nil, using File.chown.

• mode: permissions - changes the permissions. using File.chmod.

• noop: true - does not copy entries; returns nil.

• owner: owner - changes the owner if not nil, using File.chown.

• preserve: true - preserve timestamps using File.utime.

• verbose: true - prints an equivalent command:

  FileUtils.install('src0.txt', 'dest0.txt', noop: true, verbose: true)
  FileUtils.install('src1.txt', 'dest1.txt', noop: true, verbose: true)
  FileUtils.install('src2.txt', 'dest2', noop: true, verbose: true)
  

  Output:

  install -c src0.txt dest0.txt
  install -c src1.txt dest1.txt
  install -c src2.txt dest2

Related: methods for copying.

# File lib/fileutils.rb, line 1610
def install(src, dest, mode: nil, owner: nil, group: nil, preserve: nil,
            noop: nil, verbose: nil)
  if verbose
    msg = +"install -c"
    msg << ' -p' if preserve
    msg << ' -m ' << mode_to_s(mode) if mode
    msg << " -o #{owner}" if owner
    msg << " -g #{group}" if group
    msg << ' ' << [src,dest].flatten.join(' ')
    fu_output_message msg
  end
  return if noop
  uid = fu_get_uid(owner)
  gid = fu_get_gid(group)
  fu_each_src_dest(src, dest) do |s, d|
    st = File.stat(s)
    unless File.exist?(d) and compare_file(s, d)
      remove_file d, true
      if d.end_with?('/')
        mkdir_p d
        copy_file s, d + File.basename(s)
      else
        mkdir_p File.expand_path('..', d)
        copy_file s, d
      end
      File.utime st.atime, st.mtime, d if preserve
      File.chmod fu_mode(mode, st), d if mode
      File.chown uid, gid, d if uid or gid
    end
  end
end

Creates hard links; returns nil.

Arguments src and dest should be interpretable as paths.

If src is the path to a file and dest does not exist, creates a hard link at dest pointing to src:

FileUtils.touch('src0.txt')
File.exist?('dest0.txt') # => false
FileUtils.link_entry('src0.txt', 'dest0.txt')
File.file?('dest0.txt')  # => true

If src is the path to a directory and dest does not exist, recursively creates hard links at dest pointing to paths in src:

FileUtils.mkdir_p(['src1/dir0', 'src1/dir1'])
src_file_paths = [
  'src1/dir0/t0.txt',
  'src1/dir0/t1.txt',
  'src1/dir1/t2.txt',
  'src1/dir1/t3.txt',
  ]
FileUtils.touch(src_file_paths)
File.directory?('dest1')        # => true
FileUtils.link_entry('src1', 'dest1')
File.file?('dest1/dir0/t0.txt') # => true
File.file?('dest1/dir0/t1.txt') # => true
File.file?('dest1/dir1/t2.txt') # => true
File.file?('dest1/dir1/t3.txt') # => true

Keyword arguments:

• dereference_root: true - dereferences src if it is a symbolic link.

• remove_destination: true - removes dest before creating links.

Raises an exception if dest is the path to an existing file or directory and keyword argument remove_destination: true is not given.

Related: FileUtils.ln (has different options).

# File lib/fileutils.rb, line 813
def link_entry(src, dest, dereference_root = false, remove_destination = false)
  Entry_.new(src, nil, dereference_root).traverse do |ent|
    destent = Entry_.new(dest, ent.rel, false)
    File.unlink destent.path if remove_destination && File.file?(destent.path)
    ent.link destent.path
  end
end

Creates hard links.

Arguments src (a single path or an array of paths) and dest (a single path) should be interpretable as paths.

When src is the path to an existing file and dest is the path to a non-existent file, creates a hard link at dest pointing to src; returns zero:

Dir.children('tmp0/')                    # => ["t.txt"]
Dir.children('tmp1/')                    # => []
FileUtils.ln('tmp0/t.txt', 'tmp1/t.lnk') # => 0
Dir.children('tmp1/')                    # => ["t.lnk"]

When src is the path to an existing file and dest is the path to an existing directory, creates a hard link at dest/src pointing to src; returns zero:

Dir.children('tmp2')               # => ["t.dat"]
Dir.children('tmp3')               # => []
FileUtils.ln('tmp2/t.dat', 'tmp3') # => 0
Dir.children('tmp3')               # => ["t.dat"]

When src is an array of paths to existing files and dest is the path to an existing directory, then for each path target in src, creates a hard link at dest/target pointing to target; returns src:

Dir.children('tmp4/')                               # => []
FileUtils.ln(['tmp0/t.txt', 'tmp2/t.dat'], 'tmp4/') # => ["tmp0/t.txt", "tmp2/t.dat"]
Dir.children('tmp4/')                               # => ["t.dat", "t.txt"]

Keyword arguments:

• force: true - overwrites dest if it exists.

• noop: true - does not create links.

• verbose: true - prints an equivalent command:

  FileUtils.ln('tmp0/t.txt', 'tmp1/t.lnk', verbose: true)
  FileUtils.ln('tmp2/t.dat', 'tmp3', verbose: true)
  FileUtils.ln(['tmp0/t.txt', 'tmp2/t.dat'], 'tmp4/', verbose: true)
  

  Output:

  ln tmp0/t.txt tmp1/t.lnk
  ln tmp2/t.dat tmp3
  ln tmp0/t.txt tmp2/t.dat tmp4/

Raises an exception if dest is the path to an existing file and keyword argument force is not true.

Related: FileUtils.link_entry (has different options).

# File lib/fileutils.rb, line 517
def ln(src, dest, force: nil, noop: nil, verbose: nil)
  fu_output_message "ln#{force ? ' -f' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest0(src, dest) do |s,d|
    remove_file d, true if force
    File.link s, d
  end
end

Creates symbolic links.

Arguments src (a single path or an array of paths) and dest (a single path) should be interpretable as paths.

If src is the path to an existing file:

• When dest is the path to a non-existent file, creates a symbolic link at dest pointing to src:

  FileUtils.touch('src0.txt')
  File.exist?('dest0.txt')   # => false
  FileUtils.ln_s('src0.txt', 'dest0.txt')
  File.symlink?('dest0.txt') # => true
  

• When dest is the path to an existing file, creates a symbolic link at dest pointing to src if and only if keyword argument force: true is given (raises an exception otherwise):

  FileUtils.touch('src1.txt')
  FileUtils.touch('dest1.txt')
  FileUtils.ln_s('src1.txt', 'dest1.txt', force: true)
  FileTest.symlink?('dest1.txt') # => true
  
  FileUtils.ln_s('src1.txt', 'dest1.txt') # Raises Errno::EEXIST.
  

If dest is the path to a directory, creates a symbolic link at dest/src pointing to src:

FileUtils.touch('src2.txt')
FileUtils.mkdir('destdir2')
FileUtils.ln_s('src2.txt', 'destdir2')
File.symlink?('destdir2/src2.txt') # => true

If src is an array of paths to existing files and dest is a directory, for each child child in src creates a symbolic link dest/child pointing to child:

FileUtils.mkdir('srcdir3')
FileUtils.touch('srcdir3/src0.txt')
FileUtils.touch('srcdir3/src1.txt')
FileUtils.mkdir('destdir3')
FileUtils.ln_s(['srcdir3/src0.txt', 'srcdir3/src1.txt'], 'destdir3')
File.symlink?('destdir3/src0.txt') # => true
File.symlink?('destdir3/src1.txt') # => true

Keyword arguments:

• force: true - overwrites dest if it exists.

• relative: false - create links relative to dest.

• noop: true - does not create links.

• verbose: true - prints an equivalent command:

  FileUtils.ln_s('src0.txt', 'dest0.txt', noop: true, verbose: true)
  FileUtils.ln_s('src1.txt', 'destdir1', noop: true, verbose: true)
  FileUtils.ln_s('src2.txt', 'dest2.txt', force: true, noop: true, verbose: true)
  FileUtils.ln_s(['srcdir3/src0.txt', 'srcdir3/src1.txt'], 'destdir3', noop: true, verbose: true)
  

  Output:

  ln -s src0.txt dest0.txt
  ln -s src1.txt destdir1
  ln -sf src2.txt dest2.txt
  ln -s srcdir3/src0.txt srcdir3/src1.txt destdir3

Related: FileUtils.ln_sf.

# File lib/fileutils.rb, line 707
def ln_s(src, dest, force: nil, relative: false, target_directory: true, noop: nil, verbose: nil)
  if relative
    return ln_sr(src, dest, force: force, noop: noop, verbose: verbose)
  end
  fu_output_message "ln -s#{force ? 'f' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest0(src, dest) do |s,d|
    remove_file d, true if force
    File.symlink s, d
  end
end

Like FileUtils.ln_s, but always with keyword argument force: true given.

# File lib/fileutils.rb, line 725
def ln_sf(src, dest, noop: nil, verbose: nil)
  ln_s src, dest, force: true, noop: noop, verbose: verbose
end

Like FileUtils.ln_s, but create links relative to dest.

# File lib/fileutils.rb, line 732
def ln_sr(src, dest, target_directory: true, force: nil, noop: nil, verbose: nil)
  options = "#{force ? 'f' : ''}#{target_directory ? '' : 'T'}"
  dest = File.path(dest)
  srcs = Array(src)
  link = proc do |s, target_dir_p = true|
    s = File.path(s)
    if target_dir_p
      d = File.join(destdirs = dest, File.basename(s))
    else
      destdirs = File.dirname(d = dest)
    end
    destdirs = fu_split_path(File.realpath(destdirs))
    if fu_starting_path?(s)
      srcdirs = fu_split_path((File.realdirpath(s) rescue File.expand_path(s)))
      base = fu_relative_components_from(srcdirs, destdirs)
      s = File.join(*base)
    else
      srcdirs = fu_clean_components(*fu_split_path(s))
      base = fu_relative_components_from(fu_split_path(Dir.pwd), destdirs)
      while srcdirs.first&. == ".." and base.last&.!=("..") and !fu_starting_path?(base.last)
        srcdirs.shift
        base.pop
      end
      s = File.join(*base, *srcdirs)
    end
    fu_output_message "ln -s#{options} #{s} #{d}" if verbose
    next if noop
    remove_file d, true if force
    File.symlink s, d
  end
  case srcs.size
  when 0
  when 1
    link[srcs[0], target_directory && File.directory?(dest)]
  else
    srcs.each(&link)
  end
end

Creates directories at the paths in the given list (a single path or an array of paths); returns list if it is an array, [list] otherwise.

Argument list or its elements should be interpretable as paths.

With no keyword arguments, creates a directory at each path in list by calling: Dir.mkdir(path, mode); see Dir.mkdir:

FileUtils.mkdir(%w[tmp0 tmp1]) # => ["tmp0", "tmp1"]
FileUtils.mkdir('tmp4')        # => ["tmp4"]

Keyword arguments:

• mode: mode - also calls File.chmod(mode, path); see File.chmod.

• noop: true - does not create directories.

• verbose: true - prints an equivalent command:

  FileUtils.mkdir(%w[tmp0 tmp1], verbose: true)
  FileUtils.mkdir(%w[tmp2 tmp3], mode: 0700, verbose: true)
  

  Output:

  mkdir tmp0 tmp1
  mkdir -m 700 tmp2 tmp3

Raises an exception if any path points to an existing file or directory, or if for any reason a directory cannot be created.

Related: FileUtils.mkdir_p.

# File lib/fileutils.rb, line 317
def mkdir(list, mode: nil, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message "mkdir #{mode ? ('-m %03o ' % mode) : ''}#{list.join ' '}" if verbose
  return if noop

  list.each do |dir|
    fu_mkdir dir, mode
  end
end

Creates directories at the paths in the given list (a single path or an array of paths), also creating ancestor directories as needed; returns list if it is an array, [list] otherwise.

Argument list or its elements should be interpretable as paths.

With no keyword arguments, creates a directory at each path in list, along with any needed ancestor directories, by calling: Dir.mkdir(path, mode); see Dir.mkdir:

FileUtils.mkdir_p(%w[tmp0/tmp1 tmp2/tmp3]) # => ["tmp0/tmp1", "tmp2/tmp3"]
FileUtils.mkdir_p('tmp4/tmp5')             # => ["tmp4/tmp5"]

Keyword arguments:

• mode: mode - also calls File.chmod(mode, path); see File.chmod.

• noop: true - does not create directories.

• verbose: true - prints an equivalent command:

  FileUtils.mkdir_p(%w[tmp0 tmp1], verbose: true)
  FileUtils.mkdir_p(%w[tmp2 tmp3], mode: 0700, verbose: true)
  

  Output:

  mkdir -p tmp0 tmp1
  mkdir -p -m 700 tmp2 tmp3

Raises an exception if for any reason a directory cannot be created.

FileUtils.mkpath and FileUtils.makedirs are aliases for FileUtils.mkdir_p.

Related: FileUtils.mkdir.

# File lib/fileutils.rb, line 366
def mkdir_p(list, mode: nil, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message "mkdir -p #{mode ? ('-m %03o ' % mode) : ''}#{list.join ' '}" if verbose
  return *list if noop

  list.each do |item|
    path = remove_trailing_slash(item)

    stack = []
    until File.directory?(path) || File.dirname(path) == path
      stack.push path
      path = File.dirname(path)
    end
    stack.reverse_each do |dir|
      begin
        fu_mkdir dir, mode
      rescue SystemCallError
        raise unless File.directory?(dir)
      end
    end
  end

  return *list
end

Moves entries.

Arguments src (a single path or an array of paths) and dest (a single path) should be interpretable as paths.

If src and dest are on different file systems, first copies, then removes src.

May cause a local vulnerability if not called with keyword argument secure: true; see Avoiding the TOCTTOU Vulnerability.

If src is the path to a single file or directory and dest does not exist, moves src to dest:

tree('src0')
# => src0
#    |-- src0.txt
#    `-- src1.txt
File.exist?('dest0') # => false
FileUtils.mv('src0', 'dest0')
File.exist?('src0')  # => false
tree('dest0')
# => dest0
#    |-- src0.txt
#    `-- src1.txt

If src is an array of paths to files and directories and dest is the path to a directory, copies from each path in the array to dest:

File.file?('src1.txt') # => true
tree('src1')
# => src1
#    |-- src.dat
#    `-- src.txt
Dir.empty?('dest1')    # => true
FileUtils.mv(['src1.txt', 'src1'], 'dest1')
tree('dest1')
# => dest1
#    |-- src1
#    |   |-- src.dat
#    |   `-- src.txt
#    `-- src1.txt

Keyword arguments:

• force: true - if the move includes removing src (that is, if src and dest are on different file systems), ignores raised exceptions of StandardError and its descendants.

• noop: true - does not move files.

• secure: true - removes src securely; see details at FileUtils.remove_entry_secure.

• verbose: true - prints an equivalent command:

  FileUtils.mv('src0', 'dest0', noop: true, verbose: true)
  FileUtils.mv(['src1.txt', 'src1'], 'dest1', noop: true, verbose: true)
  

  Output:

  mv src0 dest0
  mv src1.txt src1 dest1
  

# File lib/fileutils.rb, line 1158
def mv(src, dest, force: nil, noop: nil, verbose: nil, secure: nil)
  fu_output_message "mv#{force ? ' -f' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest(src, dest) do |s, d|
    destent = Entry_.new(d, nil, true)
    begin
      if destent.exist?
        if destent.directory?
          raise Errno::EEXIST, d
        end
      end
      begin
        File.rename s, d
      rescue Errno::EXDEV,
             Errno::EPERM # move from unencrypted to encrypted dir (ext4)
        copy_entry s, d, true
        if secure
          remove_entry_secure s, force
        else
          remove_entry s, force
        end
      end
    rescue SystemCallError
      raise unless force
    end
  end
end

Returns an array of the string keyword names:

FileUtils.options.take(3) # => ["noop", "verbose", "force"]

# File lib/fileutils.rb, line 2580
def self.options
  OPT_TABLE.values.flatten.uniq.map {|sym| sym.to_s }
end

Returns an array of the string keyword name for method mid; the argument may be a string or a symbol:

FileUtils.options_of(:rm) # => ["force", "noop", "verbose"]
FileUtils.options_of('mv') # => ["force", "noop", "verbose", "secure"]

# File lib/fileutils.rb, line 2601
def self.options_of(mid)
  OPT_TABLE[mid.to_s].map {|sym| sym.to_s }
end

Returns a string containing the path to the current directory:

FileUtils.pwd # => "/rdoc/fileutils"

Related: FileUtils.cd.

# File lib/fileutils.rb, line 198
def pwd
  Dir.pwd
end

Recursively removes the directory entry given by path, which should be the entry for a regular file, a symbolic link, or a directory.

Argument path should be interpretable as a path.

Optional argument force specifies whether to ignore raised exceptions of StandardError and its descendants.

Related: methods for deleting.

# File lib/fileutils.rb, line 1493
def remove_dir(path, force = false)
  remove_entry path, force   # FIXME?? check if it is a directory
end

Removes the entry given by path, which should be the entry for a regular file, a symbolic link, or a directory.

Argument path should be interpretable as a path.

Optional argument force specifies whether to ignore raised exceptions of StandardError and its descendants.

Related: FileUtils.remove_entry_secure.

# File lib/fileutils.rb, line 1450
def remove_entry(path, force = false)
  Entry_.new(path).postorder_traverse do |ent|
    begin
      ent.remove
    rescue
      raise unless force
    end
  end
rescue
  raise unless force
end

Securely removes the entry given by path, which should be the entry for a regular file, a symbolic link, or a directory.

Argument path should be interpretable as a path.

Avoids a local vulnerability that can exist in certain circumstances; see Avoiding the TOCTTOU Vulnerability.

Optional argument force specifies whether to ignore raised exceptions of StandardError and its descendants.

Related: methods for deleting.

# File lib/fileutils.rb, line 1352
def remove_entry_secure(path, force = false)
  unless fu_have_symlink?
    remove_entry path, force
    return
  end
  fullpath = File.expand_path(path)
  st = File.lstat(fullpath)
  unless st.directory?
    File.unlink fullpath
    return
  end
  # is a directory.
  parent_st = File.stat(File.dirname(fullpath))
  unless parent_st.world_writable?
    remove_entry path, force
    return
  end
  unless parent_st.sticky?
    raise ArgumentError, "parent directory is world writable, FileUtils#remove_entry_secure does not work; abort: #{path.inspect} (parent directory mode #{'%o' % parent_st.mode})"
  end

  # freeze tree root
  euid = Process.euid
  dot_file = fullpath + "/."
  begin
    File.open(dot_file) {|f|
      unless fu_stat_identical_entry?(st, f.stat)
        # symlink (TOC-to-TOU attack?)
        File.unlink fullpath
        return
      end
      f.chown euid, -1
      f.chmod 0700
    }
  rescue Errno::EISDIR # JRuby in non-native mode can't open files as dirs
    File.lstat(dot_file).tap {|fstat|
      unless fu_stat_identical_entry?(st, fstat)
        # symlink (TOC-to-TOU attack?)
        File.unlink fullpath
        return
      end
      File.chown euid, -1, dot_file
      File.chmod 0700, dot_file
    }
  end

  unless fu_stat_identical_entry?(st, File.lstat(fullpath))
    # TOC-to-TOU attack?
    File.unlink fullpath
    return
  end

  # ---- tree root is frozen ----
  root = Entry_.new(path)
  root.preorder_traverse do |ent|
    if ent.directory?
      ent.chown euid, -1
      ent.chmod 0700
    end
  end
  root.postorder_traverse do |ent|
    begin
      ent.remove
    rescue
      raise unless force
    end
  end
rescue
  raise unless force
end

Removes the file entry given by path, which should be the entry for a regular file or a symbolic link.

Argument path should be interpretable as a path.

Optional argument force specifies whether to ignore raised exceptions of StandardError and its descendants.

Related: methods for deleting.

# File lib/fileutils.rb, line 1474
def remove_file(path, force = false)
  Entry_.new(path).remove_file
rescue
  raise unless force
end

Removes entries at the paths in the given list (a single path or an array of paths) returns list, if it is an array, [list] otherwise.

Argument list or its elements should be interpretable as paths.

With no keyword arguments, removes files at the paths given in list:

FileUtils.touch(['src0.txt', 'src0.dat'])
FileUtils.rm(['src0.dat', 'src0.txt']) # => ["src0.dat", "src0.txt"]

Keyword arguments:

• force: true - ignores raised exceptions of StandardError and its descendants.

• noop: true - does not remove files; returns nil.

• verbose: true - prints an equivalent command:

  FileUtils.rm(['src0.dat', 'src0.txt'], noop: true, verbose: true)
  

  Output:

  rm src0.dat src0.txt
  

Related: methods for deleting.

# File lib/fileutils.rb, line 1217
def rm(list, force: nil, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message "rm#{force ? ' -f' : ''} #{list.join ' '}" if verbose
  return if noop

  list.each do |path|
    remove_file path, force
  end
end

Equivalent to:

FileUtils.rm(list, force: true, **kwargs)

Argument list (a single path or an array of paths) should be interpretable as paths.

See FileUtils.rm for keyword arguments.

Related: methods for deleting.

# File lib/fileutils.rb, line 1242
def rm_f(list, noop: nil, verbose: nil)
  rm list, force: true, noop: noop, verbose: verbose
end

Removes entries at the paths in the given list (a single path or an array of paths); returns list, if it is an array, [list] otherwise.

Argument list or its elements should be interpretable as paths.

May cause a local vulnerability if not called with keyword argument secure: true; see Avoiding the TOCTTOU Vulnerability.

For each file path, removes the file at that path:

FileUtils.touch(['src0.txt', 'src0.dat'])
FileUtils.rm_r(['src0.dat', 'src0.txt'])
File.exist?('src0.txt') # => false
File.exist?('src0.dat') # => false

For each directory path, recursively removes files and directories:

tree('src1')
# => src1
#    |-- dir0
#    |   |-- src0.txt
#    |   `-- src1.txt
#    `-- dir1
#        |-- src2.txt
#        `-- src3.txt
FileUtils.rm_r('src1')
File.exist?('src1') # => false

Keyword arguments:

• force: true - ignores raised exceptions of StandardError and its descendants.

• noop: true - does not remove entries; returns nil.

• secure: true - removes src securely; see details at FileUtils.remove_entry_secure.

• verbose: true - prints an equivalent command:

  FileUtils.rm_r(['src0.dat', 'src0.txt'], noop: true, verbose: true)
  FileUtils.rm_r('src1', noop: true, verbose: true)
  

  Output:

  rm -r src0.dat src0.txt
  rm -r src1

Related: methods for deleting.

# File lib/fileutils.rb, line 1300
def rm_r(list, force: nil, noop: nil, verbose: nil, secure: nil)
  list = fu_list(list)
  fu_output_message "rm -r#{force ? 'f' : ''} #{list.join ' '}" if verbose
  return if noop
  list.each do |path|
    if secure
      remove_entry_secure path, force
    else
      remove_entry path, force
    end
  end
end

Equivalent to:

FileUtils.rm_r(list, force: true, **kwargs)

Argument list or its elements should be interpretable as paths.

May cause a local vulnerability if not called with keyword argument secure: true; see Avoiding the TOCTTOU Vulnerability.

See FileUtils.rm_r for keyword arguments.

Related: methods for deleting.

# File lib/fileutils.rb, line 1329
def rm_rf(list, noop: nil, verbose: nil, secure: nil)
  rm_r list, force: true, noop: noop, verbose: verbose, secure: secure
end

Removes directories at the paths in the given list (a single path or an array of paths); returns list, if it is an array, [list] otherwise.

Argument list or its elements should be interpretable as paths.

With no keyword arguments, removes the directory at each path in list, by calling: Dir.rmdir(path); see Dir.rmdir:

FileUtils.rmdir(%w[tmp0/tmp1 tmp2/tmp3]) # => ["tmp0/tmp1", "tmp2/tmp3"]
FileUtils.rmdir('tmp4/tmp5')             # => ["tmp4/tmp5"]

Keyword arguments:

• parents: true - removes successive ancestor directories if empty.

• noop: true - does not remove directories.

• verbose: true - prints an equivalent command:

  FileUtils.rmdir(%w[tmp0/tmp1 tmp2/tmp3], parents: true, verbose: true)
  FileUtils.rmdir('tmp4/tmp5', parents: true, verbose: true)
  

  Output:

  rmdir -p tmp0/tmp1 tmp2/tmp3
  rmdir -p tmp4/tmp5

Raises an exception if a directory does not exist or if for any reason a directory cannot be removed.

Related: methods for deleting.

# File lib/fileutils.rb, line 443
def rmdir(list, parents: nil, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message "rmdir #{parents ? '-p ' : ''}#{list.join ' '}" if verbose
  return if noop
  list.each do |dir|
    Dir.rmdir(dir = remove_trailing_slash(dir))
    if parents
      begin
        until (parent = File.dirname(dir)) == '.' or parent == dir
          dir = parent
          Dir.rmdir(dir)
        end
      rescue Errno::ENOTEMPTY, Errno::EEXIST, Errno::ENOENT
      end
    end
  end
end

Updates modification times (mtime) and access times (atime) of the entries given by the paths in list (a single path or an array of paths); returns list if it is an array, [list] otherwise.

By default, creates an empty file for any path to a non-existent entry; use keyword argument nocreate to raise an exception instead.

Argument list or its elements should be interpretable as paths.

Examples:

# Single path.
f = File.new('src0.txt') # Existing file.
f.atime # => 2022-06-10 11:11:21.200277 -0700
f.mtime # => 2022-06-10 11:11:21.200277 -0700
FileUtils.touch('src0.txt')
f = File.new('src0.txt')
f.atime # => 2022-06-11 08:28:09.8185343 -0700
f.mtime # => 2022-06-11 08:28:09.8185343 -0700

# Array of paths.
FileUtils.touch(['src0.txt', 'src0.dat'])

Keyword arguments:

• mtime: time - sets the entry’s mtime to the given time, instead of the current time.

• nocreate: true - raises an exception if the entry does not exist.

• noop: true - does not touch entries; returns nil.

• verbose: true - prints an equivalent command:

  FileUtils.touch('src0.txt', noop: true, verbose: true)
  FileUtils.touch(['src0.txt', 'src0.dat'], noop: true, verbose: true)
  FileUtils.touch(path, noop: true, verbose: true)
  

  Output:

  touch src0.txt
  touch src0.txt src0.dat
  touch src0.txt
  

Related: FileUtils.uptodate?.

# File lib/fileutils.rb, line 2007
def touch(list, noop: nil, verbose: nil, mtime: nil, nocreate: nil)
  list = fu_list(list)
  t = mtime
  if verbose
    fu_output_message "touch #{nocreate ? '-c ' : ''}#{t ? t.strftime('-t %Y%m%d%H%M.%S ') : ''}#{list.join ' '}"
  end
  return if noop
  list.each do |path|
    created = nocreate
    begin
      File.utime(t, t, path)
    rescue Errno::ENOENT
      raise if created
      File.open(path, 'a') {
        ;
      }
      created = true
      retry if t
    end
  end
end

Returns true if the file at path new is newer than all the files at paths in array old_list; false otherwise.

Argument new and the elements of old_list should be interpretable as paths:

FileUtils.uptodate?('Rakefile', ['Gemfile', 'README.md']) # => true
FileUtils.uptodate?('Gemfile', ['Rakefile', 'README.md']) # => false

A non-existent file is considered to be infinitely old.

Related: FileUtils.touch.

# File lib/fileutils.rb, line 265
def uptodate?(new, old_list)
  return false unless File.exist?(new)
  new_time = File.mtime(new)
  old_list.each do |old|
    if File.exist?(old)
      return false unless new_time > File.mtime(old)
    end
  end
  true
end