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Edit File : fileutils.rb \| Size : 47.74 KB
# frozen_string_literal: true begin require 'rbconfig' rescue LoadError # for make mjit-headers end # # = fileutils.rb # # Copyright (c) 2000-2007 Minero Aoki # # This program is free software. # You can distribute/modify this program under the same terms of ruby. # # == module FileUtils # # Namespace for several file utility methods for copying, moving, removing, etc. # # === Module Functions # # require 'fileutils' # # FileUtils.cd(dir, options) # FileUtils.cd(dir, options) {\|dir\| block } # FileUtils.pwd() # FileUtils.mkdir(dir, options) # FileUtils.mkdir(list, options) # FileUtils.mkdir_p(dir, options) # FileUtils.mkdir_p(list, options) # FileUtils.rmdir(dir, options) # FileUtils.rmdir(list, options) # FileUtils.ln(target, link, options) # FileUtils.ln(targets, dir, options) # FileUtils.ln_s(target, link, options) # FileUtils.ln_s(targets, dir, options) # FileUtils.ln_sf(target, link, options) # FileUtils.cp(src, dest, options) # FileUtils.cp(list, dir, options) # FileUtils.cp_r(src, dest, options) # FileUtils.cp_r(list, dir, options) # FileUtils.mv(src, dest, options) # FileUtils.mv(list, dir, options) # FileUtils.rm(list, options) # FileUtils.rm_r(list, options) # FileUtils.rm_rf(list, options) # FileUtils.install(src, dest, options) # FileUtils.chmod(mode, list, options) # FileUtils.chmod_R(mode, list, options) # FileUtils.chown(user, group, list, options) # FileUtils.chown_R(user, group, list, options) # FileUtils.touch(list, options) # # Possible <tt>options</tt> are: # # <tt>:force</tt> :: forced operation (rewrite files if exist, remove # directories if not empty, etc.); # <tt>:verbose</tt> :: print command to be run, in bash syntax, before # performing it; # <tt>:preserve</tt> :: preserve object's group, user and modification # time on copying; # <tt>:noop</tt> :: no changes are made (usable in combination with # <tt>:verbose</tt> which will print the command to run) # # Each method documents the options that it honours. See also ::commands, # ::options and ::options_of methods to introspect which command have which # options. # # All methods that have the concept of a "source" file or directory can take # either one file or a list of files in that argument. See the method # documentation for examples. # # There are some `low level' methods, which do not accept keyword arguments: # # FileUtils.copy_entry(src, dest, preserve = false, dereference_root = false, remove_destination = false) # FileUtils.copy_file(src, dest, preserve = false, dereference = true) # FileUtils.copy_stream(srcstream, deststream) # FileUtils.remove_entry(path, force = false) # FileUtils.remove_entry_secure(path, force = false) # FileUtils.remove_file(path, force = false) # FileUtils.compare_file(path_a, path_b) # FileUtils.compare_stream(stream_a, stream_b) # FileUtils.uptodate?(file, cmp_list) # # == module FileUtils::Verbose # # This module has all methods of FileUtils module, but it outputs messages # before acting. This equates to passing the <tt>:verbose</tt> flag to methods # in FileUtils. # # == module FileUtils::NoWrite # # This module has all methods of FileUtils module, but never changes # files/directories. This equates to passing the <tt>:noop</tt> flag to methods # in FileUtils. # # == module FileUtils::DryRun # # This module has all methods of FileUtils module, but never changes # files/directories. This equates to passing the <tt>:noop</tt> and # <tt>:verbose</tt> flags to methods in FileUtils. # module FileUtils VERSION = "1.6.0" def self.private_module_function(name) #:nodoc: module_function name private_class_method name end # # Returns the name of the current directory. # def pwd Dir.pwd end module_function :pwd alias getwd pwd module_function :getwd # # Changes the current directory to the directory +dir+. # # If this method is called with block, resumes to the previous # working directory after the block execution has finished. # # FileUtils.cd('/') # change directory # # FileUtils.cd('/', verbose: true) # change directory and report it # # FileUtils.cd('/') do # change directory # # ... # do something # end # return to original directory # 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 module_function :cd alias chdir cd module_function :chdir # # Returns true if +new+ is newer than all +old_list+. # Non-existent files are older than any file. # # FileUtils.uptodate?('hello.o', %w(hello.c hello.h)) or \ # system 'make hello.o' # 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 module_function :uptodate? def remove_trailing_slash(dir) #:nodoc: dir == '/' ? dir : dir.chomp(?/) end private_module_function :remove_trailing_slash # # Creates one or more directories. # # FileUtils.mkdir 'test' # FileUtils.mkdir %w(tmp data) # FileUtils.mkdir 'notexist', noop: true # Does not really create. # FileUtils.mkdir 'tmp', mode: 0700 # 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 module_function :mkdir # # Creates a directory and all its parent directories. # For example, # # FileUtils.mkdir_p '/usr/local/lib/ruby' # # causes to make following directories, if they do not exist. # # * /usr # * /usr/local # * /usr/local/lib # * /usr/local/lib/ruby # # You can pass several directories at a time in a list. # 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 module_function :mkdir_p alias mkpath mkdir_p alias makedirs mkdir_p module_function :mkpath module_function :makedirs def fu_mkdir(path, mode) #:nodoc: path = remove_trailing_slash(path) if mode Dir.mkdir path, mode File.chmod mode, path else Dir.mkdir path end end private_module_function :fu_mkdir # # Removes one or more directories. # # FileUtils.rmdir 'somedir' # FileUtils.rmdir %w(somedir anydir otherdir) # # Does not really remove directory; outputs message. # FileUtils.rmdir 'somedir', verbose: true, noop: true # 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 module_function :rmdir # # :call-seq: # FileUtils.ln(target, link, force: nil, noop: nil, verbose: nil) # FileUtils.ln(target, dir, force: nil, noop: nil, verbose: nil) # FileUtils.ln(targets, dir, force: nil, noop: nil, verbose: nil) # # In the first form, creates a hard link +link+ which points to +target+. # If +link+ already exists, raises Errno::EEXIST. # But if the +force+ option is set, overwrites +link+. # # FileUtils.ln 'gcc', 'cc', verbose: true # FileUtils.ln '/usr/bin/emacs21', '/usr/bin/emacs' # # In the second form, creates a link +dir/target+ pointing to +target+. # In the third form, creates several hard links in the directory +dir+, # pointing to each item in +targets+. # If +dir+ is not a directory, raises Errno::ENOTDIR. # # FileUtils.cd '/sbin' # FileUtils.ln %w(cp mv mkdir), '/bin' # Now /sbin/cp and /bin/cp are linked. # 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 module_function :ln alias link ln module_function :link # # Hard link +src+ to +dest+. If +src+ is a directory, this method links # all its contents recursively. If +dest+ is a directory, links # +src+ to +dest/src+. # # +src+ can be a list of files. # # If +dereference_root+ is true, this method dereference tree root. # # If +remove_destination+ is true, this method removes each destination file before copy. # # FileUtils.rm_r site_ruby + '/mylib', force: true # FileUtils.cp_lr 'lib/', site_ruby + '/mylib' # # # Examples of linking several files to target directory. # FileUtils.cp_lr %w(mail.rb field.rb debug/), site_ruby + '/tmail' # FileUtils.cp_lr Dir.glob('.rb'), '/home/aamine/lib/ruby', noop: true, verbose: true # # # If you want to link all contents of a directory instead of the # # directory itself, c.f. src/x -> dest/x, src/y -> dest/y, # # use the following code. # FileUtils.cp_lr 'src/.', 'dest' # cp_lr('src', 'dest') makes dest/src, but this doesn't. # 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 module_function :cp_lr # # :call-seq: # FileUtils.ln_s(target, link, force: nil, noop: nil, verbose: nil) # FileUtils.ln_s(target, dir, force: nil, noop: nil, verbose: nil) # FileUtils.ln_s(targets, dir, force: nil, noop: nil, verbose: nil) # # In the first form, creates a symbolic link +link+ which points to +target+. # If +link+ already exists, raises Errno::EEXIST. # But if the <tt>force</tt> option is set, overwrites +link+. # # FileUtils.ln_s '/usr/bin/ruby', '/usr/local/bin/ruby' # FileUtils.ln_s 'verylongsourcefilename.c', 'c', force: true # # In the second form, creates a link +dir/target+ pointing to +target+. # In the third form, creates several symbolic links in the directory +dir+, # pointing to each item in +targets+. # If +dir+ is not a directory, raises Errno::ENOTDIR. # # FileUtils.ln_s Dir.glob('/bin/.rb'), '/home/foo/bin' # def ln_s(src, dest, force: nil, noop: nil, verbose: nil) 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 module_function :ln_s alias symlink ln_s module_function :symlink # # :call-seq: # FileUtils.ln_sf(args) # # Same as # # FileUtils.ln_s(args, force: true) # def ln_sf(src, dest, noop: nil, verbose: nil) ln_s src, dest, force: true, noop: noop, verbose: verbose end module_function :ln_sf # # Hard links a file system entry +src+ to +dest+. # If +src+ is a directory, this method links its contents recursively. # # Both of +src+ and +dest+ must be a path name. # +src+ must exist, +dest+ must not exist. # # If +dereference_root+ is true, this method dereferences the tree root. # # If +remove_destination+ is true, this method removes each destination file before copy. # 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 module_function :link_entry # # Copies a file content +src+ to +dest+. If +dest+ is a directory, # copies +src+ to +dest/src+. # # If +src+ is a list of files, then +dest+ must be a directory. # # FileUtils.cp 'eval.c', 'eval.c.org' # FileUtils.cp %w(cgi.rb complex.rb date.rb), '/usr/lib/ruby/1.6' # FileUtils.cp %w(cgi.rb complex.rb date.rb), '/usr/lib/ruby/1.6', verbose: true # FileUtils.cp 'symlink', 'dest' # copy content, "dest" is not a symlink # 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 module_function :cp alias copy cp module_function :copy # # Copies +src+ to +dest+. If +src+ is a directory, this method copies # all its contents recursively. If +dest+ is a directory, copies # +src+ to +dest/src+. # # +src+ can be a list of files. # # If +dereference_root+ is true, this method dereference tree root. # # If +remove_destination+ is true, this method removes each destination file before copy. # # # Installing Ruby library "mylib" under the site_ruby # FileUtils.rm_r site_ruby + '/mylib', force: true # FileUtils.cp_r 'lib/', site_ruby + '/mylib' # # # Examples of copying several files to target directory. # FileUtils.cp_r %w(mail.rb field.rb debug/), site_ruby + '/tmail' # FileUtils.cp_r Dir.glob('.rb'), '/home/foo/lib/ruby', noop: true, verbose: true # # # If you want to copy all contents of a directory instead of the # # directory itself, c.f. src/x -> dest/x, src/y -> dest/y, # # use following code. # FileUtils.cp_r 'src/.', 'dest' # cp_r('src', 'dest') makes dest/src, # # but this doesn't. # 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 module_function :cp_r # # Copies a file system entry +src+ to +dest+. # If +src+ is a directory, this method copies its contents recursively. # This method preserves file types, c.f. symlink, directory... # (FIFO, device files and etc. are not supported yet) # # Both of +src+ and +dest+ must be a path name. # +src+ must exist, +dest+ must not exist. # # If +preserve+ is true, this method preserves owner, group, and # modified time. Permissions are copied regardless +preserve+. # # If +dereference_root+ is true, this method dereference tree root. # # If +remove_destination+ is true, this method removes each destination file before copy. # 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 module_function :copy_entry # # Copies file contents of +src+ to +dest+. # Both of +src+ and +dest+ must be a path name. # 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 module_function :copy_file # # Copies stream +src+ to +dest+. # +src+ must respond to #read(n) and # +dest+ must respond to #write(str). # def copy_stream(src, dest) IO.copy_stream(src, dest) end module_function :copy_stream # # Moves file(s) +src+ to +dest+. If +file+ and +dest+ exist on the different # disk partition, the file is copied then the original file is removed. # # FileUtils.mv 'badname.rb', 'goodname.rb' # FileUtils.mv 'stuff.rb', '/notexist/lib/ruby', force: true # no error # # FileUtils.mv %w(junk.txt dust.txt), '/home/foo/.trash/' # FileUtils.mv Dir.glob('test.rb'), 'test', noop: true, verbose: true # 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 module_function :mv alias move mv module_function :move # # Remove file(s) specified in +list+. This method cannot remove directories. # All StandardErrors are ignored when the :force option is set. # # FileUtils.rm %w( junk.txt dust.txt ) # FileUtils.rm Dir.glob('.so') # FileUtils.rm 'NotExistFile', force: true # never raises exception # 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 module_function :rm alias remove rm module_function :remove # # Equivalent to # # FileUtils.rm(list, force: true) # def rm_f(list, noop: nil, verbose: nil) rm list, force: true, noop: noop, verbose: verbose end module_function :rm_f alias safe_unlink rm_f module_function :safe_unlink # # remove files +list+[0] +list+[1]... If +list+[n] is a directory, # removes its all contents recursively. This method ignores # StandardError when :force option is set. # # FileUtils.rm_r Dir.glob('/tmp/') # FileUtils.rm_r 'some_dir', force: true # # WARNING: This method causes local vulnerability # if one of parent directories or removing directory tree are world # writable (including /tmp, whose permission is 1777), and the current # process has strong privilege such as Unix super user (root), and the # system has symbolic link. For secure removing, read the documentation # of remove_entry_secure carefully, and set :secure option to true. # Default is <tt>secure: false</tt>. # # NOTE: This method calls remove_entry_secure if :secure option is set. # See also remove_entry_secure. # 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 module_function :rm_r # # Equivalent to # # FileUtils.rm_r(list, force: true) # # WARNING: This method causes local vulnerability. # Read the documentation of rm_r first. # def rm_rf(list, noop: nil, verbose: nil, secure: nil) rm_r list, force: true, noop: noop, verbose: verbose, secure: secure end module_function :rm_rf alias rmtree rm_rf module_function :rmtree # # This method removes a file system entry +path+. +path+ shall be a # regular file, a directory, or something. If +path+ is a directory, # remove it recursively. This method is required to avoid TOCTTOU # (time-of-check-to-time-of-use) local security vulnerability of rm_r. # #rm_r causes security hole when: # # * Parent directory is world writable (including /tmp). # * Removing directory tree includes world writable directory. # * The system has symbolic link. # # To avoid this security hole, this method applies special preprocess. # If +path+ is a directory, this method chown(2) and chmod(2) all # removing directories. This requires the current process is the # owner of the removing whole directory tree, or is the super user (root). # # WARNING: You must ensure that ALL parent directories cannot be # moved by other untrusted users. For example, parent directories # should not be owned by untrusted users, and should not be world # writable except when the sticky bit set. # # WARNING: Only the owner of the removing directory tree, or Unix super # user (root) should invoke this method. Otherwise this method does not # work. # # For details of this security vulnerability, see Perl's case: # # * https://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0448 # * https://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0452 # # For fileutils.rb, this vulnerability is reported in [ruby-dev:26100]. # 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 module_function :remove_entry_secure def fu_have_symlink? #:nodoc: File.symlink nil, nil rescue NotImplementedError return false rescue TypeError return true end private_module_function :fu_have_symlink? def fu_stat_identical_entry?(a, b) #:nodoc: a.dev == b.dev and a.ino == b.ino end private_module_function :fu_stat_identical_entry? # # This method removes a file system entry +path+. # +path+ might be a regular file, a directory, or something. # If +path+ is a directory, remove it recursively. # # See also remove_entry_secure. # 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 module_function :remove_entry # # Removes a file +path+. # This method ignores StandardError if +force+ is true. # def remove_file(path, force = false) Entry_.new(path).remove_file rescue raise unless force end module_function :remove_file # # Removes a directory +dir+ and its contents recursively. # This method ignores StandardError if +force+ is true. # def remove_dir(path, force = false) remove_entry path, force # FIXME?? check if it is a directory end module_function :remove_dir # # Returns true if the contents of a file +a+ and a file +b+ are identical. # # FileUtils.compare_file('somefile', 'somefile') #=> true # FileUtils.compare_file('/dev/null', '/dev/urandom') #=> false # 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 module_function :compare_file alias identical? compare_file alias cmp compare_file module_function :identical? module_function :cmp # # Returns true if the contents of a stream +a+ and +b+ are identical. # 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 module_function :compare_stream # # If +src+ is not same as +dest+, copies it and changes the permission # mode to +mode+. If +dest+ is a directory, destination is +dest+/+src+. # This method removes destination before copy. # # FileUtils.install 'ruby', '/usr/local/bin/ruby', mode: 0755, verbose: true # FileUtils.install 'lib.rb', '/usr/local/lib/ruby/site_ruby', verbose: true # 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 copy_file s, d 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 module_function :install def user_mask(target) #:nodoc: target.each_char.inject(0) do \|mask, chr\| case chr when "u" mask \| 04700 when "g" mask \| 02070 when "o" mask \| 01007 when "a" mask \| 07777 else raise ArgumentError, "invalid `who' symbol in file mode: #{chr}" end end end private_module_function :user_mask def apply_mask(mode, user_mask, op, mode_mask) #:nodoc: case op when '=' (mode & ~user_mask) \| (user_mask & mode_mask) when '+' mode \| (user_mask & mode_mask) when '-' mode & ~(user_mask & mode_mask) end end private_module_function :apply_mask def symbolic_modes_to_i(mode_sym, path) #:nodoc: path = File.stat(path) unless File::Stat === path mode = path.mode mode_sym.split(/,/).inject(mode & 07777) do \|current_mode, clause\| target, actions = clause.split(/([=+-])/) raise ArgumentError, "invalid file mode: #{mode_sym}" if actions.empty? target = 'a' if target.empty? user_mask = user_mask(target) actions.each_slice(2) do \|op, perm\| need_apply = op == '=' mode_mask = (perm \|\| '').each_char.inject(0) do \|mask, chr\| case chr when "r" mask \| 0444 when "w" mask \| 0222 when "x" mask \| 0111 when "X" if path.directory? mask \| 0111 else mask end when "s" mask \| 06000 when "t" mask \| 01000 when "u", "g", "o" if mask.nonzero? current_mode = apply_mask(current_mode, user_mask, op, mask) end need_apply = false copy_mask = user_mask(chr) (current_mode & copy_mask) / (copy_mask & 0111) (user_mask & 0111) else raise ArgumentError, "invalid `perm' symbol in file mode: #{chr}" end end if mode_mask.nonzero? \|\| need_apply current_mode = apply_mask(current_mode, user_mask, op, mode_mask) end end current_mode end end private_module_function :symbolic_modes_to_i def fu_mode(mode, path) #:nodoc: mode.is_a?(String) ? symbolic_modes_to_i(mode, path) : mode end private_module_function :fu_mode def mode_to_s(mode) #:nodoc: mode.is_a?(String) ? mode : "%o" % mode end private_module_function :mode_to_s # # Changes permission bits on the named files (in +list+) to the bit pattern # represented by +mode+. # # +mode+ is the symbolic and absolute mode can be used. # # Absolute mode is # FileUtils.chmod 0755, 'somecommand' # FileUtils.chmod 0644, %w(my.rb your.rb his.rb her.rb) # FileUtils.chmod 0755, '/usr/bin/ruby', verbose: true # # Symbolic mode is # FileUtils.chmod "u=wrx,go=rx", 'somecommand' # FileUtils.chmod "u=wr,go=rr", %w(my.rb your.rb his.rb her.rb) # FileUtils.chmod "u=wrx,go=rx", '/usr/bin/ruby', verbose: true # # "a" :: is user, group, other mask. # "u" :: is user's mask. # "g" :: is group's mask. # "o" :: is other's mask. # "w" :: is write permission. # "r" :: is read permission. # "x" :: is execute permission. # "X" :: # is execute permission for directories only, must be used in conjunction with "+" # "s" :: is uid, gid. # "t" :: is sticky bit. # "+" :: is added to a class given the specified mode. # "-" :: Is removed from a given class given mode. # "=" :: Is the exact nature of the class will be given a specified mode. 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 module_function :chmod # # Changes permission bits on the named files (in +list+) # to the bit pattern represented by +mode+. # # FileUtils.chmod_R 0700, "/tmp/app.#{$$}" # FileUtils.chmod_R "u=wrx", "/tmp/app.#{$$}" # 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 module_function :chmod_R # # Changes owner and group on the named files (in +list+) # to the user +user+ and the group +group+. +user+ and +group+ # may be an ID (Integer/String) or a name (String). # If +user+ or +group+ is nil, this method does not change # the attribute. # # FileUtils.chown 'root', 'staff', '/usr/local/bin/ruby' # FileUtils.chown nil, 'bin', Dir.glob('/usr/bin/'), verbose: true # 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 module_function :chown # # Changes owner and group on the named files (in +list+) # to the user +user+ and the group +group+ recursively. # +user+ and +group+ may be an ID (Integer/String) or # a name (String). If +user+ or +group+ is nil, this # method does not change the attribute. # # FileUtils.chown_R 'www', 'www', '/var/www/htdocs' # FileUtils.chown_R 'cvs', 'cvs', '/var/cvs', verbose: true # 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 module_function :chown_R def fu_get_uid(user) #:nodoc: return nil unless user case user when Integer user when /\A\d+\z/ user.to_i else require 'etc' Etc.getpwnam(user) ? Etc.getpwnam(user).uid : nil end end private_module_function :fu_get_uid def fu_get_gid(group) #:nodoc: return nil unless group case group when Integer group when /\A\d+\z/ group.to_i else require 'etc' Etc.getgrnam(group) ? Etc.getgrnam(group).gid : nil end end private_module_function :fu_get_gid # # Updates modification time (mtime) and access time (atime) of file(s) in # +list+. Files are created if they don't exist. # # FileUtils.touch 'timestamp' # FileUtils.touch Dir.glob('.c'); system 'make' # 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 module_function :touch private module StreamUtils_ private case (defined?(::RbConfig) ? ::RbConfig::CONFIG['host_os'] : ::RUBY_PLATFORM) when /mswin\|mingw/ def fu_windows?; true end else def fu_windows?; false end end def fu_copy_stream0(src, dest, blksize = nil) #:nodoc: IO.copy_stream(src, dest) end def fu_stream_blksize(streams) streams.each do \|s\| next unless s.respond_to?(:stat) size = fu_blksize(s.stat) return size if size end fu_default_blksize() end def fu_blksize(st) s = st.blksize return nil unless s return nil if s == 0 s end def fu_default_blksize 1024 end end include StreamUtils_ extend StreamUtils_ class Entry_ #:nodoc: internal use only include StreamUtils_ def initialize(a, b = nil, deref = false) @prefix = @rel = @path = nil if b @prefix = a @rel = b else @path = a end @deref = deref @stat = nil @lstat = nil end def inspect "\#<#{self.class} #{path()}>" end def path if @path File.path(@path) else join(@prefix, @rel) end end def prefix @prefix \|\| @path end def rel @rel end def dereference? @deref end def exist? begin lstat true rescue Errno::ENOENT false end end def file? s = lstat! s and s.file? end def directory? s = lstat! s and s.directory? end def symlink? s = lstat! s and s.symlink? end def chardev? s = lstat! s and s.chardev? end def blockdev? s = lstat! s and s.blockdev? end def socket? s = lstat! s and s.socket? end def pipe? s = lstat! s and s.pipe? end S_IF_DOOR = 0xD000 def door? s = lstat! s and (s.mode & 0xF000 == S_IF_DOOR) end def entries opts = {} opts[:encoding] = fu_windows? ? ::Encoding::UTF_8 : path.encoding files = Dir.children(path, opts) untaint = RUBY_VERSION < '2.7' files.map {\|n\| Entry_.new(prefix(), join(rel(), untaint ? n.untaint : n)) } end def stat return @stat if @stat if lstat() and lstat().symlink? @stat = File.stat(path()) else @stat = lstat() end @stat end def stat! return @stat if @stat if lstat! and lstat!.symlink? @stat = File.stat(path()) else @stat = lstat! end @stat rescue SystemCallError nil end def lstat if dereference? @lstat \|\|= File.stat(path()) else @lstat \|\|= File.lstat(path()) end end def lstat! lstat() rescue SystemCallError nil end def chmod(mode) if symlink? File.lchmod mode, path() if have_lchmod? else File.chmod mode, path() end rescue Errno::EOPNOTSUPP end def chown(uid, gid) if symlink? File.lchown uid, gid, path() if have_lchown? else File.chown uid, gid, path() end end def link(dest) case when directory? if !File.exist?(dest) and descendant_directory?(dest, path) raise ArgumentError, "cannot link directory %s to itself %s" % [path, dest] end begin Dir.mkdir dest rescue raise unless File.directory?(dest) end else File.link path(), dest end end def copy(dest) lstat case when file? copy_file dest when directory? if !File.exist?(dest) and descendant_directory?(dest, path) raise ArgumentError, "cannot copy directory %s to itself %s" % [path, dest] end begin Dir.mkdir dest rescue raise unless File.directory?(dest) end when symlink? File.symlink File.readlink(path()), dest when chardev?, blockdev? raise "cannot handle device file" when socket? begin require 'socket' rescue LoadError raise "cannot handle socket" else raise "cannot handle socket" unless defined?(UNIXServer) end UNIXServer.new(dest).close File.chmod lstat().mode, dest when pipe? raise "cannot handle FIFO" unless File.respond_to?(:mkfifo) File.mkfifo dest, lstat().mode when door? raise "cannot handle door: #{path()}" else raise "unknown file type: #{path()}" end end def copy_file(dest) File.open(path()) do \|s\| File.open(dest, 'wb', s.stat.mode) do \|f\| IO.copy_stream(s, f) end end end def copy_metadata(path) st = lstat() if !st.symlink? File.utime st.atime, st.mtime, path end mode = st.mode begin if st.symlink? begin File.lchown st.uid, st.gid, path rescue NotImplementedError end else File.chown st.uid, st.gid, path end rescue Errno::EPERM, Errno::EACCES # clear setuid/setgid mode &= 01777 end if st.symlink? begin File.lchmod mode, path rescue NotImplementedError, Errno::EOPNOTSUPP end else File.chmod mode, path end end def remove if directory? remove_dir1 else remove_file end end def remove_dir1 platform_support { Dir.rmdir path().chomp(?/) } end def remove_file platform_support { File.unlink path } end def platform_support return yield unless fu_windows? first_time_p = true begin yield rescue Errno::ENOENT raise rescue => err if first_time_p first_time_p = false begin File.chmod 0700, path() # Windows does not have symlink retry rescue SystemCallError end end raise err end end def preorder_traverse stack = [self] while ent = stack.pop yield ent stack.concat ent.entries.reverse if ent.directory? end end alias traverse preorder_traverse def postorder_traverse if directory? entries().each do \|ent\| ent.postorder_traverse do \|e\| yield e end end end ensure yield self end def wrap_traverse(pre, post) pre.call self if directory? entries.each do \|ent\| ent.wrap_traverse pre, post end end post.call self end private @@fileutils_rb_have_lchmod = nil def have_lchmod? # This is not MT-safe, but it does not matter. if @@fileutils_rb_have_lchmod == nil @@fileutils_rb_have_lchmod = check_have_lchmod? end @@fileutils_rb_have_lchmod end def check_have_lchmod? return false unless File.respond_to?(:lchmod) File.lchmod 0 return true rescue NotImplementedError return false end @@fileutils_rb_have_lchown = nil def have_lchown? # This is not MT-safe, but it does not matter. if @@fileutils_rb_have_lchown == nil @@fileutils_rb_have_lchown = check_have_lchown? end @@fileutils_rb_have_lchown end def check_have_lchown? return false unless File.respond_to?(:lchown) File.lchown nil, nil return true rescue NotImplementedError return false end def join(dir, base) return File.path(dir) if not base or base == '.' return File.path(base) if not dir or dir == '.' begin File.join(dir, base) rescue EncodingError if fu_windows? File.join(dir.encode(::Encoding::UTF_8), base.encode(::Encoding::UTF_8)) else raise end end end if File::ALT_SEPARATOR DIRECTORY_TERM = "(?=[/#{Regexp.quote(File::ALT_SEPARATOR)}]\|\\z)" else DIRECTORY_TERM = "(?=/\|\\z)" end def descendant_directory?(descendant, ascendant) if File::FNM_SYSCASE.nonzero? File.expand_path(File.dirname(descendant)).casecmp(File.expand_path(ascendant)) == 0 else File.expand_path(File.dirname(descendant)) == File.expand_path(ascendant) end end end # class Entry_ def fu_list(arg) #:nodoc: [arg].flatten.map {\|path\| File.path(path) } end private_module_function :fu_list def fu_each_src_dest(src, dest) #:nodoc: fu_each_src_dest0(src, dest) do \|s, d\| raise ArgumentError, "same file: #{s} and #{d}" if fu_same?(s, d) yield s, d end end private_module_function :fu_each_src_dest def fu_each_src_dest0(src, dest) #:nodoc: if tmp = Array.try_convert(src) tmp.each do \|s\| s = File.path(s) yield s, File.join(dest, File.basename(s)) end else src = File.path(src) if File.directory?(dest) yield src, File.join(dest, File.basename(src)) else yield src, File.path(dest) end end end private_module_function :fu_each_src_dest0 def fu_same?(a, b) #:nodoc: File.identical?(a, b) end private_module_function :fu_same? def fu_output_message(msg) #:nodoc: output = @fileutils_output if defined?(@fileutils_output) output \|\|= $stdout if defined?(@fileutils_label) msg = @fileutils_label + msg end output.puts msg end private_module_function :fu_output_message # This hash table holds command options. OPT_TABLE = {} #:nodoc: internal use only (private_instance_methods & methods(false)).inject(OPT_TABLE) {\|tbl, name\| (tbl[name.to_s] = instance_method(name).parameters).map! {\|t, n\| n if t == :key}.compact! tbl } public # # Returns an Array of names of high-level methods that accept any keyword # arguments. # # p FileUtils.commands #=> ["chmod", "cp", "cp_r", "install", ...] # def self.commands OPT_TABLE.keys end # # Returns an Array of option names. # # p FileUtils.options #=> ["noop", "force", "verbose", "preserve", "mode"] # def self.options OPT_TABLE.values.flatten.uniq.map {\|sym\| sym.to_s } end # # Returns true if the method +mid+ have an option +opt+. # # p FileUtils.have_option?(:cp, :noop) #=> true # p FileUtils.have_option?(:rm, :force) #=> true # p FileUtils.have_option?(:rm, :preserve) #=> false # def self.have_option?(mid, opt) li = OPT_TABLE[mid.to_s] or raise ArgumentError, "no such method: #{mid}" li.include?(opt) end # # Returns an Array of option names of the method +mid+. # # p FileUtils.options_of(:rm) #=> ["noop", "verbose", "force"] # def self.options_of(mid) OPT_TABLE[mid.to_s].map {\|sym\| sym.to_s } end # # Returns an Array of methods names which have the option +opt+. # # p FileUtils.collect_method(:preserve) #=> ["cp", "cp_r", "copy", "install"] # def self.collect_method(opt) OPT_TABLE.keys.select {\|m\| OPT_TABLE[m].include?(opt) } end private LOW_METHODS = singleton_methods(false) - collect_method(:noop).map(&:intern) # :nodoc: module LowMethods # :nodoc: internal use only private def _do_nothing()end ::FileUtils::LOW_METHODS.map {\|name\| alias_method name, :_do_nothing} end METHODS = singleton_methods() - [:private_module_function, # :nodoc: :commands, :options, :have_option?, :options_of, :collect_method] # # This module has all methods of FileUtils module, but it outputs messages # before acting. This equates to passing the <tt>:verbose</tt> flag to # methods in FileUtils. # module Verbose include FileUtils names = ::FileUtils.collect_method(:verbose) names.each do \|name\| module_eval(<<-EOS, __FILE__, __LINE__ + 1) def #{name}(args, options) super(args, *options, verbose: true) end EOS end private(names) extend self class << self public(::FileUtils::METHODS) end end # # This module has all methods of FileUtils module, but never changes # files/directories. This equates to passing the <tt>:noop</tt> flag # to methods in FileUtils. # module NoWrite include FileUtils include LowMethods names = ::FileUtils.collect_method(:noop) names.each do \|name\| module_eval(<<-EOS, __FILE__, __LINE__ + 1) def #{name}(args, *options) super(args, *options, noop: true) end EOS end private(names) extend self class << self public(::FileUtils::METHODS) end end # # This module has all methods of FileUtils module, but never changes # files/directories, with printing message before acting. # This equates to passing the <tt>:noop</tt> and <tt>:verbose</tt> flag # to methods in FileUtils. # module DryRun include FileUtils include LowMethods names = ::FileUtils.collect_method(:noop) names.each do \|name\| module_eval(<<-EOS, __FILE__, __LINE__ + 1) def #{name}(args, *options) super(args, *options, noop: true, verbose: true) end EOS end private(names) extend self class << self public(*::FileUtils::METHODS) end end end Back

Edit File : fileutils.rb | Size : 47.74 KB

# frozen_string_literal: true

begin
  require 'rbconfig'
rescue LoadError
  # for make mjit-headers
end

#
# = fileutils.rb
#
# Copyright (c) 2000-2007 Minero Aoki
#
# This program is free software.
# You can distribute/modify this program under the same terms of ruby.
#
# == module FileUtils
#
# Namespace for several file utility methods for copying, moving, removing, etc.
#
# === Module Functions
#
#   require 'fileutils'
#
#   FileUtils.cd(dir, **options)
#   FileUtils.cd(dir, **options) {|dir| block }
#   FileUtils.pwd()
#   FileUtils.mkdir(dir, **options)
#   FileUtils.mkdir(list, **options)
#   FileUtils.mkdir_p(dir, **options)
#   FileUtils.mkdir_p(list, **options)
#   FileUtils.rmdir(dir, **options)
#   FileUtils.rmdir(list, **options)
#   FileUtils.ln(target, link, **options)
#   FileUtils.ln(targets, dir, **options)
#   FileUtils.ln_s(target, link, **options)
#   FileUtils.ln_s(targets, dir, **options)
#   FileUtils.ln_sf(target, link, **options)
#   FileUtils.cp(src, dest, **options)
#   FileUtils.cp(list, dir, **options)
#   FileUtils.cp_r(src, dest, **options)
#   FileUtils.cp_r(list, dir, **options)
#   FileUtils.mv(src, dest, **options)
#   FileUtils.mv(list, dir, **options)
#   FileUtils.rm(list, **options)
#   FileUtils.rm_r(list, **options)
#   FileUtils.rm_rf(list, **options)
#   FileUtils.install(src, dest, **options)
#   FileUtils.chmod(mode, list, **options)
#   FileUtils.chmod_R(mode, list, **options)
#   FileUtils.chown(user, group, list, **options)
#   FileUtils.chown_R(user, group, list, **options)
#   FileUtils.touch(list, **options)
#
# Possible <tt>options</tt> are:
#
# <tt>:force</tt> :: forced operation (rewrite files if exist, remove
#                    directories if not empty, etc.);
# <tt>:verbose</tt> :: print command to be run, in bash syntax, before
#                      performing it;
# <tt>:preserve</tt> :: preserve object's group, user and modification
#                       time on copying;
# <tt>:noop</tt> :: no changes are made (usable in combination with
#                   <tt>:verbose</tt> which will print the command to run)
#
# Each method documents the options that it honours. See also ::commands,
# ::options and ::options_of methods to introspect which command have which
# options.
#
# All methods that have the concept of a "source" file or directory can take
# either one file or a list of files in that argument.  See the method
# documentation for examples.
#
# There are some `low level' methods, which do not accept keyword arguments:
#
#   FileUtils.copy_entry(src, dest, preserve = false, dereference_root = false, remove_destination = false)
#   FileUtils.copy_file(src, dest, preserve = false, dereference = true)
#   FileUtils.copy_stream(srcstream, deststream)
#   FileUtils.remove_entry(path, force = false)
#   FileUtils.remove_entry_secure(path, force = false)
#   FileUtils.remove_file(path, force = false)
#   FileUtils.compare_file(path_a, path_b)
#   FileUtils.compare_stream(stream_a, stream_b)
#   FileUtils.uptodate?(file, cmp_list)
#
# == module FileUtils::Verbose
#
# This module has all methods of FileUtils module, but it outputs messages
# before acting.  This equates to passing the <tt>:verbose</tt> flag to methods
# in FileUtils.
#
# == module FileUtils::NoWrite
#
# This module has all methods of FileUtils module, but never changes
# files/directories.  This equates to passing the <tt>:noop</tt> flag to methods
# in FileUtils.
#
# == module FileUtils::DryRun
#
# This module has all methods of FileUtils module, but never changes
# files/directories.  This equates to passing the <tt>:noop</tt> and
# <tt>:verbose</tt> flags to methods in FileUtils.
#
module FileUtils
  VERSION = "1.6.0"

def self.private_module_function(name)   #:nodoc:
    module_function name
    private_class_method name
  end

#
  # Returns the name of the current directory.
  #
  def pwd
    Dir.pwd
  end
  module_function :pwd

alias getwd pwd
  module_function :getwd

#
  # Changes the current directory to the directory +dir+.
  #
  # If this method is called with block, resumes to the previous
  # working directory after the block execution has finished.
  #
  #   FileUtils.cd('/')  # change directory
  #
  #   FileUtils.cd('/', verbose: true)   # change directory and report it
  #
  #   FileUtils.cd('/') do  # change directory
  #     # ...               # do something
  #   end                   # return to original directory
  #
  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
  module_function :cd

alias chdir cd
  module_function :chdir

#
  # Returns true if +new+ is newer than all +old_list+.
  # Non-existent files are older than any file.
  #
  #   FileUtils.uptodate?('hello.o', %w(hello.c hello.h)) or \
  #       system 'make hello.o'
  #
  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
  module_function :uptodate?

def remove_trailing_slash(dir)   #:nodoc:
    dir == '/' ? dir : dir.chomp(?/)
  end
  private_module_function :remove_trailing_slash

#
  # Creates one or more directories.
  #
  #   FileUtils.mkdir 'test'
  #   FileUtils.mkdir %w(tmp data)
  #   FileUtils.mkdir 'notexist', noop: true  # Does not really create.
  #   FileUtils.mkdir 'tmp', mode: 0700
  #
  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
  module_function :mkdir

#
  # Creates a directory and all its parent directories.
  # For example,
  #
  #   FileUtils.mkdir_p '/usr/local/lib/ruby'
  #
  # causes to make following directories, if they do not exist.
  #
  # * /usr
  # * /usr/local
  # * /usr/local/lib
  # * /usr/local/lib/ruby
  #
  # You can pass several directories at a time in a list.
  #
  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
  module_function :mkdir_p

alias mkpath    mkdir_p
  alias makedirs  mkdir_p
  module_function :mkpath
  module_function :makedirs

def fu_mkdir(path, mode)   #:nodoc:
    path = remove_trailing_slash(path)
    if mode
      Dir.mkdir path, mode
      File.chmod mode, path
    else
      Dir.mkdir path
    end
  end
  private_module_function :fu_mkdir

#
  # Removes one or more directories.
  #
  #   FileUtils.rmdir 'somedir'
  #   FileUtils.rmdir %w(somedir anydir otherdir)
  #   # Does not really remove directory; outputs message.
  #   FileUtils.rmdir 'somedir', verbose: true, noop: true
  #
  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
  module_function :rmdir

#
  # :call-seq:
  #   FileUtils.ln(target, link, force: nil, noop: nil, verbose: nil)
  #   FileUtils.ln(target,  dir, force: nil, noop: nil, verbose: nil)
  #   FileUtils.ln(targets, dir, force: nil, noop: nil, verbose: nil)
  #
  # In the first form, creates a hard link +link+ which points to +target+.
  # If +link+ already exists, raises Errno::EEXIST.
  # But if the +force+ option is set, overwrites +link+.
  #
  #   FileUtils.ln 'gcc', 'cc', verbose: true
  #   FileUtils.ln '/usr/bin/emacs21', '/usr/bin/emacs'
  #
  # In the second form, creates a link +dir/target+ pointing to +target+.
  # In the third form, creates several hard links in the directory +dir+,
  # pointing to each item in +targets+.
  # If +dir+ is not a directory, raises Errno::ENOTDIR.
  #
  #   FileUtils.cd '/sbin'
  #   FileUtils.ln %w(cp mv mkdir), '/bin'   # Now /sbin/cp and /bin/cp are linked.
  #
  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
  module_function :ln

alias link ln
  module_function :link

#
  # Hard link +src+ to +dest+. If +src+ is a directory, this method links
  # all its contents recursively. If +dest+ is a directory, links
  # +src+ to +dest/src+.
  #
  # +src+ can be a list of files.
  #
  # If +dereference_root+ is true, this method dereference tree root.
  #
  # If +remove_destination+ is true, this method removes each destination file before copy.
  #
  #   FileUtils.rm_r site_ruby + '/mylib', force: true
  #   FileUtils.cp_lr 'lib/', site_ruby + '/mylib'
  #
  #   # Examples of linking several files to target directory.
  #   FileUtils.cp_lr %w(mail.rb field.rb debug/), site_ruby + '/tmail'
  #   FileUtils.cp_lr Dir.glob('*.rb'), '/home/aamine/lib/ruby', noop: true, verbose: true
  #
  #   # If you want to link all contents of a directory instead of the
  #   # directory itself, c.f. src/x -> dest/x, src/y -> dest/y,
  #   # use the following code.
  #   FileUtils.cp_lr 'src/.', 'dest'  # cp_lr('src', 'dest') makes dest/src, but this doesn't.
  #
  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
  module_function :cp_lr

#
  # :call-seq:
  #   FileUtils.ln_s(target, link, force: nil, noop: nil, verbose: nil)
  #   FileUtils.ln_s(target,  dir, force: nil, noop: nil, verbose: nil)
  #   FileUtils.ln_s(targets, dir, force: nil, noop: nil, verbose: nil)
  #
  # In the first form, creates a symbolic link +link+ which points to +target+.
  # If +link+ already exists, raises Errno::EEXIST.
  # But if the <tt>force</tt> option is set, overwrites +link+.
  #
  #   FileUtils.ln_s '/usr/bin/ruby', '/usr/local/bin/ruby'
  #   FileUtils.ln_s 'verylongsourcefilename.c', 'c', force: true
  #
  # In the second form, creates a link +dir/target+ pointing to +target+.
  # In the third form, creates several symbolic links in the directory +dir+,
  # pointing to each item in +targets+.
  # If +dir+ is not a directory, raises Errno::ENOTDIR.
  #
  #   FileUtils.ln_s Dir.glob('/bin/*.rb'), '/home/foo/bin'
  #
  def ln_s(src, dest, force: nil, noop: nil, verbose: nil)
    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
  module_function :ln_s

alias symlink ln_s
  module_function :symlink

#
  # :call-seq:
  #   FileUtils.ln_sf(*args)
  #
  # Same as
  #
  #   FileUtils.ln_s(*args, force: true)
  #
  def ln_sf(src, dest, noop: nil, verbose: nil)
    ln_s src, dest, force: true, noop: noop, verbose: verbose
  end
  module_function :ln_sf

#
  # Hard links a file system entry +src+ to +dest+.
  # If +src+ is a directory, this method links its contents recursively.
  #
  # Both of +src+ and +dest+ must be a path name.
  # +src+ must exist, +dest+ must not exist.
  #
  # If +dereference_root+ is true, this method dereferences the tree root.
  #
  # If +remove_destination+ is true, this method removes each destination file before copy.
  #
  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
  module_function :link_entry

#
  # Copies a file content +src+ to +dest+.  If +dest+ is a directory,
  # copies +src+ to +dest/src+.
  #
  # If +src+ is a list of files, then +dest+ must be a directory.
  #
  #   FileUtils.cp 'eval.c', 'eval.c.org'
  #   FileUtils.cp %w(cgi.rb complex.rb date.rb), '/usr/lib/ruby/1.6'
  #   FileUtils.cp %w(cgi.rb complex.rb date.rb), '/usr/lib/ruby/1.6', verbose: true
  #   FileUtils.cp 'symlink', 'dest'   # copy content, "dest" is not a symlink
  #
  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
  module_function :cp

alias copy cp
  module_function :copy

#
  # Copies +src+ to +dest+. If +src+ is a directory, this method copies
  # all its contents recursively. If +dest+ is a directory, copies
  # +src+ to +dest/src+.
  #
  # +src+ can be a list of files.
  #
  # If +dereference_root+ is true, this method dereference tree root.
  #
  # If +remove_destination+ is true, this method removes each destination file before copy.
  #
  #   # Installing Ruby library "mylib" under the site_ruby
  #   FileUtils.rm_r site_ruby + '/mylib', force: true
  #   FileUtils.cp_r 'lib/', site_ruby + '/mylib'
  #
  #   # Examples of copying several files to target directory.
  #   FileUtils.cp_r %w(mail.rb field.rb debug/), site_ruby + '/tmail'
  #   FileUtils.cp_r Dir.glob('*.rb'), '/home/foo/lib/ruby', noop: true, verbose: true
  #
  #   # If you want to copy all contents of a directory instead of the
  #   # directory itself, c.f. src/x -> dest/x, src/y -> dest/y,
  #   # use following code.
  #   FileUtils.cp_r 'src/.', 'dest'     # cp_r('src', 'dest') makes dest/src,
  #                                      # but this doesn't.
  #
  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
  module_function :cp_r

#
  # Copies a file system entry +src+ to +dest+.
  # If +src+ is a directory, this method copies its contents recursively.
  # This method preserves file types, c.f. symlink, directory...
  # (FIFO, device files and etc. are not supported yet)
  #
  # Both of +src+ and +dest+ must be a path name.
  # +src+ must exist, +dest+ must not exist.
  #
  # If +preserve+ is true, this method preserves owner, group, and
  # modified time.  Permissions are copied regardless +preserve+.
  #
  # If +dereference_root+ is true, this method dereference tree root.
  #
  # If +remove_destination+ is true, this method removes each destination file before copy.
  #
  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
  module_function :copy_entry

#
  # Copies file contents of +src+ to +dest+.
  # Both of +src+ and +dest+ must be a path name.
  #
  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
  module_function :copy_file

#
  # Copies stream +src+ to +dest+.
  # +src+ must respond to #read(n) and
  # +dest+ must respond to #write(str).
  #
  def copy_stream(src, dest)
    IO.copy_stream(src, dest)
  end
  module_function :copy_stream

#
  # Moves file(s) +src+ to +dest+.  If +file+ and +dest+ exist on the different
  # disk partition, the file is copied then the original file is removed.
  #
  #   FileUtils.mv 'badname.rb', 'goodname.rb'
  #   FileUtils.mv 'stuff.rb', '/notexist/lib/ruby', force: true  # no error
  #
  #   FileUtils.mv %w(junk.txt dust.txt), '/home/foo/.trash/'
  #   FileUtils.mv Dir.glob('test*.rb'), 'test', noop: true, verbose: true
  #
  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
  module_function :mv

alias move mv
  module_function :move

#
  # Remove file(s) specified in +list+.  This method cannot remove directories.
  # All StandardErrors are ignored when the :force option is set.
  #
  #   FileUtils.rm %w( junk.txt dust.txt )
  #   FileUtils.rm Dir.glob('*.so')
  #   FileUtils.rm 'NotExistFile', force: true   # never raises exception
  #
  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
  module_function :rm

alias remove rm
  module_function :remove

#
  # Equivalent to
  #
  #   FileUtils.rm(list, force: true)
  #
  def rm_f(list, noop: nil, verbose: nil)
    rm list, force: true, noop: noop, verbose: verbose
  end
  module_function :rm_f

alias safe_unlink rm_f
  module_function :safe_unlink

#
  # remove files +list+[0] +list+[1]... If +list+[n] is a directory,
  # removes its all contents recursively. This method ignores
  # StandardError when :force option is set.
  #
  #   FileUtils.rm_r Dir.glob('/tmp/*')
  #   FileUtils.rm_r 'some_dir', force: true
  #
  # WARNING: This method causes local vulnerability
  # if one of parent directories or removing directory tree are world
  # writable (including /tmp, whose permission is 1777), and the current
  # process has strong privilege such as Unix super user (root), and the
  # system has symbolic link.  For secure removing, read the documentation
  # of remove_entry_secure carefully, and set :secure option to true.
  # Default is <tt>secure: false</tt>.
  #
  # NOTE: This method calls remove_entry_secure if :secure option is set.
  # See also remove_entry_secure.
  #
  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
  module_function :rm_r

#
  # Equivalent to
  #
  #   FileUtils.rm_r(list, force: true)
  #
  # WARNING: This method causes local vulnerability.
  # Read the documentation of rm_r first.
  #
  def rm_rf(list, noop: nil, verbose: nil, secure: nil)
    rm_r list, force: true, noop: noop, verbose: verbose, secure: secure
  end
  module_function :rm_rf

alias rmtree rm_rf
  module_function :rmtree

#
  # This method removes a file system entry +path+.  +path+ shall be a
  # regular file, a directory, or something.  If +path+ is a directory,
  # remove it recursively.  This method is required to avoid TOCTTOU
  # (time-of-check-to-time-of-use) local security vulnerability of rm_r.
  # #rm_r causes security hole when:
  #
  # * Parent directory is world writable (including /tmp).
  # * Removing directory tree includes world writable directory.
  # * The system has symbolic link.
  #
  # To avoid this security hole, this method applies special preprocess.
  # If +path+ is a directory, this method chown(2) and chmod(2) all
  # removing directories.  This requires the current process is the
  # owner of the removing whole directory tree, or is the super user (root).
  #
  # WARNING: You must ensure that *ALL* parent directories cannot be
  # moved by other untrusted users.  For example, parent directories
  # should not be owned by untrusted users, and should not be world
  # writable except when the sticky bit set.
  #
  # WARNING: Only the owner of the removing directory tree, or Unix super
  # user (root) should invoke this method.  Otherwise this method does not
  # work.
  #
  # For details of this security vulnerability, see Perl's case:
  #
  # * https://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0448
  # * https://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0452
  #
  # For fileutils.rb, this vulnerability is reported in [ruby-dev:26100].
  #
  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
  module_function :remove_entry_secure

def fu_have_symlink?   #:nodoc:
    File.symlink nil, nil
  rescue NotImplementedError
    return false
  rescue TypeError
    return true
  end
  private_module_function :fu_have_symlink?

def fu_stat_identical_entry?(a, b)   #:nodoc:
    a.dev == b.dev and a.ino == b.ino
  end
  private_module_function :fu_stat_identical_entry?

#
  # This method removes a file system entry +path+.
  # +path+ might be a regular file, a directory, or something.
  # If +path+ is a directory, remove it recursively.
  #
  # See also remove_entry_secure.
  #
  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
  module_function :remove_entry

#
  # Removes a file +path+.
  # This method ignores StandardError if +force+ is true.
  #
  def remove_file(path, force = false)
    Entry_.new(path).remove_file
  rescue
    raise unless force
  end
  module_function :remove_file

#
  # Removes a directory +dir+ and its contents recursively.
  # This method ignores StandardError if +force+ is true.
  #
  def remove_dir(path, force = false)
    remove_entry path, force   # FIXME?? check if it is a directory
  end
  module_function :remove_dir

#
  # Returns true if the contents of a file +a+ and a file +b+ are identical.
  #
  #   FileUtils.compare_file('somefile', 'somefile')       #=> true
  #   FileUtils.compare_file('/dev/null', '/dev/urandom')  #=> false
  #
  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
  module_function :compare_file

alias identical? compare_file
  alias cmp compare_file
  module_function :identical?
  module_function :cmp

#
  # Returns true if the contents of a stream +a+ and +b+ are identical.
  #
  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
  module_function :compare_stream

#
  # If +src+ is not same as +dest+, copies it and changes the permission
  # mode to +mode+.  If +dest+ is a directory, destination is +dest+/+src+.
  # This method removes destination before copy.
  #
  #   FileUtils.install 'ruby', '/usr/local/bin/ruby', mode: 0755, verbose: true
  #   FileUtils.install 'lib.rb', '/usr/local/lib/ruby/site_ruby', verbose: true
  #
  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
        copy_file s, d
        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
  module_function :install

def user_mask(target)  #:nodoc:
    target.each_char.inject(0) do |mask, chr|
      case chr
      when "u"
        mask | 04700
      when "g"
        mask | 02070
      when "o"
        mask | 01007
      when "a"
        mask | 07777
      else
        raise ArgumentError, "invalid `who' symbol in file mode: #{chr}"
      end
    end
  end
  private_module_function :user_mask

def apply_mask(mode, user_mask, op, mode_mask)   #:nodoc:
    case op
    when '='
      (mode & ~user_mask) | (user_mask & mode_mask)
    when '+'
      mode | (user_mask & mode_mask)
    when '-'
      mode & ~(user_mask & mode_mask)
    end
  end
  private_module_function :apply_mask

def symbolic_modes_to_i(mode_sym, path)  #:nodoc:
    path = File.stat(path) unless File::Stat === path
    mode = path.mode
    mode_sym.split(/,/).inject(mode & 07777) do |current_mode, clause|
      target, *actions = clause.split(/([=+-])/)
      raise ArgumentError, "invalid file mode: #{mode_sym}" if actions.empty?
      target = 'a' if target.empty?
      user_mask = user_mask(target)
      actions.each_slice(2) do |op, perm|
        need_apply = op == '='
        mode_mask = (perm || '').each_char.inject(0) do |mask, chr|
          case chr
          when "r"
            mask | 0444
          when "w"
            mask | 0222
          when "x"
            mask | 0111
          when "X"
            if path.directory?
              mask | 0111
            else
              mask
            end
          when "s"
            mask | 06000
          when "t"
            mask | 01000
          when "u", "g", "o"
            if mask.nonzero?
              current_mode = apply_mask(current_mode, user_mask, op, mask)
            end
            need_apply = false
            copy_mask = user_mask(chr)
            (current_mode & copy_mask) / (copy_mask & 0111) * (user_mask & 0111)
          else
            raise ArgumentError, "invalid `perm' symbol in file mode: #{chr}"
          end
        end

if mode_mask.nonzero? || need_apply
          current_mode = apply_mask(current_mode, user_mask, op, mode_mask)
        end
      end
      current_mode
    end
  end
  private_module_function :symbolic_modes_to_i

def fu_mode(mode, path)  #:nodoc:
    mode.is_a?(String) ? symbolic_modes_to_i(mode, path) : mode
  end
  private_module_function :fu_mode

def mode_to_s(mode)  #:nodoc:
    mode.is_a?(String) ? mode : "%o" % mode
  end
  private_module_function :mode_to_s

#
  # Changes permission bits on the named files (in +list+) to the bit pattern
  # represented by +mode+.
  #
  # +mode+ is the symbolic and absolute mode can be used.
  #
  # Absolute mode is
  #   FileUtils.chmod 0755, 'somecommand'
  #   FileUtils.chmod 0644, %w(my.rb your.rb his.rb her.rb)
  #   FileUtils.chmod 0755, '/usr/bin/ruby', verbose: true
  #
  # Symbolic mode is
  #   FileUtils.chmod "u=wrx,go=rx", 'somecommand'
  #   FileUtils.chmod "u=wr,go=rr", %w(my.rb your.rb his.rb her.rb)
  #   FileUtils.chmod "u=wrx,go=rx", '/usr/bin/ruby', verbose: true
  #
  # "a" :: is user, group, other mask.
  # "u" :: is user's mask.
  # "g" :: is group's mask.
  # "o" :: is other's mask.
  # "w" :: is write permission.
  # "r" :: is read permission.
  # "x" :: is execute permission.
  # "X" ::
  #   is execute permission for directories only, must be used in conjunction with "+"
  # "s" :: is uid, gid.
  # "t" :: is sticky bit.
  # "+" :: is added to a class given the specified mode.
  # "-" :: Is removed from a given class given mode.
  # "=" :: Is the exact nature of the class will be given a specified mode.

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
  module_function :chmod

#
  # Changes permission bits on the named files (in +list+)
  # to the bit pattern represented by +mode+.
  #
  #   FileUtils.chmod_R 0700, "/tmp/app.#{$$}"
  #   FileUtils.chmod_R "u=wrx", "/tmp/app.#{$$}"
  #
  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
  module_function :chmod_R

#
  # Changes owner and group on the named files (in +list+)
  # to the user +user+ and the group +group+.  +user+ and +group+
  # may be an ID (Integer/String) or a name (String).
  # If +user+ or +group+ is nil, this method does not change
  # the attribute.
  #
  #   FileUtils.chown 'root', 'staff', '/usr/local/bin/ruby'
  #   FileUtils.chown nil, 'bin', Dir.glob('/usr/bin/*'), verbose: true
  #
  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
  module_function :chown

#
  # Changes owner and group on the named files (in +list+)
  # to the user +user+ and the group +group+ recursively.
  # +user+ and +group+ may be an ID (Integer/String) or
  # a name (String).  If +user+ or +group+ is nil, this
  # method does not change the attribute.
  #
  #   FileUtils.chown_R 'www', 'www', '/var/www/htdocs'
  #   FileUtils.chown_R 'cvs', 'cvs', '/var/cvs', verbose: true
  #
  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
  module_function :chown_R

def fu_get_uid(user)   #:nodoc:
    return nil unless user
    case user
    when Integer
      user
    when /\A\d+\z/
      user.to_i
    else
      require 'etc'
      Etc.getpwnam(user) ? Etc.getpwnam(user).uid : nil
    end
  end
  private_module_function :fu_get_uid

def fu_get_gid(group)   #:nodoc:
    return nil unless group
    case group
    when Integer
      group
    when /\A\d+\z/
      group.to_i
    else
      require 'etc'
      Etc.getgrnam(group) ? Etc.getgrnam(group).gid : nil
    end
  end
  private_module_function :fu_get_gid

#
  # Updates modification time (mtime) and access time (atime) of file(s) in
  # +list+.  Files are created if they don't exist.
  #
  #   FileUtils.touch 'timestamp'
  #   FileUtils.touch Dir.glob('*.c');  system 'make'
  #
  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
  module_function :touch

private

module StreamUtils_
    private

case (defined?(::RbConfig) ? ::RbConfig::CONFIG['host_os'] : ::RUBY_PLATFORM)
    when /mswin|mingw/
      def fu_windows?; true end
    else
      def fu_windows?; false end
    end

def fu_copy_stream0(src, dest, blksize = nil)   #:nodoc:
      IO.copy_stream(src, dest)
    end

def fu_stream_blksize(*streams)
      streams.each do |s|
        next unless s.respond_to?(:stat)
        size = fu_blksize(s.stat)
        return size if size
      end
      fu_default_blksize()
    end

def fu_blksize(st)
      s = st.blksize
      return nil unless s
      return nil if s == 0
      s
    end

def fu_default_blksize
      1024
    end
  end

include StreamUtils_
  extend StreamUtils_

class Entry_   #:nodoc: internal use only
    include StreamUtils_

def initialize(a, b = nil, deref = false)
      @prefix = @rel = @path = nil
      if b
        @prefix = a
        @rel = b
      else
        @path = a
      end
      @deref = deref
      @stat = nil
      @lstat = nil
    end

def inspect
      "\#<#{self.class} #{path()}>"
    end

def path
      if @path
        File.path(@path)
      else
        join(@prefix, @rel)
      end
    end

def prefix
      @prefix || @path
    end

def rel
      @rel
    end

def dereference?
      @deref
    end

def exist?
      begin
        lstat
        true
      rescue Errno::ENOENT
        false
      end
    end

def file?
      s = lstat!
      s and s.file?
    end

def directory?
      s = lstat!
      s and s.directory?
    end

def symlink?
      s = lstat!
      s and s.symlink?
    end

def chardev?
      s = lstat!
      s and s.chardev?
    end

def blockdev?
      s = lstat!
      s and s.blockdev?
    end

def socket?
      s = lstat!
      s and s.socket?
    end

def pipe?
      s = lstat!
      s and s.pipe?
    end

S_IF_DOOR = 0xD000

def door?
      s = lstat!
      s and (s.mode & 0xF000 == S_IF_DOOR)
    end

def entries
      opts = {}
      opts[:encoding] = fu_windows? ? ::Encoding::UTF_8 : path.encoding

files = Dir.children(path, **opts)

untaint = RUBY_VERSION < '2.7'
      files.map {|n| Entry_.new(prefix(), join(rel(), untaint ? n.untaint : n)) }
    end

def stat
      return @stat if @stat
      if lstat() and lstat().symlink?
        @stat = File.stat(path())
      else
        @stat = lstat()
      end
      @stat
    end

def stat!
      return @stat if @stat
      if lstat! and lstat!.symlink?
        @stat = File.stat(path())
      else
        @stat = lstat!
      end
      @stat
    rescue SystemCallError
      nil
    end

def lstat
      if dereference?
        @lstat ||= File.stat(path())
      else
        @lstat ||= File.lstat(path())
      end
    end

def lstat!
      lstat()
    rescue SystemCallError
      nil
    end

def chmod(mode)
      if symlink?
        File.lchmod mode, path() if have_lchmod?
      else
        File.chmod mode, path()
      end
    rescue Errno::EOPNOTSUPP
    end

def chown(uid, gid)
      if symlink?
        File.lchown uid, gid, path() if have_lchown?
      else
        File.chown uid, gid, path()
      end
    end

def link(dest)
      case
      when directory?
        if !File.exist?(dest) and descendant_directory?(dest, path)
          raise ArgumentError, "cannot link directory %s to itself %s" % [path, dest]
        end
        begin
          Dir.mkdir dest
        rescue
          raise unless File.directory?(dest)
        end
      else
        File.link path(), dest
      end
    end

def copy(dest)
      lstat
      case
      when file?
        copy_file dest
      when directory?
        if !File.exist?(dest) and descendant_directory?(dest, path)
          raise ArgumentError, "cannot copy directory %s to itself %s" % [path, dest]
        end
        begin
          Dir.mkdir dest
        rescue
          raise unless File.directory?(dest)
        end
      when symlink?
        File.symlink File.readlink(path()), dest
      when chardev?, blockdev?
        raise "cannot handle device file"
      when socket?
        begin
          require 'socket'
        rescue LoadError
          raise "cannot handle socket"
        else
          raise "cannot handle socket" unless defined?(UNIXServer)
        end
        UNIXServer.new(dest).close
        File.chmod lstat().mode, dest
      when pipe?
        raise "cannot handle FIFO" unless File.respond_to?(:mkfifo)
        File.mkfifo dest, lstat().mode
      when door?
        raise "cannot handle door: #{path()}"
      else
        raise "unknown file type: #{path()}"
      end
    end

def copy_file(dest)
      File.open(path()) do |s|
        File.open(dest, 'wb', s.stat.mode) do |f|
          IO.copy_stream(s, f)
        end
      end
    end

def copy_metadata(path)
      st = lstat()
      if !st.symlink?
        File.utime st.atime, st.mtime, path
      end
      mode = st.mode
      begin
        if st.symlink?
          begin
            File.lchown st.uid, st.gid, path
          rescue NotImplementedError
          end
        else
          File.chown st.uid, st.gid, path
        end
      rescue Errno::EPERM, Errno::EACCES
        # clear setuid/setgid
        mode &= 01777
      end
      if st.symlink?
        begin
          File.lchmod mode, path
        rescue NotImplementedError, Errno::EOPNOTSUPP
        end
      else
        File.chmod mode, path
      end
    end

def remove
      if directory?
        remove_dir1
      else
        remove_file
      end
    end

def remove_dir1
      platform_support {
        Dir.rmdir path().chomp(?/)
      }
    end

def remove_file
      platform_support {
        File.unlink path
      }
    end

def platform_support
      return yield unless fu_windows?
      first_time_p = true
      begin
        yield
      rescue Errno::ENOENT
        raise
      rescue => err
        if first_time_p
          first_time_p = false
          begin
            File.chmod 0700, path()   # Windows does not have symlink
            retry
          rescue SystemCallError
          end
        end
        raise err
      end
    end

def preorder_traverse
      stack = [self]
      while ent = stack.pop
        yield ent
        stack.concat ent.entries.reverse if ent.directory?
      end
    end

alias traverse preorder_traverse

def postorder_traverse
      if directory?
        entries().each do |ent|
          ent.postorder_traverse do |e|
            yield e
          end
        end
      end
    ensure
      yield self
    end

def wrap_traverse(pre, post)
      pre.call self
      if directory?
        entries.each do |ent|
          ent.wrap_traverse pre, post
        end
      end
      post.call self
    end

private

@@fileutils_rb_have_lchmod = nil

def have_lchmod?
      # This is not MT-safe, but it does not matter.
      if @@fileutils_rb_have_lchmod == nil
        @@fileutils_rb_have_lchmod = check_have_lchmod?
      end
      @@fileutils_rb_have_lchmod
    end

def check_have_lchmod?
      return false unless File.respond_to?(:lchmod)
      File.lchmod 0
      return true
    rescue NotImplementedError
      return false
    end

@@fileutils_rb_have_lchown = nil

def have_lchown?
      # This is not MT-safe, but it does not matter.
      if @@fileutils_rb_have_lchown == nil
        @@fileutils_rb_have_lchown = check_have_lchown?
      end
      @@fileutils_rb_have_lchown
    end

def check_have_lchown?
      return false unless File.respond_to?(:lchown)
      File.lchown nil, nil
      return true
    rescue NotImplementedError
      return false
    end

def join(dir, base)
      return File.path(dir) if not base or base == '.'
      return File.path(base) if not dir or dir == '.'
      begin
        File.join(dir, base)
      rescue EncodingError
        if fu_windows?
          File.join(dir.encode(::Encoding::UTF_8), base.encode(::Encoding::UTF_8))
        else
          raise
        end
      end
    end

if File::ALT_SEPARATOR
      DIRECTORY_TERM = "(?=[/#{Regexp.quote(File::ALT_SEPARATOR)}]|\\z)"
    else
      DIRECTORY_TERM = "(?=/|\\z)"
    end

def descendant_directory?(descendant, ascendant)
      if File::FNM_SYSCASE.nonzero?
        File.expand_path(File.dirname(descendant)).casecmp(File.expand_path(ascendant)) == 0
      else
        File.expand_path(File.dirname(descendant)) == File.expand_path(ascendant)
      end
    end
  end   # class Entry_

def fu_list(arg)   #:nodoc:
    [arg].flatten.map {|path| File.path(path) }
  end
  private_module_function :fu_list

def fu_each_src_dest(src, dest)   #:nodoc:
    fu_each_src_dest0(src, dest) do |s, d|
      raise ArgumentError, "same file: #{s} and #{d}" if fu_same?(s, d)
      yield s, d
    end
  end
  private_module_function :fu_each_src_dest

def fu_each_src_dest0(src, dest)   #:nodoc:
    if tmp = Array.try_convert(src)
      tmp.each do |s|
        s = File.path(s)
        yield s, File.join(dest, File.basename(s))
      end
    else
      src = File.path(src)
      if File.directory?(dest)
        yield src, File.join(dest, File.basename(src))
      else
        yield src, File.path(dest)
      end
    end
  end
  private_module_function :fu_each_src_dest0

def fu_same?(a, b)   #:nodoc:
    File.identical?(a, b)
  end
  private_module_function :fu_same?

def fu_output_message(msg)   #:nodoc:
    output = @fileutils_output if defined?(@fileutils_output)
    output ||= $stdout
    if defined?(@fileutils_label)
      msg = @fileutils_label + msg
    end
    output.puts msg
  end
  private_module_function :fu_output_message

# This hash table holds command options.
  OPT_TABLE = {}    #:nodoc: internal use only
  (private_instance_methods & methods(false)).inject(OPT_TABLE) {|tbl, name|
    (tbl[name.to_s] = instance_method(name).parameters).map! {|t, n| n if t == :key}.compact!
    tbl
  }

public

#
  # Returns an Array of names of high-level methods that accept any keyword
  # arguments.
  #
  #   p FileUtils.commands  #=> ["chmod", "cp", "cp_r", "install", ...]
  #
  def self.commands
    OPT_TABLE.keys
  end

#
  # Returns an Array of option names.
  #
  #   p FileUtils.options  #=> ["noop", "force", "verbose", "preserve", "mode"]
  #
  def self.options
    OPT_TABLE.values.flatten.uniq.map {|sym| sym.to_s }
  end

#
  # Returns true if the method +mid+ have an option +opt+.
  #
  #   p FileUtils.have_option?(:cp, :noop)     #=> true
  #   p FileUtils.have_option?(:rm, :force)    #=> true
  #   p FileUtils.have_option?(:rm, :preserve) #=> false
  #
  def self.have_option?(mid, opt)
    li = OPT_TABLE[mid.to_s] or raise ArgumentError, "no such method: #{mid}"
    li.include?(opt)
  end

#
  # Returns an Array of option names of the method +mid+.
  #
  #   p FileUtils.options_of(:rm)  #=> ["noop", "verbose", "force"]
  #
  def self.options_of(mid)
    OPT_TABLE[mid.to_s].map {|sym| sym.to_s }
  end

#
  # Returns an Array of methods names which have the option +opt+.
  #
  #   p FileUtils.collect_method(:preserve) #=> ["cp", "cp_r", "copy", "install"]
  #
  def self.collect_method(opt)
    OPT_TABLE.keys.select {|m| OPT_TABLE[m].include?(opt) }
  end

private

LOW_METHODS = singleton_methods(false) - collect_method(:noop).map(&:intern) # :nodoc:
  module LowMethods # :nodoc: internal use only
    private
    def _do_nothing(*)end
    ::FileUtils::LOW_METHODS.map {|name| alias_method name, :_do_nothing}
  end

METHODS = singleton_methods() - [:private_module_function,                  # :nodoc:
      :commands, :options, :have_option?, :options_of, :collect_method]

#
  # This module has all methods of FileUtils module, but it outputs messages
  # before acting.  This equates to passing the <tt>:verbose</tt> flag to
  # methods in FileUtils.
  #
  module Verbose
    include FileUtils
    names = ::FileUtils.collect_method(:verbose)
    names.each do |name|
      module_eval(<<-EOS, __FILE__, __LINE__ + 1)
        def #{name}(*args, **options)
          super(*args, **options, verbose: true)
        end
      EOS
    end
    private(*names)
    extend self
    class << self
      public(*::FileUtils::METHODS)
    end
  end

#
  # This module has all methods of FileUtils module, but never changes
  # files/directories.  This equates to passing the <tt>:noop</tt> flag
  # to methods in FileUtils.
  #
  module NoWrite
    include FileUtils
    include LowMethods
    names = ::FileUtils.collect_method(:noop)
    names.each do |name|
      module_eval(<<-EOS, __FILE__, __LINE__ + 1)
        def #{name}(*args, **options)
          super(*args, **options, noop: true)
        end
      EOS
    end
    private(*names)
    extend self
    class << self
      public(*::FileUtils::METHODS)
    end
  end

#
  # This module has all methods of FileUtils module, but never changes
  # files/directories, with printing message before acting.
  # This equates to passing the <tt>:noop</tt> and <tt>:verbose</tt> flag
  # to methods in FileUtils.
  #
  module DryRun
    include FileUtils
    include LowMethods
    names = ::FileUtils.collect_method(:noop)
    names.each do |name|
      module_eval(<<-EOS, __FILE__, __LINE__ + 1)
        def #{name}(*args, **options)
          super(*args, **options, noop: true, verbose: true)
        end
      EOS
    end
    private(*names)
    extend self
    class << self
      public(*::FileUtils::METHODS)
    end
  end

end

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