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tarrubyscript.rb
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tarrubyscript.rb
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# License of this script, not of the application it contains:
#
# Copyright Erik Veenstra <tar2rubyscript@erikveen.dds.nl>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License,
# version 2, as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
# PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public
# License along with this program; if not, write to the Free
# Software Foundation, Inc., 59 Temple Place, Suite 330,
# Boston, MA 02111-1307 USA.
# Parts of this code are based on code from Thomas Hurst
# <tom@hur.st>.
# Tar2RubyScript constants
unless defined?(BLOCKSIZE)
ShowContent = ARGV.include?("--tar2rubyscript-list")
JustExtract = ARGV.include?("--tar2rubyscript-justextract")
ToTar = ARGV.include?("--tar2rubyscript-totar")
Preserve = ARGV.include?("--tar2rubyscript-preserve")
end
ARGV.concat []
ARGV.delete_if{|arg| arg =~ /^--tar2rubyscript-/}
ARGV << "--tar2rubyscript-preserve" if Preserve
# Tar constants
unless defined?(BLOCKSIZE)
BLOCKSIZE = 512
NAMELEN = 100
MODELEN = 8
UIDLEN = 8
GIDLEN = 8
CHKSUMLEN = 8
SIZELEN = 12
MAGICLEN = 8
MODTIMELEN = 12
UNAMELEN = 32
GNAMELEN = 32
DEVLEN = 8
TMAGIC = "ustar"
GNU_TMAGIC = "ustar "
SOLARIS_TMAGIC = "ustar\00000"
MAGICS = [TMAGIC, GNU_TMAGIC, SOLARIS_TMAGIC]
LF_OLDFILE = '\0'
LF_FILE = '0'
LF_LINK = '1'
LF_SYMLINK = '2'
LF_CHAR = '3'
LF_BLOCK = '4'
LF_DIR = '5'
LF_FIFO = '6'
LF_CONTIG = '7'
GNUTYPE_DUMPDIR = 'D'
GNUTYPE_LONGLINK = 'K' # Identifies the *next* file on the tape as having a long linkname.
GNUTYPE_LONGNAME = 'L' # Identifies the *next* file on the tape as having a long name.
GNUTYPE_MULTIVOL = 'M' # This is the continuation of a file that began on another volume.
GNUTYPE_NAMES = 'N' # For storing filenames that do not fit into the main header.
GNUTYPE_SPARSE = 'S' # This is for sparse files.
GNUTYPE_VOLHDR = 'V' # This file is a tape/volume header. Ignore it on extraction.
end
class Dir
def self.rm_rf(entry)
begin
File.chmod(0755, entry)
rescue
end
if File.ftype(entry) == "directory"
pdir = Dir.pwd
Dir.chdir(entry)
Dir.open(".") do |d|
d.each do |e|
Dir.rm_rf(e) if not [".", ".."].include?(e)
end
end
Dir.chdir(pdir)
begin
Dir.delete(entry)
rescue => e
$stderr.puts e.message
end
else
begin
File.delete(entry)
rescue => e
$stderr.puts e.message
end
end
end
end
class Reader
def initialize(filehandle)
@fp = filehandle
end
def extract
each do |entry|
entry.extract
end
end
def list
each do |entry|
entry.list
end
end
def each
@fp.rewind
while entry = next_entry
yield(entry)
end
end
def next_entry
buf = @fp.read(BLOCKSIZE)
if buf.length < BLOCKSIZE or buf == "\000" * BLOCKSIZE
entry = nil
else
entry = Entry.new(buf, @fp)
end
entry
end
end
class Entry
attr_reader(:header, :data)
def initialize(header, fp)
@header = Header.new(header)
readdata =
lambda do |header|
padding = (BLOCKSIZE - (header.size % BLOCKSIZE)) % BLOCKSIZE
@data = fp.read(header.size) if header.size > 0
dummy = fp.read(padding) if padding > 0
end
readdata.call(@header)
if @header.longname?
gnuname = @data[0..-2]
header = fp.read(BLOCKSIZE)
@header = Header.new(header)
@header.name = gnuname
readdata.call(@header)
end
end
def extract
if not @header.name.empty?
if @header.symlink?
begin
File.symlink(@header.linkname, @header.name)
rescue SystemCallError => e
$stderr.puts "Couldn't create symlink #{@header.name}: " + e.message
end
elsif @header.link?
begin
File.link(@header.linkname, @header.name)
rescue SystemCallError => e
$stderr.puts "Couldn't create link #{@header.name}: " + e.message
end
elsif @header.dir?
begin
Dir.mkdir(@header.name, @header.mode)
rescue SystemCallError => e
$stderr.puts "Couldn't create dir #{@header.name}: " + e.message
end
elsif @header.file?
begin
File.open(@header.name, "wb") do |fp|
fp.write(@data)
fp.chmod(@header.mode)
end
rescue => e
$stderr.puts "Couldn't create file #{@header.name}: " + e.message
end
else
$stderr.puts "Couldn't handle entry #{@header.name} (flag=#{@header.linkflag.inspect})."
end
#File.chown(@header.uid, @header.gid, @header.name)
#File.utime(Time.now, @header.mtime, @header.name)
end
end
def list
if not @header.name.empty?
if @header.symlink?
$stderr.puts "s %s -> %s" % [@header.name, @header.linkname]
elsif @header.link?
$stderr.puts "l %s -> %s" % [@header.name, @header.linkname]
elsif @header.dir?
$stderr.puts "d %s" % [@header.name]
elsif @header.file?
$stderr.puts "f %s (%s)" % [@header.name, @header.size]
else
$stderr.puts "Couldn't handle entry #{@header.name} (flag=#{@header.linkflag.inspect})."
end
end
end
end
class Header
attr_reader(:name, :uid, :gid, :size, :mtime, :uname, :gname, :mode, :linkflag, :linkname)
attr_writer(:name)
def initialize(header)
fields = header.unpack('A100 A8 A8 A8 A12 A12 A8 A1 A100 A8 A32 A32 A8 A8')
types = ['str', 'oct', 'oct', 'oct', 'oct', 'time', 'oct', 'str', 'str', 'str', 'str', 'str', 'oct', 'oct']
begin
converted = []
while field = fields.shift
type = types.shift
case type
when 'str' then converted.push(field)
when 'oct' then converted.push(field.oct)
when 'time' then converted.push(Time::at(field.oct))
end
end
@name, @mode, @uid, @gid, @size, @mtime, @chksum, @linkflag, @linkname, @magic, @uname, @gname, @devmajor, @devminor = converted
@name.gsub!(/^\.\//, "")
@linkname.gsub!(/^\.\//, "")
@raw = header
rescue ArgumentError => e
raise "Couldn't determine a real value for a field (#{field})"
end
raise "Magic header value #{@magic.inspect} is invalid." if not MAGICS.include?(@magic)
@linkflag = LF_FILE if @linkflag == LF_OLDFILE or @linkflag == LF_CONTIG
@linkflag = LF_DIR if @linkflag == LF_FILE and @name[-1] == '/'
@size = 0 if @size < 0
end
def file?
@linkflag == LF_FILE
end
def dir?
@linkflag == LF_DIR
end
def symlink?
@linkflag == LF_SYMLINK
end
def link?
@linkflag == LF_LINK
end
def longname?
@linkflag == GNUTYPE_LONGNAME
end
end
class Content
@@count = 0 unless defined?(@@count)
def initialize
@@count += 1
@archive = File.open(File.expand_path(__FILE__), "rb"){|f| f.read}.gsub(/\r/, "").split(/\n\n/)[-1].split("\n").collect{|s| s[2..-1]}.join("\n").unpack("m").shift
temp = ENV["TEMP"]
temp = "/tmp" if temp.nil?
temp = File.expand_path(temp)
@tempfile = "#{temp}/tar2rubyscript.f.#{Process.pid}.#{@@count}"
end
def list
begin
File.open(@tempfile, "wb") {|f| f.write @archive}
File.open(@tempfile, "rb") {|f| Reader.new(f).list}
ensure
File.delete(@tempfile)
end
self
end
def cleanup
@archive = nil
self
end
end
class TempSpace
@@count = 0 unless defined?(@@count)
def initialize
@@count += 1
@archive = File.open(File.expand_path(__FILE__), "rb"){|f| f.read}.gsub(/\r/, "").split(/\n\n/)[-1].split("\n").collect{|s| s[2..-1]}.join("\n").unpack("m").shift
@olddir = Dir.pwd
temp = ENV["TEMP"]
temp = "/tmp" if temp.nil?
temp = File.expand_path(temp)
@tempfile = "#{temp}/tar2rubyscript.f.#{Process.pid}.#{@@count}"
@tempdir = "#{temp}/tar2rubyscript.d.#{Process.pid}.#{@@count}"
@@tempspace = self
@newdir = @tempdir
@touchthread =
Thread.new do
loop do
sleep 60*60
touch(@tempdir)
touch(@tempfile)
end
end
end
def extract
Dir.rm_rf(@tempdir) if File.exists?(@tempdir)
Dir.mkdir(@tempdir)
newlocation do
# Create the temp environment.
File.open(@tempfile, "wb") {|f| f.write @archive}
File.open(@tempfile, "rb") {|f| Reader.new(f).extract}
# Eventually look for a subdirectory.
entries = Dir.entries(".")
entries.delete(".")
entries.delete("..")
if entries.length == 1
entry = entries.shift.dup
if File.directory?(entry)
@newdir = "#{@tempdir}/#{entry}"
end
end
end
# Remember all File objects.
@ioobjects = []
ObjectSpace::each_object(File) do |obj|
@ioobjects << obj
end
at_exit do
@touchthread.kill
# Close all File objects, opened in init.rb .
ObjectSpace::each_object(File) do |obj|
obj.close if (not obj.closed? and not @ioobjects.include?(obj))
end
# Remove the temp environment.
Dir.chdir(@olddir)
Dir.rm_rf(@tempfile)
Dir.rm_rf(@tempdir)
end
self
end
def cleanup
@archive = nil
self
end
def touch(entry)
entry = entry.gsub!(/[\/\\]*$/, "") unless entry.nil?
return unless File.exists?(entry)
if File.directory?(entry)
pdir = Dir.pwd
begin
Dir.chdir(entry)
begin
Dir.open(".") do |d|
d.each do |e|
touch(e) unless [".", ".."].include?(e)
end
end
ensure
Dir.chdir(pdir)
end
rescue Errno::EACCES => error
$stderr.puts error
end
else
File.utime(Time.now, File.mtime(entry), entry)
end
end
def oldlocation(file="")
if block_given?
pdir = Dir.pwd
Dir.chdir(@olddir)
res = yield
Dir.chdir(pdir)
else
res = File.expand_path(file, @olddir) if not file.nil?
end
res
end
def newlocation(file="")
if block_given?
pdir = Dir.pwd
Dir.chdir(@newdir)
res = yield
Dir.chdir(pdir)
else
res = File.expand_path(file, @newdir) if not file.nil?
end
res
end
def templocation(file="")
if block_given?
pdir = Dir.pwd
Dir.chdir(@tempdir)
res = yield
Dir.chdir(pdir)
else
res = File.expand_path(file, @tempdir) if not file.nil?
end
res
end
def self.oldlocation(file="")
if block_given?
@@tempspace.oldlocation { yield }
else
@@tempspace.oldlocation(file)
end
end
def self.newlocation(file="")
if block_given?
@@tempspace.newlocation { yield }
else
@@tempspace.newlocation(file)
end
end
def self.templocation(file="")
if block_given?
@@tempspace.templocation { yield }
else
@@tempspace.templocation(file)
end
end
end
class Extract
@@count = 0 unless defined?(@@count)
def initialize
@archive = File.open(File.expand_path(__FILE__), "rb"){|f| f.read}.gsub(/\r/, "").split(/\n\n/)[-1].split("\n").collect{|s| s[2..-1]}.join("\n").unpack("m").shift
temp = ENV["TEMP"]
temp = "/tmp" if temp.nil?
@tempfile = "#{temp}/tar2rubyscript.f.#{Process.pid}.#{@@count += 1}"
end
def extract
begin
File.open(@tempfile, "wb") {|f| f.write @archive}
File.open(@tempfile, "rb") {|f| Reader.new(f).extract}
ensure
File.delete(@tempfile)
end
self
end
def cleanup
@archive = nil
self
end
end
class MakeTar
def initialize
@archive = File.open(File.expand_path(__FILE__), "rb"){|f| f.read}.gsub(/\r/, "").split(/\n\n/)[-1].split("\n").collect{|s| s[2..-1]}.join("\n").unpack("m").shift
@tarfile = File.expand_path(__FILE__).gsub(/\.rbw?$/, "") + ".tar"
end
def extract
File.open(@tarfile, "wb") {|f| f.write @archive}
self
end
def cleanup
@archive = nil
self
end
end
def oldlocation(file="")
if block_given?
TempSpace.oldlocation { yield }
else
TempSpace.oldlocation(file)
end
end
def newlocation(file="")
if block_given?
TempSpace.newlocation { yield }
else
TempSpace.newlocation(file)
end
end
def templocation(file="")
if block_given?
TempSpace.templocation { yield }
else
TempSpace.templocation(file)
end
end
if ShowContent
Content.new.list.cleanup
elsif JustExtract
Extract.new.extract.cleanup
elsif ToTar
MakeTar.new.extract.cleanup
else
TempSpace.new.extract.cleanup
$:.unshift(templocation)
$:.unshift(newlocation)
$:.push(oldlocation)
verbose = $VERBOSE
$VERBOSE = nil
s = ENV["PATH"].dup
if Dir.pwd[1..2] == ":/" # Hack ???
s << ";#{templocation.gsub(/\//, "\\")}"
s << ";#{newlocation.gsub(/\//, "\\")}"
s << ";#{oldlocation.gsub(/\//, "\\")}"
else
s << ":#{templocation}"
s << ":#{newlocation}"
s << ":#{oldlocation}"
end
ENV["PATH"] = s
$VERBOSE = verbose
TAR2RUBYSCRIPT = true unless defined?(TAR2RUBYSCRIPT)
newlocation do
if __FILE__ == $0
$_0 = File.expand_path("./init.rb")
alias $__0 $0
alias $0 $_0
if File.file?("./init.rb")
load File.expand_path("./init.rb")
else
$stderr.puts "%s doesn't contain an init.rb ." % __FILE__
end
else
if File.file?("./init.rb")
load File.expand_path("./init.rb")
end
end
end
end