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ac6314f977
- Does not execute unknown commands nor call sh(1) at all. - Does not overwrite existing files by default. - Does not extract files into upper directories. - Does have a dry run (-n) flag to see what would have been extracted. - Does have a strip (-p N) flag to strip any number of levels from pathnames. It (so far) only supports shell archives made with BSD shar.
300 lines
5.7 KiB
Ruby
Executable File
300 lines
5.7 KiB
Ruby
Executable File
#!/usr/bin/env ruby
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# -*- ruby -*-
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#
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# Copyright (c) 2001-2004 Akinori MUSHA
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#
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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RCS_ID = %q$Idaemons: /home/cvs/sunshar/sunshar.rb,v 1.13 2004/02/28 14:15:47 knu Exp $
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RCS_REVISION = RCS_ID.split[2]
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MYNAME = File.basename($0)
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require 'parsearg'
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require 'fileutils'
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require 'shellwords'
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require 'stringio'
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begin
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require 'features/ruby18/dir'
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rescue LoadError; end
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$USAGE = 'usage'
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$strip_level = 0
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$force = false
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$dryrun = false
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$quiet = false
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$dir = nil
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def info(*s)
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puts(*s) unless $quiet
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end
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def usage
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print <<-EOF
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#{MYNAME} rev.#{RCS_REVISION}
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usage: #{MYNAME} [-fnq] [-p level] [file]
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#{MYNAME} -h
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-d dir chdir -- chdir to dir before extracting files
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-f force -- allow overwriting, ignore errors
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-h help -- show this help
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-n dry run -- show what would have been extracted
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-p N strip -- strip N levels from pathnames (cf. patch(1)\'s -p)
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-q quiet -- be quiet
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EOF
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end
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def main
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parseArgs(0, nil, 'fhnq', 'd:', 'p:')
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if $OPT_h
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usage
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exit 0
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end
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if $OPT_f
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$force = true
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end
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if $OPT_n
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$dryrun = true
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end
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if $OPT_q
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$quiet = true
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end
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$dir = $OPT_d || '.'
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if $OPT_p
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$strip_level = $OPT_p.to_i rescue -1
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if $strip_level < 0
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STDERR.puts "negative value ignored: #{$OPT_p}"
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end
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end
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nerrors = 0
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if ARGV.empty?
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info "extracting files from stdin into #{$dir}"
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begin
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Dir.chdir($dir) {
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unshar_stream(STDIN)
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}
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info "done."
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rescue => e
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STDERR.puts "error in extracting stdin: #{e.message}"
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nerrors += 1
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end
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else
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for file in ARGV
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info "extracting files from #{file} into #{$dir}"
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begin
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File.open(file) do |f|
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Dir.chdir($dir) {
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unshar_stream(f)
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}
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end
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info "done."
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rescue => e
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STDERR.puts "error in extracting #{file}: #{e.message}"
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nerrors += 1
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end
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end
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end
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exit nerrors
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end
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def unshar_stream(io)
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e = nil
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while line = io.gets
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if /^(\s*)\# This is a shell archive/ =~ line
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indent = $1.length
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break
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end
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end
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if io.eof?
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raise "not a shell archive."
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end
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f = nil
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prefix = nil
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file = nil
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boundary = nil
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while line = io.gets
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line.slice!(0, indent)
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if f
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if line.strip == boundary
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f.close
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f = nil
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next
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end
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if line.sub!(/^#{Regexp.quote(prefix)}/, '')
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f.print line
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else
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raise "line #{io.lineno}: broken archive: #{line}"
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end
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next
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end
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case line
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when /^exit\s*$/
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break
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when /^echo\s+(.+)$/
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# info $1
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when /^mkdir\s+(?:-p\s+)?(.+)$/
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dir = nil
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Shellwords.shellwords($1).each do |word|
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if /^[^\-]/ =~ word
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dir = word
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break
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end
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end
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next if dir.nil?
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dir = strip_filename(dir.strip + '/')
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if dir.chomp('/').empty?
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next
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end
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begin
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FileUtils.mkdir_p(dir) unless $dryrun
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info "c - #{dir}"
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rescue => e
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info "c - #{dir} ... failed: #{e.message}"
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raise e
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end
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when /sed\s+(.+)>(.+)<<(.+)/
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prefix = Shellwords.shellwords($1).first
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file = Shellwords.shellwords($2).first
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boundary = Shellwords.shellwords($3).first
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next unless prefix && file && boundary
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if /s(.)\^(.*)\1\1/ =~ prefix
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prefix = $2
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else
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next
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end
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file = strip_filename(file)
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next if file.empty? || boundary.empty?
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overwrite = false
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if File.exist?(file)
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if $force
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overwrite = true
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else
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info "x - #{file} ... skipped"
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next
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end
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end
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dir = File.dirname(file)
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if !File.directory?(dir + "/.")
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begin
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FileUtils.mkdir_p(dir) unless $dryrun
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info "d - #{dir}"
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rescue => e
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info "d - #{dir} ... failed: #{e.message}"
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raise e
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end
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end
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begin
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f = $dryrun ? StringIO.new : File.open(file, 'w')
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if overwrite
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info "x - #{file} ... overwritten"
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else
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info "x - #{file}"
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end
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rescue => e
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info "x - #{file} ... failed! (#{e.message})"
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if $force
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f = nil
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next
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else
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raise e
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end
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end
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end
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end
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raise e if e
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end
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def strip_filename(file)
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sfile = file.gsub(%r"/{2,}", "/")
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if 0 < $strip_level
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sfile.sub!(%r"^([^/]*/){1,#{$strip_level}}", '')
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end
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case sfile
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when %r"^[~/]"
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raise "reference to absolute directory: #{file} (use -p N)"
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when %r"(^|/)\.\.(?:/|$)"
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raise "reference to parent directory: #{file} (use -p N)"
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end
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sfile
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end
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def signal_handler(sig)
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info "\nInterrupted."
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exit 255
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end
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if $0 == __FILE__
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for sig in [2, 3, 15]
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trap(sig) do
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signal_handler(sig)
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end
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end
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main
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end
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