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#
# utils.rb - ruby utilities interface for debian.rb (gunzip, tar, ..)
# Copyright (c) 2001 Fumitoshi UKAI <ukai@debian.or.jp>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# 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
#
# $Id: utils.rb,v 1.2 2003/10/07 17:07:02 ukai Exp $
#
module Debian
module Utils
GUNZIP = '/bin/gunzip'
TAR = '/bin/tar'
TAR_EXTRACT = '-x'
TAR_LIST = '-t'
def Utils.pipeline(io,progs,stderr = false)
Signal.trap('CHLD', 'IGNORE')
# wr0 -> rd0 [gunzip] wr -> rd
rd,wr = IO.pipe
rde,wre = IO.pipe
pid = fork
if pid
# parent
wr.close
wre.close
if block_given?
return yield(rd, rde)
else
return rd, rde
end
else
# child
rd.close
rd0, wr0 = IO.pipe
pid2 = fork
if pid2
# gunzip
wr0.close
STDOUT.reopen(wr)
STDERR.reopen(wre) if stderr
STDIN.reopen(rd0)
ENV["LANG"] = "C"
ENV["LC_ALL"] = "C"
exec(*progs)
# XXX: waitpid(pid2?)
else
rd0.close
while ! io.eof?
wr0.write(io.read(4096))
end
exit 0
end
end
Process.waitpid(pid, 0)
Process.wait
end
def gunzip(io)
Utils.pipeline(io, [GUNZIP]) {|fp,fpe|
fpe.close
if block_given?
return yield(fp)
else
return fp
end
}
end
def tar(io,op,*pat)
progs = [TAR, op, '--wildcards', '-f', '-']
if pat[0]
progs += ['--to-stdout', *pat]
end
Utils.pipeline(io,progs,op == "-t") {|fp,fpe|
if op == "-t"
pid = fork
if pid
# parent
else
while !fpe.eof? && str = fpe.readline
unless str.match(/^\/bin\/tar: Record size = [0-9]+ blocks$/)
STDERR.puts str
end
end
exit
end
end
fpe.close
if block_given?
return yield(fp)
else
return fp
end
}
end
module_function :gunzip, :tar
end
end
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