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#
# $Id$
#
# The class for temporary files.
# o creates a temporary file, which name is "basename.pid.n" with mode "w+".
# o Tempfile objects can be used like IO object.
# o with tmpfile.close(true) created temporary files are removed.
# o created files are also removed on script termination.
# o with Tempfile#open, you can reopen the temporary file.
# o file mode of the temporary files are 0600.
require 'delegate'
class Tempfile < SimpleDelegator
Max_try = 10
def Tempfile.callback(path, data)
lambda{
print "removing ", path, "..." if $DEBUG
data[0].close if data[0]
if File.exist?(path)
File.unlink(path)
end
if File.exist?(path + '.lock')
Dir.rmdir(path + '.lock')
end
print "done\n" if $DEBUG
}
end
def initialize(basename, tmpdir=ENV['TMPDIR']||ENV['TMP']||ENV['TEMP']||'/tmp')
if $SAFE > 0 and tmpdir.tainted?
tmpdir = '/tmp'
end
umask = File.umask(0177)
begin
n = 0
while true
begin
tmpname = sprintf('%s/%s%d.%d', tmpdir, basename, $$, n)
lock = tmpname + '.lock'
unless File.exist?(tmpname) or File.exist?(lock)
Dir.mkdir(lock)
break
end
rescue
raise "cannot generate tmpfile `%s'" % tmpname if n >= Max_try
#sleep(1)
end
n += 1
end
@protect = []
@clean_files = Tempfile.callback(tmpname, @protect)
ObjectSpace.define_finalizer(self, @clean_files)
@tmpfile = File.open(tmpname, File::RDWR|File::CREAT|File::EXCL)
@protect[0] = @tmpfile
@tmpname = tmpname
super(@tmpfile)
Dir.rmdir(lock)
ensure
File.umask(umask)
end
end
def Tempfile.open(*args)
Tempfile.new(*args)
end
def open
@tmpfile.close if @tmpfile
@tmpfile = File.open(@tmpname, 'r+')
@protect[0] = @tmpfile
__setobj__(@tmpfile)
end
def close(real=false)
@tmpfile.close if @tmpfile
@protect[0] = @tmpfile = nil
if real
@clean_files.call
ObjectSpace.undefine_finalizer(self)
end
end
def path
@tmpname
end
end
if __FILE__ == $0
# $DEBUG = true
f = Tempfile.new("foo")
f.print("foo\n")
f.close
f.open
p f.gets # => "foo\n"
f.close(true)
end
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