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Re: difflog.pl and "security"
- X-seq: zsh-workers 24147
- From: Wayne Davison <wayned@xxxxxxxxxxxxxxxxxxxxx>
- To: Peter Stephenson <pws@xxxxxxx>
- Subject: Re: difflog.pl and "security"
- Date: Mon, 3 Dec 2007 13:36:04 -0800
- Cc: zsh-workers@xxxxxxxxxx
- In-reply-to: <20071203104256.09dc9684@news01>
- Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm
- References: <20071202214005.GA6517@xxxxxxxxxxx> <071202174520.ZM3017@xxxxxxxxxxxxxxxxxxxxxx> <20071203104256.09dc9684@news01>
On Mon, Dec 03, 2007 at 10:42:56AM +0000, Peter Stephenson wrote:
> Maybe we should simply leave it out of the distribution (but leave it in
> the archive), since it's essentially no use unless you have a CVS tree.
Seems quite reasonable to me. I also coded up an improved version that
uses File::Temp. I also changed the opening of the DIFF pipe to use a
newer, safer exec syntax (since we don't need this to be very portable,
I figure the perl version should be recent enough for anyone who might
be using the script).
..wayne..
--- difflog.pl 18 Apr 2002 14:35:17 -0000 1.3
+++ difflog.pl 3 Dec 2007 21:32:03 -0000
@@ -2,10 +2,9 @@
use strict;
use IO::File;
+use File::Temp qw(tempfile);
my @differ = qw(diff -bw);
-my $oldtmp = "/tmp/difflog$$.old";
-my $newtmp = "/tmp/difflog$$.new";
my $newfn = pop(@ARGV);
my $oldfn = pop(@ARGV);
@@ -36,16 +35,17 @@ while ($old < @oldentries && $new < @new
else
{
if ($oldhash{$oldentries[$old]} ne $newhash{$newentries[$new]}) {
- my $oldfh = new IO::File("/tmp/difflog$$.old", 'w');
- $oldfh->print($oldhash{$oldentries[$old]});
- $oldfh->close();
- my $newfh = new IO::File("/tmp/difflog$$.new", 'w');
- $newfh->print($newhash{$newentries[$new]});
- $newfh->close();
- open(DIFF, join(' ', @differ, @ARGV, $oldtmp, $newtmp, '|'));
+ my($oldfh, $oldtmp) = tempfile('difflog-XXXXXXXX', SUFFIX => '.old', DIR => '/tmp');
+ print $oldfh $oldhash{$oldentries[$old]};
+ close $oldfh;
+ my($newfh, $newtmp) = tempfile('difflog-XXXXXXXX', SUFFIX => '.new', DIR => '/tmp');
+ print $newfh $newhash{$newentries[$new]};
+ close $newfh;
+ open(DIFF, '-|', @differ, @ARGV, $oldtmp, $newtmp) or die $!;
my @lines = <DIFF>;
close(DIFF);
- unlink </tmp/difflog$$.*>;
+ unlink($oldtmp);
+ unlink($newtmp);
if (@lines)
{
print "diff for ", $oldentries[$old], ":\n";
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