Sorry, I hadn't tested the previous patch.  There are a couple of
extra `my's needed.

Ian.

diff -bB --exclude='*~' --exclude='*.orig' --exclude='*.rej' -ruN 
in/debian/dpkg-1.14.4/scripts/dpkg-source.pl 
construct/dpkg-1.14.4/scripts/dpkg-source.pl
--- in/debian/dpkg-1.14.4/scripts/dpkg-source.pl        2007-05-23 
00:13:49.000000000 +0100
+++ construct/dpkg-1.14.4/scripts/dpkg-source.pl        2007-05-30 
20:43:31.000000000 +0100
@@ -817,10 +832,8 @@
        (my $t = $target) =~ s!.*/!!;
 
        mkdir($tmp,0700) || &syserr(sprintf(_g("unable to create `%s'"), $tmp));
-       system "chmod", "g-s", $tmp;
        printf(_g("%s: unpacking %s")."\n", $progname, $tarfile);
        extracttar("$dscdir/$tarfile",$tmp,$t);
-       system "chown", '-R', '-f', join(':', getfowner()), "$tmp/$t";
        rename("$tmp/$t",$target)
            || &syserr(sprintf(_g("unable to rename `%s' to `%s'"), "$tmp/$t", 
$target));
        rmdir($tmp)
@@ -1298,19 +1311,49 @@
 
 sub extracttar {
     my ($tarfileread,$dirchdir,$newtopdir) = @_;
+    my ($mode, $modes_set, $i, $j);
     &forkgzipread("$tarfileread");
     defined(my $c2 = fork) || syserr(_g("fork for tar -xkf -"));
     if (!$c2) {
         open(STDIN,"<&GZIP") || &syserr(_g("reopen gzip for tar -xkf -"));
         &cpiostderr;
         chdir($dirchdir) || &syserr(sprintf(_g("cannot chdir to `%s' for tar 
extract"), $dirchdir));
-        exec('tar','-xkf','-') or &syserr(_g("exec tar -xkf -"));
+        exec('tar','--no-same-owner','--no-same-permissions',
+            '-xkf','-') or &syserr(_g("exec tar -xkf -"));
     }
     close(GZIP);
     $c2 == waitpid($c2,0) || &syserr(_g("wait for tar -xkf -"));
     $? && subprocerr("tar -xkf -");
     &reapgzip;
 
+    # Unfortunately tar insists on applying our umask _to the original
+    # permissions_ rather than mostly-ignoring the original
+    # permissions.  We fix it up with chmod -R (which saves us some
+    # work) but we have to construct a u+/- string which is a bit
+    # of a palaver.  (Numeric doesn't work because we need [ugo]+X
+    # and [ugo]=<stuff> doesn't work because that unsets sgid on dirs.)
+    #
+    # We still need --no-same-permissions because otherwise tar might
+    # extract directory setgid (which we want inherited, not
+    # extracted); we need --no-same-owner because putting the owner
+    # back is tedious - in particular, correct group ownership would
+    # have to be calculated using mount options and other madness.
+    #
+    # It would be nice if tar could do it right, or if pax could cope
+    # with GNU format tarfiles with long filenames.
+    #
+    $mode= 0777 & ~umask;
+    for ($i=0; $i<9; $i+=3) {
+       $modes_set.= ',' if $i;
+       $modes_set.= qw(u g o)[$i/3];
+       for ($j=0; $j<3; $j++) {
+           $modes_set.= $mode & (0400 >> ($i+$j)) ? '+' : '-';
+           $modes_set.= qw(r w X)[$j];
+       }
+    }
+    system 'chmod','-R',$modes_set,'--',$dirchdir;
+    $? && subprocerr("chmod -R $modes_set $dirchdir");
+     
     opendir(D,"$dirchdir") || &syserr(sprintf(_g("Unable to open dir %s"), 
$dirchdir));
     my @dirchdirfiles = grep($_ ne "." && $_ ne "..", readdir(D));
     closedir(D) || &syserr(sprintf(_g("Unable to close dir %s"), $dirchdir));


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