Ticket #2910: enter into symlink to commpressed patch shows empty patch.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

src/vfs/extfs/helpers/patchfs.in

@@ -380,25 +380,31 @@ sub copyin($$$) {
       or error "Can't write to archive";
 }
 
+my $fin = $ARGV[1];
+
+# resolve symlink
+while (-l $fin) {
+    $fin = readlink $fin;
+}
 
 if ($ARGV[0] eq 'list') {
-    open I, myin($ARGV[1]).'|';
-    list ($ARGV[1]);
+    open I, myin($fin).'|';
+    list ($fin);
     exit 0;
 } elsif ($ARGV[0] eq 'copyout') {
-    open I, myin($ARGV[1])."|";
+    open I, myin($fin)."|";
     copyout ($ARGV[2], $ARGV[3]);
     exit 0;
 } elsif ($ARGV[0] eq 'rm') {
-    open I, myin($ARGV[1])."|";
-    rm ($ARGV[1], $ARGV[2]);
+    open I, myin($fin)."|";
+    rm ($fin, $ARGV[2]);
     exit 0;
 } elsif ($ARGV[0] eq 'rmdir') {
     exit 0;
 } elsif ($ARGV[0] eq 'mkdir') {
     exit 0;
 } elsif ($ARGV[0] eq 'copyin') {
-    copyin ($ARGV[1], $ARGV[2], $ARGV[3]);
+    copyin ($fin, $ARGV[2], $ARGV[3]);
     exit 0;
 }
 exit 1;