Merge branch 'gfi-maint' into gfi-master

* gfi-maint:
  Teach import-tars about GNU tar's @LongLink extension.

contrib/fast-import/import-tars.perl

@@ -52,6 +52,25 @@ foreach my $tar_file (@ARGV)
 			Z8 Z1 Z100 Z6
 			Z2 Z32 Z32 Z8 Z8 Z*', $_;
 		last unless $name;
+		if ($name eq '././@LongLink') {
+			# GNU tar extension
+			if (read(I, $_, 512) != 512) {
+				die ('Short archive');
+			}
+			$name = unpack 'Z257', $_;
+			next unless $name;
+
+			my $dummy;
+			if (read(I, $_, 512) != 512) {
+				die ('Short archive');
+			}
+			($dummy, $mode, $uid, $gid, $size, $mtime,
+			$chksum, $typeflag, $linkname, $magic,
+			$version, $uname, $gname, $devmajor, $devminor,
+			$prefix) = unpack 'Z100 Z8 Z8 Z8 Z12 Z12
+			Z8 Z1 Z100 Z6
+			Z2 Z32 Z32 Z8 Z8 Z*', $_;
+		}
 		next if $name =~ m{/\z};
 		$mode = oct $mode;
 		$size = oct $size;