serveSourcesTar

pub fn serveSourcesTar(fuzz: *Fuzz, req: *std.http.Server.Request) !void {
    const gpa = fuzz.ws.gpa;

    var arena_state: std.heap.ArenaAllocator = .init(gpa);
    defer arena_state.deinit();
    const arena = arena_state.allocator();

    const DedupTable = std.ArrayHashMapUnmanaged(Build.Cache.Path, void, Build.Cache.Path.TableAdapter, false);
    var dedup_table: DedupTable = .empty;
    defer dedup_table.deinit(gpa);

    for (fuzz.run_steps) |run_step| {
        const compile_inputs = run_step.producer.?.step.inputs.table;
        for (compile_inputs.keys(), compile_inputs.values()) |dir_path, *file_list| {
            try dedup_table.ensureUnusedCapacity(gpa, file_list.items.len);
            for (file_list.items) |sub_path| {
                if (!std.mem.endsWith(u8, sub_path, ".zig")) continue;
                const joined_path = try dir_path.join(arena, sub_path);
                dedup_table.putAssumeCapacity(joined_path, {});
            }
        }
    }

    const deduped_paths = dedup_table.keys();
    const SortContext = struct {
        pub fn lessThan(this: @This(), lhs: Build.Cache.Path, rhs: Build.Cache.Path) bool {
            _ = this;
            return switch (std.mem.order(u8, lhs.root_dir.path orelse ".", rhs.root_dir.path orelse ".")) {
                .lt => true,
                .gt => false,
                .eq => std.mem.lessThan(u8, lhs.sub_path, rhs.sub_path),
            };
        }
    };
    std.mem.sortUnstable(Build.Cache.Path, deduped_paths, SortContext{}, SortContext.lessThan);
    return fuzz.ws.serveTarFile(req, deduped_paths);
}