1# -*- bazel-starlark -*- 2# Copyright 2024 The Chromium Authors 3# Use of this source code is governed by a BSD-style license that can be 4# found in the LICENSE file. 5"""Siso configuration for ar.""" 6 7load("@builtin//path.star", "path") 8load("@builtin//struct.star", "module") 9 10# https://en.wikipedia.org/wiki/Ar_(Unix) 11 12def __file_header(fname, size): 13 fid = fname + " " * 16 14 header = fid[:16] 15 if fname == "//": 16 header += " " * 12 # file modification timestamp 17 header += " " * 6 # owner id 18 header += " " * 6 # group id 19 header += " " * 8 # file mode 20 else: 21 header += "0" + " " * 11 # file modification timestamp 22 header += "0" + " " * 5 # owner id 23 header += "0" + " " * 5 # group id 24 header += "644" + " " * 5 # file mode 25 s = ("%d" % size) + " " * 10 26 header += s[:10] # file size 27 header += "\x60\n" # header trailer string 28 return header 29 30def __ref_fname(offset, fname): 31 i = offset[fname] 32 return "/%d" % i 33 34def __padding(data): 35 if len(data) % 2 == 0: 36 return data 37 return data + "\n" 38 39def __ar_create(ctx, wd, ins): 40 data = "!<thin>\n" 41 offset = {} 42 content = "" 43 for fname in ins: 44 offset[fname] = len(content) 45 content += path.rel(wd, fname) + "/\n" 46 content = __padding(content) 47 data += __file_header("//", len(content)) 48 data += content 49 for fname in ins: 50 size = ctx.fs.size(fname) 51 if size: 52 data += __file_header(__ref_fname(offset, fname), size) 53 return bytes(data) 54 55ar = module( 56 "ar", 57 create = __ar_create, 58) 59