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build / config / siso / ar.star [blame]
# -*- bazel-starlark -*-
# Copyright 2024 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Siso configuration for ar."""
load("@builtin//path.star", "path")
load("@builtin//struct.star", "module")
# https://en.wikipedia.org/wiki/Ar_(Unix)
def __file_header(fname, size):
fid = fname + " " * 16
header = fid[:16]
if fname == "//":
header += " " * 12 # file modification timestamp
header += " " * 6 # owner id
header += " " * 6 # group id
header += " " * 8 # file mode
else:
header += "0" + " " * 11 # file modification timestamp
header += "0" + " " * 5 # owner id
header += "0" + " " * 5 # group id
header += "644" + " " * 5 # file mode
s = ("%d" % size) + " " * 10
header += s[:10] # file size
header += "\x60\n" # header trailer string
return header
def __ref_fname(offset, fname):
i = offset[fname]
return "/%d" % i
def __padding(data):
if len(data) % 2 == 0:
return data
return data + "\n"
def __ar_create(ctx, wd, ins):
data = "!<thin>\n"
offset = {}
content = ""
for fname in ins:
offset[fname] = len(content)
content += path.rel(wd, fname) + "/\n"
content = __padding(content)
data += __file_header("//", len(content))
data += content
for fname in ins:
size = ctx.fs.size(fname)
if size:
data += __file_header(__ref_fname(offset, fname), size)
return bytes(data)
ar = module(
"ar",
create = __ar_create,
)