Question

文档说，“ stamp”参数将“启用链接标记”，并将“将构建信息编码为二进制”和“将构建信息压缩为二进制”

但是这些信息实际上在哪里，如何获取呢？

它似乎不是简单的搜索和替换，变量定义，环境变量或格式字符串变量。测试python脚本：

BUILD_HOST="ASDF"
print("{BUILD_HOST}")
print(BUILD_HOST)

构建规则： py_binary(name="catself", srcs=["catself.py"], stamp=1)

输出：

$ bazel run --stamp catself
INFO: Analyzed target //:catself (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
Target //:catself up-to-date:
  bazel-bin/catself
INFO: Elapsed time: 0.083s, Critical Path: 0.01s
INFO: 0 processes.
INFO: Build completed successfully, 1 total action
INFO: Build completed successfully, 1 total action
{BUILD_HOST}
ASDF

Answer 1

看来py_binary可能未启用标记。不过，它应该适用于genrule，因此类似这样的简单事情应该起作用：

py_binary(
  name = "foo",
  srcs = ["foo.py"],
  data = [":stable-status.txt"],
)

genrule(
  name = "copy_stable-status.txt",
  outs = ["stable-status.txt"],
  cmd = "cp bazel-out/stable-status.txt $@",
  stamp = 1,
)

foo.py：

build_info = {}
with open("stable-status.txt") as stable_status:
  for line in stable_status.readlines():
    key, val = line.split(" ", 1)
    build_info[key] = val.strip()
print("Build label is:")
print(build_info['BUILD_EMBED_LABEL'])

然后：

$ bazel run foo --embed_label=foobar
Starting local Bazel server and connecting to it...
INFO: Analyzed target //:foo (17 packages loaded, 102 targets configured).
INFO: Found 1 target...
Target //:foo up-to-date:
  bazel-bin/foo
INFO: Elapsed time: 2.985s, Critical Path: 0.11s
INFO: 1 process: 1 linux-sandbox.
INFO: Build completed successfully, 6 total actions
INFO: Build completed successfully, 6 total actions
Build label is:
foobar

或更喜欢的东西：

py_binary(
  name = "bar",
  srcs = ["bar.py"],
  deps = [":buildinfo"],
)

py_library(
  name = "buildinfo",
  srcs = [":buildinfo.py"],
)

genrule(
  name = "gen_buildinfo",
  outs = ["buildinfo.py"],
  cmd = r"""sed -E 's/(.*) (.*)/\1 = "\2"/' bazel-out/stable-status.txt > $@""",
  stamp = 1,
)

bar.py：

import buildinfo
print("Build label is:")
print(buildinfo.BUILD_EMBED_LABEL)

Bazel的py_binary冲压如何工作？

1 个答案: