我正在制定我的第一个自定义Bazel规则。规则允许运行bats
命令行测试。
我在逐字下面列出了规则定义。到目前为止我对它很满意,但有一部分感觉非常丑陋和非标准。如果规则用户向规则添加二进制依赖项,那么我确保二进制文件出现在PATH
上,以便可以对其进行测试。目前,我通过制作二进制路径列表,然后将$PWD
附加到脚本中,并在脚本内部扩展到完整的执行路径。这感觉很容易出错并容易出错。
有更惯用的方法吗?我不相信我可以访问规则中的执行路径,因为它直到执行阶段才被创建。
感谢您的帮助!
BATS_REPOSITORY_BUILD_FILE = """
package(default_visibility = [ "//visibility:public" ])
sh_binary(
name = "bats",
srcs = ["libexec/bats"],
data = [
"libexec/bats-exec-suite",
"libexec/bats-exec-test",
"libexec/bats-format-tap-stream",
"libexec/bats-preprocess",
],
)
"""
def bats_repositories(version="v0.4.0"):
native.new_git_repository(
name = "bats",
remote = "https://github.com/sstephenson/bats",
tag = version,
build_file_content = BATS_REPOSITORY_BUILD_FILE
)
BASH_TEMPLATE = """
#!/usr/bin/env bash
set -e
export TMPDIR="$TEST_TMPDIR"
export PATH="{bats_bins_path}":$PATH
"{bats}" "{test_paths}"
"""
def _dirname(path):
prefix, _, _ = path.rpartition("/")
return prefix.rstrip("/")
def _bats_test_impl(ctx):
runfiles = ctx.runfiles(
files = ctx.files.srcs,
collect_data = True,
)
tests = [f.short_path for f in ctx.files.srcs]
path = ["$PWD/" + _dirname(b.short_path) for b in ctx.files.deps]
sep = ctx.configuration.host_path_separator
ctx.file_action(
output = ctx.outputs.executable,
executable = True,
content = BASH_TEMPLATE.format(
bats = ctx.executable._bats.short_path,
test_paths = " ".join(tests),
bats_bins_path = sep.join(path),
),
)
runfiles = runfiles.merge(ctx.attr._bats.default_runfiles)
return DefaultInfo(
runfiles = runfiles,
)
bats_test = rule(
attrs = {
"srcs": attr.label_list(
allow_files = True,
),
"deps": attr.label_list(),
"_bats": attr.label(
default = Label("@bats//:bats"),
executable = True,
cfg = "host",
),
},
test = True,
implementation = _bats_test_impl,
)
答案 0 :(得分:4)
Bazel 0.8.0应该很容易支持,这将在约2周内发布
在你的skylark实现中,你应该ctx.expand_location(binary)
,其中binary
应该是$(execpath :some-label)
,这样你可能只需要使用$(execpath)
和bazel格式化用户的标签将确保为您提供该标签的执行位置。
一些相关资源:
$location expansion in Bazel
https://github.com/bazelbuild/bazel/issues/2475
https://github.com/bazelbuild/bazel/commit/cff0dc94f6a8e16492adf54c88d0b26abe903d4c