[英]Bazel select fails inside ctx.file
I am trying to specify build conditions based on the os I'm running bazel from, so in my .bzl script I have a rule that makes all the simlinks from external sources and writes a BUILD file (with ctx.file), in which I'm declaring all the imports and libraries and in those I would like to add the select function. 我试图根据我运行bazel的os来指定构建条件,所以在我的.bzl脚本中我有一个规则,它从外部源创建所有simlink并写入一个BUILD文件(带有ctx.file),其中我正在声明所有的导入和库,在那些我想添加select函数。 However, when I build I get this error message:
但是,当我构建时,我收到此错误消息:
ERROR: no such package '@maya_repo//': Traceback (most recent call last):
File "/var/tmp/doNotRemove/mdilena_plugins/MayaMathNodes/src/maya.bzl", line 149
ctx.file("BUILD", _BUILD_STRUC.format(maya_...))
File "/var/tmp/doNotRemove/mdilena_plugins/MayaMathNodes/src/maya.bzl", line 149, in ctx.file
_BUILD_STRUC.format(maya_dir = maya_dir)
Invalid character '[' inside replacement field
so here's an example of my code and what I'm trying to achieve: 所以这是我的代码和我想要实现的目标的一个例子:
_BUILD_STRUC = \
"""
# Windows imports
cc_import(
name = "Foundation-win",
interface_library = "{maya_dir}/lib/Foundation.lib",
shared_library = "{maya_dir}/bin/Foundation.dll",
)
cc_import(
name = "OpenMaya-win",
interface_library = "{maya_dir}/lib/OpenMaya.lib",
shared_library = "{maya_dir}/bin/OpenMaya.dll",
)
# Linux imports
cc_import(
name = "Foundation-lnx",
shared_library = "{maya_dir}/bin/Foundation.so",
)
cc_import(
name = "OpenMaya-lnx",
shared_library = "{maya_dir}/bin/OpenMaya.so",
)
cc_library(
name = "Foundation",
deps = select({
"@bazel_tools//src/conditions:windows": [":Foundation-win"],
"//conditions:default": [":Foundation-lnx"],
}),
includes = ["{maya_dir}/include"],
visibility = ["//visibility:public"],
)
cc_library(
name = "OpenMaya",
deps = select({
"@bazel_tools//src/conditions:windows": [":OpenMaya-win"],
"//conditions:default": [":OpenMaya-lnx"],
}),
includes = ["{maya_dir}/include"],
visibility = ["//visibility:public"],
)
"""
def _impl(ctx):
maya_src = ctx.os.environ["MAYA_LOCATION"]
maya_ver = ctx.os.environ["MAYA_VERSION"]
maya_dir = "maya{}".format(maya_ver)
ctx.symlink(maya_src, maya_dir)
ctx.file("BUILD", _BUILD_STRUC.format(maya_dir=maya_dir))
link_maya = repository_rule(
implementation = _impl,
local = True,
environ = ["MAYA_LOCATION"],
)
does anyone have any idea why this is happening? 有没有人知道为什么会这样? I looked at select and configurable attributes docs and seems like that's the way to use it;
我查看了选择和可配置属性文档,看起来就像是使用它的方式; I wonder if it's me doing something wrong or if there's a bug somewhere.
我想知道是不是我做错了什么,或者某个地方是否有错误。
Thanks for any help! 谢谢你的帮助!
EDIT:
编辑:
looks like Bazel really doesn't like using select inside a ctx.file, I'll leave the question open in case someone will be able to shed some light on it.
看起来像Bazel真的不喜欢在ctx.file中使用select,我会留下问题以防万一有人能够对它有所了解。 In the meantime I solved it by making all the
cc_imports
and includes public from the linked repo, while leaving all thecc_libraries
withselect
to my plugin's BUILD file;在此期间,我通过制作所有
cc_imports
解决了它,并在链接的repo中包含public,同时将所有cc_libraries
select
为我的插件的BUILD文件; from there I'm able to use the condition and everything builds.从那里我能够使用条件和一切建立。
It looks like the error is coming from this line, specifically the call to string.format
. 看起来错误来自这一行,特别是对
string.format
的调用。
ctx.file("BUILD", _BUILD_STRUC.format(maya_dir=maya_dir))
string.format
searches the template string for curly braces like {}
or {key}
and replaces them with positional or keyword arguments. string.format
在模板字符串中搜索大括号,如{}
或{key}
,并用位置或关键字参数替换它们。
You're seeing this error because string.format
is mistaking the dict argument to select
within the template as something to replace because it starts with a curly brace. 你看到这个错误是因为
string.format
错误地将dict参数误认为是在模板中select
要替换的东西,因为它以大括号开头。 Escaping the braces within the template string by doubling them should fix the problem: 通过加倍模板字符串中的大括号来解决问题:
_BUILD_STRUC = \
"""
...
cc_library(
name = "Foundation",
deps = select({{
"@bazel_tools//src/conditions:windows": [":Foundation-win"],
"//conditions:default": [":Foundation-lnx"],
}}),
includes = ["{maya_dir}/include"],
visibility = ["//visibility:public"],
)
...
FYI, you might find repository_ctx.template
easier to work with. 仅供参考,您可能会发现
repository_ctx.template
更易于使用。 It has slightly different semantics: it replaces strings literally, without looking for special characters like {
, so escaping is not needed. 它的语义略有不同:它可以直接替换字符串,而不需要查找像
{
这样的特殊字符,因此不需要转义。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.