工具链未下载工具
嗨，我正在试着为Fn项目设置一个工具链。方法是为GitHub中可用的每个二进制文件设置一个工具链，然后在理论上在规则中使用它。
我有一个通用的包，其中包含可用的二进制文件：
default_version = "0.5.44"
os_list = [
"linux",
"mac",
"windows"
]
def get_bin_name(os):
return "fn_cli_%s_bin" % os下载部分如下所示：
load(":common.bzl", "get_bin_name", "os_list", "default_version")
_url = "https://github.com/fnproject/cli/releases/download/{version}/{file}"
_os_to_file = {
"linux" : "fn_linux",
"mac" : "fn_mac",
"windows" : "fn.exe",
}
def _fn_binary(os):
name = get_bin_name(os)
file = _os_to_file.get(os)
url = _url.format(
file = file,
version = default_version
)
native.http_file(
name = name,
urls = [url],
executable = True
)
def fn_binaries():
"""
Installs the hermetic binary for Fn.
"""
for os in os_list:
_fn_binary(os)然后我像这样设置工具链：
load(":common.bzl", "get_bin_name", "os_list")
_toolchain_type = "toolchain_type"
FnInfo = provider(
doc = "Information about the Fn Framework CLI.",
fields = {
"bin" : "The Fn Framework binary."
}
)
def _fn_cli_toolchain(ctx):
toolchain_info = platform_common.ToolchainInfo(
fn_info = FnInfo(
bin = ctx.attr.bin
)
)
return [toolchain_info]
fn_toolchain = rule(
implementation = _fn_cli_toolchain,
attrs = {
"bin" : attr.label(mandatory = True)
}
)
def _add_toolchain(os):
toolchain_name = "fn_cli_%s" % os
native_toolchain_name = "fn_cli_%s_toolchain" % os
bin_name = get_bin_name(os)
compatibility = ["@bazel_tools//platforms:%s" % os]
fn_toolchain(
name = toolchain_name,
bin = ":%s" % bin_name,
visibility = ["//visibility:public"]
)
native.toolchain(
name = native_toolchain_name,
toolchain = ":%s" % toolchain_name,
toolchain_type = ":%s" % _toolchain_type,
target_compatible_with = compatibility
)
def setup_toolchains():
"""
Macro te set up the toolchains for the different platforms
"""
native.toolchain_type(name = _toolchain_type)
for os in os_list:
_add_toolchain(os)
def fn_register():
"""
Registers the Fn toolchains.
"""
path = "//tools/bazel_rules/fn/internal/cli:fn_cli_%s_toolchain"
for os in os_list:
native.register_toolchains(path % os)在我的构建文件中，我调用setup_toolchains：
load(":toolchain.bzl", "setup_toolchains")
setup_toolchains()有了这个设置，我有一个规则，看起来像这样：
_toolchain = "//tools/bazel_rules/fn/cli:toolchain_type"
def _fn(ctx):
print("HEY")
bin = ctx.toolchains[_toolchain].fn_info.bin
print(bin)
# TEST RULE
fn = rule(
implementation = _fn,
toolchains = [_toolchain]
)工作空间：
workspace(name = "basicwindow")
load("//tools/bazel_rules/fn:defs.bzl", "fn_binaries", "fn_register")
fn_binaries()
fn_register()当我使用bazel query //tools/bazel_rules/fn/internal/cli:fn_cli_linux_bin查询不同的二进制文件时，它们就在那里，但是调用bazel build //...会导致一个错误，报告如下：
ERROR: /Users/marcguilera/Code/Marc/basicwindow/tools/bazel_rules/fn/internal/cli/BUILD.bazel:2:1: in bin attribute of fn_toolchain rule //tools/bazel_rules/fn/internal/cli:fn_cli_windows: rule '//tools/bazel_rules/fn/internal/cli:fn_cli_windows_bin' does not exist. Since this rule was created by the macro 'setup_toolchains', the error might have been caused by the macro implementation in /Users/marcguilera/Code/Marc/basicwindow/tools/bazel_rules/fn/internal/cli/toolchain.bzl:35:15
ERROR: Analysis of target '//tools/bazel_rules/fn/internal/cli:fn_cli_windows' failed; build aborted: Analysis of target '//tools/bazel_rules/fn/internal/cli:fn_cli_windows' failed; build aborted
INFO: Elapsed time: 0.079s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (0 packages loaded, 0 targets configured)我尝试按照文档中的工具链教程进行操作，但是我不能让它工作。另一个有趣的事情是，我实际上使用的是mac，所以工具链的兼容性似乎也是错误的。
我在一个repo中使用了这个工具链，所以路径会有所不同，但为了便于阅读，here's只包含fn内容的repo。
回答 1
Stack Overflow用户
发布于 2019-02-01 04:22:19
两件事：
第一，我怀疑这就是你的实际问题：https://github.com/bazelbuild/bazel/issues/6828问题的核心是，如果toolchain_type目标在外部存储库中，它总是需要通过完全限定名引用，而不是通过本地限定名引用。
第二个是更基本的:这里有很多Starlark宏，它们生成其他目标，并且很难阅读。实际上，删除很多宏要简单得多，比如_fn_binary、fn_binaries和_add_toolchains。只需让setup_toolchains直接创建所需的native.toolchain目标，并使用一个存储库宏调用http_archive三次来声明三组不同的二进制文件。这将使代码更容易阅读，从而更容易调试。
对于调试工具链，我遵循两个步骤:首先，我验证工具存储库是否存在并且可以直接访问，然后检查工具链的注册和解析。
深入几层之后，看起来您正在调用http_archive，将新存储库命名为@linux，并下载特定的二进制文件。这不是http_archive的工作方式:它需要获取一个压缩文件(或tar.gz文件)，将其解压缩，然后在其中找到一个工作区和至少一个构建文件。
我的建议是:简化宏，明确定义外部存储库，然后探索使用工具链解析来选择正确的存储库。
我很乐意在需要时帮助回答更多的问题。
https://stackoverflow.com/questions/54467249
复制相似问题
腾讯云开发者
