mirror of
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58 lines
2.0 KiB
Python
58 lines
2.0 KiB
Python
# Copyright 2018 The Kubernetes Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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prefix = "https://storage.googleapis.com/k8s-bazel-cache/"
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def mirror(url):
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"""Try downloading a URL from a GCS mirror first, then from the original.
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Update the GCS bucket using bazel run //hack:update-mirror"""
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return [prefix + url, url]
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def mirror_urls():
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# This function only gives proper results when executed from WORKSPACE,
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# but the data is needed in sh_binary, which can only be in a BUILD file.
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# Thus, it is be exported by a repository_rule (which executes in WORKSPACE)
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# to be used by the sh_binary.
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urls = []
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for k, v in native.existing_rules().items():
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us = list(v.get("urls", []))
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if "url" in v:
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us.append(v["url"])
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for u in us:
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if u and not u.startswith(prefix):
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urls.append(u)
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return sorted(urls)
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def export_urls_impl(repo_ctx):
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repo_ctx.file(repo_ctx.path("BUILD.bazel"), """
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exports_files(glob(["**"]), visibility=["//visibility:public"])
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""")
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repo_ctx.file(
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repo_ctx.path("urls.txt"),
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# Add a trailing newline, since the "while read" loop needs it
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content = ("\n".join(repo_ctx.attr.urls) + "\n"),
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)
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_export_urls = repository_rule(
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attrs = {
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"urls": attr.string_list(mandatory = True),
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},
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local = True,
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implementation = export_urls_impl,
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)
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def export_urls(name):
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return _export_urls(name = name, urls = mirror_urls())
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