cache repository rules

The following functions can be loaded from @bazel_tools//tools/build_defs/repo:cache.bzl.

Returns the default canonical id to use for downloads.

get_default_canonical_id

load(“@bazel//tools/build_defs/repo:cache.bzl”, “get_default_canonical_id”)
get_default_canonical_id(repository_ctx, urls)

Returns the default canonical id to use for downloads.

Returns "" (empty string) when Bazel is run with --repo_env=BAZEL_HTTP_RULES_URLS_AS_DEFAULT_CANONICAL_ID=0.

e.g.

load("@bazel_tools//tools/build_defs/repo:cache.bzl", "get_default_canonical_id")
# ...
    repository_ctx.download_and_extract(
        url = urls,
        integrity = integrity
        canonical_id = get_default_canonical_id(repository_ctx, urls),
    ),

Parameters

repository_ctx	required. The repository context of the repository rule calling this utility function.
urls	required. A list of URLs matching what is passed to repository_ctx.download and repository_ctx.download_and_extract.