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fix(builtin): gracefully handle the case of empty yarn_urls #2619

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Apr 22, 2021
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fix(builtin): gracefully handle the case of empty yarn_urls #2619

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13 changes: 12 additions & 1 deletion internal/node/node_repositories.bzl
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Original file line number Diff line number Diff line change
Expand Up @@ -115,6 +115,8 @@ node_repositories(
Will download yarn from https://github.com/yarnpkg/yarn/releases/download/v1.2.1/yarn-v1.12.1.tar.gz
and expect the file to have sha256sum `09bea8f4ec41e9079fa03093d3b2db7ac5c5331852236d63815f8df42b3ba88d`.

If you don't use Yarn at all, you can skip downloading it by setting `yarn_urls = []`.

### Using a local version

To avoid downloads, you can check in vendored copies of NodeJS and/or Yarn and set vendored_node and or vendored_yarn
Expand Down Expand Up @@ -220,6 +222,8 @@ By default, if this attribute has no items, we'll use a list of all public NodeJ
doc = """custom list of URLs to use to download Yarn

Each entry is a template, similar to the `node_urls` attribute, using `yarn_version` and `yarn_repositories` in the substitutions.

If this list is empty, we won't download yarn at all.
""",
),
"yarn_version": attr.string(
Expand Down Expand Up @@ -313,6 +317,14 @@ def _download_yarn(repository_ctx):
Args:
repository_ctx: The repository rule context
"""
yarn_urls = repository_ctx.attr.yarn_urls

# If there are no URLs to download yarn, skip the download
if not len(yarn_urls):
repository_ctx.file("yarn_info", content = "# no yarn urls")
return

# If yarn is vendored locally, we still need the info file but can skip downloading
if repository_ctx.attr.vendored_yarn:
repository_ctx.file("yarn_info", content = "# vendored_yarn: {vendored_yarn}".format(
vendored_yarn = repository_ctx.attr.vendored_yarn,
Expand All @@ -326,7 +338,6 @@ def _download_yarn(repository_ctx):
# The size of _YARN_VERSIONS constant is huge and not useful to document.
if not yarn_repositories.items():
yarn_repositories = _YARN_VERSIONS
yarn_urls = repository_ctx.attr.yarn_urls

if yarn_version in yarn_repositories:
filename, strip_prefix, sha256 = yarn_repositories[yarn_version]
Expand Down