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Allow for custom coursier download url via COURSIER_URL env var #402

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Apr 12, 2020
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Allow for custom coursier download url via COURSIER_URL env var #402

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8d448f3
Allow for custom coursier download url
wisechengyi Apr 11, 2020
3ad15f9
add readme
wisechengyi Apr 12, 2020
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12 changes: 12 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -368,6 +368,18 @@ The default value of `use_unsafe_shared_cache` is `False`. This means that Bazel
will create independent caches for each `maven_install` repository, located at
`$(bazel info output_base)/external/@<repository_name>/v1`.

### Using a custom Coursier download url

By default bazel bootstraps Coursier via [the urls specificed in versions.bzl](private/versions.bzl).
However in case they are not directly accessible in your environment, you can also specify a custom
url to download Coursier. For example:

```
$ bazel build @maven_with_unsafe_shared_cache//... --repo_env=COURSIER_URL='https://my_secret_host.com/vXYZ/coursier.jar'
```

Please note it still requires the SHA to match.

### `artifact` helper macro

The `artifact` macro translates the artifact's `group:artifact` coordinates to
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11 changes: 9 additions & 2 deletions coursier.bzl
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Expand Up @@ -568,10 +568,16 @@ def _coursier_fetch_impl(repository_ctx):
# caches and uses Coursier's own download mechanisms.

# Download Coursier's standalone (deploy) jar from Maven repositories.
repository_ctx.download([
coursier_download_urls = [
COURSIER_CLI_GITHUB_ASSET_URL,
COURSIER_CLI_BAZEL_MIRROR_URL,
], "coursier", sha256 = COURSIER_CLI_SHA256, executable = True)
]

coursier_url_from_env = repository_ctx.os.environ.get("COURSIER_URL")
if coursier_url_from_env != None:
coursier_download_urls.append(coursier_url_from_env)

repository_ctx.download(coursier_download_urls, "coursier", sha256 = COURSIER_CLI_SHA256, executable = True)

# Try running coursier once
exec_result = repository_ctx.execute(
Expand Down Expand Up @@ -936,6 +942,7 @@ coursier_fetch = repository_rule(
"no_proxy",
"NO_PROXY",
"COURSIER_CACHE",
"COURSIER_URL",
],
implementation = _coursier_fetch_impl,
)