Allow plugins located on github.com and GHES to be installed at once as an authenticated request
wata727 opened this issue · comments
Introduction
TFLint plugins are primarily intended to be hosted on github.com and is installed using the GitHub API.
Currently, we support authenticated requests with GITHUB_TOKEN
for the following purposes:
- Avoid rate limits
- Install from private repositories
Apart from this, plugins can also be hosted on GitHub Enterprise Server (GHES). See #1751
The problem is that since both github.com and GHES use the same GITHUB_TOKEN
, there is no way to install a plugin hosted on both at once as an authenticated request. See also #2004
Proposal
Add access_token_env
as an attribute of the plugin
block.
plugin "custom" {
source = "github.example.com/example/tflint-ruleset-example"
version = "0.1.0"
enabled = true
access_token_env = "GITHUB_ENT_TOKEN"
}
Plugins with access_token_env
set refer to the declared environment variable instead of GITHUB_TOKEN
when sending authenticated requests. We'll probably need to change the code below:
Lines 253 to 259 in 9bad280
Perhaps this is a minimal change, but I'm still not sure if this is the ideal interface. We may need to extend the source
attribute to object, or new concepts like the connection
block, or an authentication mechanism other than environment variables.
EDIT: @bendrucker suggests a way to provide per-host environment variables like TFE #2005 (comment). I prefer this suggestion as it is better than extending the existing syntax.
We may be able to use something like terraform-svchost to normalize hostnames.
https://github.com/hashicorp/terraform/blob/v1.5.7/internal/command/cliconfig/credentials.go#L120
References
Adding configuration to the plugin block creates a need for repetition and an opportunity for divergence. The real use case here is to provide different tokens per plugin host, not necessarily per plugin.
Terraform does this with environment variables where the variable name is suffixed with the domain, with .
replaced with _
.
https://developer.hashicorp.com/terraform/cli/config/config-file#environment-variable-credentials
This should work here without having to touch any interfaces. If an env var isn't set for GITHUB_TOKEN_${sanitized_host}
then it can fall back to plain GITHUB_TOKEN
. So for example GITHUB_TOKEN_github_com
would be equivalent to setting GITHUB_TOKEN
for github.com users.
Great suggestion. I was going to look up how other services solved similar issues, but I couldn't find it, so thank you for your help.
I also think it's better to be able to set per-host environment variables than to extend the existing syntax.