Repository: go
Issue: x/tools/gopls: detect tools.go files, and suppress warning
Labels: help wanted,gopls,Tools,gopls/analysis

I've been looking for a way to fix this for quite a bit of time and nothing I've tried has worked. I'm using `oapi-codegen` to generate boilerplate for my webserver. The authors of this library recommend the [tools.go](https://www.jvt.me/posts/2022/06/15/go-tools-dependency-management/) pattern for managing the dependency, so that `go.mod` can act as the single source of truth for versioning. For transparency, their readme recommends this [here](https://github.com/oapi-codegen/oapi-codegen/tree/main?tab=readme-ov-file#install). Doing this actually works -- I can run `go generate` just fine and my code builds. However, VSCode insists on showing an error and warning in this tools.go file, marking the file and the module folder red:

![image](https://github.com/user-attachments/assets/6f7b16e5-11eb-46d7-bffe-f0e9836bd1bb)

This is driving me crazy. I'd like to at least suppress these, but I can't find any way to do so. I've tried using the `lintFlags` to exclude it, but it appears to be `gopls` and not `staticcheck`, so this doesn't do anything. I can't find a `gopls` configuration setting that will allow me to ignore this file or any issues with it, either.

For what it's worth, someone else noticed the same thing with a different library in [this](https://github.com/grpc-ecosystem/grpc-gateway/issues/3515) issue.

### What version of Go, VS Code & VS Code Go extension are you using?
<details><summary>Version Information</summary><br>

* Run `go version` to get version of Go from _the VS Code integrated terminal_.
	- go version go1.22.5 darwin/arm64
* Run `gopls -v version` to get version of Gopls from _the VS Code integrated terminal_.
	- golang.org/x/tools/gopls v0.16.1
* Run `code -v` or `code-insiders -v` to get version of VS Code or VS Code Insiders.
	- Version: 1.92.1
* Check your installed extensions to get the version of the VS Code Go extension
	- v0.42.0
* Run Ctrl+Shift+P (Cmd+Shift+P on Mac OS) > `Go: Locate Configured Go Tools` command.
```
# Tools Configuration


## Environment

GOBIN: undefined
toolsGopath: 
gopath: /Users/[username]/go
GOROOT: /opt/homebrew/Cellar/go/1.22.5/libexec
PATH: /opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Users/[username]/Library/Application Support/JetBrains/Toolbox/scripts:/Users/[username]/go/bin

## Tools

	go:	/opt/homebrew/bin/go: go version go1.22.5 darwin/arm64

	gopls:	/Users/[username]/go/bin/gopls	(version: v0.16.1 built with go: go1.22.5)
	gotests:	not installed
	gomodifytags:	not installed
	impl:	not installed
	goplay:	not installed
	dlv:	/Users/[username]/go/bin/dlv	(version: v1.23.0 built with go: go1.22.5)
	staticcheck:	/Users/[username]/go/bin/staticcheck	(version: v0.4.7 built with go: go1.22.5)

## Go env

Workspace Folder (point-system): /Users/[username]/Documents/Repositories/point-system

	GO111MODULE=''
	GOARCH='arm64'
	GOBIN=''
	GOCACHE='/Users/[username]/Library/Caches/go-build'
	GOENV='/Users/[username]/Library/Application Support/go/env'
	GOEXE=''
	GOEXPERIMENT=''
	GOFLAGS=''
	GOHOSTARCH='arm64'
	GOHOSTOS='darwin'
	GOINSECURE=''
	GOMODCACHE='/Users/[username]/go/pkg/mod'
	GONOPROXY=''
	GONOSUMDB=''
	GOOS='darwin'
	GOPATH='/Users/[username]/go'
	GOPRIVATE=''
	GOPROXY='https://proxy.golang.org,direct'
	GOROOT='/opt/homebrew/Cellar/go/1.22.5/libexec'
	GOSUMDB='sum.golang.org'
	GOTMPDIR=''
	GOTOOLCHAIN='auto'
	GOTOOLDIR='/opt/homebrew/Cellar/go/1.22.5/libexec/pkg/tool/darwin_arm64'
	GOVCS=''
	GOVERSION='go1.22.5'
	GCCGO='gccgo'
	AR='ar'
	CC='cc'
	CXX='c++'
	CGO_ENABLED='1'
	GOMOD='/dev/null'
	GOWORK=''
	CGO_CFLAGS='-O2 -g'
	CGO_CPPFLAGS=''
	CGO_CXXFLAGS='-O2 -g'
	CGO_FFLAGS='-O2 -g'
	CGO_LDFLAGS='-O2 -g'
	PKG_CONFIG='pkg-config'
	GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/by/cxzl4qc57c3c8dd9p9snhn680000gn/T/go-build3419525479=/tmp/go-build -gno-record-gcc-switches -fno-common'
```
</details>

### Share the Go related settings you have added/edited

```json
{
    "go.lintTool": "staticcheck",
    "go.lintFlags": [
        "-exclude=gateway/tools/tools.go"
    ]
}
```