proposal: Use version info from runtime/debug:BuildInfo when installed by go install

[MakDon]

As #3967 says, if we install gRPC-gateway using go install, then protoc-gen-grpc-gateway --version would outputs Version dev, commit unknown, built at unknown because the build info is not linked during build time.

But i found that golang provides runtime/debug:BuildInfo ,which may helps.

We could use the BuildInfo from it if vsc info is not linked by goreleaser:

	if commit == "unknown" {
		buildInfo, ok := debug.ReadBuildInfo()
		if ok {
			for _, setting := range buildInfo.Settings {
				if setting.Key == "vcs.revision" {
					commit = setting.Value
				}
				if setting.Key == "vcs.time" {
					date = setting.Value
				}
			}
			fmt.Printf("commit %v, built at %v\n", commit, date)
			os.Exit(0)
		}
	}
			

And then check if it works:

➜  grpc-gateway git:(master) ✗ cd ..
➜  dev mkdir tmp
➜  dev 
➜  dev cd tmp 
➜  tmp git clone git@github.com:MakDon/grpc-gateway.git
Cloning into 'grpc-gateway'...
remote: Enumerating objects: 22297, done.
remote: Counting objects: 100% (3444/3444), done.
remote: Compressing objects: 100% (443/443), done.
remote: Total 22297 (delta 3295), reused 3036 (delta 2997), pack-reused 18853
Receiving objects: 100% (22297/22297), 9.03 MiB | 3.20 MiB/s, done.
Resolving deltas: 100% (16799/16799), done.
➜  tmp cd grpc-gateway/protoc-gen-grpc-gateway 
➜  protoc-gen-grpc-gateway git:(master) ls
BUILD.bazel internal    main.go
➜  protoc-gen-grpc-gateway git:(master) go build
➜  protoc-gen-grpc-gateway git:(master) ✗ ./protoc-gen-grpc-gateway --version
commit 09bd9fef8e214eeb8487844d6f25f7f6c1101c22, built at 2024-05-22T17:36:03Z
➜  protoc-gen-grpc-gateway git:(master) ✗

[MakDon]

Found it still not working when installed by go install.

➜  git:(master) go install github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway@cc70731
go: downloading github.com/grpc-ecosystem/grpc-gateway/v2 v2.20.1-0.20240523165541-cc70731f9bd2
➜  git:(master) protoc-gen-grpc-gateway --version                                                   
commit unknown, built at unknown

Would keep trying to solve this issue.

[MakDon]

Close for issue has been solved.

➜ go install github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway@main
go: downloading github.com/grpc-ecosystem/grpc-gateway/v2 v2.20.1-0.20240531172029-a94bb9df9cdf
➜ protoc-gen-grpc-gateway --version
Version v2.20.1-0.20240531172029-a94bb9df9cdf, commit unknown, built at unknown