tools: Avoid picking protoc file randomly

[sayboras]

Description

This is to make sure that we don't rely on import statement and generate the files in unintended directory.

For example, dummy import in bpf.proto, followed by make codegen will generate files into google/protobuf instead of tetragon dir

diff --git i/api/v1/tetragon/bpf.proto w/api/v1/tetragon/bpf.proto
index 486c4ed32..08629fac3 100644
--- i/api/v1/tetragon/bpf.proto
+++ w/api/v1/tetragon/bpf.proto
@@ -5,6 +5,8 @@ syntax = "proto3";
 
 package tetragon;
 
+import "google/protobuf/duration.proto";
+
 option go_package = "github.com/cilium/tetragon/api/v1/tetragon";
 
 enum BpfCmd {

$  make protogen
... 
...
buf generate 
time="2025-06-12T03:27:25Z" level=info msg=google/protobuf/codegen/helpers/helpers.pb.go
time="2025-06-12T03:27:25Z" level=info msg=google/protobuf/codegen/eventchecker/eventchecker.pb.go
time="2025-06-12T03:27:25Z" level=info msg=google/protobuf/codegen/eventchecker/yaml/yaml.pb.go
time="2025-06-12T03:27:25Z" level=info msg=google/protobuf/types.pb.go
...

$ git status              
...
Untracked files:
  (use "git add <file>..." to include in what will be committed)
        api/v1/google/

With this patch, I can see the generated files are in the correct directory

$ make protogen
...
time="2025-06-12T03:56:29Z" level=info msg=tetragon/codegen/helpers/helpers.pb.go
time="2025-06-12T03:56:29Z" level=info msg=tetragon/codegen/eventchecker/eventchecker.pb.go
time="2025-06-12T03:56:29Z" level=info msg=tetragon/codegen/eventchecker/yaml/yaml.pb.go
time="2025-06-12T03:56:29Z" level=info msg=tetragon/types.pb.go
...

Changelog

tools: Avoid picking protoc file randomly

[kkourt]

Thanks!

Greatly appreciate the nice description in the PR. Could you also add it (or at least a summary of it) in the commit message as well?

[sayboras]

Greatly appreciate the nice description in the PR. Could you also add it (or at least a summary of it) in the commit message as well?

Sure 👍