From 3a83cf030d6037790f1a57bb224f6bf55054a120 Mon Sep 17 00:00:00 2001
From: Jeff Carr <jcarr@wit.com>
Date: Fri, 13 Dec 2024 17:13:29 -0600
Subject: [PATCH] start skipping repos with tracked go.* files

---
 isTracked.go | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 main.go      | 22 +++++++++++++++++++
 2 files changed, 84 insertions(+)
 create mode 100644 isTracked.go

diff --git a/isTracked.go b/isTracked.go
new file mode 100644
index 0000000..391ecd5
--- /dev/null
+++ b/isTracked.go
@@ -0,0 +1,62 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+
+	"go.wit.com/lib/protobuf/gitpb"
+)
+
+func isTracked(file string) (bool, error) {
+	cmd := exec.Command("git", "ls-files", "--error-unmatch", file)
+	err := cmd.Run()
+	if err == nil {
+		return true, nil
+	}
+	if exitError, ok := err.(*exec.ExitError); ok && exitError.ExitCode() == 1 {
+		return false, nil // File not tracked
+	}
+	return false, fmt.Errorf("error checking tracked status: %v", err)
+}
+
+func isIgnored(file string) (bool, error) {
+	cmd := exec.Command("git", "check-ignore", "-q", file)
+	err := cmd.Run()
+	if err == nil {
+		return true, nil
+	}
+	if exitError, ok := err.(*exec.ExitError); ok && exitError.ExitCode() == 1 {
+		return false, nil // File not ignored
+	}
+	return false, fmt.Errorf("error checking ignored status: %v", err)
+}
+
+func repoOwnsGoMod(repo *gitpb.Repo) (bool, error) {
+	os.Chdir(repo.FullPath)
+	file := "go.mod"
+
+	tracked, err := isTracked(file)
+	if err != nil {
+		fmt.Printf("%s Error checking if tracked: %v\n", repo.GoPath, err)
+		return false, err
+	}
+
+	if tracked {
+		fmt.Printf("%s %s is tracked by Git.\n", repo.GoPath, file)
+		return true, nil
+	}
+
+	ignored, err := isIgnored(file)
+	if err != nil {
+		fmt.Printf("%s Error checking if ignored: %v\n", repo.GoPath, err)
+		return false, err
+	}
+
+	if ignored {
+		fmt.Printf("%s %s is ignored by Git.\n", repo.GoPath, file)
+		return true, nil
+	}
+	fmt.Printf("%s %s is neither tracked nor ignored by Git.\n", repo.GoPath, file)
+	return false, nil
+}
diff --git a/main.go b/main.go
index 8febccd..fb50fa0 100644
--- a/main.go
+++ b/main.go
@@ -131,6 +131,28 @@ func doMain(repo *gitpb.Repo) error {
 		return errors.New(repo.GoPath + " not in the git master branch")
 	}
 
+	ok, err := repoOwnsGoMod(repo)
+	if err != nil {
+		return err
+	}
+	// if ok, then git owns 'go.mod' and we can't really do anything
+	// todo: ignore this with --force
+	if ok {
+		return nil
+	} else {
+		if forge.Config.IsReadOnly(repo.GoPath) {
+			log.Info("skipping read only", repo.GoPath)
+			return nil
+		}
+	}
+
+	if repo.CheckDirty() {
+		log.Info("")
+		log.Info("You can not run this on dirty branches.")
+		log.Info("")
+		return errors.New(repo.GoPath + " git repo is dirty")
+	}
+
 	// re-create go.sum and go.mod
 	if err := redoGoMod(repo); err != nil {
 		return err