From 5a33e5bf2711e7fb563240d10103e889a85efc9a Mon Sep 17 00:00:00 2001
From: Amolith <amolith@secluded.site>
Date: Fri, 24 Jul 2026 21:57:29 -0600
Subject: [PATCH] gitutil: isolate tests from user Git config

Git integration tests inherited global and system configuration, allowing
host settings such as commit signing to change their behavior.

Ignore external Git configuration for the package test process while
retaining repository-local configuration created by each fixture.
---
 internal/gitutil/checkout_test.go | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/internal/gitutil/checkout_test.go b/internal/gitutil/checkout_test.go
index f4f145a..d0edefa 100644
--- a/internal/gitutil/checkout_test.go
+++ b/internal/gitutil/checkout_test.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"compress/gzip"
 	"context"
+	"fmt"
 	"io"
 	"os"
 	"os/exec"
@@ -12,6 +13,34 @@ import (
 	"testing"
 )
 
+func TestMain(m *testing.M) {
+	for _, variable := range []string{
+		"GIT_CONFIG",
+		"GIT_CONFIG_PARAMETERS",
+		"GIT_CONFIG_SYSTEM",
+	} {
+		if err := os.Unsetenv(variable); err != nil {
+			panic(fmt.Errorf("unset %s: %w", variable, err))
+		}
+	}
+
+	settings := []struct {
+		name  string
+		value string
+	}{
+		{name: "GIT_CONFIG_COUNT", value: "0"},
+		{name: "GIT_CONFIG_GLOBAL", value: os.DevNull},
+		{name: "GIT_CONFIG_NOSYSTEM", value: "1"},
+	}
+	for _, setting := range settings {
+		if err := os.Setenv(setting.name, setting.value); err != nil {
+			panic(fmt.Errorf("set %s: %w", setting.name, err))
+		}
+	}
+
+	os.Exit(m.Run())
+}
+
 func TestGenerateAndCheckoutPatch(t *testing.T) {
 	ctx := context.Background()
 	tempDir := t.TempDir()
-- 
2.51.2