feat: add agent exec pkg (#15577)

agent/agentexec/main_linux_test.go

@@ -0,0 +1,46 @@
+//go:build linux
+// +build linux
+
+package agentexec_test
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"testing"
+)
+
+var TestBin string
+
+func TestMain(m *testing.M) {
+	code := func() int {
+		// We generate a unique directory per test invocation to avoid collisions between two
+		// processes attempting to create the same temp file.
+		dir := genDir()
+		defer os.RemoveAll(dir)
+		TestBin = buildBinary(dir)
+		return m.Run()
+	}()
+
+	os.Exit(code)
+}
+
+func buildBinary(dir string) string {
+	path := filepath.Join(dir, "agent-test")
+	out, err := exec.Command("go", "build", "-o", path, "./cmdtest").CombinedOutput()
+	mustf(err, "build binary: %s", out)
+	return path
+}
+
+func mustf(err error, msg string, args ...any) {
+	if err != nil {
+		panic(fmt.Sprintf(msg, args...))
+	}
+}
+
+func genDir() string {
+	dir, err := os.MkdirTemp(os.TempDir(), "agentexec")
+	mustf(err, "create temp dir: %v", err)
+	return dir
+}