Add profile loading and process execution

internal/process/process_test.go

@@ -0,0 +1,145 @@
+package process
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestRunPassesArgumentsDirectoryAndEnvironment(t *testing.T) {
+	workdir := filepath.Join(t.TempDir(), "directory with spaces")
+	if err := os.Mkdir(workdir, 0o700); err != nil {
+		t.Fatal(err)
+	}
+	t.Setenv("RELEASEKIT_PROCESS_OVERLAY", "parent")
+	t.Setenv("RELEASEKIT_PROCESS_INHERITED", "inherited")
+
+	var stdout, stderr bytes.Buffer
+	err := Run(context.Background(), Invocation{
+		Args: []string{helperExecutable(t), "-test.run=TestProcessHelper", "--", "argument with spaces", "success"},
+		Dir:  workdir,
+		Env: map[string]string{
+			"RELEASEKIT_PROCESS_HELPER":  "1",
+			"RELEASEKIT_PROCESS_OVERLAY": "child",
+		},
+		Stdout: &stdout,
+		Stderr: &stderr,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := fmt.Sprintf("%s|argument with spaces|child|inherited", workdir)
+	if stdout.String() != want {
+		t.Fatalf("stdout = %q, want %q", stdout.String(), want)
+	}
+	if stderr.String() != "child stderr\n" {
+		t.Fatalf("stderr = %q, want %q", stderr.String(), "child stderr\n")
+	}
+	if got := os.Getenv("RELEASEKIT_PROCESS_OVERLAY"); got != "parent" {
+		t.Fatalf("parent environment changed: got %q, want %q", got, "parent")
+	}
+}
+
+func TestRunPreservesExitError(t *testing.T) {
+	err := Run(context.Background(), Invocation{
+		Args: []string{helperExecutable(t), "-test.run=TestProcessHelper", "--", "unused", "exit"},
+		Env:  map[string]string{"RELEASEKIT_PROCESS_HELPER": "1"},
+	})
+	var exitErr *exec.ExitError
+	if !errors.As(err, &exitErr) || exitErr.ExitCode() != 7 {
+		t.Fatalf("Run() error = %v, want exit code 7", err)
+	}
+}
+
+func TestRunReportsMissingExecutable(t *testing.T) {
+	err := Run(context.Background(), Invocation{Args: []string{"releasekit-command-that-does-not-exist"}})
+	if err == nil || !strings.Contains(err.Error(), "releasekit-command-that-does-not-exist") {
+		t.Fatalf("Run() error = %v, want missing executable diagnostic", err)
+	}
+}
+
+func TestRunReturnsCancellation(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	started := make(chan struct{}, 1)
+	invocation := Invocation{
+		Args: []string{helperExecutable(t), "-test.run=TestProcessHelper", "--", "unused", "wait"},
+		Env:  map[string]string{"RELEASEKIT_PROCESS_HELPER": "1"},
+		Stdout: writerFunc(func([]byte) (int, error) {
+			select {
+			case started <- struct{}{}:
+			default:
+			}
+			return len("started\n"), nil
+		}),
+	}
+
+	result := make(chan error, 1)
+	go func() { result <- Run(ctx, invocation) }()
+	select {
+	case <-started:
+		cancel()
+	case <-time.After(5 * time.Second):
+		t.Fatal("child did not start")
+	}
+	select {
+	case err := <-result:
+		if !errors.Is(err, context.Canceled) {
+			t.Fatalf("Run() error = %v, want context cancellation", err)
+		}
+	case <-time.After(5 * time.Second):
+		t.Fatal("Run() did not return after cancellation")
+	}
+}
+
+func TestProcessHelper(t *testing.T) {
+	if os.Getenv("RELEASEKIT_PROCESS_HELPER") != "1" {
+		return
+	}
+	args := os.Args
+	if len(args) < 2 {
+		os.Exit(8)
+	}
+	mode := args[len(args)-1]
+	switch mode {
+	case "success":
+		workdir, err := os.Getwd()
+		if err != nil {
+			os.Exit(9)
+		}
+		fmt.Fprintf(os.Stdout, "%s|%s|%s|%s", workdir, args[len(args)-2], os.Getenv("RELEASEKIT_PROCESS_OVERLAY"), os.Getenv("RELEASEKIT_PROCESS_INHERITED"))
+		fmt.Fprintln(os.Stderr, "child stderr")
+		os.Exit(0)
+	case "exit":
+		os.Exit(7)
+	case "wait":
+		fmt.Fprintln(os.Stdout, "started")
+		for {
+			time.Sleep(time.Second)
+		}
+	default:
+		os.Exit(10)
+	}
+}
+
+type writerFunc func([]byte) (int, error)
+
+func (write writerFunc) Write(p []byte) (int, error) {
+	return write(p)
+}
+
+func helperExecutable(t *testing.T) string {
+	t.Helper()
+	executable, err := os.Executable()
+	if err != nil {
+		t.Fatal(err)
+	}
+	return executable
+}