Add runtime version reporting

buildinfo/version_integration_test.go

@@ -0,0 +1,81 @@
+package buildinfo_test
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"testing"
+
+	"gitea.maximumdirect.net/eric/ReleaseKit/internal/versioncontract"
+)
+
+func TestVersionInConsumerExecutable(t *testing.T) {
+	repo, err := filepath.Abs("..")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dir := t.TempDir()
+	module := fmt.Sprintf(`module example.com/versionfixture
+
+go 1.25.0
+
+require gitea.maximumdirect.net/eric/ReleaseKit v0.0.0
+
+replace gitea.maximumdirect.net/eric/ReleaseKit => %s
+`, filepath.ToSlash(repo))
+	if err := os.WriteFile(filepath.Join(dir, "go.mod"), []byte(module), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	program := `package main
+
+import (
+	"fmt"
+	"gitea.maximumdirect.net/eric/ReleaseKit/buildinfo"
+)
+
+func main() { fmt.Print(buildinfo.Version()) }
+`
+	if err := os.WriteFile(filepath.Join(dir, "main.go"), []byte(program), 0o600); err != nil {
+		t.Fatal(err)
+	}
+
+	for _, test := range []struct {
+		name       string
+		linkerArgs []string
+		want       string
+	}{
+		{name: "development build", want: "dev"},
+		{
+			name:       "injected release version",
+			linkerArgs: []string{"-X", versioncontract.InjectedVersionLinkerSymbol + "=v1.2.3"},
+			want:       "v1.2.3",
+		},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			binary := filepath.Join(t.TempDir(), "versionfixture")
+			args := []string{"build", "-o", binary}
+			if len(test.linkerArgs) > 0 {
+				args = append(args, "-ldflags", fmt.Sprint(test.linkerArgs[0], " ", test.linkerArgs[1]))
+			}
+			args = append(args, ".")
+
+			build := exec.Command("go", args...)
+			build.Dir = dir
+			build.Env = append(os.Environ(), "GOTOOLCHAIN=local", "GOPROXY=off", "GOSUMDB=off")
+			if output, err := build.CombinedOutput(); err != nil {
+				t.Fatalf("build consumer fixture: %v\n%s", err, output)
+			}
+
+			command := exec.Command(binary)
+			output, err := command.CombinedOutput()
+			if err != nil {
+				t.Fatalf("run consumer fixture: %v\n%s", err, output)
+			}
+			if string(output) != test.want {
+				t.Fatalf("version output = %q, want %q", output, test.want)
+			}
+		})
+	}
+}