feat(01-01): generate and build hello app from manifest
- Add summer build with validated summer.yaml codegen - Generate stable main.go and plugins.gen.go then go build - Smoke-test the built hello binary greeter:hello command
This commit is contained in:
Jakub Zych
33
cmd/summer/main.go
Normal file
33
cmd/summer/main.go
Normal file
@@ -0,0 +1,33 @@
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package main
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import (
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"context"
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"fmt"
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"os"
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"git.golem15.com/golem15/summercms/bonfire"
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"git.golem15.com/golem15/summercms/internal/build"
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)
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func main() {
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root := bonfire.NewRoot("summer", []bonfire.Command{buildCommand()}, os.Stdout)
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root.SetArgs(os.Args[1:])
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if err := root.Execute(); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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}
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func buildCommand() bonfire.Command {
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return bonfire.Command{
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Name: "build",
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Description: "Generate plugin imports and build the app binary",
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Run: func(ctx context.Context, in bonfire.Input, out bonfire.Output) error {
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dir, err := os.Getwd()
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if err != nil {
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return err
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}
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return build.App(ctx, dir, out)
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},
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}
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}
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41
cmd/summer/main_test.go
Normal file
41
cmd/summer/main_test.go
Normal file
@@ -0,0 +1,41 @@
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package main
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import (
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"go/parser"
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"go/token"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"testing"
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)
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func TestToolDoesNotImportExamplePlugins(t *testing.T) {
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roots := []string{".", filepath.Join("..", "..", "internal", "build")}
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fset := token.NewFileSet()
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for _, root := range roots {
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entries, err := os.ReadDir(root)
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if err != nil {
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t.Fatal(err)
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}
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for _, entry := range entries {
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name := entry.Name()
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if entry.IsDir() || !strings.HasSuffix(name, ".go") {
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continue
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}
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file, err := parser.ParseFile(fset, filepath.Join(root, name), nil, parser.ImportsOnly)
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if err != nil {
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t.Fatal(err)
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}
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for _, spec := range file.Imports {
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path, err := strconv.Unquote(spec.Path.Value)
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if err != nil {
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t.Fatal(err)
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}
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if strings.Contains(path, "examples/hello") {
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t.Fatalf("%s imports %s", name, path)
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}
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}
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}
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}
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}
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@@ -2,6 +2,9 @@ package main
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import (
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"bytes"
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"crypto/sha256"
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"os"
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"os/exec"
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"strings"
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"testing"
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)
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@@ -15,3 +18,46 @@ func TestGreeterHelloPrintsAppName(t *testing.T) {
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t.Fatalf("output = %q, want %q", got, "hello-app")
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}
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}
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func TestBuiltBinaryGreeterHello(t *testing.T) {
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first := runSummerBuild(t)
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h1 := generatedHash(t)
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second := runSummerBuild(t)
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h2 := generatedHash(t)
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if h1 != h2 {
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t.Fatalf("generated files changed on second build\nfirst:\n%s\nsecond:\n%s", first, second)
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}
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cmd := exec.Command("./bin/hello", "greeter:hello")
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out, err := cmd.CombinedOutput()
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if err != nil {
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t.Fatalf("bin/hello greeter:hello: %v\n%s", err, out)
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}
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if got := strings.TrimSpace(string(out)); got != "hello-app" {
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t.Fatalf("output = %q, want %q", got, "hello-app")
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}
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}
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func runSummerBuild(t *testing.T) string {
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t.Helper()
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cmd := exec.Command("go", "run", "../../cmd/summer", "build")
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cmd.Dir = "."
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out, err := cmd.CombinedOutput()
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if err != nil {
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t.Fatalf("summer build: %v\n%s", err, out)
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}
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return string(out)
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}
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func generatedHash(t *testing.T) [32]byte {
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t.Helper()
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var buf bytes.Buffer
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for _, name := range []string{"main.go", "plugins.gen.go"} {
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body, err := os.ReadFile(name)
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if err != nil {
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t.Fatal(err)
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}
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buf.Write(body)
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}
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return sha256.Sum256(buf.Bytes())
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}
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308
internal/build/build.go
Normal file
308
internal/build/build.go
Normal file
@@ -0,0 +1,308 @@
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package build
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"go/format"
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"io"
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"os"
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"os/exec"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"unicode"
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"github.com/knadh/koanf/parsers/yaml"
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)
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const manifestName = "summer.yaml"
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// Manifest is the ordered app plugin list used to generate imports.
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type Manifest struct {
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Module string
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Binary string
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Plugins []Plugin
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}
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// Plugin is one compiled plugin module in manifest order.
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type Plugin struct {
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ID string
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Module string
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}
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// LoadManifest reads and validates summer.yaml at path.
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func LoadManifest(path string) (Manifest, error) {
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raw, err := os.ReadFile(path)
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if err != nil {
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return Manifest{}, fmt.Errorf("build: read %s: %w", path, err)
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}
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tree, err := yaml.Parser().Unmarshal(raw)
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if err != nil {
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return Manifest{}, fmt.Errorf("build: parse %s: %w", path, err)
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}
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m := Manifest{
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Module: strings.TrimSpace(asString(tree["module"])),
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Binary: strings.TrimSpace(asString(tree["binary"])),
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}
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if err := validateModulePath(m.Module); err != nil {
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return Manifest{}, fmt.Errorf("build: module: %w", err)
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}
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if err := validateBinary(m.Binary); err != nil {
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return Manifest{}, fmt.Errorf("build: binary: %w", err)
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}
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seenID := make(map[string]struct{})
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seenMod := make(map[string]struct{})
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for i, item := range asSlice(tree["plugins"]) {
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entry := asMap(item)
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if entry == nil {
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return Manifest{}, fmt.Errorf("build: plugins[%d] must be a mapping with id and module", i)
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}
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p := Plugin{
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ID: strings.TrimSpace(asString(entry["id"])),
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Module: strings.TrimSpace(asString(entry["module"])),
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}
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if p.ID == "" {
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return Manifest{}, fmt.Errorf("build: plugins[%d] is missing id", i)
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}
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if strings.ContainsAny(p.ID, " \t\r\n\"'`") {
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return Manifest{}, fmt.Errorf("build: plugins[%d] has invalid id %q", i, p.ID)
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}
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if _, dup := seenID[p.ID]; dup {
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return Manifest{}, fmt.Errorf("build: duplicate plugin id %q", p.ID)
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}
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if err := validateModulePath(p.Module); err != nil {
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return Manifest{}, fmt.Errorf("build: plugins[%d] module: %w", i, err)
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}
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if _, dup := seenMod[p.Module]; dup {
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return Manifest{}, fmt.Errorf("build: duplicate plugin module %q", p.Module)
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}
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seenID[p.ID] = struct{}{}
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seenMod[p.Module] = struct{}{}
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m.Plugins = append(m.Plugins, p)
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}
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return m, nil
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}
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// App generates app sources from summer.yaml and runs go build in appDir.
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func App(ctx context.Context, appDir string, out io.Writer) error {
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if appDir == "" {
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return fmt.Errorf("build: app directory is empty")
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}
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if !filepath.IsAbs(appDir) {
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abs, err := filepath.Abs(appDir)
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if err != nil {
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return fmt.Errorf("build: resolve app directory: %w", err)
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}
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appDir = abs
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}
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if out == nil {
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out = os.Stdout
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}
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m, err := LoadManifest(filepath.Join(appDir, manifestName))
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if err != nil {
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return err
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}
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if err := generate(appDir, m); err != nil {
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return err
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}
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binRel := filepath.Join("bin", m.Binary)
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if err := os.MkdirAll(filepath.Join(appDir, "bin"), 0o755); err != nil {
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return fmt.Errorf("build: create bin dir: %w", err)
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}
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cmd := exec.CommandContext(ctx, "go", "build", "-o", binRel, ".")
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cmd.Dir = appDir
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cmd.Stdout = out
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cmd.Stderr = out
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start := time.Now()
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if err := cmd.Run(); err != nil {
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return fmt.Errorf("build: go build: %w", err)
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}
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fmt.Fprintf(out, "built %s in %s\n", m.Binary, time.Since(start).Round(time.Millisecond))
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return nil
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}
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func generate(appDir string, m Manifest) error {
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mainSrc, err := generateMain(m)
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if err != nil {
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return err
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}
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pluginsSrc, err := generatePluginsGen(m)
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if err != nil {
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return err
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}
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if err := writeIfChanged(filepath.Join(appDir, "main.go"), mainSrc); err != nil {
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return err
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}
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if err := writeIfChanged(filepath.Join(appDir, "plugins.gen.go"), pluginsSrc); err != nil {
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return err
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}
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return nil
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}
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func generateMain(m Manifest) ([]byte, error) {
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var b strings.Builder
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b.WriteString("// Code generated by summer build. DO NOT EDIT.\n\n")
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b.WriteString("package main\n\n")
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b.WriteString("import (\n")
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b.WriteString("\t\"fmt\"\n")
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b.WriteString("\t\"io\"\n")
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b.WriteString("\t\"os\"\n\n")
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b.WriteString("\t\"git.golem15.com/golem15/summercms/backpack\"\n")
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b.WriteString("\t\"git.golem15.com/golem15/summercms/bonfire\"\n")
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b.WriteString("\t\"git.golem15.com/golem15/summercms/compass\"\n")
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b.WriteString("\t\"git.golem15.com/golem15/summercms/pact\"\n")
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b.WriteString("\t\"git.golem15.com/golem15/summercms/party\"\n")
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b.WriteString(")\n\n")
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b.WriteString("func main() {\n")
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b.WriteString("\tif err := run(os.Args[1:], os.Stdout); err != nil {\n")
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b.WriteString("\t\tfmt.Fprintln(os.Stderr, err)\n")
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b.WriteString("\t\tos.Exit(1)\n")
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b.WriteString("\t}\n")
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b.WriteString("}\n\n")
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b.WriteString("func run(args []string, out io.Writer) error {\n")
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b.WriteString("\tcfg, err := compass.Load(\"config\")\n")
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b.WriteString("\tif err != nil {\n")
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b.WriteString("\t\treturn err\n")
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b.WriteString("\t}\n")
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b.WriteString("\tapp := backpack.New(cfg)\n")
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b.WriteString("\tplugins, err := party.Activate(app, PluginIDs)\n")
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b.WriteString("\tif err != nil {\n")
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b.WriteString("\t\treturn err\n")
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b.WriteString("\t}\n")
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b.WriteString("\tvar commands []bonfire.Command\n")
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b.WriteString("\tfor _, plugin := range plugins {\n")
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b.WriteString("\t\tif hasCommands, ok := plugin.(pact.HasCommands); ok {\n")
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b.WriteString("\t\t\tcommands = append(commands, hasCommands.Commands()...)\n")
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b.WriteString("\t\t}\n")
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b.WriteString("\t}\n")
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fmt.Fprintf(&b, "\troot := bonfire.NewRoot(%s, commands, out)\n", strconv.Quote(m.Binary))
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b.WriteString("\troot.SetArgs(args)\n")
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b.WriteString("\treturn root.Execute()\n")
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b.WriteString("}\n")
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return formatSource([]byte(b.String()))
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}
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func generatePluginsGen(m Manifest) ([]byte, error) {
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var b strings.Builder
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b.WriteString("// Code generated by summer build. DO NOT EDIT.\n\n")
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b.WriteString("package main\n\n")
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if len(m.Plugins) > 0 {
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b.WriteString("import (\n")
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for _, p := range m.Plugins {
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fmt.Fprintf(&b, "\t_ %s\n", strconv.Quote(p.Module))
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}
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b.WriteString(")\n\n")
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}
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b.WriteString("// PluginIDs is the ordered plugin list from summer.yaml.\n")
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b.WriteString("var PluginIDs = []string{\n")
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for _, p := range m.Plugins {
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fmt.Fprintf(&b, "\t%s,\n", strconv.Quote(p.ID))
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}
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b.WriteString("}\n")
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return formatSource([]byte(b.String()))
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}
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func formatSource(src []byte) ([]byte, error) {
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formatted, err := format.Source(src)
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if err != nil {
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return nil, fmt.Errorf("build: format generated go: %w", err)
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}
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return formatted, nil
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}
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func writeIfChanged(path string, content []byte) error {
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existing, err := os.ReadFile(path)
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if err == nil && bytes.Equal(existing, content) {
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return nil
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}
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if err != nil && !errors.Is(err, os.ErrNotExist) {
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return fmt.Errorf("build: read %s: %w", path, err)
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}
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if err := os.WriteFile(path, content, 0o644); err != nil {
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return fmt.Errorf("build: write %s: %w", path, err)
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}
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return nil
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}
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func validateBinary(name string) error {
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if name == "" {
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return fmt.Errorf("is empty")
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}
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if name != filepath.Base(name) || strings.ContainsRune(name, os.PathSeparator) {
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return fmt.Errorf("%q must be a bare file name", name)
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}
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if name == "." || name == ".." {
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return fmt.Errorf("%q is not a valid binary name", name)
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}
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for _, r := range name {
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if r > unicode.MaxASCII || !(unicode.IsLetter(r) || unicode.IsDigit(r) || r == '.' || r == '_' || r == '-') {
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return fmt.Errorf("%q contains invalid characters", name)
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}
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}
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return nil
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}
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func validateModulePath(path string) error {
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if path == "" {
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return fmt.Errorf("is empty")
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}
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if strings.HasPrefix(path, "-") {
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return fmt.Errorf("%q must not start with -", path)
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}
|
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if strings.ContainsAny(path, " \t\r\n\\\"'`$;&|*?<>()[]{}") {
|
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return fmt.Errorf("%q contains invalid characters", path)
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}
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if filepath.IsAbs(path) || strings.Contains(path, `\`) {
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return fmt.Errorf("%q is not a valid module path", path)
|
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}
|
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for _, seg := range strings.Split(path, "/") {
|
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if seg == "" || seg == "." || seg == ".." {
|
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return fmt.Errorf("%q has an invalid path segment", path)
|
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}
|
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if strings.Contains(seg, "@") {
|
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return fmt.Errorf("%q must not contain a version suffix", path)
|
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}
|
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}
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return nil
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}
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|
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func asString(v any) string {
|
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s, _ := v.(string)
|
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return s
|
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}
|
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|
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func asSlice(v any) []any {
|
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switch s := v.(type) {
|
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case []any:
|
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return s
|
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case nil:
|
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return nil
|
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default:
|
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return nil
|
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}
|
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}
|
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|
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func asMap(v any) map[string]any {
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switch m := v.(type) {
|
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case map[string]any:
|
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return m
|
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case map[any]any:
|
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out := make(map[string]any, len(m))
|
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for k, val := range m {
|
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ks, ok := k.(string)
|
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if !ok {
|
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continue
|
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}
|
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out[ks] = val
|
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}
|
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return out
|
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default:
|
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return nil
|
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}
|
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}
|
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129
internal/build/build_test.go
Normal file
129
internal/build/build_test.go
Normal file
@@ -0,0 +1,129 @@
|
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package build
|
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|
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import (
|
||||
"bytes"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"strings"
|
||||
"testing"
|
||||
)
|
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|
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func TestLoadHelloManifest(t *testing.T) {
|
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m, err := LoadManifest(filepath.Join("..", "..", "examples", "hello", "summer.yaml"))
|
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if err != nil {
|
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t.Fatal(err)
|
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}
|
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if m.Binary != "hello" {
|
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t.Fatalf("binary = %q", m.Binary)
|
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}
|
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if len(m.Plugins) != 2 || m.Plugins[0].ID != "golem15.hello" || m.Plugins[1].ID != "golem15.greeter" {
|
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t.Fatalf("plugins = %+v", m.Plugins)
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}
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}
|
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|
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func TestParseManifestRejectsDuplicatesAndInvalidPaths(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
|
||||
t.Run("duplicate id", func(t *testing.T) {
|
||||
path := filepath.Join(dir, "dup.yaml")
|
||||
write(t, path, "module: example.com/app\nbinary: app\nplugins:\n - id: a.b\n module: example.com/one\n - id: a.b\n module: example.com/two\n")
|
||||
if _, err := LoadManifest(path); err == nil || !strings.Contains(err.Error(), "a.b") {
|
||||
t.Fatalf("want duplicate id error, got %v", err)
|
||||
}
|
||||
})
|
||||
|
||||
t.Run("invalid module", func(t *testing.T) {
|
||||
path := filepath.Join(dir, "bad.yaml")
|
||||
write(t, path, "module: example.com/app\nbinary: app\nplugins:\n - id: a.b\n module: \"example.com/one; rm -rf /\"\n")
|
||||
if _, err := LoadManifest(path); err == nil {
|
||||
t.Fatal("want invalid module error")
|
||||
}
|
||||
})
|
||||
|
||||
t.Run("path traversal module", func(t *testing.T) {
|
||||
path := filepath.Join(dir, "dotdot.yaml")
|
||||
write(t, path, "module: example.com/app\nbinary: app\nplugins:\n - id: a.b\n module: example.com/../evil\n")
|
||||
if _, err := LoadManifest(path); err == nil {
|
||||
t.Fatal("want invalid module error")
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
func TestGenerateStableQuotedImportsInManifestOrder(t *testing.T) {
|
||||
m := Manifest{
|
||||
Module: "example.com/app",
|
||||
Binary: "hello",
|
||||
Plugins: []Plugin{
|
||||
{ID: "golem15.hello", Module: "example.com/app/plugins/base"},
|
||||
{ID: "golem15.greeter", Module: "example.com/app/plugins/greeter"},
|
||||
},
|
||||
}
|
||||
first, err := generatePluginsGen(m)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
second, err := generatePluginsGen(m)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if !bytes.Equal(first, second) {
|
||||
t.Fatal("generated plugins.gen.go is not byte-stable")
|
||||
}
|
||||
src := string(first)
|
||||
baseAt := strings.Index(src, `example.com/app/plugins/base`)
|
||||
greeterAt := strings.Index(src, `example.com/app/plugins/greeter`)
|
||||
if baseAt < 0 || greeterAt < 0 || baseAt > greeterAt {
|
||||
t.Fatalf("imports not in manifest order:\n%s", src)
|
||||
}
|
||||
if !strings.Contains(src, "\t_ \"example.com/app/plugins/base\"") {
|
||||
t.Fatalf("import is not Go-quoted:\n%s", src)
|
||||
}
|
||||
|
||||
mainSrc, err := generateMain(m)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
again, err := generateMain(m)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if !bytes.Equal(mainSrc, again) {
|
||||
t.Fatal("generated main.go is not byte-stable")
|
||||
}
|
||||
if !bytes.Contains(mainSrc, []byte(`bonfire.NewRoot("hello"`)) {
|
||||
t.Fatalf("main does not use manifest binary:\n%s", mainSrc)
|
||||
}
|
||||
if bytes.Contains(mainSrc, []byte("examples/hello")) {
|
||||
t.Fatal("generated main hard-codes examples/hello")
|
||||
}
|
||||
}
|
||||
|
||||
func TestWriteIfChangedSkipsIdenticalBytes(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
path := filepath.Join(dir, "out.go")
|
||||
content := []byte("package main\n")
|
||||
if err := writeIfChanged(path, content); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
info, err := os.Stat(path)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := writeIfChanged(path, content); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
again, err := os.Stat(path)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if !info.ModTime().Equal(again.ModTime()) {
|
||||
t.Fatal("identical content rewrote the file")
|
||||
}
|
||||
}
|
||||
|
||||
func write(t *testing.T, path, body string) {
|
||||
t.Helper()
|
||||
if err := os.WriteFile(path, []byte(body), 0o644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user