fixes

pkg/vcs/module.go

@@ -0,0 +1,252 @@
+package vcs
+
+import (
+	"archive/zip"
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/rs/zerolog/log"
+)
+
+// ModuleBuilder builds Go module artifacts from source
+type ModuleBuilder struct{}
+
+// NewModuleBuilder creates a new module builder
+func NewModuleBuilder() *ModuleBuilder {
+	return &ModuleBuilder{}
+}
+
+// ModuleInfo represents Go module version metadata (.info file)
+type ModuleInfo struct {
+	Version string    `json:"Version"`
+	Time    time.Time `json:"Time"`
+}
+
+// BuildModuleZip creates a Go module zip from source directory
+// Follows the Go module zip format specification: https://go.dev/ref/mod#zip-files
+func (b *ModuleBuilder) BuildModuleZip(ctx context.Context, srcPath, modulePath, version string) (io.ReadCloser, error) {
+	log.Debug().
+		Str("src_path", srcPath).
+		Str("module", modulePath).
+		Str("version", version).
+		Msg("Building module zip")
+
+	// Create in-memory zip
+	var buf bytes.Buffer
+	zipWriter := zip.NewWriter(&buf)
+
+	// Collect all files to include in zip
+	files, err := b.collectFiles(srcPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to collect files: %w", err)
+	}
+
+	// Sort files for deterministic zip
+	sort.Strings(files)
+
+	// Add files to zip with proper prefix
+	prefix := fmt.Sprintf("%s@%s/", modulePath, version)
+	for _, relPath := range files {
+		if err := b.addFileToZip(zipWriter, srcPath, relPath, prefix); err != nil {
+			zipWriter.Close()
+			return nil, fmt.Errorf("failed to add file %s: %w", relPath, err)
+		}
+	}
+
+	if err := zipWriter.Close(); err != nil {
+		return nil, fmt.Errorf("failed to close zip writer: %w", err)
+	}
+
+	log.Debug().
+		Str("module", modulePath).
+		Str("version", version).
+		Int("files", len(files)).
+		Int("size", buf.Len()).
+		Msg("Successfully built module zip")
+
+	return io.NopCloser(bytes.NewReader(buf.Bytes())), nil
+}
+
+// collectFiles walks the source directory and collects files to include
+func (b *ModuleBuilder) collectFiles(srcPath string) ([]string, error) {
+	var files []string
+
+	err := filepath.Walk(srcPath, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		// Skip directories
+		if info.IsDir() {
+			// Skip .git directory
+			if info.Name() == ".git" {
+				return filepath.SkipDir
+			}
+			// Skip vendor directory (per Go module zip spec)
+			if info.Name() == "vendor" {
+				return filepath.SkipDir
+			}
+			return nil
+		}
+
+		// Get relative path
+		relPath, err := filepath.Rel(srcPath, path)
+		if err != nil {
+			return err
+		}
+
+		// Skip hidden files (except .gitignore, etc. if needed)
+		if strings.HasPrefix(filepath.Base(relPath), ".") && relPath != ".gitignore" {
+			return nil
+		}
+
+		// Include file
+		files = append(files, relPath)
+		return nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return files, nil
+}
+
+// addFileToZip adds a single file to the zip archive
+func (b *ModuleBuilder) addFileToZip(zipWriter *zip.Writer, srcPath, relPath, prefix string) error {
+	// Create zip header
+	header := &zip.FileHeader{
+		Name:   prefix + filepath.ToSlash(relPath),
+		Method: zip.Deflate,
+	}
+
+	// Get file info for permissions
+	fullPath := filepath.Join(srcPath, relPath)
+	info, err := os.Stat(fullPath)
+	if err != nil {
+		return err
+	}
+
+	// Set modification time to a fixed value for deterministic zips
+	// Go uses the timestamp from the version info
+	header.Modified = time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)
+	header.SetMode(info.Mode())
+
+	// Create file in zip
+	writer, err := zipWriter.CreateHeader(header)
+	if err != nil {
+		return err
+	}
+
+	// Copy file contents
+	file, err := os.Open(fullPath)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	if _, err := io.Copy(writer, file); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// GenerateModInfo creates .info file (JSON metadata)
+func (b *ModuleBuilder) GenerateModInfo(ctx context.Context, srcPath, version string) ([]byte, error) {
+	// Get commit timestamp from git
+	timestamp, err := b.getGitCommitTime(srcPath)
+	if err != nil {
+		// Fallback to current time if git info not available
+		log.Warn().Err(err).Msg("Failed to get git commit time, using current time")
+		timestamp = time.Now()
+	}
+
+	info := ModuleInfo{
+		Version: version,
+		Time:    timestamp,
+	}
+
+	data, err := json.Marshal(info)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal module info: %w", err)
+	}
+
+	return data, nil
+}
+
+// getGitCommitTime retrieves the commit timestamp from git
+func (b *ModuleBuilder) getGitCommitTime(repoPath string) (time.Time, error) {
+	cmd := exec.Command("git", "log", "-1", "--format=%cI")
+	cmd.Dir = repoPath
+
+	output, err := cmd.Output()
+	if err != nil {
+		return time.Time{}, err
+	}
+
+	// Parse ISO 8601 timestamp
+	timestamp, err := time.Parse(time.RFC3339, strings.TrimSpace(string(output)))
+	if err != nil {
+		return time.Time{}, err
+	}
+
+	return timestamp, nil
+}
+
+// ExtractGoMod extracts go.mod content
+func (b *ModuleBuilder) ExtractGoMod(ctx context.Context, srcPath string) ([]byte, error) {
+	goModPath := filepath.Join(srcPath, "go.mod")
+
+	data, err := os.ReadFile(goModPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read go.mod: %w", err)
+	}
+
+	// Validate go.mod (basic check)
+	if !strings.Contains(string(data), "module ") {
+		return nil, fmt.Errorf("invalid go.mod: missing module directive")
+	}
+
+	return data, nil
+}
+
+// ValidateModule performs basic validation on the module
+func (b *ModuleBuilder) ValidateModule(ctx context.Context, srcPath, expectedModulePath string) error {
+	// Read go.mod
+	goModData, err := b.ExtractGoMod(ctx, srcPath)
+	if err != nil {
+		return err
+	}
+
+	// Extract module path from go.mod
+	lines := strings.Split(string(goModData), "\n")
+	var declaredModulePath string
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		if strings.HasPrefix(line, "module ") {
+			declaredModulePath = strings.TrimSpace(strings.TrimPrefix(line, "module "))
+			break
+		}
+	}
+
+	if declaredModulePath == "" {
+		return fmt.Errorf("go.mod missing module declaration")
+	}
+
+	// Check if module path matches (allow version suffixes)
+	if !strings.HasPrefix(expectedModulePath, declaredModulePath) {
+		return fmt.Errorf("module path mismatch: expected %s, got %s", expectedModulePath, declaredModulePath)
+	}
+
+	return nil
+}