Initial commit

backend/internal/builder/builder.go

@@ -0,0 +1,138 @@
+package builder
+
+import (
+	"fmt"
+	"io"
+	"net/url"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+type Builder struct{}
+
+func NewBuilder() *Builder {
+	return &Builder{}
+}
+
+func (b *Builder) Build(repoURL, appName, gitToken, buildCmd, startCmd, installCmd, runtime string, envVars map[string]string, logWriter io.Writer) (string, error) {
+	workDir := filepath.Join("/tmp", "paas-builds", appName)
+	if err := os.RemoveAll(workDir); err != nil {
+		return "", fmt.Errorf("failed to clean work dir: %w", err)
+	}
+	if err := os.MkdirAll(workDir, 0755); err != nil {
+		return "", fmt.Errorf("failed to create work dir: %w", err)
+	}
+
+	cloneURL := repoURL
+	if gitToken != "" {
+		u, err := url.Parse(repoURL)
+		if err != nil {
+			return "", fmt.Errorf("invalid repo url: %w", err)
+		}
+		u.User = url.UserPassword("oauth2", gitToken)
+		cloneURL = u.String()
+	}
+
+	fmt.Fprintf(logWriter, ">>> Cloning repository %s...\n", repoURL)
+	cloneCmd := exec.Command("git", "clone", "--depth", "1", cloneURL, ".")
+	cloneCmd.Dir = workDir
+	cloneCmd.Stdout = logWriter
+	cloneCmd.Stderr = logWriter
+	if err := cloneCmd.Run(); err != nil {
+		return "", fmt.Errorf("git clone failed: %w", err)
+	}
+
+	if runtime == "" {
+		runtime = "nodejs"
+	}
+
+	var nixPkgs string
+	var defaultInstall, defaultBuild, defaultStart string
+
+	switch runtime {
+	case "bun":
+		nixPkgs = `["bun"]`
+		defaultInstall = "bun install"
+		defaultBuild = "bun run build"
+		defaultStart = "bun run start"
+	case "deno":
+		nixPkgs = `["deno"]`
+		defaultInstall = "deno cache"
+		defaultBuild = "deno task build"
+		defaultStart = "deno task start"
+	case "pnpm":
+		nixPkgs = `["nodejs_20", "pnpm"]`
+		defaultInstall = "pnpm install"
+		defaultBuild = "pnpm run build"
+		defaultStart = "pnpm run start"
+	default:
+		nixPkgs = `["nodejs_20"]`
+		defaultInstall = "npm ci --legacy-peer-deps || npm install --legacy-peer-deps"
+		defaultBuild = "npm run build"
+		defaultStart = "npm run start"
+	}
+
+	installStr := defaultInstall
+	if installCmd != "" {
+		installStr = installCmd
+	}
+
+	buildStr := defaultBuild
+	if buildCmd != "" {
+		buildStr = buildCmd
+	}
+
+	startStr := defaultStart
+	if startCmd != "" {
+		startStr = startCmd
+	}
+
+	nixpacksConfig := fmt.Sprintf(`
+[phases.setup]
+nixPkgs = %s
+
+[phases.install]
+cmds = ["%s"]
+
+[phases.build]
+cmds = ["%s"]
+
+[start]
+cmd = "%s"
+`, nixPkgs, installStr, buildStr, startStr)
+
+	if _, err := os.Stat(filepath.Join(workDir, "package.json")); err == nil {
+		configPath := filepath.Join(workDir, "nixpacks.toml")
+		if err := os.WriteFile(configPath, []byte(nixpacksConfig), 0644); err != nil {
+			return "", fmt.Errorf("failed to write nixpacks.toml: %w", err)
+		}
+	}
+
+	imageName := strings.ToLower(appName)
+
+	fmt.Fprintf(logWriter, "\n>>> Starting Nixpacks build for %s...\n", imageName)
+
+	args := []string{"build", ".", "--name", imageName, "--no-cache"}
+	for k, v := range envVars {
+		args = append(args, "--env", fmt.Sprintf("%s=%s", k, v))
+	}
+
+	nixCmd := exec.Command("nixpacks", args...)
+	nixCmd.Dir = workDir
+	nixCmd.Stdout = logWriter
+	nixCmd.Stderr = logWriter
+
+	nixCmd.Env = append(os.Environ(),
+		"NIXPACKS_NO_CACHE=1",
+	)
+
+	if err := nixCmd.Run(); err != nil {
+		return "", fmt.Errorf("nixpacks build failed: %w", err)
+	}
+
+	fmt.Fprintf(logWriter, "\n>>> Build successful!\n")
+
+	return imageName, nil
+}