|
| 1 | +package worker |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "fmt" |
| 6 | + "os" |
| 7 | + "os/exec" |
| 8 | + "path/filepath" |
| 9 | + "strings" |
| 10 | + |
| 11 | + "github.com/joho/godotenv" |
| 12 | + "github.com/warpdotdev/oz-agent-worker/internal/log" |
| 13 | +) |
| 14 | + |
| 15 | +const defaultWorkspaceRoot = "/var/lib/oz/workspaces" |
| 16 | + |
| 17 | +// defaultInheritedEnvVars are the host environment variables passed through to |
| 18 | +// tasks and scripts by default. Sensitive worker credentials are intentionally |
| 19 | +// excluded; additional variables can be opted in via the backend config. |
| 20 | +var defaultInheritedEnvVars = []string{"HOME", "TMPDIR", "PATH"} |
| 21 | + |
| 22 | +// hostBaseEnv builds a minimal env slice from the host, containing only the |
| 23 | +// keys listed in defaultInheritedEnvVars. |
| 24 | +func hostBaseEnv() []string { |
| 25 | + var base []string |
| 26 | + for _, key := range defaultInheritedEnvVars { |
| 27 | + if val, ok := os.LookupEnv(key); ok { |
| 28 | + base = append(base, fmt.Sprintf("%s=%s", key, val)) |
| 29 | + } |
| 30 | + } |
| 31 | + return base |
| 32 | +} |
| 33 | + |
| 34 | +// DirectBackendConfig holds configuration specific to the direct (non-containerized) backend. |
| 35 | +type DirectBackendConfig struct { |
| 36 | + WorkspaceRoot string |
| 37 | + OzPath string // Path to the oz CLI binary. If empty, looks up "oz" in PATH. |
| 38 | + SetupCommand string |
| 39 | + TeardownCommand string |
| 40 | + NoCleanup bool |
| 41 | + Env map[string]string |
| 42 | +} |
| 43 | + |
| 44 | +// DirectBackend executes tasks directly on the host without Docker. |
| 45 | +type DirectBackend struct { |
| 46 | + config DirectBackendConfig |
| 47 | + ozPath string // resolved path to the oz CLI |
| 48 | +} |
| 49 | + |
| 50 | +// NewDirectBackend creates a new direct backend, verifying the oz CLI is available. |
| 51 | +func NewDirectBackend(ctx context.Context, config DirectBackendConfig) (*DirectBackend, error) { |
| 52 | + ozPath := config.OzPath |
| 53 | + if ozPath == "" { |
| 54 | + var err error |
| 55 | + ozPath, err = exec.LookPath("oz") |
| 56 | + if err != nil { |
| 57 | + return nil, fmt.Errorf("oz CLI not found in PATH: %w", err) |
| 58 | + } |
| 59 | + } |
| 60 | + log.Infof(ctx, "Using oz CLI at: %s", ozPath) |
| 61 | + |
| 62 | + if config.WorkspaceRoot == "" { |
| 63 | + config.WorkspaceRoot = defaultWorkspaceRoot |
| 64 | + } |
| 65 | + |
| 66 | + // Ensure workspace root exists. |
| 67 | + if err := os.MkdirAll(config.WorkspaceRoot, 0755); err != nil { |
| 68 | + return nil, fmt.Errorf("failed to create workspace root %s: %w", config.WorkspaceRoot, err) |
| 69 | + } |
| 70 | + |
| 71 | + return &DirectBackend{ |
| 72 | + config: config, |
| 73 | + ozPath: ozPath, |
| 74 | + }, nil |
| 75 | +} |
| 76 | + |
| 77 | +// ExecuteTask runs the agent directly on the host. |
| 78 | +func (b *DirectBackend) ExecuteTask(ctx context.Context, params *TaskParams) error { |
| 79 | + taskID := params.TaskID |
| 80 | + |
| 81 | + // 1. Create per-task workspace directory. |
| 82 | + workspaceDir := filepath.Join(b.config.WorkspaceRoot, taskID) |
| 83 | + if err := os.MkdirAll(workspaceDir, 0755); err != nil { |
| 84 | + return fmt.Errorf("failed to create workspace directory: %w", err) |
| 85 | + } |
| 86 | + log.Infof(ctx, "Created workspace: %s", workspaceDir) |
| 87 | + |
| 88 | + defer func() { |
| 89 | + if b.config.NoCleanup { |
| 90 | + log.Infof(ctx, "Skipping cleanup for workspace: %s", workspaceDir) |
| 91 | + return |
| 92 | + } |
| 93 | + b.cleanup(ctx, taskID, workspaceDir) |
| 94 | + }() |
| 95 | + |
| 96 | + // 2. Create temp environment file for setup script to write to. |
| 97 | + envFile, err := os.CreateTemp(workspaceDir, "oz-env-*") |
| 98 | + if err != nil { |
| 99 | + return fmt.Errorf("failed to create environment file: %w", err) |
| 100 | + } |
| 101 | + envFilePath := envFile.Name() |
| 102 | + if err := envFile.Close(); err != nil { |
| 103 | + return fmt.Errorf("failed to close environment file: %w", err) |
| 104 | + } |
| 105 | + |
| 106 | + // 3. Build environment variables: common + config-level. |
| 107 | + envVars := make([]string, len(params.EnvVars)) |
| 108 | + copy(envVars, params.EnvVars) |
| 109 | + for key, value := range b.config.Env { |
| 110 | + envVars = append(envVars, fmt.Sprintf("%s=%s", key, value)) |
| 111 | + } |
| 112 | + |
| 113 | + // 4. Run setup command if configured. |
| 114 | + if b.config.SetupCommand != "" { |
| 115 | + setupEnv := append(envVars, |
| 116 | + fmt.Sprintf("OZ_WORKSPACE_ROOT=%s", workspaceDir), |
| 117 | + "OZ_WORKER_BACKEND=direct", |
| 118 | + fmt.Sprintf("OZ_RUN_ID=%s", taskID), |
| 119 | + fmt.Sprintf("OZ_ENVIRONMENT_FILE=%s", envFilePath), |
| 120 | + ) |
| 121 | + |
| 122 | + log.Infof(ctx, "Running setup command: %s", b.config.SetupCommand) |
| 123 | + if err := b.runCommand(ctx, b.config.SetupCommand, workspaceDir, setupEnv); err != nil { |
| 124 | + return fmt.Errorf("setup command failed: %w", err) |
| 125 | + } |
| 126 | + } |
| 127 | + |
| 128 | + // 5. Parse environment file for KEY=VALUE pairs written by setup script. |
| 129 | + // Use merge semantics so setup script vars can override YAML config vars. |
| 130 | + setupScriptEnv, err := parseEnvFile(envFilePath) |
| 131 | + if err != nil { |
| 132 | + log.Warnf(ctx, "Failed to parse environment file: %v", err) |
| 133 | + } |
| 134 | + var setupScriptVars []string |
| 135 | + for key, value := range setupScriptEnv { |
| 136 | + setupScriptVars = append(setupScriptVars, fmt.Sprintf("%s=%s", key, value)) |
| 137 | + } |
| 138 | + envVars = mergeEnvVars(envVars, setupScriptVars) |
| 139 | + |
| 140 | + // 6. Invoke oz CLI with base args. |
| 141 | + // Start from a minimal host base (HOME, TMPDIR, PATH) and overlay task env vars, |
| 142 | + // so sensitive worker credentials are never exposed to tasks. |
| 143 | + cmd := exec.CommandContext(ctx, b.ozPath, params.BaseArgs...) |
| 144 | + cmd.Dir = workspaceDir |
| 145 | + cmd.Env = mergeEnvVars(hostBaseEnv(), envVars) |
| 146 | + cmd.Stdout = os.Stdout |
| 147 | + cmd.Stderr = os.Stderr |
| 148 | + |
| 149 | + log.Infof(ctx, "Running oz agent in workspace %s", workspaceDir) |
| 150 | + log.Debugf(ctx, "Command: %s %s", b.ozPath, strings.Join(params.BaseArgs, " ")) |
| 151 | + |
| 152 | + if err := cmd.Run(); err != nil { |
| 153 | + return fmt.Errorf("oz agent exited with error: %w", err) |
| 154 | + } |
| 155 | + |
| 156 | + log.Infof(ctx, "Task %s execution completed successfully", taskID) |
| 157 | + return nil |
| 158 | +} |
| 159 | + |
| 160 | +// Shutdown cleans up any workspace directories left behind under the workspace root. |
| 161 | +func (b *DirectBackend) Shutdown(ctx context.Context) { |
| 162 | + entries, err := os.ReadDir(b.config.WorkspaceRoot) |
| 163 | + if err != nil { |
| 164 | + if !os.IsNotExist(err) { |
| 165 | + log.Warnf(ctx, "Failed to read workspace root %s during shutdown: %v", b.config.WorkspaceRoot, err) |
| 166 | + } |
| 167 | + return |
| 168 | + } |
| 169 | + for _, entry := range entries { |
| 170 | + path := filepath.Join(b.config.WorkspaceRoot, entry.Name()) |
| 171 | + if err := os.RemoveAll(path); err != nil { |
| 172 | + log.Warnf(ctx, "Failed to remove workspace %s during shutdown: %v", path, err) |
| 173 | + } else { |
| 174 | + log.Infof(ctx, "Removed lingering workspace on shutdown: %s", path) |
| 175 | + } |
| 176 | + } |
| 177 | +} |
| 178 | + |
| 179 | +// cleanup runs the teardown command (if configured) and removes the workspace directory. |
| 180 | +func (b *DirectBackend) cleanup(ctx context.Context, taskID, workspaceDir string) { |
| 181 | + if b.config.TeardownCommand != "" { |
| 182 | + teardownEnv := []string{ |
| 183 | + fmt.Sprintf("OZ_WORKSPACE_ROOT=%s", workspaceDir), |
| 184 | + "OZ_WORKER_BACKEND=direct", |
| 185 | + fmt.Sprintf("OZ_RUN_ID=%s", taskID), |
| 186 | + } |
| 187 | + |
| 188 | + log.Infof(ctx, "Running teardown command: %s", b.config.TeardownCommand) |
| 189 | + if err := b.runCommand(ctx, b.config.TeardownCommand, workspaceDir, teardownEnv); err != nil { |
| 190 | + log.Warnf(ctx, "Teardown command failed: %v", err) |
| 191 | + } |
| 192 | + } |
| 193 | + |
| 194 | + log.Infof(ctx, "Removing workspace: %s", workspaceDir) |
| 195 | + if err := os.RemoveAll(workspaceDir); err != nil { |
| 196 | + log.Warnf(ctx, "Failed to remove workspace %s: %v", workspaceDir, err) |
| 197 | + } |
| 198 | +} |
| 199 | + |
| 200 | +// runCommand executes a shell command with the given working directory and environment. |
| 201 | +// The command inherits only standard host vars (HOME, TMPDIR, PATH) plus env. |
| 202 | +func (b *DirectBackend) runCommand(ctx context.Context, command, dir string, env []string) error { |
| 203 | + cmd := exec.CommandContext(ctx, "/bin/sh", "-c", command) |
| 204 | + cmd.Dir = dir |
| 205 | + cmd.Env = mergeEnvVars(hostBaseEnv(), env) |
| 206 | + cmd.Stdout = os.Stdout |
| 207 | + cmd.Stderr = os.Stderr |
| 208 | + return cmd.Run() |
| 209 | +} |
| 210 | + |
| 211 | +// mergeEnvVars merges base and override env var slices (KEY=VALUE format). |
| 212 | +// Override entries take precedence over base entries with the same key. |
| 213 | +func mergeEnvVars(base, override []string) []string { |
| 214 | + envMap := make(map[string]string, len(base)+len(override)) |
| 215 | + var keys []string |
| 216 | + |
| 217 | + for _, entry := range base { |
| 218 | + key, _, _ := strings.Cut(entry, "=") |
| 219 | + if _, exists := envMap[key]; !exists { |
| 220 | + keys = append(keys, key) |
| 221 | + } |
| 222 | + envMap[key] = entry |
| 223 | + } |
| 224 | + |
| 225 | + for _, entry := range override { |
| 226 | + key, _, _ := strings.Cut(entry, "=") |
| 227 | + if _, exists := envMap[key]; !exists { |
| 228 | + keys = append(keys, key) |
| 229 | + } |
| 230 | + envMap[key] = entry |
| 231 | + } |
| 232 | + |
| 233 | + result := make([]string, 0, len(keys)) |
| 234 | + for _, key := range keys { |
| 235 | + result = append(result, envMap[key]) |
| 236 | + } |
| 237 | + return result |
| 238 | +} |
| 239 | + |
| 240 | +// parseEnvFile reads a dotenv-format file and returns a map of KEY=VALUE pairs. |
| 241 | +// It supports quoted values, comments, and other standard dotenv syntax via godotenv. |
| 242 | +func parseEnvFile(path string) (map[string]string, error) { |
| 243 | + return godotenv.Read(path) |
| 244 | +} |
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