allows extensions (#126)

.vscode/launch.json

@@ -44,8 +44,10 @@
         "0",
         "--role",
         "worker",
-        "--runtime",
+        "--runtime-path",
         "/tmp/runtime",
+        "--runtime-cli",
+        "bls-runtime",
         "--workspace",
         "/tmp/debug/worker",
         "--private-key",

executor/command.go

@@ -20,6 +20,7 @@ func (e *Executor) createCmd(paths requestPaths, req execute.Request) *exec.Cmd
 	cfg := req.Config.Runtime
 	cfg.Input = paths.input
 	cfg.FSRoot = paths.fsRoot
+	cfg.DriversRootPath = e.cfg.DriversRootPath
 
 	// Prepare CLI arguments.
 	// Append the input argument first first.

executor/config.go

@@ -13,13 +13,15 @@ var defaultConfig = Config{
 	ExecutableName: blockless.RuntimeCLI(),
 	FS:             afero.NewOsFs(),
 	Limiter:        &noopLimiter{},
+	DriversRootPath: "",
 }
 
 // Config represents the Executor configuration.
 type Config struct {
 	WorkDir        string   // directory where files needed for the execution are stored
 	RuntimeDir     string   // directory where the executable can be found
 	ExecutableName string   // name for the executable
+	DriversRootPath string // where are cgi drivers stored
 	FS             afero.Fs // FS accessor
 	Limiter        Limiter  // Resource limiter for executed processes
 }

executor/executor.go

@@ -39,6 +39,9 @@ func New(log zerolog.Logger, options ...Option) (*Executor, error) {
 	}
 	cfg.RuntimeDir = runtime
 
+	// todo: fix for windows
+	cfg.DriversRootPath = cfg.RuntimeDir + "/extensions"
+
 	// Verify the runtime path is valid.
 	cliPath := filepath.Join(cfg.RuntimeDir, cfg.ExecutableName)
 	_, err = cfg.FS.Stat(cliPath)

executor/runtime_flags.go

@@ -29,6 +29,10 @@ func runtimeFlags(cfg execute.BLSRuntimeConfig, permissions []string) []string {
 		flags = append(flags, "--"+execute.BLSRuntimeFlagFSRoot, cfg.FSRoot)
 	}
 
+	if cfg.DriversRootPath != "" {
+		flags = append(flags, "--"+execute.BLSRuntimeFlagDrivers, cfg.DriversRootPath)
+	}
+
 	if cfg.Fuel > 0 {
 		flags = append(flags, "--"+execute.BLSRuntimeFlagFuel, fmt.Sprint(cfg.Fuel))
 	}

models/execute/runtime.go

@@ -12,6 +12,7 @@ type BLSRuntimeConfig struct {
 	Fuel          uint64 `json:"limited_fuel,omitempty"`
 	Memory        uint64 `json:"limited_memory,omitempty"`
 	Logger        string `json:"runtime_logger,omitempty"`
+	DriversRootPath string `json:"drivers_root_path,omitempty"`
 	// Fields not allowed to be set in the request.
 	Input  string `json:"-"`
 	FSRoot string `json:"-"`
@@ -28,4 +29,5 @@ const (
 	BLSRuntimeFlagLogger        = "runtime-logger"
 	BLSRuntimeFlagPermission    = "permission"
 	BLSRuntimeFlagEnv           = "env"
+	BLSRuntimeFlagDrivers 		= "drivers-root-path"
 )