provide an option to disable loading of built-in assets.

build/bootstrap.go

@@ -13,6 +13,10 @@ import (
 )
 
 func BuiltinBootstrap() ([]peer.AddrInfo, error) {
+	if DisableBuiltinAssets {
+		return nil, nil
+	}
+
 	var out []peer.AddrInfo
 
 	b := rice.MustFindBox("bootstrap")

build/flags.go

@@ -0,0 +1,15 @@
+package build
+
+// DisableBuiltinAssets disables the resolution of go.rice boxes that store
+// built-in assets, such as proof parameters, bootstrap peers, genesis blocks,
+// etc.
+//
+// When this value is set to true, it is expected that the user will
+// provide any such configurations through the Lotus API itself.
+//
+// This is useful when you're using Lotus as a library, such as to orchestrate
+// test scenarios, or for other purposes where you don't need to use the
+// defaults shipped with the binary.
+//
+// For this flag to be effective, it must be enabled _before_ instantiating Lotus.
+var DisableBuiltinAssets = false

node/modules/storageminer.go

@@ -75,6 +75,12 @@ func GetParams(sbc *ffiwrapper.Config) error {
 		return err
 	}
 
+	// If built-in assets are disabled, we expect the user to have placed the right
+	// parameters in the right location on the filesystem (/var/tmp/filecoin-proof-parameters).
+	if build.DisableBuiltinAssets {
+		return nil
+	}
+
 	if err := paramfetch.GetParams(context.TODO(), build.ParametersJSON(), uint64(ssize)); err != nil {
 		return xerrors.Errorf("fetching proof parameters: %w", err)
 	}