feat:chain:splitstore chain prune (#9056)

* Splitstore chain prune
* Protect on reification for simpler logic and sound cold compact protect
* Recovery from checkpoint during chain prune
* Splitstore (discard and universal mode) running in itests
* Add pause and restart functions to itest block miner
* Add config options to itest full nodes
* Add FsRepo support for itest full ndoes

Co-authored-by: zenground0 <ZenGround0@users.noreply.github.com>

node/impl/full/chain.go

@@ -653,3 +653,14 @@ func (a *ChainAPI) ChainBlockstoreInfo(ctx context.Context) (map[string]interfac
 
 	return info.Info(), nil
 }
+
+func (a *ChainAPI) ChainPrune(ctx context.Context, opts api.PruneOpts) error {
+	pruner, ok := a.BaseBlockstore.(interface {
+		PruneChain(opts api.PruneOpts) error
+	})
+	if !ok {
+		return xerrors.Errorf("base blockstore does not support pruning (%T)", a.BaseBlockstore)
+	}
+
+	return pruner.PruneChain(opts)
+}

node/repo/memrepo.go

@@ -271,7 +271,11 @@ func (lmem *lockedMemRepo) Blockstore(ctx context.Context, domain BlockstoreDoma
 }
 
 func (lmem *lockedMemRepo) SplitstorePath() (string, error) {
-	return ioutil.TempDir("", "splitstore.*")
+	splitstorePath := filepath.Join(lmem.Path(), "splitstore")
+	if err := os.MkdirAll(splitstorePath, 0755); err != nil {
+		return "", err
+	}
+	return splitstorePath, nil
 }
 
 func (lmem *lockedMemRepo) ListDatastores(ns string) ([]int64, error) {