[NOD-4] Exit on out of disk space when storing a block (#211)

* [NOD-4] Exit on out of disk space when storing a block

* [NOD-4] Fixed log message

* [NOD-4] Fixed log message

* [NOD-4] Fixed log message

config/config.go

@@ -764,7 +764,7 @@ func loadConfig() (*Config, []string, error) {
 	}
 
 	// Check that 'generate' and 'subnetwork' flags do not conflict
-	if cfg.Generate && cfg.SubnetworkID.IsEqual(subnetworkid.SubnetworkIDSupportsAll) {
+	if cfg.Generate && !cfg.SubnetworkID.IsEqual(subnetworkid.SubnetworkIDSupportsAll) {
 		str := "%s: both generate flag and subnetwork filtering are set "
 		err := fmt.Errorf(str, funcName)
 		fmt.Fprintln(os.Stderr, err)

database/ffldb/blockio.go

@@ -16,6 +16,7 @@ import (
 	"os"
 	"path/filepath"
 	"sync"
+	"syscall"
 
 	"github.com/daglabs/btcd/dagconfig/daghash"
 	"github.com/daglabs/btcd/database"
@@ -385,6 +386,10 @@ func (s *blockStore) writeData(data []byte, fieldName string) error {
 	n, err := wc.curFile.file.WriteAt(data, int64(wc.curOffset))
 	wc.curOffset += uint32(n)
 	if err != nil {
+		if pathErr, isOk := err.(*os.PathError); isOk && pathErr.Err == syscall.ENOSPC {
+			log.Errorf("No space left on the hard disk, exiting...")
+			os.Exit(1)
+		}
 		str := fmt.Sprintf("failed to write %s to file %d at "+
 			"offset %d: %s", fieldName, wc.curFileNum,
 			wc.curOffset-uint32(n), err)

mining/cpuminer/cpuminer.go

@@ -436,7 +436,7 @@ func (m *CPUMiner) Start() {
 	go m.miningWorkerController()
 
 	m.started = true
-	log.Infof("CPU miner started")
+	log.Infof("CPU miner started, number of workers %d", m.numWorkers)
 }
 
 // Stop gracefully stops the mining process by signalling all workers, and the